作者： Zhou, Nan;Liu, Longhai;Zhou, Zhipeng;Zhang, Ye;Li, Minghui;...

期刊： Journal of the American Ceramic Society,2020年103(3):1798-1808 ISSN：0002-7820

通讯作者： Xia, Mao;Zhou, Zhi

作者机构： [Xia, Mao; Zhou, Cheng; Zhou, Zhipeng; Zhang, Ye; Zhou, Nan; Zhou, Zhi; Liu, Longhai; Xia, M; Li, Minghui] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhou, Nan; Zhou, Zhi; Liu, Longhai] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.

通讯机构： [Xia, M; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： cation vacancies;charge compensation;defects;LED plant lighting;phosphors

摘要： <jats:title>Abstract</jats:title><jats:p>In the recent years, Mn<jats:sup>4+</jats:sup>‐doped phosphors for indoor plant cultivation have received extensive concern owing to the far‐red emission that can match well with the absorption spectra of plant pigments. Whereas, many Mn<jats:sup>4+</jats:sup>‐doped phosphors still face some challenges such as poor light efficiency and low thermal stability. It is an effective way to resolve these problems via cation vacancies engineering. Herein, the Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphors are successfully synthesized by combustion method. The luminescence intensity of Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphor is enhanced through engineering Ca<jats:sup>2+</jats:sup> and Zn<jats:sup>2+</jats:sup> vacancies according to the charge compensation mechanism. The optimal content of each Ca<jats:sup>2+</jats:sup> and Zn<jats:sup>2+</jats:sup> vacancy is equal to be 0.3. Furthermore, the defect formation is accompanied with lattice distortion, which plays a vital role in driving the excited phonon traps to reduce the energy loss by non‐radiation transitions. Therefore, the thermal stability of Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphor is also improved via engineering cation vacancies. In addition, the Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphors can be effectively excited by blue light and it exhibits far‐red emission due to the Mn<jats:sup>4+</jats:sup> spin‐forbidden <jats:sup>2</jats:sup>E→<jats:sup>4</jats:sup>A<jats:sub>2</jats:sub> transition. The results suggest that the Ca<jats:sub>14−</jats:sub><jats:italic><jats:sub>x</jats:sub></jats:italic>Al<jats:sub>10</jats:sub>Zn<jats:sub>6−</jats:sub><jats:italic><jats:sub>y</jats:sub></jats:italic>O<jats:sub>35</jats:sub>: Mn<jats:sup>4+</jats:sup> phosphors can have a tremendous potential in indoor plant cultivation.</jats:p>

语种： 英文

作者： Zhou, Nan;Wu, Yufan;Li, Yiran;Yang, Jiankui;Zhou, Qing;...

期刊： Applied Surface Science,2020年500:144026 ISSN：0169-4332

通讯作者： Xia, Mao;Zhou, Zhi

作者机构： [Wu, Yufan; Xia, Mao; Zhou, Qing; Yang, Jiankui; Guo, Yuwei; Zhou, Nan; Zhou, Zhi; Xia, M; Li, Yiran] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Wu, Yufan; Xia, Mao; Zhou, Qing; Yang, Jiankui; Guo, Yuwei; Zhou, Nan; Zhou, Zhi; Xia, M; Li, Yiran] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao; Yang, Jiankui; Zhou, Nan; Zhou, Zhi; Xia, M] Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha, Hunan, Peoples R China.

通讯机构： [Xia, M; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha, Hunan, Peoples R China.

关键词： Anode;Coating;Electrochemical kinetics;Lithium-ion batteries;Si@TiO2-B/CNTs composite

摘要： As an anode with ultrahigh capacity (4200 mAh g−1), silicon (Si) has inherent defects, such as drastic volume change (~300%) and poor conductivity. To cope with these problems, constructing a rigid shell (e.g. TiO2) on the surface of Si particles is an effective method. Typically, monoclinic titanium dioxide (TiO2-B) has the more excellent electrochemical performance among the various crystalline of TiO2 (anatase, rutile, etc.) for its open channel and characteristic pseudocapacitive effect. In addition, carbon nanotubes (CNTs) are good conductor of electricity. It is hopeful to increase the conductivity of the Si anode by adding CNTs. In this work, therefore, a Si@TiO2-B/CNTs composite is prepared by hydrothermal method. The composite exhibits superior electrochemical properties during the half-cell test (1184 mAh g−1 under 0.1 A g−1 at 200th cycles). Furthermore, the electrochemical kinetics of the materials were studied by cyclic voltammetry, which demonstrated that coating TiO2-B could increase the capacitive effects of the composite (68.75%). © 2019 Elsevier B.V.

语种： 英文

作者： Luo, Wei;Su, Yi-Feng;Hu, Qing;Yin, Huai-Lin;Wang, Shuo;...

期刊： BioEnergy Research,2020年13(3):887-895 ISSN：1939-1234

通讯作者： Zhou, Zhi

作者机构： [Wang, Shuo; Zhang, Wei; Wen, Xiao-Xi; Luo, Wei; Zhou, Nan; Zhou, Zhi; Su, Yi-Feng; Huang, Sheng-Xiong; Hu, Qing; Ao, Li-Jiao] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Yin, Huai-Lin; Luo, Wei; Zhou, Zhi; Huang, Sheng-Xiong] Hunan Kegu Environm Protect Technol Co Ltd, Changsha 410128, Peoples R China.

通讯机构： [Zhou, Zhi] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;Hunan Kegu Environm Protect Technol Co Ltd, Changsha 410128, Peoples R China.

关键词： Municipal sludge;Calcium-based;Catalytic pyrolysis;Liquid products

摘要： Aimed to obtain high-quality pyrolysis liquid products, the effects of different calcium-based catalysts and temperatures on liquid products from catalytic pyrolysis of municipal sludge (moisture of 50%) were studied. Results showed that the liquid product yield reached maximum at 600°C and then decreased. The catalyst capability of catalysts decreased the yield of liquid products in the order of poorly soluble in water (Ca(OH)2, CaCO3, CaO) &gt; soluble in water (CaCl2, Ca(H2PO4)2·H2O). High temperature strengthened the aromatization, and the breaking of the oxygen-containing functional group in liquid products resulted in the decrease of O/C and H/C molar ratios and the increase of four components yield in gaseous products. At 600°C, the catalysts significantly reduced the O content of liquid products and increased hydrocarbon content. Meantime, CaO additive increased the content of C to 85.34%, and the relative content of aromatics reached 83.99% at 800°C, which is suitable as chemical raw materials. However, the Ca(OH)2 group had the highest aliphatics content, and the H/C molar ratio was 1.42 at 400°C, which is suitable as fuel. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

语种： 英文

作者： Xia, Mao;Zhang, Yongli;Li, Minghui;Zhong, Yuan;Gu, Simin;...

期刊： 稀土学报(英文版),2020年38(3):227-233 ISSN：1002-0721

通讯作者： Zhou, Nan;Zhou, Zhi

作者机构： [Xia, Mao; Zhang, Yongli; Zhong, Yuan; Zhou, Nan; Zhou, Zhi; Li, Minghui; Gu, Simin] Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.;[Xia, Mao; Zhang, Yongli; Zhong, Yuan; Zhou, Nan; Zhou, Zhi; Gu, Simin] Hunan Opt Agr Engn Technol Res Ctr, Changsha 410128, Peoples R China.;[Xia, Mao] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.

通讯机构： [Zhou, N; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Peoples R China.

关键词： Aluminum compounds;Charge transfer;Crystal structure;Electron transitions;Luminescence;Phosphors;Thermodynamic stability;Titanium compounds;X ray powder diffraction;Blue-violet-emitting;Concentration quenching;Emitting phosphors;High thermal stability;Luminescence emission;Luminescent material;Luminescent property;Plant growth;Calcium compounds

摘要： Blue-violet light can not only enhance the total content of biomass and glucoside but also enrich the taste of the fruit. Thus, it is meaningful to study the blue-violet luminescent materials for plant cultivation. In this study, titanium (IV) -activated CaYAlO4 (CYAO) phosphors were synthesized by conventional high-temperature solid–state reaction. X-ray powder diffraction was employed to analyze the crystal-structure of CYAO. It is found that the doped Ti4+ ions do not change obviously the crystal structure of phosphors. Upon 246 nm excitation, CaYAl1-xO4:xTi4+ phosphors exhibit broad blue-violet emission band peaking at 395 nm, which can be attributed to the charge transfer of Ti4+–O2–. Moreover, this phosphor exhibits strong thermal stability. The luminescence emission intensity at 150 °C maintained about 91 mol% of its initial value at room temperature. Additionally, the electron transition process and concentration quenching mechanism of CaYAl1–xO4:xTi4+ are discussed in detail. The excellent luminescent properties indicate that CaYAl1-xO4:xTi4+ phosphor may have promising application in indoor plant cultivation. © 2019

语种： 英文

作者： Zhao, Xiao-Ru;Xu, Xia;Teng, Jie;Zhou, Nan;Zhou, Zhi;...

期刊： Ecotoxicology and Environmental Safety,2019年176:11-19 ISSN：0147-6513

通讯作者： Yu, Jin-Gang

作者机构： [Jiang, Xin-Yu; Jiao, Fei-Peng; Xu, Xia; Yu, Jin-Gang; Zhao, Xiao-Ru] Cent S Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.;[Teng, Jie] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Yu, Jin-Gang; Zhou, Nan; Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Yu, Jin-Gang] C;Cent S Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.

关键词： Adsorption;Graphene oxide;Inorganic/organic substances;Maize amylopectin;Mechanism

摘要： Three-dimensional (3D) porous graphene oxide-maize amylopectin (GO-MA) composites with controllable pore-sizes composites in the range of 6-40nm were prepared by facile hydrothermal-assisted assembly approaches. The morphologies, pore sizes, specific surface area (SSA) and compositions of GO-MAx:y composites with and different GO-to-MA mass ratios (x:y) were characterized by scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). To reveal the adsorption-desorption mechanism, effects of contact time, temperature, initial adsorbate concentration, pH value of the solution on the adsorption process were studied in detail. The adsorption capacities of 3D GO-MA20:1 composite for organic contaminants including tert-butyl hydroquinone (TBHQ), p-aminophenol (PAP), p-nitrophenol (PNP), o-nitrophenol (MNP), hydroquinone (HQ), alizarin red S (ARS) and neutral red (NR) were 22.17, 116.4, 44.78, 36.96, 16.10, 39.92 and 24.23mgg(-1), respectively. The adsorption capacities of GO-MA30:1 composite for inorganic substances including Pb(2+), Mn(2+), Cr2O7(2-), Cd(2+), Cu(2+), Nd(3+), La(3+), Y(3+), Yb(3+) and Er(3+) were 84.76, 7.92, 13.6, 17.64, 30.56, 25.52, 12.48, 16.96, 23.32 and 30.32mgg(-1), respectively. In addition, GO-MAx:y composites also exhibited high mechanical properties and good reusability. Consequently, GO-MAx:y composites could be used as reusable adsorbents for removal/enrichment inorganic/organic substances in aqueous solutions.

语种： 英文

作者： Zhou, Nan;Gao, Peixing;Yang, Yimei;Zhong, Yuan*;Xia, Mao;...

期刊： Journal of the Taiwan Institute of Chemical Engineers,2019年104:360-368 ISSN：1876-1070

通讯作者： Zhong, Yuan;Zhou, Zhi

作者机构： [Xia, Mao; Zhong, Yuan; Zhou, Zhi; Zhang, Ye; Yang, Yimei; Zhou, Nan; Gao, Peixing] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhang, Ye; Yang, Yimei; Zhong, Yuan; Zhou, Nan; Gao, Peixing; Zhou, Zhi] Hunan Prov Engn Technol Res Ctr Opt Agr, Changsha 410128, Hunan, Peoples R China.;[Tian, Yun; Lu, Xiangyang] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhong, Y; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Activation energy;Citrus fruits;Emission spectroscopy;High temperature applications;Light emitting diodes;Phosphors;Solid state reactions;Thermodynamic stability;Chromaticity coordinates;Concentration quenching;Concentration-dependent;Diffuse reflection spectra;Excitation and emission spectra;High temperature solid-state reaction;Internal quantum efficiency;Plant growth;Light emission

摘要： In this paper, a series of novel orange-red emission phosphors Sr8ZnY(PO4)(7):Sm3+ (SZYP:Sm3+) were synthesized by high-temperature solid-state reaction. The photoluminescence and concentration-dependent properties of this phosphor were investigated carefully through diffuse reflection spectra, excitation and emission spectra, Commission Internationale de l'Eclairage (CIE) chromaticity coordinate and decay times. SZYP:Sm3+ could be efficiently excited by n-UV and blue lights which center at 318, 345, 363, 376, 401, 410, 440 and 475 nm, respectively. The characteristic orange-red emission peaking at 563, 601 and 647 nm had been detected, which should be attributed to the characteristic f-f forbidden transition of Sm3+. The internal quantum efficiency (IQE) of ideal phosphor of SZYP:0.09Sm(3+) reached as high as 47%. In addition, The concentration quenching mechanism and thermal stability of SZYP:Sm3+ were further investigated. It was found SZYP:Sm3+ can maintain 93% of initial emission intensity at 150 degrees C and the corresponding activation energy was calculated to be 0.26 eV based on Arrhenius formula. The emission intensity of 1.0Mg(2+) and 0.02Al(3+) incorporated SZYP:0.09Sm(3+) reached up to 134% and 117% of the initial value, respectively. Moreover, (light-emitting diodes) LED devices were fabricated by employing the optimized samples as orange-red component with 365 nm n-UV chips. The desired emission in plant absorption region and extremely high thermal stability imply that SZYP:Sm3+ is suitable for the application in plant growth LED lighting. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

语种： 英文

作者： 周智;吴贤波;钟美娥;周南

期刊： 化工时刊,2019年33(02):51-52 ISSN：1002-154X

作者机构： 湖南农业大学 理学院,湖南 长沙,410128;[钟美娥; 周南; 周智; 吴贤波] 湖南农业大学

关键词： 材料化学;实验教学;改革

摘要： 实验教学是高校教学的重要环节之一, 亦是材料化学专业人才培养的一个重要组成部分, 对材料化学专业课程实验教学进行改革与探究, 对培养高素质的创新型人才具有非常重要的意义.随着新时代的发展, 实验课程教学早已从书本转移到实际操作.进行实际实验操作不仅可以提高大学生的实践能力, 还可以开拓其创新思维、提高创新能力.但是, 现在的材料化学专业课程实验教学已经不能完全满足新时代的发展对材料化学专业学生的要求.通过实践证明, 实验教学与专业科研软件教学能够更加全面的提高材料化学专业学生的综合能力, 更加满足社会对学生能力的要求.

语种： 中文

作者： 刘德明;李诗凯;唐佳杰;周南;钟美娥

期刊： 广州化工,2019年47(20):55-58 ISSN：1001-9677

作者机构： 湖南农业大学分析测试中心,湖南 长沙,410128;湖南农业大学理学院,湖南 长沙,410128;[唐佳杰; 钟美娥; 周南; 李诗凯; 刘德明] 湖南农业大学

关键词： 溶剂热法;影响因素;磷酸钒锂;微球

摘要： Li3V2(PO4)3因其突出的理论比容量和较高的工作电压,被认为是极具应用潜力的新一代锂离子电池正极材料之一.本实验以LiOH,NH4H2PO4和NH4VO3为反应原料,通过溶剂热法合成Li3V2(PO4)3(LVP)正极材料.探讨了原料的添加顺序,溶剂的种类和比例,反应温度以及保温时间对LVP形貌和粒径的影响.利用扫描电镜观察其形貌和粒径,采用X射线衍射仪表征其晶体结构.实验结果表明:所用溶剂对LVP材料的结构和形貌有显著影响.当选择乙二醇与水混合物(EG:H2 O=1:1)作溶剂,在200℃下反应6 h时,可获得粒径小而均匀的LVP微球.

语种： 中文

作者： 周智;罗伟;周南

期刊： 化工时刊,2019年33(05):53-54 ISSN：1002-154X

作者机构： 湖南农业大学理学院,湖南长沙,410128;[罗伟; 周南; 周智] 湖南农业大学

关键词： 本科生;化学专业;科研意识;科研能力

摘要： 现阶段的本科教育缺乏对学生科研意识与能力的培养.本人从事化学本科教育多年,发现化学专业的本科生对科研缺乏理解,缺少主动的科研精神和动手意愿.针对这一问题,本文提出了从培养学生的主观能动性,加强理论知识学习,提升动手能力、强化实际操作,培养学生的耐心和自信心,拓展大学生的创新能力等五个方面对本科生的科研意识与能力进行教育,激发本科生的科研兴趣,提升科研能力,为今后本科生进一步的发展打下良好基础.

语种： 中文

作者： 周智;张永丽;周南;杨建奎

期刊： 化工时刊,2019年33(03):53-54 ISSN：1002-154X

作者机构： 湖南农业大学理学院,湖南长沙,410128;[杨建奎; 张永丽; 周南; 周智] 湖南农业大学

关键词： 农业性院校;教学改革;应用型

摘要： 随着我国高等教育事业的不断发展,各大高校各专业大学生的化学课程基本普及,农业性院校更是不可或缺,针对农业性院校化学实验课堂出现的问题。本次化学实验教学改革探析从原因、管理、意识、改进等方面分析并解决问题,为农业性院校培养高素质的应用型人才。

语种： 中文

作者： 钟美娥;周南

期刊： 化工时刊,2019年33(08):53-55 ISSN：1002-154X

作者机构： 湖南农业大学理学院,湖南长沙,410128;[钟美娥; 周南] 湖南农业大学

关键词： 产学研一体化;研究生社会实践;培养模式

摘要： 针对社会实践活动中研究生主观能动性不强,实践活动形式化严重等问题,提出了一系列的改进措施.从构建系统的研究生实践能力培养课程体系;寻找并建立稳定的研究生导师队伍;激发研究生投身于实践活动的兴趣;加强研究生社会实践活动的宣传;设立专项资金,建立研究生社会实践基地等方面入手,对研究生社会实践能力培养模式提出了优化思路.并结合我国目前的社会发展情况,对优化思路的可行性进行了客观具体的分析.

语种： 中文

作者： Zhou, Nan;Zu, Junning;Feng, Qiuju;Chen, Huanli;Li, Juan;...

期刊： Environmental Science and Pollution Research,2019年26(26):26947-26962 ISSN：0944-1344

通讯作者： Zhou, Zhi;Zhuang, Shuxin

作者机构： [Zhong, Mei-e; Chen, Huanli; Li, Juan; Zhou, Nan; Zhou, Zhi; Zu, Junning] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Feng, Qiuju] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Zhuang, Shuxin] Xiamen Univ Technol, Sch Mat Sci & Engn, Key Lab Funct Mat & Applicat Fujian Prov, Xiamen 361024, Fujian, Peoples R China.

通讯机构： [Zhou, Zhi] H;[Zhuang, Shuxin] X;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Xiamen Univ Technol, Sch Mat Sci & Engn, Key Lab Funct Mat & Applicat Fujian Prov, Xiamen 361024, Fujian, Peoples R China.

关键词： Biochar;Pyrolysis condition;Surface property;Tobacco stem;Adsorption mechanism

摘要： To clarify the adsorption mechanism of multi-ions on biochars in competitive environment is very important for the decontamination of co-existed heavy metals. Herein, tobacco stem was pyrolyzed in different temperatures with selected residences to obtain biochars with various surface chemistry. Then the adsorption of co-existed typical heavy-metal ions like lead, cadmium, and copper was studied, followed with systematic analysis of surface properties of the post-adsorption biochars. After carefully examining the adsorption performance and surface property alteration of the demineralized biochars, the adsorption mechanism of multi-ions in competitive environment was discovered. Lead showed the most competitive nature with co-existence of cadmium and copper, but the adsorption capacity reduced significantly with the removal of minerals. Combined with the observation of large amount of lead containing crystals on the post-adsorption biochars, the main adsorption mechanism of lead should be precipitation. The adsorb capability of copper barely changed for biochars with and without minerals, which suggests the best affinity of copper on surface functional groups even with large content of competitors. Biochar that pyrolyzed in 700 °C for 6 h that contained more aromatic structures showed the highest sorbing capability of cadmium, which suggested the dominant position of cation-π interaction in cadmium removal. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： Zhou, Nan;Wang, Yifan;Yao, Denghui;Li, Shikai;Tang, Jiajie;...

期刊： Journal of Cleaner Production,2019年221:63-72 ISSN：0959-6526

通讯作者： Zhong, Mei-e;Zhou, Zhi

作者机构： [Zhong, Mei-e; Zhong, ME; Zhou, Zhi; Li, Shikai; Zhu, Xiaoyu; Shen, Da; Huang, Liyang; Zhou, Nan; Yao, Denghui; Wang, Yifan; Tang, Jiajie] Hunan Agr Univ, Coll Sci, Furong Rd, Changsha 410128, Hunan, Peoples R China.;[Zhong, Mei-e; Zhou, Nan; Zhou, Zhi; Wang, Yifan] Hunan Agr Univ, Hunan Engn Res Ctr Biochar, Changsha 410128, Hunan, Peoples R China.;[Zhou, Nan; Zhou, Zhi; Yao, Denghui] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.

通讯机构： [Zhong, ME; Zhou, Z] H;Hunan Agr Univ, Coll Sci, Furong Rd, Changsha 410128, Hunan, Peoples R China.

关键词： Activation energy;Adsorption;Cadmium compounds;Carbonization;Heavy metals;Hydrogen bonds;Pyrolysis;Sodium Carbonate;Sodium compounds;Soil pollution control;Acidic catalysts;Adsorption properties;Bio chars;Biochar adsorbents;Cadmium adsorption;Heavy metal remediation;Removal efficiencies;Surface functional groups;Ion exchange

摘要： The enhancement of surface functional groups of biochar is essential to improving the biochar contaminant adsorption. Current pyrolysis methods that are accompanied by activation are energy consuming and costly. Herein, a novel wet-pyrolysis system that was carried out in open air, with simultaneous conversion and modification to produce an effective biochar adsorbent, is described. Within this system, the surface of the biochar was oxidized partially to produce sufficient functional groups at the surface, whereas carbonization of the biomass (miscanthus sacchariflora) occurs under an acidic catalyst. The characteristic results confirmed the attachment of abundant surface functional groups, including hydroxyl and carboxyl groups, which increased in content with the ongoing reaction time. Neutralization with sodium carbonate removed the hydrogen bonds and enhanced the adsorption properties. The biochar that was obtained by using this technique exhibited an excellent cadmium adsorption capacity of 197 mg.g −1 and a high removal efficiency of 99%. Analysis of the Cd-loaded biochar indicated that adsorption occurred via ion exchange, and formed cadmium complexes. It could be concluded that this novel wet-pyrolysis system is a promising approach to produce biochar efficiently and cost-effectively for heavy-metal remediation. © 2019 Elsevier Ltd

语种： 英文

作者： Zou, Jiao;Yuan, Meng-Meng;Huang, Zhao-Ning;Chen, Xiao-Qing;Jiang, Xin-Yu;...

期刊： Materials Science and Engineering C: Materials for Biological Applications,2019年103:109848 ISSN：0928-4931

通讯作者： Yu, Jin-Gang

作者机构： [Jiang, Xin-Yu; Zou, Jiao; Jiao, Fei-Peng; Yuan, Meng-Meng; Yu, Jin-Gang; Huang, Zhao-Ning; Chen, Xiao-Qing] Cent S Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.;[Zhou, Nan; Zhou, Zhi] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Yu, Jin-Gang] C;Cent S Univ, Coll Chem & Chem Engn, Key Lab Hunan Prov Water Environm & Agr Prod Safe, Changsha 410083, Hunan, Peoples R China.

关键词： Absorption spectroscopy;Chitosan;Cyclic voltammetry;Electrochemical impedance spectroscopy;Electrochemical sensors;Fourier transform infrared spectroscopy;Glass membrane electrodes;Graphene;Morphology;Nanotubes;Phenols;Scanning electron microscopy;Self assembly;Signal to noise ratio;Yarn;Bis-phenol a;Differential pulse voltammetry;Electrochemical behaviors;Fourier transform infra red (FTIR) spectroscopy;Graphene nanoplatelets;Modified glassy carbon electrode;Multiwalled carbon nanotube (MWCNTs);Zeta potential analysis;Multiwalled carbon nanotubes (MWCN);4,4' isopropylidenediphenol;benzhydryl derivative;carbon nanotube;graphite;phenol derivative;animal;chemistry;electrochemical analysis;milk;sensitivity and specificity;Animals;Benzhydryl Compounds;Electrochemical Techniques;Graphite;Milk;Nanotubes, Carbon;Phenols;Sensitivity and Specificity

摘要： Graphene nanoplatelets (GNPs), multiwalled carbon nanotube (MWCNTs) and chitosan (CS) were self-assembled by a facile one-step hydrothermal reaction to obtain novel MWCNTs-CS enfolded GNPs (GNPs-MWCNTs-CS) composite. Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), UV–visible (UV–vis) absorption spectroscopy and zeta potential analysis were employed to characterize the morphology, surface composition, interaction, surface charge and stability of the GNPs-MWCNTs-CS composite. The electrochemical behaviors of GNPs-MWCNTs-CS composite modified glassy carbon electrode (GNPs-MWCNTs-CS/GCE) were investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The GNPs-MWCNTs-CS/GCE was used for fast and high sensitive determination of bisphenol A (BPA) by differential pulse voltammetry (DPV). Under the optimum conditions, the calibration curve obtained is linear for the current versus the BPA concentration in the range 0.1–100 μM with a detection limit of 0.05 nM (signal-to-noise ratio of 3, S/N = 3). The between-sensor reproducibility was 1.29% (n = 6) for 0.04 mM BPA. The proposed GNPs-MWCNTs-CS/GCE based sensor showed high resistance to interference, good repeatability and excellent reproducibility. Trace BPA in milk samples could also be reliably determined. © 2019

语种： 英文

作者： Zhou, Nan;Wu, Yufan;Zhou, Qing;Li, Yiran;Liu, Shihan;...

期刊： Applied Surface Science,2019年486:292-302 ISSN：0169-4332

通讯作者： Zhou, Zhi;Xia, Mao

作者机构： [Wu, Yufan; Xia, Mao; Zhou, Qing; Zhou, Nan; Zhou, Zhi; Liu, Shihan; Li, Yiran] Hunan Agr Univ, Coll Sci, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;[Wu, Yufan; Xia, Mao; Zhou, Qing; Zhou, Nan; Zhou, Zhi; Liu, Shihan; Li, Yiran] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao; Zhang, Hongbo] Cent S Univ, State Key Lab Power Met, Changsha 410083, Hunan, Peoples R China.

通讯机构： [Zhou, Zhi] H;[Xia, Mao] C;Hunan Agr Univ, Coll Sci, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;Cent S Univ, State Key Lab Power Met, Changsha 410083, Hunan, Peoples R China.

关键词： Hydrothermal method;Li-ion diffusion coefficient;Lithium-ion batteries;SiO;TiO2 (B)

摘要： Silicon monoxide (SiO) is regarded as a great potential anode material for high-energy lithium-ion batteries (LIBs) owing to the high theoretical specific capacity (2650 mAh g−1), low voltage platform, eco-friendly and rich reserves. However, the particle pulverization, induced by large volume change during (de)lithiation, can result in the capacity degrading significantly. As we all know, it is a good strategy that using TiO2 to modify the SiO-based anode. TiO2 can serve as rigid outer layer to keep the structural integrity. In addition, the electrochemical performances of monoclinic TiO2 (B) are better than anatase and rutile TiO2. Therefore, compositing with TiO2 (B) is an admissible method to enhance the electrochemical properties of SiO-based materials. And the pretreated-SiO/TiO2 (B) composites (abbreviated as p-STB) are prepared by hydrothermal treatment at 180 °C for 12 h and then calcined at 325 °C for 2 h. In this paper, p-STB-1 and p-STB-2 are prepared that the weight ratios p-SiO and TiO2 (B) are 4:1 and 3:1, respectively. The structure and components of composites are also performed on X-ray diffraction (XRD), Fourier transform infrared reflectance (FT-IR) spectroscopy, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). For p-STB, TiO2 (B) is mainly covered on the surface of pretreated SiO (p-SiO). The Li-ion diffusion coefficients of as-prepared materials are calculated by cyclic voltammetry and electrochemical impedance spectroscopy. The electrochemical test results suggest that the p-STB-1 has batter cycling performance (730 mAh g−1 after 100th cycle) and admirable rate capacity (450 mAh g−1 under 3.2 A g−1). The modified method, which was compositing with TiO2 (B), is beneficial to the commercialization of SiO-based materials. © 2019 Elsevier B.V.

语种： 英文

作者： Zhou, Zhi;Zhong, Yuan;Gu, Simin;Su, Yifeng;Xia, Mao;...

期刊： Journal of the American Ceramic Society,2019年102(4):1843-1851 ISSN：0002-7820

通讯作者： Zhou, Nan;Wang, Jing

作者机构： [Xia, Mao; Zhou, Nan; Wang, Jing; Su, Yifeng; Zhang, Yongli; Zhong, Yuan; Zhou, Zhi; Gu, Simin] Hunan Agr Univ, Coll Sci, Changsha, Hunan, Peoples R China.;[Xia, Mao] Cent S Univ, State Key Lab Powder Met, Changsha, Hunan, Peoples R China.;[Wang, Jing] Sun Yat Sen Univ, Sch Chem, Sch Mat Sci & Engn, Guangzhou, Guangdong, Peoples R China.

通讯机构： [Zhou, N; Wang, J] H;Hunan Agr Univ, Coll Sci, Changsha, Hunan, Peoples R China.

关键词： luminescence;phosphors;photoluminescence

摘要： In this paper, we introduced a bluish violet-emitting phosphor Ca3Al4ZnO10:Ti (IV) (CAZO:Ti4+) synthesized by high-temperature solid-state reaction. Upon 265nm excitation, a broad emission band spanned from 300nm to 500nm and centered at 370nm was observed. In addition, the effects of flux and charge compensation to photoluminescence properties of CAZO:Ti4+ were systematically investigated. The results show that 103% improvement of emission intensity was achieved when 1% H3BO3 flux was introduced and 32.8% enhancement of it for 2% Ca2+ vacancies doped as charge compensator. Moreover, the lifetimes, band gap energy, concentration quenching mechanism, as well as electron transition process of CAZO:Ti4+ were discussed. Due to the efficient broad bluish violet emission, this phosphor may find a potential application in mercury vapor-excited fluorescent lamp for plant growth. © 2018 The American Ceramic Society

语种： 英文

作者： Zhong, Mei-e;Guan, Jindiao;Sun, Jingchun;Guo, Hui;Xiao, Zhubing;...

期刊： Electrochimica Acta,2019年299:600-609 ISSN：0013-4686

通讯作者： Gui, Qingwen

作者机构： [Zhong, Mei-e; Sun, Jingchun; Guo, Hui; Gui, Qingwen; Zhou, Nan; Guan, Jindiao] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xiao, Zhubing] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China.;[Gong, Daoxin] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Gui, Qingwen] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Lithium-sulfur batteries;Tobacco stem;Nanodots-decorated;Alveolate;Tridoped

摘要： Rechargeable lithium-sulfur (Li-S) batteries are a significant energy-storage device owing to their eco-friendliness and high theoretical energy density. However, the shuttle effect of soluble polysulfides as well as the slow redox kinetics constrains the development of Li-S batteries. Herein, carbon nanodots-decorated alveolate N, O, S tridoped hierarchical porous carbon (a-NOSPC) material is synthesized via facile pyrolysis of tobacco stem. The coexistence of micropores, mesopores, and macropore in the hierarchical porous carbon are beneficial for physical accommodating/immobilizing active materials sulfur and rapid charge/ion transfer. Meanwhile, the N, O, S dopants provide rich electrocatalytic active site in chemical binding of polysulfides and their accelerated redox kinetics, thus guaranteeing high utilization on active materials. The resultant a-NOSPC/S cathode with an 2.7 mg cm(-2) areal sulfur loading delivers a high reversible areal capacity of 2.90mAh cm(-2) at 0.1 C, maintaining 2.01mAh cm(-2) over 100 cycles, which is obviously superior to the most reported biochar-based electrodes. Our results provide an appealing avenue to the design of multifunctional sulfur host for advanced Li-S batteries. (C) 2019 Elsevier Ltd. All rights reserved.

语种： 英文

作者： Zhuang Shu-xin*;He Jia-yi;Zhang Wei-peng;Zhou Nan;Lu Mi;...

期刊： 中南大学学报(英文版),2019年26(6):1387-1401 ISSN：2095-2899

通讯作者： Zhuang Shu-xin

作者机构： [He Jia-yi; Lu Mi; Sun Jing-jing; Lian Ji-qiong; Zhang Wei-peng; Zhuang Shu-xin] Xiamen Univ Technol, Sch Mat Sci & Engn, Key Lab Funct Mat & Applicat Fujian Prov, Xiamen 361024, Fujian, Peoples R China.;[Zhou Nan] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhuang Shu-xin] X;Xiamen Univ Technol, Sch Mat Sci & Engn, Key Lab Funct Mat & Applicat Fujian Prov, Xiamen 361024, Fujian, Peoples R China.

关键词： Electrocatalysis;Electrocatalysts;Electrodes;Metal-air batteries;Oxygen;Physicochemical properties;Stability;Bifunctional electrocatalysts;Catalytic performance;Fabrication method;Oxygen evolution reaction;Perovskite type oxides;preparation;Preparation method;Structural stabilities;Perovskite

摘要： Recent advances in the preparation and application of perovskite-type oxides as bifunctional electrocatalysts for oxygen reaction and oxygen evolution reaction in rechargeable metal-air batteries are presented in this review. Various fabrication methods of these oxides are introduced in detail, and their advantages and disadvantages are analyzed. Different preparation methods adopted have great influence on the morphologies and physicochemical properties of perovskite-type oxides. As a bifunctional electrocatalyst, perovskite-type oxides are widely used in rechargeable metal-air batteries. The relationship between the preparation methods and the performances of oxygen/air electrodes are summarized. This work is concentrated on the structural stability, the phase compositions, and catalytic performance of perovskite-type oxides in oxygen/air electrodes. The main problems existing in the practical application of perovskite-type oxides as bifunctional electrocatalysts are pointed out and possible research directions in the future are recommended.

语种： 英文

作者： Mao Xia;Li Yi-ran;Xiang Xiong;Wang Hu;Tang, Yi-wei;...

期刊： Journal of Alloys and Compounds,2019年800:116-124 ISSN：0925-8388

通讯作者： Zhi Zhou;Zhang, Hong-bo

作者机构： [Nan Zhou; Li Yi-ran; Zhi Zhou; Tang, Yi-wei; Mao Xia] Hunan Agr Univ, Coll Sci, Hunan Prov Engn Technol Res Ctr Opt Agr, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;[Xiang Xiong; Mao Xia; Wang Hu; Zhang, Hong-bo] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.

通讯机构： [Zhi Zhou] H;[Zhang, Hong-bo] C;Hunan Agr Univ, Coll Sci, Hunan Prov Engn Technol Res Ctr Opt Agr, 1 Nongda Rd, Changsha 410128, Hunan, Peoples R China.;Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.

关键词： Amorphous carbon;Anodes;Barium titanate;Electric discharges;Electric potential;Electrochemical properties;Ions;Lithium;Nanotubes;Piezoelectric materials;Piezoelectricity;Silicon compounds;Silicon oxides;Transmissions;Amorphous carbon matrix;Charge-discharge process;Electrochemical performance;High-power lithium-ion batteries;Ion Mobility;Large volumes;Piezoelectric potential;Silicon monoxide;Lithium-ion batteries

摘要： Silicon monoxide (SiO)-based negative materials have attracted widespread attention due to the low working potential and high specific capacity. However, the large volume dilation (about 200%) is adverse to the electrochemical performance of battery during the charge-discharge process. To overcome the disadvantage of volume change, much effort has been paid to minimize the volume expansion. Unfortunately, the volume change is inescapable no matter how to modify the SiO-based materials. Therefore, utilizing the characteristics of volume expansion to improve the electrochemical properties of SiO-based material is the most desirable method. Piezoelectric materials can generate local piezoelectric field when suffer from the mechanical stress, which serves as a driving force to accelerate the transmission speed of Li ion, result in the improve of electrochemistry performance. In this work, SiO@C/BaTiO3/Carbon nanotubes composites are successfully synthesized and served as anode materials for lithium ion batteries (LIBs). The SiO and BaTiO3 are dispersed uniformly in amorphous carbon matrix, the large volume expansion of SiO can transfer to the BaTiO3 via the carbon matrix. When the BaTiO3 nanoparticles poled, the piezoelectric potential is generated, which can promote the mobility of Li ion. Carbon nanotubes provides the transmission channel to accelerate the diffusion of Li ion, which is benefited to the constitution and structure of composite, the SiO@C/BaTiO3/Carbon nanotubes exhibit excellent electrochemical performance with a high charge capacity of 711. 7 mAh g−1 and a high capacity retention of 92.4% after 200 cycles at 100 mA g−1. Experimental results suggest that the piezoelectric material BaTiO3 can enhance the electrochemical properties of SiO-based materials. © 2019 Elsevier B.V.

语种： 英文

作者： Wu, Xianbo;Liu, Longhai;Xia, Mao;Huang, Shengxiong;Zhou, Yue;...

期刊： Ceramics International,2019年45(8):9977-9985 ISSN：0272-8842

通讯作者： Zhou, Zhi;Zhou, Nan

作者机构： [Xia, Mao; Zhou, Zhi; Zhou, Nan; Huang, Shengxiong; Wu, Xianbo; Liu, Longhai; Zhou, Yue] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Huang, Shengxiong; Wu, Xianbo; Zhou, Zhi; Zhou, Nan; Liu, Longhai; Zhou, Yue] Hunan Agr Univ, Hunan Opt Agr Engn Technol Res Ctr, Changsha, Hunan, Peoples R China.;[Xia, Mao; Hu, Wang] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.

通讯机构： [Zhou, Z; Zhou, N] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.

关键词： Cation vacancies;Phosphor;Photoluminescence;Plant growth lighting;Ti 4+ -activated

摘要： Ti 4+ -activated zinc calcium aluminate phosphors, owing to their excellent luminescence properties, nontoxicity, environment friendliness and low price, have a certain prospect in the field of plant cultivation. In this study, we have successfully synthesized a series of Ca 14-y Al 10-x Zn 6-z O 35 :xTi 4+ (CAZO:Ti 4+ ) phosphors through a high-temperature solid-state method. Furthermore, the emission spectrum of CAZO:Ti 4+ located in bluish violet-emitting band, and has an emission peak at 378 nm upon the excitation of 268 nm due to the charge transfer of Ti 4+ -O 2- . Moreover, the luminescence intensity of as-synthetized phosphors can be improved by cation vacancies engineering to compensate for charge unbalance. Especially, the luminescence intensity could be further improved when the Ca 2+ vacancy is 0.35 mol or the Zn 2+ vacancy is 0.275 mol. Furthermore, the X-ray powder diffraction (XRD) analysis and crystal structure are checked and confirmed that the synthesized material is pure phase. The concentration quenching mechanism, FT-IR spectra, UV–vis absorption properties, lifetimes and electron transition process of Ca 14-y Al 10-x Zn 6-z O 35 : xTi 4+ were discussed in detail. From the above, the phosphor has a potential application for plant growth field due to its broad bluish violet emission. © 2019

语种： 英文