摘要：
With the development of the removal of organic pollutants in the soil and water environment, antibiotics have been considered as emerging pollutants and received considerable attention among the scientific community. Thus, there is a need for an effective, economical, fast, operational feasible and environmental-friendly technology to remove antibiotics. Adsorption technology would be one of the most promising option on the basis that it best meets the criteria we set out above. From the most primitive activated carbon to the most innovative modified biochar, carbon-based materials have played a significant role in the adsorption process of antibiotics all the time. This paper reviews the adsorption behavior of some representative antibiotics (e.g., chloramphenicols, sulfonamides, tetracyclines, flouroquinolones) over various carbonaceous materials (i.e., activated carbon, carbon nanotubes, graphene, and biochar). Nevertheless, in addition to the structural characteristics and adsorption capacities of carbon-based materials, a special emphasis was placed on the underlying adsorption mechanisms and roles of different influencing factors in the adsorption process. Moreover, the knowledge gaps and research challenges have been highlighted, including design and optimization of the carbonaceous materials for antibiotics adsorption.
摘要：
用VGCF为模板,用共沉淀方法辅助合成了棒状结构的LiNi1/3Co1/3Mn1/3O2。通过X-射线衍射仪(XRD)、X射线能谱仪(EDX)、扫描电子显微镜(SEM)对其结构进行了表征,并研究了其电化学性能。结果表明:该材料为棒状且表面多孔,并表现出了良好的电化学性能。在0. 2 C(1 C=170 m A/g)的电流密度下,其容量为160 m Ah/g以上,在1 C下经过250个循环后容量仍然有115. 2 m Ah/g,对于制备其他棒状结构的锂离子正极材料提供了一定的借鉴。
通讯机构：
[Cai, Changqun] X;Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environmentally Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.
关键词：
G-wire;Label-free;Enzyme-free;Cell lysates
摘要：
An enzyme-free resonance light scattering (RLS) method is described for the determination of microRNA-122. A guanine nanowire (G-wire) is used that consists of a predesigned DNA1 and a G-quadruplex sequence DNA2. These hybridize with microRNA-122 and partially hybridize with DNA2. After formation of stable double strands with DNA1, DNA2 is released. On addition of K+ and Mg2+ ions, the G-quadruplex sequences undergo self-assembly to form long filamentous G-wires. This increases the intensity of RLS. A 6.1 pM detection limit was obtained, and the linear response covers the 50 pM to 300 nM microRNA concentration range. The method was successfully applied to the quantitation of microRNA-122 in hepatocellular carcinoma cell lysates. Conceivably, this assay can be extended to other RLS methods for biomarker detection by simply changing the sequence of DNA1.
摘要：
Tungsten oxide (WO3) as electrode material has the drawbacks including poor rate capability and low capacitance. We firstly report a facile strategy to prepare WO3/MXene composite by intimately electrostatic attraction between the positively charged WO3 nanorods (WNRs) and the negatively charged transition metal carbides (MXene). This type composite shows higher specific capacitance (297 F g(-1)) compared with pure WNRs (121 F g(-1)) at a current density of 1 A g(-1) in 0.5 MH2SO4 aqueous electrolyte. In addition, the as-prepared composite electrode displays good retention rate (82.2% retention at 5 A g(-1)) and cyclic stability (73.4% even after 5000 cycles at 4 A g(-1)). The attractive electrochemical performance of WNRs/MXene may be attributed to the main reasons as follows: The MXene acts as electrons collector effectively improving the electrical conductivity and supplying more electrons to participate redox reactions happened on the surface and interior of WNRs; The electrostatic self-assembly improves the stability of WNRs/MXene. (C) 2019 Elsevier B.V. All rights reserved.
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.
期刊：
ELECTRONIC JOURNAL OF DIFFERENTIAL EQUATIONS,2019年2019 ISSN：1072-6691
作者机构：
School of Public Administration and Emergency Management, Jinan University, Guangzhou, 510632, China;College of Continuing Education and Open College, Guangdong University of Foreign Studies, Guangzhou, 510420, China;Science College, Hunan Agricultural University, Changsha, 410128, China;Modern Business and Management Department, Guangdong Construction Polytechnic, Guangzhou, 510440, China;School of Mathematics and Statistics, Central South University, Changsha, 410083, China
关键词：
Breather;discrete nonlinear Schrodinger equation;subquadratic;critical point
摘要：
In this article we study discrete nonlinear Schrodinger equations without periodicity assumptions. We show the existence of multiple solutions of the form u(n)e(-iwt) (called breathers) by using Clark's Theorem in critical point theory.
摘要：
The 2D transition metal carbide (MXene) is a new type of promising material for energy storage due to its metallic conductivity and highly active surface. This paper describes a new photo -responsive Azo-MXene hybrid that is fabricated through electrostatic interactions between the negatively charged MXene and the cationic Azo-surfactants. After performing systematical characterizations, we found a strong electrostatic interaction force between the MXene and Azo-surfactants in this hybrid and a uniform distribution of Azo groups in the MXene structure. Notably, this Azo-MXene hybrid can self-assemble to an aggregated structure due to the hydro-phobization of Azo on the surface of MXene. Furthermore, the self-assembly of this hybrid can be modulated by ultraviolet light irradiation. This process of transition is also responsible for the hybrid's electrochemical performance upon ultraviolet light irradiation, which may be applied as a photo -responsive conductive material for photo-energy conversion and storage devices.
