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Insight into highly efficient simultaneous photocatalytic removal of Cr(VI) and 2,4-diclorophenol under visible light irradiation by phosphorus doped porous ultrathin g-C3N4 nanosheets from aqueous media: Performance and reaction mechanism

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成果类型:
期刊论文
作者:
Deng, Yaocheng;Tang, Lin*;Zeng, Guangming*;Zhu, Zhejing;Yan, Ming;Zhou, Yaoyu;Wang, Jiajia;Liu, Yani;Wang, Jingjing
通讯作者:
Tang, Lin;Zeng, Guangming
作者机构:
[Zeng, Guangming; Wang, Jiajia; Deng, Yaocheng; Zhu, Zhejing; Tang, Lin; Wang, Jingjing; Liu, Yani; Yan, Ming; Tang, L; Zeng, GM] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
[Zeng, Guangming; Wang, Jiajia; Deng, Yaocheng; Zhu, Zhejing; Tang, Lin; Wang, Jingjing; Liu, Yani; Yan, Ming] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.
[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.
通讯机构:
[Tang, L; Zeng, GM] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
语种:
英文
关键词:
g-C3N4;Phosphorus doping;Pores and nanosheets;Cr(VI) reduction;2,4-Diclorophenol oxidation
期刊:
Applied Catalysis B: Environmental
ISSN:
0926-3373
年:
2017
卷:
203
页码:
343-354
基金类别:
National Program for Support of Top-Notch Young Professionals of China; National Natural Science Foundation of China [51579096, 51222805, 51521006, 51508175]; Program for New Century Excellent Talents in University from the Ministry of Education of China [NCET-11-0129]; Hunan Province Innovation Foundation for Postgraduate [CX2015B095]
机构署名:
本校为其他机构
院系归属:
资源环境学院
摘要:
Carbon nitride (g-C<inf>3</inf>N<inf>4</inf>) has attracted great attention for its wide applications in hydrogen evolution and photocatalytic degradation. In this study, phosphorus doped porous ultrathin carbon nitride nanosheets (PCN-S) were prepared successfully via the element doping and thermal exfoliation method. The prepared PCN-S was characterized by XRD, SEM, TEM, N<inf>2</inf>-adsorption-desorption measurement, FT-IR, XPS, UV&ndash;vis diffuse reflectance spectra, photoluminescence (PL), photocurrent response (I-t) and EIS. The results show that PCN-S owns regular crystal structure of g-C<inf>3</inf>N<inf>4</inf>, large specific surface areas and nanosheet structure with lots of in-plane pores on its surface, excellent chemical stability, and broad light response to the whole visible light region, which was attributed to the doping of phosphorus element. Under visible light irradiation, the photocatalytic reduction of Cr(VI) over different samples indicated that the P doping and porous nanosheet structure play an important role for the enhanced performance of PCN-S. The reason was that P element doping can broaden the visible light response region, and large specific surface areas from the porous nanosheet structure can provide quantities of active sites for the photocatalytic reaction. Then the detailed study on the PCN-S for simultaneous photocatalytic reduction of Cr(VI) and oxidation of 2,4-diclorophenol (2,4-DCP) was conducted. The experiments results show that low pH value and enough dissolved oxygen were found to promote Cr(VI) reduction and 2,4-DCP oxidation. The detailed photocatalytic mechanism was proposed. The strategies used in this study could provide new insight into the design of g-C<inf>3</inf>N<inf>4</inf>based materials with high photocatalytic activity, and present potential for the treatment of Cr(VI)/2,4-DCP or other mixed pollutants in wastewater. &copy;2016 Elsevier B.V.

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