Is C3N4 Chemically Stable toward Reactive Oxygen Species in Sunlight-Driven Water Treatment?
Xiao, Jiadong1,2; Han, Qingzhen1; Xie, Yongbing1; Yang, Jin1; Su, Qaozhi1; Chen, Yue1; Cao, Hongbin1
2017-11-21
发表期刊ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
卷号51期号:22页码:13380-13387
摘要

Reactive oxygen species (ROS) are key oxidants for the degradation of organic pollutants in sunlight-driven photocatalytic water treatment, but their interaction with the photocatalyst is easily ignored and, hence, is comparatively poorly understood. Here we show that graphitic carbon nitride (C3N4, a famous visible-light-responsive photocatalyst) is chemically stable toward ozone and superoxide radical; in contrast, hydroxyl radical ((OH)-O-center dot) can tear the heptazine unit directly from C3N4 to form cyameluric acid and further release nitrates into the aqueous environment. The ratios of released nitrogen from nanosheet-structured C3N4 and bulk C3N4 that finally exists in the form of NO3- reach 9.5 and 6.8 mol % in initially ultrapure water, respectively, after 10 h treatment by solar photocatalytic ozonation, which can rapidly generate abundant (OH)-O-center dot to attack C3N4. On a positive note, in the presence of organic pollutants which compete against C3N4 for (OH)-O-center dot, the C3N4 decomposition has been completely or partially blocked; therefore, the stability of C3N4 under practical working conditions has been obviously preserved. This work supplements the missing knowledge of the chemical instability of C3N4 toward (OH)-O-center dot and calls for attention to the potential deactivation and secondary pollution of catalysts in (OH)-O-center dot involved water treatment processes.

文章类型Article
WOS标题词Science & Technology ; Technology ; Life Sciences & Biomedicine
DOI10.1021/acs.est.7b04215
收录类别SCI
语种英语
关键词[WOS]GRAPHITIC CARBON NITRIDE ; VISIBLE-LIGHT ; GRAPHENE OXIDE ; G-C3N4 ; OXIDATION ; PHOTOCATALYSIS ; NANOPARTICLES ; DEGRADATION ; PERFORMANCE ; CHEMISTRY
WOS研究方向Engineering ; Environmental Sciences & Ecology
WOS类目Engineering, Environmental ; Environmental Sciences
项目资助者Natural Science Foundation of Beijing Municipality(8172043) ; National Science Fund for Distinguished Young Scholars of China(51425405)
WOS记录号WOS:000416496700037
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/23438
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, Div Environm Technol & Engn, Beijing Engn Res Ctr Proc Pollut Control, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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Xiao, Jiadong,Han, Qingzhen,Xie, Yongbing,et al. Is C3N4 Chemically Stable toward Reactive Oxygen Species in Sunlight-Driven Water Treatment?[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017,51(22):13380-13387.
APA Xiao, Jiadong.,Han, Qingzhen.,Xie, Yongbing.,Yang, Jin.,Su, Qaozhi.,...&Cao, Hongbin.(2017).Is C3N4 Chemically Stable toward Reactive Oxygen Species in Sunlight-Driven Water Treatment?.ENVIRONMENTAL SCIENCE & TECHNOLOGY,51(22),13380-13387.
MLA Xiao, Jiadong,et al."Is C3N4 Chemically Stable toward Reactive Oxygen Species in Sunlight-Driven Water Treatment?".ENVIRONMENTAL SCIENCE & TECHNOLOGY 51.22(2017):13380-13387.
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