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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
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume51Issue:22Pages:13380-13387
Abstract

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.

SubtypeArticle
WOS HeadingsScience & Technology ; Technology ; Life Sciences & Biomedicine
DOI10.1021/acs.est.7b04215
Indexed BySCI
Language英语
WOS KeywordGRAPHITIC CARBON NITRIDE ; VISIBLE-LIGHT ; GRAPHENE OXIDE ; G-C3N4 ; OXIDATION ; PHOTOCATALYSIS ; NANOPARTICLES ; DEGRADATION ; PERFORMANCE ; CHEMISTRY
WOS Research AreaEngineering ; Environmental Sciences & Ecology
WOS SubjectEngineering, Environmental ; Environmental Sciences
Funding OrganizationNatural Science Foundation of Beijing Municipality(8172043) ; National Science Fund for Distinguished Young Scholars of China(51425405)
WOS IDWOS:000416496700037
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/23438
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.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
Recommended Citation
GB/T 7714
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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