Dramatic coupling of visible light with ozone on honeycomb-like porous g-C3N4 towards superior oxidation of water pollutants
Xiao, Jiadong1,2; Xie, Yongbing1; Nawaz, Faheem1,2; Wang, Yuxian1; Du, Penghui1,2; Cao, Hongbin1,3
2016-04-01
发表期刊APPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
卷号183期号:APR页码:417-425
摘要Porous g-C3N4 (PGCN) has attracted enormous attention due to its accessible nanoporous framework benefiting photocatalytic reactions. Here, we reported a one-pot template-free method to fabricate honeycomb-like PGCN by simply mixing ammonia chloride with the precursor of g-C3N4 before calcination. The resulting PGCN exhibited obviously improved photocatalytic activity for p-hydroxybenzoic acid (PHBA) degradation under visible light due to its high surface area and enlarged band gap, but PHBA can hardly be mineralized in this process. Hence, for the first time, Vis/PGCN was coupled with ozone in this paper and the results showed that PGCN could trigger a vigorous synergy between photocatalysis and ozonation. Vis/O-3/PGCN led to almost complete mineralization of PHBA with an ozone dosage of 1.5 mg/min, and the process could be further accelerated by increasing the ozone dosage. Such a remarkable mineralization enhancement was mainly attributed to the systematically promoted generation of non-selective hydroxyl radicals ((OH)-O-center dot). The high CB level of PGCN benefited electron capture by ozone molecules, thus significantly enhanced charge separation and the decay of ozone into abundant (OH)-O-center dot. (OH)-O-center dot could vigorously react with PHBA and its ozone-recalcitrant intermediates such as the identified carboxylic acids, finally leading to thorough mineralization. Electrospray ionization-mass spectrometry was adopted to detect the evolution of degradation intermediates in ozonation and Vis/O-3/PGCN, and the mineralization procedure from the original PHBA to CO2 and H2O was comprehensively proposed. This study contributes to the integration of sunlight/PGCN with ozone as an efficient metal-free advanced oxidation process for water treatment. (C) 2015 Elsevier B.V. All rights reserved.
关键词Porous G-c3n4 Photocatalytic Ozonation Intermediates Mechanism Water Treatment
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1016/j.apcatb.2015.11.010
收录类别SCI
语种英语
关键词[WOS]CARBON NITRIDE SEMICONDUCTORS ; P-HYDROXYBENZOIC ACID ; PHOTOCATALYTIC OZONATION ; HYDROGEN PHOTOSYNTHESIS ; TIO2 NANOPARTICLES ; DEGRADATION ; EFFICIENT ; IRRADIATION ; HYBRID ; PHOTOACTIVITY
WOS研究方向Chemistry ; Engineering
WOS类目Chemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
项目资助者National Natural Science Foundation of China(21207133) ; National Science Fund for Distinguished Young Scholars of China(51425405)
WOS记录号WOS:000367106200046
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/20197
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, Beijing Engn Res Ctr Proc Pollut Control, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol,Key L, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
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Xiao, Jiadong,Xie, Yongbing,Nawaz, Faheem,et al. Dramatic coupling of visible light with ozone on honeycomb-like porous g-C3N4 towards superior oxidation of water pollutants[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2016,183(APR):417-425.
APA Xiao, Jiadong,Xie, Yongbing,Nawaz, Faheem,Wang, Yuxian,Du, Penghui,&Cao, Hongbin.(2016).Dramatic coupling of visible light with ozone on honeycomb-like porous g-C3N4 towards superior oxidation of water pollutants.APPLIED CATALYSIS B-ENVIRONMENTAL,183(APR),417-425.
MLA Xiao, Jiadong,et al."Dramatic coupling of visible light with ozone on honeycomb-like porous g-C3N4 towards superior oxidation of water pollutants".APPLIED CATALYSIS B-ENVIRONMENTAL 183.APR(2016):417-425.
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