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Super synergy between photocatalysis and ozonation using bulk g-C3N4 as catalyst: A potential sunlight/O-3/g-C3N4 method for efficient water decontamination
Xiao, Jiadong1,2; Xie, Yongbing1; Nawaz, Faheem1,2; Jin, Song1; Duan, Feng1,2; Li, Mingjie1; Cao, Hongbin1,3
2016-02-01
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume181Issue:FEBPages:420-428
AbstractThe recent thrust in utilizing g-C3N4 as a metal-free photocatalyst has led to accelerated attention in environmental decontamination. Despite of enormous efforts paid on material modification, the overall efficiency is still limited, especially for decomposition of chemically stable contaminants and mineralization of organics. Here, we coupled bulk g-C3N4 (GCN-T and GCN-D synthesized from thiourea and dicyandiamide, respectively) photocatalysis with ozonation for mineralization of oxalic acid (OA) and p-hydroxybenzoic acid (PHBA) under UV and visible-light irradiation. The compelling experiments confirmed that bulk g-C3N4 could trigger a super synergy between photocatalysis and ozonation under visible light. The apparent rate constant of OA removal by Vis/O-3/GCN-D was 20.6 times as great as the sum of that in Vis/GCN-D and ozonation. The TOC removal of PHBA by Vis/O-3/GCN-D was 98.0%, which was about 39.3% higher than the sum of that in Vis/GCN-D and ozonation. The high conduction band (CB) position of g-C3N4 proved to be crucial for the synergy between photocatalysis and ozonation. GCN-D possessed a similar to 0.10V upshifted CB level compared to GCN-T, resulting in a 1.30 times higher photocatalytic ozonation activity. More negative CB potential benefited photoinduced electron capture by ozone molecules, thus significantly enhanced charge separation as well as the decay of ozone eventually with generation of abundant hydroxyl radicals (center dot OH). Exceptionally, Vis/O-3/GCN-D exhibited stronger oxidizing ability than UV/O-3/GCN-D for OA degradation with the same light intensity. The reason was that the photolysis of ozone occurred under UV and partly inhibited ozone capturing photoinduced electrons. The amount of generated center dot OH thus decreased in UV/O-3/GCN-D instead with the formation of a few atomic oxygen species (O(D-1)). This study puts forward new application of the easily obtained bulk g-C3N4 and may drive the advance of sunlight/O-3/g-CsN4 method for efficient and green water decontamination using sunlight as energy source. (C) 2015 Elsevier B.V. All rights reserved.
KeywordBulk G-c3n4 Conduction Band Photocatalytic Ozonation Water Treatment
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.apcatb.2015.08.020
Indexed BySCI
Language英语
WOS KeywordGRAPHITIC CARBON NITRIDE ; VISIBLE-LIGHT IRRADIATION ; COMPOSITE PHOTOCATALYSTS ; WASTE-WATER ; OXALIC-ACID ; DEGRADATION ; PHOTOREACTIVITY ; OXIDATION ; HYBRID
WOS Research AreaChemistry ; Engineering
WOS SubjectChemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
Funding OrganizationNational Natural Science Foundation of China(21207133) ; National Science Fund for Distinguished Young Scholars of China(51425405) ; National Key Technology RD Program(2011BACO6B09)
WOS IDWOS:000364256000039
Citation statistics
Cited Times:62[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19777
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Chinese Acad Sci, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing Engn Res Ctr Proc Pollut Control, Key Lab Green Proc & Engn,Inst Proc Engn, 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
Recommended Citation
GB/T 7714
Xiao, Jiadong,Xie, Yongbing,Nawaz, Faheem,et al. Super synergy between photocatalysis and ozonation using bulk g-C3N4 as catalyst: A potential sunlight/O-3/g-C3N4 method for efficient water decontamination[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2016,181(FEB):420-428.
APA Xiao, Jiadong.,Xie, Yongbing.,Nawaz, Faheem.,Jin, Song.,Duan, Feng.,...&Cao, Hongbin.(2016).Super synergy between photocatalysis and ozonation using bulk g-C3N4 as catalyst: A potential sunlight/O-3/g-C3N4 method for efficient water decontamination.APPLIED CATALYSIS B-ENVIRONMENTAL,181(FEB),420-428.
MLA Xiao, Jiadong,et al."Super synergy between photocatalysis and ozonation using bulk g-C3N4 as catalyst: A potential sunlight/O-3/g-C3N4 method for efficient water decontamination".APPLIED CATALYSIS B-ENVIRONMENTAL 181.FEB(2016):420-428.
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