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Reaction mechanism and metal ion transformation in photocatalytic ozonation of phenol and oxalic acid with Ag+/TiO2
Alternative TitleJ. Environ. Sci.
Chen, Yingying1,2,4; Xie, Yongbing1,2; Yang, Jun3; Cao, Hongbin1,2; Zhang, Yi1,2
2014-03-01
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
ISSN1001-0742
Volume26Issue:3Pages:662-672
AbstractPhotocatalytic ozonation of phenol and oxalic acid (OA) was conducted with a Ag+/TiO2 catalyst and different pathways were found for the degradation of different compounds. Ag+ greatly promoted the photocatalytic degradation of contaminants due to its role as an electron scavenger It also accelerated the removal rate of OA in ozonation and the simultaneous process for its complex reaction with oxalate. Phenol could be degraded both in direct ozonation and photolysis, but the TOC removal rates were much higher in the simultaneous processes due to the oxidation of hydroxyl radicals resulting from synergetic effects. The sequence of photo-illumination and ozone exposure in the combined process showed quite different effects in phenol degradation and TOC removal. The synergetic effects in different combined processes were found to be highly related to the properties of the target pollutants. The color change of the solution and TEM result confirmed that Ag+ was easily reduced and deposited on the surface of TiO2 under photo-illumination, and dissolved again into solution in the presence of ozone. This simple cycle of enrichment and distribution of Ag+ can greatly benefit the design of advanced oxidation processes, in which the sequences of ozone and photo-illumination can be varied according to the needs for catalyst recycling and the different properties of pollutants.; Photocatalytic ozonation of phenol and oxalic acid (OA) was conducted with a Ag+/TiO2 catalyst and different pathways were found for the degradation of different compounds. Ag+ greatly promoted the photocatalytic degradation of contaminants due to its role as an electron scavenger It also accelerated the removal rate of OA in ozonation and the simultaneous process for its complex reaction with oxalate. Phenol could be degraded both in direct ozonation and photolysis, but the TOC removal rates were much higher in the simultaneous processes due to the oxidation of hydroxyl radicals resulting from synergetic effects. The sequence of photo-illumination and ozone exposure in the combined process showed quite different effects in phenol degradation and TOC removal. The synergetic effects in different combined processes were found to be highly related to the properties of the target pollutants. The color change of the solution and TEM result confirmed that Ag+ was easily reduced and deposited on the surface of TiO2 under photo-illumination, and dissolved again into solution in the presence of ozone. This simple cycle of enrichment and distribution of Ag+ can greatly benefit the design of advanced oxidation processes, in which the sequences of ozone and photo-illumination can be varied according to the needs for catalyst recycling and the different properties of pollutants.
KeywordPhotocatalytic Ozonation Phenol Oxalic Acid ag+/tio2
SubtypeArticle
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.1016/S1001-0742(13)60445-3
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCATALYTIC OZONATION ; AQUEOUS-SOLUTIONS ; WATER-TREATMENT ; OZONE ; DEGRADATION ; TIO2 ; CARBON ; MINERALIZATION ; DECOMPOSITION ; TECHNOLOGIES
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000333447000021
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/8184
Collection研究所(批量导入)
Affiliation1.Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Chen, Yingying,Xie, Yongbing,Yang, Jun,et al. Reaction mechanism and metal ion transformation in photocatalytic ozonation of phenol and oxalic acid with Ag+/TiO2[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2014,26(3):662-672.
APA Chen, Yingying,Xie, Yongbing,Yang, Jun,Cao, Hongbin,&Zhang, Yi.(2014).Reaction mechanism and metal ion transformation in photocatalytic ozonation of phenol and oxalic acid with Ag+/TiO2.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,26(3),662-672.
MLA Chen, Yingying,et al."Reaction mechanism and metal ion transformation in photocatalytic ozonation of phenol and oxalic acid with Ag+/TiO2".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 26.3(2014):662-672.
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