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Cu(II)-catalyzed THM formation during water chlorination and monochloramination: A comparison study
Fu, Jun; Qu, Jiuhui; Liu, Ruiping; Qiang, Zhimin; Liu, Huijuan; Zhao, Xu
2009-10-15
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
Volume170Issue:1Pages:58-65
AbstractThe catalytic effect of Cu(II) on trihalomethane (THM) formation during chlorination and monochloramination of humic acid (HA) containing water was comparatively investigated under various pH conditions. Results indicate that in the presence of Cu(II), the formation of THMs was significantly promoted as pH decreased in both chlorination and monochloramination. More THMs were formed during Cu(II)catalyzed monochloramination which was partially clue to enhanced hydroxyl radical ((center dot)OH) generation as demonstrated by electron spin resonance (ESR) analysis. To discriminate the reactive moieties of HA, nine model compounds,which approximately represented the chemical structure of HA,were individually oxidized by chlorine or monochloramine. Results show that Cu(II) could promote THM formation through reacting with citric acid and similar structures in HA. During chlorination and monochloramination of citric acid in the absence of Cu(II), major intermediates including chlorocarboxylic acid, chloroacetone and chloroacetic anhydride were identified. However. the catalysis of Cu(II) did not produce any new intermediate. The complexation of Cu(II) with model compounds was characterized via FTIR analysis. The reaction mechanism for Cu(II)-catalyzed THM formation was proposed to comprise two pathways: (1) indirect catalysis in which (center dot)OH oxidizes the large molecules of HA into small ones to enhance THM formation; and (2) direct catalysis in which Cu(II) complexes with HA to accelerate the decarboxylation steps for THM formation. (C) 2009 Elsevier B.V. All rights reserved.
Department环境水质学国家重点实验室
KeywordCu(Ii) Catalysis Chlorination Monochloramination Humic Acid Trihalomethane Reaction Mechanism
WOS IDWOS:000269162000009
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Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/21654
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Fu, Jun,Qu, Jiuhui,Liu, Ruiping,et al. Cu(II)-catalyzed THM formation during water chlorination and monochloramination: A comparison study[J]. JOURNAL OF HAZARDOUS MATERIALS,2009,170(1):58-65.
APA Fu, Jun,Qu, Jiuhui,Liu, Ruiping,Qiang, Zhimin,Liu, Huijuan,&Zhao, Xu.(2009).Cu(II)-catalyzed THM formation during water chlorination and monochloramination: A comparison study.JOURNAL OF HAZARDOUS MATERIALS,170(1),58-65.
MLA Fu, Jun,et al."Cu(II)-catalyzed THM formation during water chlorination and monochloramination: A comparison study".JOURNAL OF HAZARDOUS MATERIALS 170.1(2009):58-65.
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