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Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study
Hu, Shan; Yan, Wei; Duan, Jinming
2015-03-20
Source PublicationCOLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume469Issue:1Pages:180-186
AbstractThe exposure risks of toxic arsenic in the environment are dependent on the adsorption and desorption processes at solid/aqueous interfaces, which could be greatly influenced by co-existing oxyanions such as silicate. In the present work, the adsorption of arsenate [As(V)], silicate (Si), and the influence of silicate on As(V) adsorption are investigated at the molecular level by in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. Silicate monomer, dimer, oligomer, and polymer were detected on the TiO2 surface after 3 h, and silicate oligomer was the predominant surface species under the experimental conditions. The presence of silicate with different silicate and As(V) adsorption sequences did not interfere with As(V) surface species on TiO2, but only affected the As(V) adsorption capacity. For silicate, the adsorption of As(V) could greatly inhibit the formation of Si monomer and dimer on TiO2, but the silicate oligomer and polymer were not influenced by As(V) adsorption. The silicate oligomeric and polymeric surface species will gradually occupy the TiO2 surface sites to inhibit As adsorption and TiO2 regeneration. Our findings provide spectroscopic evidence and clearly elucidate the molecular-level interactions of silicate and As(V) on TiO2, which will further our understanding of the removal of As in groundwater. (C) 2015 Elsevier B.V. All rights reserved.
Department环境化学与生态毒理学国家重点实验室
KeywordArsenate Silicate Tio2 Atr-ftir Spectroscopy Competitive Adsorption
WOS Research AreaChemistry, Physical
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Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/32648
Collection环境化学与生态毒理学国家重点实验室
Recommended Citation
GB/T 7714
Hu, Shan,Yan, Wei,Duan, Jinming. Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2015,469(1):180-186.
APA Hu, Shan,Yan, Wei,&Duan, Jinming.(2015).Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,469(1),180-186.
MLA Hu, Shan,et al."Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 469.1(2015):180-186.
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