Reduction of adsorbed As(V) on nano-TiO2 by sulfate-reducing bacteria

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Reduction of adsorbed As(V) on nano-TiO2 by sulfate-reducing bacteria
	Luo, Ting; Ye, Li; Ding, Cheng; Yan, Jinlong; Jing, Chuanyong
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2017-07-01
卷号	598 期号:0 页码:839-846
关键词	Surface-bound Arsenate Reducing Condition Arsenate Desorption Ftir Sulfate-reducing Bacteria
英文摘要	Reduction of surface-bound arsenate [As(V)] and subsequent release into the aqueous phase contribute to elevated As in groundwater. However, this natural process is not fully understood, especially in the presence of sulfate reducing bacteria (SRB). Gaining mechanistic insights into solid-As(V)-SRB interactions motivated our molecular level study on the fate of nano-TiO2 bound As(V) in the presence of Desulfovibrio vulgaris DP4, a strain of SRB, using incubation and in situ ATR-FTIR experiments. The incubation results clearly revealed the reduction of As(V), either adsorbed on nano-TiO2 or dissolved, in the presence of SRB. In contrast, this As(V) reduction was not observed in abiotic control experiments where sulfide was used as the reductant. Moreover, the reduction was faster for surface-bound As(V) than for dissolved As(V), as evidenced by the appearance of As(III) at 45 h and 75 h, respectively. ATR-FTIR results provided direct evidence that the surface-bound As(V) was reduced to As(III) on TiO2 surfaces in the presence of SRB. In addition, the As(V) desorption from nano-TiO2 was promoted by SRB relative to abiotic sulfide, due to the competition between As(V) and bacterial phosphate groups for TiO2 surface sites. This competition was corroborated by the ATR-FTIR analysis, which showed inner-sphere surface complex formation by bacterial phosphate groups on TiO2 surfaces. The results from this study highlight the importance of indirect bacteria-mediated As(V) reduction and release in geochemical systems. (C) 2017 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39401]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Luo, Ting,Ye, Li,Ding, Cheng,et al. Reduction of adsorbed As(V) on nano-TiO2 by sulfate-reducing bacteria[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2017,598(0):839-846.
APA	Luo, Ting,Ye, Li,Ding, Cheng,Yan, Jinlong,&Jing, Chuanyong.(2017).Reduction of adsorbed As(V) on nano-TiO2 by sulfate-reducing bacteria.SCIENCE OF THE TOTAL ENVIRONMENT,598(0),839-846.
MLA	Luo, Ting,et al."Reduction of adsorbed As(V) on nano-TiO2 by sulfate-reducing bacteria".SCIENCE OF THE TOTAL ENVIRONMENT 598.0(2017):839-846.