Arsenic mobilization in spent nZVI waste residue: Effect of Pantoea sp IMH

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

	Arsenic mobilization in spent nZVI waste residue: Effect of Pantoea sp IMH
	Ye, Li; Liu, Wenjing; Shi, Qiantao; Jing, Chuanyong
刊名	ENVIRONMENTAL POLLUTION
	2017-02-15
卷号	230 期号:0 页码:1081-1089
关键词	Arsenic Spent Nzvi Arsc Gene Bio-transformation Spectroscopy
英文摘要	Nanoscale zero-valent iron (nZVI) is an effective arsenic (As) scavenger. However, spent nZVI may pose a higher environmental risk than our initial thought in the presence of As-reducing bacteria. Therefore, our motivation was to explore the As redox transformation and release in spent nZVI waste residue in contact with Pantoea sp. IMH, an arsC gene container adopting the As detoxification pathway. Our incubation results showed that IMH preferentially reduce soluble As(V), not solid-bound As(V), and was innocent in elevating total dissolved As concentrations. mu-XRF and As mu-XANES spectra clearly revealed the heterogeneity and complexity of the inoculated and control samples. Nevertheless, the surface As local coordination was not affected by the presence of IMH as evidenced by similar As-Fe atomic distance (3.32 -3.36 angstrom) and coordination number (1.9) in control and inoculated samples. The Fe XANES results suggested that magnetite in nZVI residue was partly transformed to ferrihydrite, and the IMH activity slowed down the nZVI aging process. IMH distorted Fe local coordination without change its As adsorption capacity as suggested by Mossbauer spectroscopy. Arsenic retention is not inevitably enhanced by in situ formed secondary Fe minerals, but depends on the relative As affinity between the primary and secondary iron minerals. (C) 2017 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39250]
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	Ye, Li,Liu, Wenjing,Shi, Qiantao,et al. Arsenic mobilization in spent nZVI waste residue: Effect of Pantoea sp IMH[J]. ENVIRONMENTAL POLLUTION,2017,230(0):1081-1089.
APA	Ye, Li,Liu, Wenjing,Shi, Qiantao,&Jing, Chuanyong.(2017).Arsenic mobilization in spent nZVI waste residue: Effect of Pantoea sp IMH.ENVIRONMENTAL POLLUTION,230(0),1081-1089.
MLA	Ye, Li,et al."Arsenic mobilization in spent nZVI waste residue: Effect of Pantoea sp IMH".ENVIRONMENTAL POLLUTION 230.0(2017):1081-1089.