气候变化领域集成服务门户(CCPortal): Formation of active Fe(OH)(3) in situ for enhancing arsenic removal from water by the oxidation of Fe(II) in air with the presence of CaCO3

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DOI	10.1016/j.jclepro.2019.04.199
	Formation of active Fe(OH)(3) in situ for enhancing arsenic removal from water by the oxidation of Fe(II) in air with the presence of CaCO3
	Zhang, Tingting; Zhao, Yunliang; Kang, Shichang; Li, Yujie; Zhang, Qiwu
发表日期	2019
ISSN	0959-6526
EISSN	1879-1786
卷号	227
英文摘要	The wide-spread arsenic contamination is considered one of the most global serious environmental issues in the world. In this work, enhanced arsenic removal from water by the oxidation of FeSO4 with CaCO3 in air was investigated and the mechanisms were discussed. Oxidation of Fe(II) into Fe(OH)(3) in air became possible in the presence of CaCO3, of which the hydrolyzed OH- from CaCO3 changed the conversion route of Fe(II) to Fe(OH)(3). Freshly generated Fe(OH)(3) in situ presented high activity for arsenic removal, with Fe/As molar ratio at 2 giving the removal rate of 99.93% and low remaining concentration of 0.035 mg/L from 50 mg/L initial concentration. Precipitation products were characterized by a set of analytical methods including XRD, XPS and Raman analyses to confirm the existence of ferric arsenate phase. Different from using Ca(OH)(2) with enough OH- group, the slow hydrolysis of CaCO3 resulted in a continuous generation of fresh Fe(OH)(3) for arsenate precipitation and could avoid its rapid transformation into stable FeOOH of large particle size to lose the activity. Aging the ferric compositions by prolonged agitation of Fe(II) and CaCO3 before with arsenate solution confirmed the growth of FeOOH and resulted in a rapid decrease in the capacity for arsenic removal. The observed phenomena were interpreted based on the difference between the precipitation by fresh Fe(OH)(3) and the adsorption by large crystalline particles of FeOOH. Controlling the forming speed of ferric composition from Fe(II) with the addition of solid CaCO3 to maintain a fresh state as an easy operation could enhance tremendously its efficiency for As removal, with the ever highest capacity of 248 mg/g among iron absorbents. (C) 2019 Elsevier Ltd. All rights reserved.
关键词	Water pollution Arsenic removal Calcium carbonate Ferric hydroxide Oxidation of ferrous iron
学科领域	Science & Technology - Other Topics; Engineering; Environmental Sciences & Ecology
语种	英语
WOS研究方向	Green & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences
来源期刊	JOURNAL OF CLEANER PRODUCTION
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/112024
作者单位	Wuhan Univ Technol, Sch Resources & Environm Engn, Luoshi Rd 122, Wuhan 430070, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Tingting,Zhao, Yunliang,Kang, Shichang,et al. Formation of active Fe(OH)(3) in situ for enhancing arsenic removal from water by the oxidation of Fe(II) in air with the presence of CaCO3[J]. 中国科学院西北生态环境资源研究院,2019,227.
APA	Zhang, Tingting,Zhao, Yunliang,Kang, Shichang,Li, Yujie,&Zhang, Qiwu.(2019).Formation of active Fe(OH)(3) in situ for enhancing arsenic removal from water by the oxidation of Fe(II) in air with the presence of CaCO3.JOURNAL OF CLEANER PRODUCTION,227.
MLA	Zhang, Tingting,et al."Formation of active Fe(OH)(3) in situ for enhancing arsenic removal from water by the oxidation of Fe(II) in air with the presence of CaCO3".JOURNAL OF CLEANER PRODUCTION 227(2019).