Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid

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

	Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid
	Du, Jingjing ; Jing, Chuanyong ; Duan, Jinming ; Zhang, Yongli ; Hu, Shan
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
	2014
卷号	26 期号:2 页码:240-247
关键词	arsenate humic acid HFO adsorption multiple spectroscopic techniques
ISSN号	1001-0742
中文摘要	Insights from the adverse effect of humic acid (HA) on arsenate removal with hydrous ferric oxide (HFO) coprecipitation can further our understanding of the fate of As(V) in water treatment process. The motivation of our study is to explore the competitive adsorption mechanisms of humic acid and As(V) on HFO on the molecular scale. Multiple complementary techniques were used including macroscopic adsorption experiments, surface enhanced Raman scattering (SERS), extended X-ray absorption fine structure (EXAFS) spectroscopy, flow-cell attenuated total reflectance Fourier transform infrared (ATR-FTIR) measurement, and charge distribution multisite complexation (CD-MUSIC) modeling. The As(V) removal efficiency was reduced from over 95% to about 10% with the increasing HA concentration to 25 times of As(V) mass concentration. The SERS analysis excluded the HA-As(V) complex formation. The EXAFS results indicate that As(V) formed bidentate binuclear surface complexes in the presence of HA as evidenced by an As-Fe distance of 3.26-3.31 angstrom. The in situ ATR-FTIR measurements show that As(V) replaces surface hydroxyl groups and forms inner-sphere complex. High concentrations of HA may physically block the surface sites and inhibit the As(V) access. The adsorption of As(V) and HA decreased the point of zero charge of HFO from 7.8 to 5.8 and 6.3, respectively. The CD-MUSIC model described the zeta potential curves and adsorption edges of As(V) and HA reasonably well.
WOS记录号	WOS:000331781900002
公开日期	2015-03-24
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/9444]
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	Du, Jingjing,Jing, Chuanyong,Duan, Jinming,et al. Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2014,26(2):240-247.
APA	Du, Jingjing,Jing, Chuanyong,Duan, Jinming,Zhang, Yongli,&Hu, Shan.(2014).Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,26(2),240-247.
MLA	Du, Jingjing,et al."Removal of arsenate with hydrous ferric oxide coprecipitation: Effect of humic acid".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 26.2(2014):240-247.