Removal of As(V) and As(III) species from wastewater by adsorption on coal fly ash

doi:10.5004/dwt.2019.23764

	Removal of As(V) and As(III) species from wastewater by adsorption on coal fly ash
	Wang, Yulong 1,2; Wang, Shaofeng 2; Zhang, Guoqing 2; Wang, Xin 2; Zang, Shuyan 3; Jia, Yongfeng 2
刊名	DESALINATION AND WATER TREATMENT
	2019-05-01
卷号	151 页码:242-250
关键词	Arsenic Arsenate Arsenite Coal fly ash Adsorption Reuse
ISSN号	1944-3994
DOI	10.5004/dwt.2019.23764
英文摘要	Arsenic is ubiquitous in many natural systems and poses great risk to human health. Coal fly ash is a waste by-product of thermal power plants that may cause serious environmental problems. To reduce environmental hazards and realize high-value utilization of coal fly ash, it was characterized using the scanning electron microscopy, Brunauer-Emmet-Teller, and powder X-ray diffraction methods, and the arsenate (As(V)) and arsenite (As(III)) removal performance of coal fly ash used as an adsorbent from aqueous solutions was investigated using batch experiments. Adsorption kinetics study revealed that the adsorption of As(V) and As(III) by fly ash was fast in the first 4 h and equilibrium was achieved within 48 h at pH 5.0 with an initial arsenic concentration of 1 mg/L and an adsorbent dose of 4 g/L. The adsorption kinetics are well described by the pseudo-second-order rate equation model, with high coefficients of determination (R-2) of 0.9991 and 0.9925 for As(V) and As(III) adsorption, respectively. The Langmuir adsorption isotherms of arsenic adsorption indicated that the highest adsorption capacities of As(V) and As(III) at pH 5.0 were 666.67 and 232.56 mg/kg, respectively. The results of the arsenic adsorption edges conducted at different pH values from 3 to 11 with initial arsenic concentration of 1 mg/L and adsorbent dose of 4 g/L revealed that the removal of As(V) was obviously more than that of As(III) under the same conditions, with respect to the same pH. Different from the sharp maximum adsorption at pH around 5.0 on the As(V) adsorption edge, the As(III) adsorption maximum is broad, occurred in the pH range of approximately 5.0 to 7.0. The significant differences in the adsorption of As(V) and As(III) on fly ash could be due to the discrepant electrostatic interaction between Al-based hydroxyl groups on the surface of fly ash and arsenic species in aqueous solution. Furthermore, this approach provides a possible method for treating arsenic wastewater and potential application for the reuse of coal fly ash generated by other industrial activities.
资助项目	National Natural Science Foundation of China[41530643] ; National Natural Science Foundation of China[41807358] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB14020203]
WOS研究方向	Engineering ; Water Resources
语种	英语
出版者	DESALINATION PUBL
WOS记录号	WOS:000466109500025
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/124055]
专题	中国科学院沈阳应用生态研究所
通讯作者	Wang, Yulong; Wang, Shaofeng; Zang, Shuyan
作者单位	1.Henan Univ, Coll Environm & Planning, Key Lab Geospatial Technol Middle & Lower Yellow, Kaifeng 475004, Peoples R China 2.Chinese Acad Sci, Inst Appl Ecol, Key Lab Pollut Ecol & Environm Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China 3.Shenyang Univ Chem Technol, Shenyang 110142, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yulong,Wang, Shaofeng,Zhang, Guoqing,et al. Removal of As(V) and As(III) species from wastewater by adsorption on coal fly ash[J]. DESALINATION AND WATER TREATMENT,2019,151:242-250.
APA	Wang, Yulong,Wang, Shaofeng,Zhang, Guoqing,Wang, Xin,Zang, Shuyan,&Jia, Yongfeng.(2019).Removal of As(V) and As(III) species from wastewater by adsorption on coal fly ash.DESALINATION AND WATER TREATMENT,151,242-250.
MLA	Wang, Yulong,et al."Removal of As(V) and As(III) species from wastewater by adsorption on coal fly ash".DESALINATION AND WATER TREATMENT 151(2019):242-250.