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	Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns
	Ma J.; Guo, H. M.; Lei, M.; Wan, X. M.; Zhang, H. Z.; Feng, X. J.; Wei, R. F.; Tian, L. Y.; Han, X. K.
	2016
关键词	Soil colloids Strong repulsion Arsenate Low adsorption Co-transport Blocking effect strongly sorbing contaminants natural porous-media facilitated transport ionic-strength hydroxyapatite nanoparticles oxide nanoparticles laboratory column escherichia-coli solute transport graphene oxide
英文摘要	Transport of environmental pollutants through porous media is influenced by colloids. Co-transport of As(V) and soil colloids at different pH were systematically investigated by monitoring breakthrough curves (BTCs) in saturated sand columns. A solute transport model was applied to characterize transport and retention sites of As(V) in saturated sand in the presence of soil colloids. A colloid transport model and the DLVO theory were used to reveal the mechanism and hypothesis of soil colloid-promoted As(V) transport in the columns. Results showed that rapid transport of soil colloids, regulated by pH and ionic strength, promoted As(V) transport by blocking As(V) adsorption onto sand, although soil colloids had low adsorption for As(V). The promoted transport was more significant at higher concentrations of soil colloids (between 25 mg L-1 and 150 mg L-1) due to greater blocking effect on As(V) adsorption onto the sand surfaces. The blocking effect of colloids was explained by the decreases in both instantaneous (equilibrium) As adsorption and first-order kinetic As adsorption on the sand surface sites. The discovery of this blocking effect improves our understanding of colloid-promoted As transport in saturated porous media, which provides new insights into role of colloids, especially colloids with low As adsorption capacity, in As transport and mobilization in soil-groundwater systems. (C) 2016 Elsevier Ltd. All rights reserved.
出处	Environmental Pollution
卷	213
页	638-647
语种	英语
ISSN号	0269-7491
DOI标识	10.1016/j.envpol.2016.03.020
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43132]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Ma J.,Guo, H. M.,Lei, M.,et al. Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns. 2016.

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