Effect of FeS Colloids on Desorption of As(Ⅴ)Adsorbed on Ferric Iron
Cheng Dong
Liao Peng
Yuan Songhu
Abstract：The iron colloids in groundwater are associated with contaminants such as arsenate in transport processes,but the mechanism underlying the process is not clear.In this study,batch static adsorption and desorption experiments were conduc-ted to investigate the effect of FeS colloids on desorption of As(Ⅴ)adsorbed on Fe2O3-coated sand,as well as the influences of HA,H2PO4 - and HCO3 - on the desorption.Results show that FeS colloids at low concentrations desorbed As (Ⅴ)mainly by competing adsorption sites on the surface of Fe2O3-sand,while desorption at high concentrations is mainly due to the competi-tive adsorption for As (Ⅴ)with Fe2O3-sand.As HA (humic acid),H2PO4 - and HCO3 - could desorb As (Ⅴ)from Fe2O3-sand,As (Ⅴ)desorption by FeS colloids was reduced.The results may better our understanding of the mechanisms of the arse-nate release from sediments into groundwater.
Keywords：FeS colloidssedimentAs(Ⅴ)groundwater
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 325-330 )