摘要
The adsorption characteristics of arsenate on ion exchange fiber(IEF) and iron-modified ion exchange fiber(FeIEF) were evaluated.Batch adsorption experiments were conducted to study the arsenate adsorption effect by varying contact time,pH,and coexisting anions.Adsorption capacity was found to increase by increasing the contact time and acidic conditions were favorable for arsenate adsorption on IEF and Fe-IEF.Arsenate adsorption data were better consistent with Freundlich equation than Langmuir equation.The maximum monolayer adsorption capacities were 285 and 333 mg/g at 25℃ for IEF and Fe-IEF respectively.The adsorption kinetics was found to follow the pseudo-first-order kinetic model.The existence of HCO 3-,PO34-,SO24-,SiO23-,and NO 3-decreased the arsenate adsorption capacity on IEF.Cl-and F-had little influence on it.When FeIEF was adopted,the effects of HCO 3-,SO24-,Cl-,SiO23-,and NO 3-were negligible,while PO43-could still markedly decrease the adsorption capacity and F-had inhibitory effect on arsenate adsorption.Fe-IEF can be used as a highly selective and efficient sorbent for removal of arsenate from aqueous solutions.
The adsorption characteristics of arsenate on ion exchange fiber（IEF） and iron-modified ion exchange fiber（FeIEF） were evaluated.Batch adsorption experiments were conducted to study the arsenate adsorption effect by varying contact time,pH,and coexisting anions.Adsorption capacity was found to increase by increasing the contact time and acidic conditions were favorable for arsenate adsorption on IEF and Fe-IEF.Arsenate adsorption data were better consistent with Freundlich equation than Langmuir equation.The maximum monolayer adsorption capacities were 285 and 333 mg/g at 25℃ for IEF and Fe-IEF respectively.The adsorption kinetics was found to follow the pseudo-first-order kinetic model.The existence of HCO 3-,PO34-,SO24-,SiO23-,and NO 3-decreased the arsenate adsorption capacity on IEF.Cl-and F-had little influence on it.When FeIEF was adopted,the effects of HCO 3-,SO24-,Cl-,SiO23-,and NO 3-were negligible,while PO43-could still markedly decrease the adsorption capacity and F-had inhibitory effect on arsenate adsorption.Fe-IEF can be used as a highly selective and efficient sorbent for removal of arsenate from aqueous solutions.
