标题：Individual and competitive adsorption of Cr(VI) and phosphate onto synthetic Fe-Al hydroxides
作者：Wang, Xin-Hua; Liu, Fei-Fei; Lu, Lei; Yang, Sen; Zhao, Yu; Sun, Lin-Bio; Wang, Shu-Guang
作者机构：[Wang, Xin-Hua; Liu, Fei-Fei; Lu, Lei; Yang, Sen; Zhao, Yu; Wang, Shu-Guang] Shandong Univ, Sch Environm Sci & Engn, Shandong Prov Key Lab Water Pollu 更多
通讯作者地址：[Wang, SG]Shandong Univ, Sch Environm Sci & Engn, Shandong Prov Key Lab Water Pollut Control & Reso, Jinan 250100, Peoples R China.
来源：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
关键词：Fe-Al hydroxides; Cr(VI); P; Adsorption; Individual; Competitive
摘要：Individual and competitive adsorption characteristics of Cr(VI) and phosphate (P) onto synthetic Fe-Al hydroxides were investigated. A series of batch experiments were performed to study the influence of various experimental parameters (pH, ionic strength and contact time) on Cr(VI) and P adsorption. Removal efficiency of Cr(VI) and P decreased with increasing pH and ionic strength. In individual adsorption tests, pseudo-second-order kinetic and Langmuir isotherm models could better describe Cr(VI) and P adsorption on Fe-Al hydroxides. In competitive adsorption experiments, Cr(VI) adsorption was suppressed obviously by P and followed Freundlich isotherm model, revealing that the competitive adsorption of Cr(VI) in the presence of P was heterogeneous. Cr(VI) had no significant influence on P adsorption and the competitive adsorption of P agreed well with Langmuir isotherm model, suggesting that the competitive affinity of P towards the adsorption sites on Fe-Al hydroxides was stronger than that of Cr(VI). The presence of P reduced the adsorption amount of Cr(VI), but the presence of Cr(VI) decreased the adsorption rate of P. (C) 2013 Elsevier B.V. All rights reserved.