Simultaneous removal of arsenate and fluoride by iron and aluminum binary oxide: Competitive adsorption effects

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• 作者：Ruiping Liu^a ; Wenxin Gong^a ; ^b ; Huachun Lan^a ; ^b ; Tianming Yang^a ; Huijuan Liu^a ; Jiuhui Qu^a ; ^{jhqu@rcees.ac.cn}
• 关键词：Arsenate ; Fluoride ; Competitive adsorption ; Iron and aluminum binary oxide ; Simultaneous removal
• 刊名：Separation and Purification Technology
• 出版年：2012
• 期刊代码：78_13835866
• 类别：ce
• 出版时间：18 May, 2012
• 卷：92
• 期：Complete
• 页码：100-105
• 文件大小：368 K

摘要

This study proposes the use of iron and aluminum binary oxide (FeAlO_xH_y) to achieve the simultaneous removal of arsenate [As(V)] and F, and the competitive adsorption between As(V) and F are investigated. Iron oxyhydroxide (FeO_xH_y) shows a high removal capability towards As(V) but exhibits little efficacy to remove F in systems where both As(V) and F co-exist or for solutions of fluoride alone. The introduction of aluminum oxyhydroxide (AlO_xH_y) to FeO_xH_y within FeAlO_xH_y enables the removal of F as well as As(V). AlO_xH_y may simultaneously remove As(V) and F over a wide pH range from 4 to 11; however, the removal of As(V) and F is highly pH dependent and the maximum removal is observed at the weakly acidic pH of 6. The electrostatic force at different pH plays a role, but the dissolution of AlO_xH_y dominates in the lower removal of As(V) and F by AlO_xH_y especially at low pH. Furthermore, the removal of As(V) and F by AlO_xH_y in the co-existing system is lower than that in single pollutant systems due to competitive adsorption effects. The introduction of FeO_xH_y to AlO_xH_y significantly alleviates the effect of pH on the removal of As(V) and F by AlO_xH_y; moreover, the adverse effects of competitive adsorption between As(V) and F are inhibited to a large extent. In comparison to FeO_xH_y and AlO_xH_y, FeAlO_xH_y shows superior performance in achieving the simultaneous removal of As(V) and F and may be used to treat water containing both As and F.