Efficiency of transition metal modified akadama clay on cesium removal from aqueous solutions

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• 作者：Dahu Ding ; Zhongfang Lei ; Yingnan Yang ; Zhenya Zhang
• 关键词：Cesium adsorption ; Nickel ; Akadama clay
• 刊名：Chemical Engineering Journal
• 出版年：15 January, 2014
• 年：2014
• 卷：236
• 期：Complete
• 页码：17-28
• 全文大小：2532 K

文摘

The aim of this work is to develop an efficient adsorption material for cesium removal from aqueous solutions. A common and inexpensive andic soil, akadama clay (AC), was utilized in this study. In order to better its adsorption behavior, the AC was modified with nickel, a transition metal. Macropores and mesopores with diameter >20 nm in AC were transformed into smaller mesopores of diameter <12 nm after the modification. The maximum adsorption capacity increased from 4.5 卤 0.8 to 16.1 卤 0.9 mg g^鈭?. The applicable pH range (Cs⁺ removal >90%) was notably extended from pH > 11 to pH 猢?#xA0;5. Competitive ions had negative effects on the cesium adsorption especially K⁺ probably due to similar characteristics between K⁺ and Cs⁺. In addition, relatively high removal efficiency (about 85%) was achieved when the modified AC was used for lake water treatment. Desorption tests indicated that the adsorption process was relatively stable. Cs⁺ recycling could be realized by immersing the spent adsorbent into 0.1 M HCl or KCl solution for 24 h. The newly developed adsorbent is a promising efficient material for Cs⁺ adsorption from aqueous solution.