吸附
沸石
氢氧化物
吸附
化学
氢氧化铵
无机化学
离子交换
复合数
环境污染
解吸
化学工程
材料科学
催化作用
离子
有机化学
复合材料
环境保护
环境科学
工程类
作者
Yan Li,Mengfan Wu,Jiang‐Nan Wu,Yanqu Wang,Zhongjian Zheng,Zhuwu Jiang
标识
DOI:10.1016/j.seppur.2022.121484
摘要
Layered double hydroxide composites for water treatment have been widely studied for their advantages of high adsorption capacity, stability, and reusability. However, little is known about the co-adsorption potential and mechanism of these composites for ammonium and nitrate. In this study, based on the Box-Behnken response surface optimization design, the MgAl-layered double [email protected] ([email protected]) composite that can rapidly co-adsorption ammonium and nitrate was synthesized via a two-step modification method. The co-adsorption process quickly reached equilibrium within 10–30 min and achieved over 80% efficiency in the initial 3 min. Besides, the [email protected] showed a low pH dependence in a wide pH range (4–8). The physico-chemical structure of [email protected] was characterized, and on this basis, the effects of pH, dosage, and coexisting ions on co-adsorption were investigated. Ion exchange, electrostatic attraction, hydrophobic sorption, and metal-bonded bridges contributed substantially to the immobilization. The ions competition simulation experiments and five regenerative cycle experiments adequately demonstrated the high selective adsorption ability and recyclability of the [email protected] In addition, the adsorption efficiency of ammonium and nitrate in natural river water were both above 97.62%, which further confirming the application potential of the [email protected] Overall, this work presents a new multifunctional adsorbent for nitrogen removal in the micro-polluted source water.
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