Mechanistic insight and rapid co-adsorption of nitrogen pollution from micro-polluted water over MgAl-layered double hydroxide composite based on zeolite

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
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:297: 121484-121484 被引量:27
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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