聚苯乙烯基Ce-La双金属氧化物对磷的吸附特性

来源：中国环境科学杂志2024年第11期北京时间：

作者：李含, 申萌萌, 楼冉, 陈嘉超, 陈志辉, 朱雅娴, 杨文澜

单位：1. 扬州大学环境科学与工程学院, 江苏 扬州 225127;2. 国能龙源催化剂江苏有限公司, 江苏 宜兴 214174

摘要：Ce-La bimetal oxides (CLBOs) nanoparticles were immobilized within the pores of a polystyrene anion exchanger (PAE) to fabricate a polystyrene-based nanocomposite CLBOs@PAE for efficient phosphate removal from acidic wastewater. Experimental results indicated that CLBOs@PAE exhibited excellent stability at pH≥3, and acidic conditions favor its adsorption of phosphate. At a pH of 4 and an initial phosphate concentration of 30mg/L, the maximum phosphate adsorption capacity reached 56.71mg/L. The phosphate adsorption process of CLBOs@PAE followed pseudo-second-order kinetics, achieving adsorption equilibrium within 180minutes. Benefiting from the preferential adsorption of embedded CLBOs nanoparticles towards phosphate (involving hydroxyl ligand exchange and inner-sphere complexation), CLBOs@PAE showed significant phosphate adsorption selectivity in the presence of high concentrations of coexisting anions (SO42-, HCO3-, NO3- and Cl-). Fixed-bed adsorption experiments demonstrated that at an influent phosphate concentration of 5mg/L, CLBOs@PAE exhibited an effective treatment capacity of up to 5000BV before reaching the breakthrough point (0.5mg/L). Moreover, CLBOs@PAE displayed excellent desorption and regeneration properties, maintaining a relatively stable adsorption capacity over long-term cyclic use, highlighting its promising potential for phosphate removal in acidic wastewater treatment.

关键词：阴离子交换树脂,Ce-La双金属氧化物,磷,酸性废水,高效去除

基金资助：国家自然科学基金资助面上项目(52070160);江苏省重点研发计划社会发展项目(BE2023751);扬州大学高端人才支持计划项目;宜兴市“陶都英才”创新创业人才项目(CX202011C);宜兴市科技创新专项资金资助重点研发项目(Y2022002);江苏省大学生创新创业训练计划项目(X20220563)