聚苯乙烯基Ce-La双金属氧化物对磷的吸附特性  

Adsorption characteristics of polystyrene-based Ce-La bimetal oxides for phosphate

作　　者：李含 申萌萌 楼冉 陈嘉超 陈志辉 朱雅娴 杨文澜[1] LI Han;SHEN Meng-meng;LOU Ran;CHEN Jia-chao;CHEN Zhi-hui;ZHU Ya-xian;YANG Wen-lan(School of the Environmental Science and Engineering,Yangzhou University,Yangzhou 225127,China;China Energy Longyuan Catalyst Jiangsu Co.,LTD.,Yixing 214174,China)

机构地区：[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

出　　处：《中国环境科学》2024年第11期6201-6209,共9页China Environmental Science

基　　金：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)。

摘　　要：采用铈/镧离子预负载—原位沉积的技术,将Ce-La双金属氧化物(CLBOs)纳米颗粒固载入聚苯乙烯阴离子交换树脂(PAE)孔道内,制备复合纳米吸附剂CLBOs@PAE,并考察了其对酸性废水中磷的吸附特性与机制.实验结果表明,在pH值≥3的条件下CLBOs@PAE具有优异的稳定性,且酸性环境有利于其对磷的吸附;在pH值=4、初始磷浓度为30mg/L的条件下,其最大磷吸附量可达56.71mg/g.CLBOs@PAE吸附除磷过程符合准二级动力学,且在180min内即可达到吸附平衡.由于负载的CLBOs纳米颗粒对磷酸盐具有特异性吸附能力(包括羟基配体交换和内配位络合等吸附机制),CLBOs@PAE在高浓度离子(SO_(4)^(2-)、HCO_(3)^(-)、NO_(3)^-、Cl^-)共存情况下表现出良好的选择性除磷性能.固定床吸附实验表明,在进水磷浓度为5mg/L的条件下,CLBOs@PAE在达到穿透点(0.5mg/L)前有效处理能力可高达5000BV.此外,CLBOs@PAE具有良好的脱附再生性能,长期循环使用其吸附量保持相对稳定,在酸性废水除磷领域展现出较好的应用前景.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(SO_(4)^(2-)-,HCO_(3)^(-),NO_(3)^(-)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 

分 类 号：X703.5[环境科学与工程—环境工程]