纳米水合氧化铈的制备及其对酸性废水中Pb^(2+)的吸附特性研究  

Preparation of nano hydrated cerium oxide and its adsorption properties for Pb 2+in acidic wastewater

作　　者：陈嘉超 陈志辉 朱雅娴 许海民 杜玉洁 徐浩元 杨文澜[1] CHEN Jia-chao;CHEN Zhi-hui;ZHU Ya-xian;XU Hai-min;DU Yu-jie;XU Hao-yuan;YANG Wen-lan(College of Environmental Science and Engineering,Yangzhou University,Yangzhou 225127,China;Jiangsu Qichuang Environmental Science and Technology Corporation Co.,Ltd.,Yixing 214264,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]江苏启创环境科技股份有限公司,江苏宜兴214264

出　　处：《现代化工》2025年第4期124-129,共6页Modern Chemical Industry

基　　金：国家自然科学基金面上项目(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;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重点研发项目(Y2022002)。

摘　　要：采用液相沉淀法成功制备了具有高比表面积(243.5 m^(2)/g)的水合氧化铈纳米吸附剂(HCO),研究了HCO对酸性废水中Pb^(2+)的去除特性。结果表明,HCO以纳米颗粒和纳米团簇(20~50 nm)的形态存在,且在3~7的pH区间内表现出优异的化学稳定性;HCO在pH为5~6的条件下对Pb^(2+)的去除性能最佳,通过静电吸引和内配位络合的综合作用,在高浓度的共存离子体系中实现Pb^(2+)的选择性吸附。HCO对Pb^(2+)的吸附动力学研究结果表明,该过程与准二级动力学模型相吻合,且在180 min内达到吸附平衡。酸性NaNO_(3)溶液能够有效再生吸附饱和的HCO,且再生后HCO的吸附效率未见明显衰减,具备长期循环利用的潜力,是酸性废水深度除铅的理想吸附材料。A hydrated cerium oxide(HCO)nano-adsorbent with a high specific surface area(243.5 m^(2)·g^(-1))is prepared through a liquid phase precipitation method,and its characteristics in removing Pb^(2+)from acidic wastewater is studied.Experimental results reveal that HCO primarily exists in the forms of nano-scale particles and clusters with size ranging from 20 nm to 50 nm,exhibiting excellent chemical stability within a pH range of 3-7.The optimal performance of HCO for removing Pb^(2+)is observed at pH=5-6,which can be attributed to a synergistic effect between electrostatic attraction and inner coordination complexation,achieving selective adsorption of Pb^(2+)even in the presence of coexisting ions with high concentration.The adsorption process follows a pseudo-second-order kinetic model,with an equilibrium time of 180 min.Efficient regeneration of saturated HCO adsorbent is achieved by using acidic NaNO3 solution,without significant decline in adsorption performance after regeneration.The regenerated HCO exhibits a potential for long-term recycling and re-utilization,demonstrating a promising application prospect in the field of lead removal from acidic wastewater.

关 键 词：纳米水合氧化铈 酸性废水 铅 选择性吸附 

分 类 号：X703[环境科学与工程—环境工程]