水稳定PEI@UIO-67-bpy复合材料的制备及对Cr(Ⅵ)的吸附  

Preparation of water-stabilized PEI@UIO-67-bpy composites and adsorption of Cr(Ⅵ)

作　　者：胡雨露 王驰[1] 王涛 曾巧 李凯[2] HU Yu-lu;WANG Chi;WANG Tao;ZENG Qiao;LI Kai(Yunnan Province Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials,The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province,Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Faculty of Environmental Science Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学化学工程学院,云南省磷化工节能与新材料重点实验室,云南省高校磷化工重点实验室,云南昆明650500 [2]昆明理工大学环境科学与工程学院,云南昆明650500

出　　处：《中国环境科学》2024年第12期6741-6752,共12页China Environmental Science

基　　金：地区科学基金资助项目(52260013);云南省重大科技项目(202202AG050005)。

摘　　要：使用溶剂热法制备了水稳定性较好的UIO-67-bpy,再通过简单的浸渍法将含有大量氨基官能团的聚乙烯亚胺(PEI)引入UIO-67-bpy,进一步加强稳定性并提升对Cr(Ⅵ)的吸附性能及循环再生能力.动力学实验表明吸附在90min时达到吸附平衡且去除率高达99%,PEI@UIO-67-bpy对Cr(Ⅵ)的吸附符合拟二级动力学模型.Langmuir等温线模型得出的理论最大吸附量为297.7mg/g.循环再生实验表明,Cr(Ⅵ)的去除效率在5次循环后保持在95%以上.PEI@UIO-67-bpy对Cr(Ⅵ)的去除涉及静电作用及Cr(Ⅵ)的还原.总而言之,PEI@UIO-67-bpy是一种制备简单,稳定性及吸附性能良好,且能循环使用的优秀吸附剂.UIO-67-bpy with good water stability was prepared by a solvothermal method,and polyethyleneimine(PEI),which contains a large number of amino functional groups,was introduced into UIO-67-bpy by a simple impregnation method to further enhance the stability and improve the adsorption performance and recycling ability for Cr(Ⅵ).The kinetics experiments showed that the adsorption reached the adsorption equilibrium at 90min and the removal rate was as high as 99%,and the adsorption of Cr(Ⅵ)by PEI@UIO-67-bpy was in accordance with the proposed two-stage kinetic model.The theoretical maximal adsorption capacity of Cr(Ⅵ)derived from the Langmuir isotherm model was 297.7mg/g.The cyclic regeneration experiments demonstrated that the removal efficiency of Cr(Ⅵ)was maintained at more than 95%after five cycles.The removal of Cr(Ⅵ)by PEI@UIO-67-bpy involves electrostatic interaction and reduction of Cr(Ⅵ).In conclusion,PEI@UIO-67-bpy is an excellent adsorbent with simple preparation,good stability and adsorption properties,and can be recycled.

关 键 词：聚乙烯亚胺 金属有机框架 水稳定性能 铬 循环 

分 类 号：X703[环境科学与工程—环境工程]