水稳定PEI@UIO-67-bpy复合材料的制备及对Cr(VI)的吸附

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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.

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	胡雨露
	王驰
	王涛
	曾巧
	李凯

关键词 ：聚乙烯亚胺, 金属有机框架, 水稳定性能, 铬, 循环

Abstract：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.

Key words： polyethyleneimine metal-organic framework water stability chromium cycling performance

收稿日期: 2024-05-18

PACS:

X703

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

通讯作者: 王驰,教授,wangchikg@163.com E-mail: wangchikg@163.com

作者简介: 胡雨露(1998-),男,湖北荆州人,昆明理工大学硕士研究生,主要从事水污染治理方向的研究.1344712817@qq.com.

引用本文:

胡雨露, 王驰, 王涛, 曾巧, 李凯. 水稳定PEI@UIO-67-bpy复合材料的制备及对Cr(VI)的吸附[J]. 中国环境科学, 2024, 44(12): 6741-6752. HU Yu-lu, WANG Chi, WANG Tao, ZENG Qiao, LI Kai. Preparation of water-stabilized PEI@UIO-67-bpy composites and adsorption of Cr(VI). CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(12): 6741-6752.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I12/6741

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