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羟基化MXene二维层状膜对重金属离子的脱除

作者：王赛娣，范议议，孟秀霞，靳昀，张津津，杨乃涛

单位：山东理工大学化学化工学院，山东淄博 255049

关键词：膜分离；MXene层状膜；羟基化；重金属；脱除

DOI号：

分类号： TQ028.2+1

出版年,卷(期):页码： 2022,42(1):57-64

摘要：

近年来，现代工业迅速发展的同时，也导致了废水排放量增加，其中水体重金属污染已经成为目前亟待解决的问题之一。基于膜分离高效、环保和无污染的优势，被广泛用于重金属废水处理，本文利用LiF和HCl混合溶液刻蚀MAX相(Ti3AlC2)，制备了稳定的Ti3C2（MXene）胶体溶液；通过真空辅助抽滤，组装成层间通道可控的、稳定性较好的MXene膜；利用KOH溶液碱化处理，得到表面改性的碱化MXene (Ak-MXene) 膜。以压力为驱动力，考察了膜对水体中Cr6+、Pb2+、Cu2+和Cd2+离子的脱除率。结果表明，随着膜厚的逐渐增加，Ak-MXene膜对重金属离子的拦截率逐渐增大；0.02 MPa下，厚度为496 nm的Ak-MXene膜对Cr6+、Pb2+、Cu2+和Cd2+的最高拦截率分别为66.19%，76.57%，78.65%和79.21%。可见Ak-MXene膜对重金属具有较高的拦截率，有望应用于水体净化。

In recent years, the rapid development of modern industry has led to the increase of wastewater discharge, among which heavy metal pollution has become one of the problems to be solved. Based on the advantages of high efficiency, environmental protection and pollution-free, membrane separation is widely used in the treatment of heavy metal wastewater. In this paper, stable Ti3C2 (MXene) colloidal solution was prepared by etching the MAX phase (Ti3AlC2) with LIF and HCl mixed solution. The MXene membrane with controllable interlayer channels and good stability was assembled by vacuum assisted filtration and heat treatment. The surface modified alkaline MXene (Ak-MXene) membrane was prepared by alkaline treatment with KOH solution.The removal of Cr6+, Pb2+, Cu2+ and Cd2+ ions in water by membrane were investigated with pressure as driving force. The results showed that with the increase of membrane thickness, the rejection rate of heavy metal ions by Ak-MXene membrane increased gradually. At 0.02 MPa, the Ak-MXene membrane with a thickness of 496 nm has the highest rejection rates of Cr6+, Pb2+, Cu2+ and Cd2+ were 66.19%, 76.57% ,78.65%and 79.21%, respectively. It can be seen that Ak-MXene membrane has a high removal performance for heavy metals and is expected to be used in water purification.

基金项目：

国家自然科学基金(21978157, 21776165, 21878179)和山东省自然科学基金(ZR2019MB056).

作者简介：

王赛娣（1995），女，山东省滨州市人，学历：研究生，学位：硕士学位，研究方向：材料化学工程

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