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Removal of heavy metal ions by hydroxylated MXene membrane

Authors： Saidi Wang, Yiyi Fan, XiuXia Meng, Yun Jin, Jinjin Zhang, Naitao Yang

Units： School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China

KeyWords： membrane separation; laminar MXene membrane; hydroxylation; heavy metals; rejection rates

ClassificationCode：TQ028.2+1

year,volume(issue):pagination： 2022,42(1):57-64

Abstract：

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.

Funds：

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

AuthorIntro：

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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