Two-dimensional Cu-porphyrin nanosheet membranes for nanofiltration  

作　　者：Jiahao Cai Shizheng Song Lijie Zhu Qipeng Lu Zong Lu Yanying Wei Haihui Wang 

机构地区：[1]School of Chemistry&Chemical Engineering,Guangdong Provincial Key Lab of Green Chemical Product Technology,State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China [2]School of Instrument Science and Opto-Electronics Engineering,Beijing Information Science and Technology University,Beijing 100192,China [3]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [4]Beijing Key Laboratory for Membrane Materials and Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Nano Research》2023年第5期6290-6297,共8页纳米研究（英文版）

基　　金：the support from the National Key Research and Development Program(No.2021YFB3802500);the National Natural Science Foundation of China(Nos.22022805 and 22078107);This work was supported by State Key Laboratory of Pulp and Paper Engineering(No.2022PY04);Fundamental Research Funds for the Central Universities(No.2022ZYGXZR010).

摘　　要：A kind of two-dimensional(2D)metal-organic framework(MOF)material,Cu-meso-tetrakis(4-carboxyphenyl)porphine(Cu-TCPP)nanosheets with wrinkled and flat morphologies are used as building blocks to assemble membranes by vacuum filtration(VF)and electrophoretic deposition(EPD)as energy-efficient nanofiltration(NF)membranes to remove dyes from water.Since the nanosheets with wrinkled structure can provide additional water transport channels,thereby increasing the water permeance,in the premise of a high rejection(>97.0%)for the dye brilliant blue G(BBG)(1.60 nm×1.90 nm),the water permeance of the membrane assembled by the wrinkled nanosheets(~1170 nm)is about 4 times that of the membrane assembled by the flat nanosheets(~530 nm),reaching 16.39 L·m^(−2)·h^(−1)·bar^(−1).Additionally,the use of the relatively flat nanosheets and the membrane preparation method of electrophoretic deposition is more conducive to stack nanosheets orderly and reduce defects.Therefore,the water permeance of the membrane prepared by EPD(~1170 nm)with flat nanosheets is about twice that of the membrane prepared by VF(~530 nm),achieving 9.40 L·m^(−2)·h^(−1)·bar^(−1)with similar rejection(>97.0%)of dye evans blue(EB)(3.10 nm×1.20 nm).Furthermore,these membranes still exhibit good separation performance at high pressure of 0.6 MPa.Nanosheets with diverse structures and various membrane fabrication processes provide new directions for the separation performance optimization of 2D MOF materials for water purification.

关 键 词：two-dimensional material membrane metal-organic framework(MOF) NANOFILTRATION nanosheet morphology electrophoretic deposition 

分 类 号：TB383[一般工业技术—材料科学与工程]