Fabrication and stability of GO/Al2O3 composite nanofiltration membranes

被引：0

作者：

Wang J. ^{[1
]}

Niu S. ^{[2
]}

Fei Y. ^{[1
]}

Qi H. ^{[1
]}

机构：

[1] Membrane Science and Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, Jiangsu

[2] Hongyi Ceramic Membranes Research Institute, Nanjing Hongyi Ceramic Nanofiltration Membranes Co., Ltd., Nanjing, 210009, Jiangsu

来源：

Huagong Xuebao/CIESC Journal | 2020年 / 71卷 / 06期

关键词：

Dopamine; Graphene oxide; Loading amount; Nanofiltration; Stability; Tubular Al[!sub]2[!/sub]O[!sub]3[!/sub] membranes;

D O I：

10.11949/0438-1157.20200205

中图分类号：

学科分类号：

摘要：

Using an tubular Al2O3 ultrafiltration membrane with an average pore diameter of 20 nm as the carrier, after modified by dopamine, a pressure-driven deposition method was used to successfully prepare a GO/Al2O3 composite nanofiltration membrane that can be stable in aqueous solution for a long time. The thickness of GO layer can be controlled by changing the loading amount. The results showed that the pure water permeability of all GO/Al2O3 composite nanofiltration membranes decreased and then reached a steady state during the cross-flow filtration. In addition, the pure water permeability of GO/Al2O3 composite nanofiltration membranes decreased as the GO loading amount increased. The permeability and rejection of GO/Al2O3 composite nanofiltration membranes remained stable when GO loading amount was greater than 90 mg/m2. As the storage time (in pure water) extended, the cross-linking of GO sheets caused by residual salt ions during tests led to a higher rejection of GO/Al2O3 composite nanofiltration membranes towards monovalent and divalent salts. After being immersed in pure water for 680 h, the GO/Al2O3 composite nanofiltration membrane with GO loading amount of 140 mg/m2 showed the highest Na2SO4 rejection of 91.0%. The rejections of GO/Al2O3 composite nanofiltration membranes towards four salt solutions were as follows: R(Na2SO4) > R(MgSO4) > R(NaCl) > R(MgCl2). © All Right Reserved.

引用

页码：2795 / 2803

页数：8

共 38 条

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