A novel γ-Al2O3 nanofiltration membrane via introducing hollow microspheres into interlayers for improving water permeability

被引:28
作者
Fu, Weigui [1 ,2 ]
Zhang, Xu [1 ,2 ]
Mao, Yunyun [1 ,2 ]
Pei, Tengfei [1 ,2 ]
Sun, Baoshan [2 ]
Mei, Shuzhen [2 ]
Chen, Li [1 ,2 ,3 ]
机构
[1] Tianjin Polytech Univ, Sch Mat Sci & Engn, Tianjin 300387, Peoples R China
[2] Tianjin Polytech Univ, State Key Lab Separat Membranes & Membrane Proc, Tianjin 300387, Peoples R China
[3] Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China
关键词
gamma-Al2O3; Ceramic membrane; Nanofiltration; Dip-coating; Interlayer; ATOMIC LAYER DEPOSITION; CERAMIC MEMBRANES; TIO2; MEMBRANES; MICROPOROUS TIO2; PERFORMANCE; SEPARATION; RETENTION; TRANSPORT; ZRO2; PERVAPORATION;
D O I
10.1016/j.ceramint.2018.05.261
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Ceramic nanofiltration (NF) membranes with high resistance to harsh environments have been widely studied and applied in various fields, involving food, bioengineering and water purification. In this work, gamma-Al2O3 hollow microspheres with mesoporous shell structures served as an interlayer on a high-flux alpha-Al2O3 hollow fiber microfiltration (MF) membrane to increase porosity and permeability. Here, the boehmite sol was made from the pseudo-boehmite precursor with a mild and environment friendly feature, instead of the conventional methods using aluminum alkoxides. The self-assembled microspheres (SAMs) mixture and boehmite sol were applied to make an interlayer and toplayer successively on alpha-Al2O3 substrates by dip-coating. Where, the SAMs constructed by poly-(styrene-acrylic acid) (PSA) microspheres and boehmite colloidal particles could stop the boehmite sol from permeating into inner pores of the support. Next, the composite membranes were calcined to remove organic components and finish the decomposition of the Al hydroxides at 600 degrees C for 2 h. The results show that the gamma-Al2O3 composite NF membrane has a high pure water permeability of 26.4 L M-2 h(-1) bar(-1), with high retention rate for multivalent cations and low retention rate for monovalent cations, respectively, and the molecular weight cut-off (MWCO) of approximately 1500 Da.
引用
收藏
页码:15824 / 15832
页数:9
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