Hydrophilicity reversal by post-modification: Hydrophobic zeolite FAU and LTA coatings on stainless-steel-net for oil/water separation

被引:21
作者
Chen, Fangge [1 ]
Li, Yanhong [1 ]
Huang, Aisheng [1 ]
机构
[1] East China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Dongchuan Rd 500, Shanghai 200241, Peoples R China
基金
中国国家自然科学基金;
关键词
Oil/water separation; Hydrophobic zeolite coating; Zeolite FAU and LTA coatings; Post-synthetic modification; SEEDING-FREE SYNTHESIS; WATER MIXTURES; COATED MESH; MEMBRANES; OIL; PERVAPORATION; 3-AMINOPROPYLTRIETHOXYSILANE; DEHYDRATION;
D O I
10.1016/j.colsurfa.2020.124936
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Because of the increase of industrial wastewater containing insoluble oil and oil discharged accidents, oil/water separation has turned out an exceedingly crucial and urgent issue in environmental protection. Therefore, it is terribly significant to develop a simple and effective technology for oil/water separation. Membrane separation has been well known as a promising method to remove oils from water due to its energy-efficiency and cost-effectiveness. In the present work, we report the synthesis of a hydrophobic zeolite FAU named F-FAU through a simple and effective post-synthetic modification. Firstly, a thin zeolite FAU layer is grown on the 3-aminopro-pyltriethoxysilane (APTES) modified stainless steel net (SSN) to form SSN supported FAU (SSN@FAU) coating. And then, a hydrophobic SSN@F-FAU coating is prepared through post modification of SSN@FAU coating with perfluorooctyltriethoxysilane (POTS). After POTS modification, the water contact angle (CA) of the SSN@FAU coating increases from 15 degrees to 132 degrees for SSN@F-FAU coating, while both morphology and structure of the SSN@ FAU coating keep unchangeable. Attributing to the high hydrophobicity of the F-FAU coating, the SSN@F-FAU coating shows a wonderful oil/water separation performance, with oil/water separation efficiency of above 98.8 0/0 and oil flux of up 50,000 L M(-2)h(-)(1). After 50 cycles successive separation of hexane/water mixture, the separation efficiency of the SSN@F-FAU coating keeps constant (over 99.1 %), showing potential application for oil/water separation in industries. Further, hydrophobic SSN@F-LTA coating can be consistently prepared through post modification of SSN@LTA coating with POTS, and also shows a high oil/water separation performance, with oil/water separation efficiency above 99.0 % and oil flux over 40,000 L M-2 h(-2), confirming the universality of the preparation strategy.
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页数:8
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