LOW-COST PREPARATION OF SUPER-HYDROPHILIC ALKALI-ACTIVATED SLAG/COPPER MESH COMPOSITE MEMBRANE AND ITS OIL-WATER SEPARATION PERFORMANCE

Abstract

Abstract: Super-hydrophilic membranes have been widely concerned in oil-water separation, but they are still limited by high cost, complex preparation process and weak stability. In this study, a super-hydrophilic alkali-excited slag/copper mesh composite membrane was prepared by a simple "coating-curing" process using low cost, green slag solid waste as raw material, and the effects of the preparation process conditions on the membrane performance were investigated. The results showed that the water flux of the optimal membrane under gravity conditions was 126.97 L/(m²·h), and the separation efficiency of cetane and other emulsions was more than 99% , and the efficiency of cetane emulsion was maintained above 99.30% after 10 consecutive treatments. The super hydrophilicity and hydrophobicity make the membranes have good self-cleaning, and can maintain high stability and separation efficiency even under harsh conditions.

Key words: slag, superhydrophilic, copper mesh, oil-water separation

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