水下超疏油膜的制备及其水包油乳液分离性能

Preparation of Underwater Super-oleophobic Membranes and Their Applications for Separation of Oil-in-water Emulsions

基于多巴胺在玻璃纤维膜表面自聚合形成聚多巴胺薄膜的特性,制备了玻璃纤维/聚多巴胺(FGs@PDA)复合过滤膜.利用扫描电子显微镜、X射线光电子能谱仪、热分析仪和接触角测试仪等分析了样品的形貌、结构、化学组成、热稳定性和表面浸润性.以含甲苯、1,2-二氯苯和二苯醚的水包油乳液为模拟乳液,以含亚甲基蓝、甲基紫和二甲酚橙的水溶液为模拟染料废水,考察FGs@PDA24h分离水包油乳液和吸附去除可溶性染料的性能.接触角测试结果表明:聚多巴胺修饰的玻璃纤维膜FGs@PDA24h具有水下超疏油性能,与三氯甲烷液滴的接触角接近162°.性能测试结果表明:FGs@PDA24h对含甲苯、1,2-二氯苯和二苯醚等模拟乳液的分离效率超过98%;对含亚甲基蓝、甲基紫和二甲酚橙等模拟染料的吸附去除效率超过90%.

We report a simple approach to fabricating functional Fiberglass@polydopamine (FGs@PDA x h ) membranesby virtue of dopamine self-polymerization under mild conditions.The morphology,structure,composition,thermal stability and water contact angle of the as-prepared membranes were analyzed by scanning electron microscopy,X-ray photoelectron spectroscopy,thermo-gravimetric analysis and contact angle system,respectively.Toluene-in-water,1,2-dichlorobenzene-in-water and diphenyl oxide-in-water are used as simulated emulsions,meanwhile,methylene blue,methyl violet and xylenol orange in aqueous solution are used as simulated pollutants,then the separation of oil-in-water emulsion and adsorption of soluble dyes by FGs@PDA 24h membranes were studied.The contact angle analyzed results show that the as-prepared FGs@PDA 24h membrane has the property of underwater super-oleophobicity with trichloromethane contact angle of 162° after being modified by polydopamine.Performance test results show that the FGs@PDA 24h membranes exhibit excellent separation efficiencyabove 98% for simulated oil-in-water emulsionsincluding toluene-in-water,1,2-dichlorobenzene-in-water and diphenyl oxide-in-water,and high adsorption separation efficiency above 90% for simulated water-soluble dyes including methylene blue,methyl violet and xylenol orange in aqueous solution.