针对水包油乳液难以分离的问题,采用简单便捷的共沉积法对乙酸纤维素(CA)膜进行改性,将没食子酸(GA)、聚乙烯亚胺(PEI)和铜离子共沉积在CA膜表面,制备了新型超亲水/水下超疏油CuSO4@GA@PEI@CA复合膜。通过扫描电子显微镜、能量色散谱仪、傅里叶变换红外光谱仪、X射线光电子能谱仪对复合膜的形貌结构和化学组成进行了表征。结果表明:通过增加表面粗糙度和表面能,CuSO4@GA@PEI@CA复合膜表现出良好的亲水性和水下超疏油性能,其水接触角和水下油接触角分别为26.7°和162.1°;复合膜可以分离6种水包油乳液,渗透通量保持在478.18～577.73L/(m2·h);复合膜具有良好的循环使用性能,分离10次后其渗透通量仍能保持91%以上。
To address the challenge of oil-in-water emulsion separation,the cellulose acetate (CA) membrane was modified using a straightforward and practical co-deposition technique,where gallic acid (GA),polyethyleneimine (PEI),and copper ions were co-deposited on the surface of the CA membrane to prepare a novel superhydrophilic/underwater superoleophobic CuSO4@GA@PEI@CA composite membrane.The morphology and chemical composition of the composite membrane were characterized by SEM,EDS,FT-IR,and XPS.The results showed that by increasing the surface roughness and surface energy,the CuSO4@GA@PEI@CA composite membrane exhibited excellent hydrophilicity and underwater superoleophobic properties,and its water contact angle and underwater oil contact angle were 26.7° and 162.1°,respectively.In addition,six oil-in-water emulsions were successfully separated by the composite membrane,and the flux remained between 478.18 and 577.73L/(m2·h).The composite membrane also had good recycling performance,and its permeation flux remained above 91% after 10 separation cycles.
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基金资助
国家自然科学基金(21777143)
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