膜科学与技术

膜法海水提溴用PVDF中空纤维膜的研制

作者：李晓明，吕经烈，刘国昌，张召才，关毅鹏，郭春刚

单位：国家海洋局天津海水淡化与综合利用研究所

关键词：疏水性中空纤维膜; PVDF;相转化;后处理;海水提溴;

出版年,卷(期):页码： 2011,31(5):13-17

摘要：

采用相转化法制备海水提溴用疏水性聚偏氟乙烯中空纤维膜,考察聚合物浓度、无机复合添加剂浓度、膜干燥方式及后处理方法对膜结构和性能的影响.结果表明,无机复合添加剂能有效提高膜机械性能，同时不影响膜疏水性；溶剂置换法不能完全避免膜收缩，从而直接影响膜孔结构和透气性能.物理后处理方法可显著提高膜透气性能，氮气通量为8.62m3•m-2•h-1，孔隙率为63.31%，膜断裂强度可达到1.64cN•Tex-1，膜断裂伸长率为79.10%.

Hydrophobic PVDF hollow fiber membranes for seawater bromine extraction were prepared by phase inversion method. The effects of membrane preparing conditions, such as PVDF concentration, composite inorganic additive concentration, drying methods and post-treatments on membrane structure and performance were investigated. The results showed that composite inorganic additive nearly would not affect membrane hydrophobicity, but could improve membrane mechanical property. Solvent-replacement methods could not completely prevent membrane shrinkage, which directly affecting membrane pore structure integrity and membrane permeability. Physical post-treatment was used to improve membrane permeability apparently. The Membrane N2 flux and porosity were 8.62m3•m-2•h-1 and 63.31% respectively, breaking strength was 1.64 cN•Tex-1 and breaking elongation was 79.10%.

李晓明(1980- ),女,辽宁朝阳人,硕士研究生,工程师,从事膜材料制备及应用研究.〈lixiaoming0618 @yahoo.com.cn〉

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