聚乙烯醇修饰准对称无机膜的正向渗透效能  

Polyvinyl alcohol modified quasi-symmetric thin film inorganic membrane for enhanced forward osmosis performance

作　　者：钟溢健[1] 张金娜[1] 王秀蘅[1] 任南琪[1] 

机构地区：[1]哈尔滨工业大学城市水资源与环境国家重点实验室,市政环境工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2015年第8期7-11,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51378143;51208142);城市水资源与水环境国家重点实验室(哈尔滨工业大学)自主课题(2014DX06);黑龙江省自然科学基金面上项目(E201154)

摘　　要：为进一步提高准对称结构无机薄膜(QSTFI膜)的正向渗透(forward osmosis,FO)效能,利用聚乙烯醇(PVA)对其进行亲水性修饰,研究了不同PVA质量分数对膜的水通量及比盐通量的影响.膜表征结果表明:经过PVA修饰的膜表面负电荷增多,有利于膜对Na+的截留;此外修饰膜表面的亲水性提高有利于获得更高的水通量.通过FO实验确定PVA最佳质量分数为0.5%.当提取液(DS)为2.0 mol·L-1Na Cl、原液(FS)为去离子水时,修饰膜水通量为67.08 L·m-2·h-1,比同条件下QSTFI膜水通量高12%;而比盐通量为0.15 g·L-1,比QSTFI膜低16.7%.membrane To further promote the FO performance of QSTFI membrane, polyvinyl alcohol （PVA） modified QSTFI （PVA-QSTFI） has been developed. The characterization results indicated that the incorporation of a small amount of PVA onto the QSTFI membrane has significant influence on the surface hydrophilicity, pore structure, surface charge and thus FO performance. An optimum PVA loading rate of 0.5% was chosen based on the water flux and specific salt flux experiments. Using the 2.0 mol· L-1 NaC1 as DS, deionized water as FS, the modified membrane offered a 67.08 L·m-2·h-1 water flux at 25 ℃, was 12% higher than that of QSTFI membrane. Meanwhile, a specific salt flux of 0.15 g·L-1 was obtained, which is 16.7% lower than QSTFI membrane.

关 键 词：正向渗透膜 聚乙烯醇修饰 亲水性 水通量 盐通量 

分 类 号：TQ028.3[化学工程]