聚砜中空纤维纳滤膜在Cr(VI)去除中的应用  

Application of polysulfone nanofiltration hollow fiber membrane in removal of chromium(VI)

作　　者：廖小深 魏俊富[1,2] 赵孔银[1,3] 王晓磊[1,2] 

机构地区：[1]天津工业大学中空纤维膜材料与膜过程教育部重点实验室,天津300387 [2]天津工业大学环境与化学工程学院,天津300387 [3]天津工业大学材料科学与工程学院,天津300387

出　　处：《天津工业大学学报》2014年第3期1-6,共6页Journal of Tiangong University

基　　金：国家高技术研究发展计划(863计划)(2013AA065601);天津市科技攻关计划项目(13ZCZDGX00500)

摘　　要：采用紫外光辐照接枝法制备了2种聚砜中空纤维纳滤膜,重点研究它们在六价铬离子Cr(VI)去除中的应用.扫描电子显微镜(SEM)分析表明丙烯酸成功接枝到膜表面上;截留性能测试表明所制备的纳滤膜对无机盐的截留率顺序为:Na2SO4>MgSO4>NaCl>MgCl2,这与一般荷负电纳滤膜的顺序是相似的.考察了pH值、进料液浓度和操作压力对Cr(VI)去除效果的影响.结果表明:纳滤膜对Cr(VI)的截留率随pH值的增大而增大,当pH=10时,NF1和NF2膜对Cr(VI)的截留率分别为92.36%和95.62%;纳滤膜对Cr(VI)的截留率随着进料液浓度的增大而迅速减小,同时渗透通量也稍有下降;纳滤膜对Cr(VI)溶液的渗透通量随着操作压力的增大几乎呈线性增大的趋势,但截留率基本维持恒定.Two kinds of polysulfone（PSF） nanofiltration hollow fiber membrane were prepared by UV photografting polymer-ization for the removal of Cr （VI）. The scanning electron microscopy analysis indicated that acrylic acid （AA） wassuccessfully grafted on membrane surface. Nanofiltration performance test revealed that the prepared NF mem-brane showed different rejection to electrolytes in a sequence of Na2SO4 MgSO4 NaCl MgCl2, which wassimilar to the sequence of negatively charged nanofiltration membranes. The factors affecting the rejection and permeate flux such as pH, feed concentration, and applied pressure were investigated. The result showed that therejection rate of Cr（VI） was increased with the increase of pH, when the pH was 10, the rejection rate to Cr （VI）of NF1 and NF2 was 92.36% and 95.62%, respectively. The rejection rate was decreased dramatically as the feedconcentration increased, in the meantime, the permeate flux was decreased slightly. The permeate flux increasedlinearly with the increase of applied pressure while the rejection rate almost remained the same.

关 键 词：聚砜 中空纤维 纳滤膜 紫外接枝 膜分离 六价铬 

分 类 号：TS102.528[轻工技术与工程—纺织工程] TS102.54[轻工技术与工程—纺织科学与工程]