碳纳米管改性PVDF中空纤维超滤膜处理二级出水抗污染性能研究  

Effect of PVDF Hollow Fiber Ultrafiltration Membranes Modification with Carbonnanotube on Membrane Fouling Control During Ultrafiltration of Sewage Effluent

作　　者：王利颖[1] 石洁[1] 王凯伦[1] 关羽琪 郭瑾[1] WANG Li-ying SHI Jie WANG Kai-lun GUAN Yu-qi GUO Jin(School of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学环境与能源工程学院,北京100124

出　　处：《环境科学》2017年第1期220-228,共9页Environmental Science

基　　金：国家自然科学基金项目(51478009);北京市科技新星计划项目(xx2015B107);北京市优秀人才培养资助青年拔尖团队项目(2014000026833TD02)

摘　　要：采用碳纳米管改性PVDF中空纤维超滤膜以缓解膜污染.考察了CNTs的乙醇分散液浓度、CNTs尺寸和负载量对改性中空纤维膜的抗污染性能和改性膜内表面CNTs层稳定性的影响,分析了该改性膜对二级出水DOC、UV254的去除效果,并对改性膜出水的荧光特性进行了表征.结果表明,选用体积分数为50%的乙醇分散液、外径为30~50 nm碳纳米管、负载量为3 g·m-2时,制备的改性中空纤维膜CNTs层稳定,抗污染能力显著提高.与未改性膜相比,改性膜对二级出水DOC和UV254的去除率分别提高了37%和56%;且对二级出水中的腐殖类和蛋白质类物质去除能力明显增强.The modification of hollow fiber ultrafiltration membranes with carbon nanotube（ CNTs） on fouling control was investigated.Considering the antifouling ability of the CNT-modified membranes and the stability of CNTs layer,several factors were analyzed and evaluated,including the concentration of ethanol-dispersion,the diameter of CNTs,and the loading mass of CNTs. Besides,DOC,UV254,and fluorescence characteristics of the permeate from the CNT-modified membrane were analyzed. The results revealed that the optimal modification method included a 50%（ volume fraction） ethanol-dispersion,a 30-50 nm diameter-CNTs,and 3 g·m-2CNTs＇ loading. Compared with the virgin membrane,the removal rates of DOC and UV254 by the CNT-modified membrane were increased by37% and 56%,respectively. Meanwhile,it was proved that the humic-like and protein-like materials were more easily removed by the CNT-modified membrane.

关 键 词：超滤膜 二级出水 膜污染 碳纳米管 膜改性 

分 类 号：X703.1[环境科学与工程—环境工程]