多壁碳纳米管改性正渗透膜及抗污染性能分析  

Forward Osmosis Membranes Modified by Multi-walled Carbon Nanotubes and Analysis of its Antifouling Property

作　　者：田浦 王磊[1] 张慧慧 王旭东[1] 马藤 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《水处理技术》2017年第12期66-69,73,共5页Technology of Water Treatment

基　　金：国家自然基金项目(51278408)

摘　　要：将多壁碳纳米管(MWCNTs)和醋酸纤维素(CA)进行物理共混改性,利用相转化法制备MWCNTs改性正渗透膜,通过扫描电子显微镜和傅立叶红外分光光度计的表征、水通量和反向盐通量的测定等方法考察了MWCNTs添加量对膜结构及性能的影响,并采用耗散型石英晶体微天平探讨了高盐条件下海藻酸钠(SA)在不同含量MWCNTs改性膜表面的吸附行为及吸附层结构特征。结果表明,添加适量MWCNTs能使膜的渗透性能和抗污染性能明显提高。当MWCNTs的质量分数为0.5%时,膜性能最佳,其纯水通量为14.5 L/(m^2·h),反向盐通量为8.54 g/(m^2·h)。在一定范围内,随着MWCNTs的含量增加,膜表面对SA的吸附速率和吸附量降低,形成的吸附层更为疏松。Multi-wall carbon nanotubes （MWCNTs） and cellulose acetate （CA） were modified by physical blending, and forward osmosis membrane was fabricated by phase inversion method. The effect of MWCNTs dosage on membrane structure and property was researched by scanning electron microscope （SEM）, fourier transform infrared spectrophotometer （FI-TR）, water flux and reverse salt flux measurement. Adsorption of sodium alginate （SA） on different membrane surface under the condition of high salinity was measured by quartz crystal microbalance with dissipation monitoring （QCM-D）. The results showed that adding proper amount of MWCNTs could enhance the permeability and antifouling property of membrane significantly. When the mass fraction of MWCNTs was 0.5%, performance of forward osmosis membrane was the best, and its pure water flux was 14.5 L/（m^2·h）, reverse salt flux was 8.5 g/（m^2·h）. Within a certain range, with the increase of MWCNTs content, adsorption amount and adsorption rate of SA on surface of membrane could decrease, and the adsorption layer became more loose.

关 键 词：正渗透膜 多壁碳纳米管 改性 海藻酸钠 抗污染性 高盐 

分 类 号：TQ028.8[化学工程]