PVDF中空纤维抗污染膜的制备与表征

Preparation and characterization of Fe(Ⅲ)-Cu(Ⅱ)/PVDF hollow fiber membrane

采用干-湿相转化法制备Fe(Ⅲ)-Cu(Ⅱ)/PVDF中空纤维抗污染膜,讨论了不同添加剂量的变化及不同的工艺参数对膜性能的影响.通过扫描电子显微镜、水通量测定仪、机械强度测定仪、接触角测定仪分别对膜的微观结构、水通量、抗污染性、机械强度、接触角进行联合表征,分析不同因素对膜性能的影响趋势.结果表明:随着PVDF粉加入量、无机掺杂物质的量、添加剂的量的增加,膜的纯水通量均呈降低趋势,但截留率、拉伸强度、亲水性、及抗污染性能均随变化而增大;随着膜制备的工艺参数——纺丝速度、凝固浴温度的增加,膜的纯水通量增大,而截留率呈下降趋势,膜的拉伸性能得到提高;随着膜制备的工艺参数——干程距离的增大,膜的纯水通量和截留率分别呈现出增大和减小的趋势,膜的孔隙率和拉伸强度及断裂伸长率先增大后减小.

Fe（III ）-Cu（ II ）/PVDF hollow fiber membrane and discussed the effects of different additives and process was made by the method of dry-wet spinning, parameters on the membrane performance. The microscopic structure of the membrane, water flux, fouling resistance, mechanical strength and the contact angle was characterized by scanning electron microscopy, the water flux meter, mechanical strength tester, and contact angle analyzer respectively. The results showed that with the increasing of the dosage of PVDF powder, the amount of inorganic doping substances and additives, the water flux of the membrane showed a tendency to decrease, but the retention rate, tensile strength, hydrophilic, and anti- pollution properties increased; with the increasing of membrane preparation process parameters such as the spinning speed and coagulation bath temperature, the membrane pure water flux was increased while the retention rate was declined, and tensile properties of the membrane was improved; with the increasing of the dry distance, the membrane pure water flux increased, and the retention rate decreased, the membrane porosity , tensile strength and elongation firstly increased and then decreased.