PEG/GO/TiO_(2)纳米复合材料改性PVDF膜的制备及其抗污性能

Preparation and antifouling performance of PVDF membranes modified with PEG/GO/TiO_(2) nanocomposites

为改善聚偏氟乙烯(PVDF)膜的抗污性能,以聚乙二醇2000接枝的GO/TiO_(2)(PEG/GO/TiO_(2))纳米复合材料为添加剂,通过非溶剂诱导沉淀相分离法制备了一系列PEG/GO/TiO_(2)/PVDF复合超滤膜。采用FTIR、SEM和接触角测试仪对其结构和形貌进行了表征,采用超滤法评价其纯水通量和抗污性能。结果表明,当PEG/GO/TiO_(2)纳米复合材料质量分数为0.60%时,制备的PEG/GO/TiO_(2)/PVDF复合超滤膜(记为0.60%PEG/GO/TiO_(2)/PVDF)表现出最佳的亲水性和抗污性能,其接触角比PVDF膜下降8.2°,总孔隙率增加13.40%,PEG/GO/TiO_(2)纳米复合材料在PVDF膜中分散较均匀。在0.08 MPa的工作压力下,0.60%PEG/GO/TiO_(2)/PVDF的纯水通量高达282.44 L/(m^(2)·h),对腐植酸溶液的过滤通量为131.96 L/(m^(2)·h),水力清洗后的纯水通量为194.98 L/(m^(2)·h),分别为PVDF膜[133.80 L/(m^(2)·h)、90.50 L/(m^(2)·h)、109.57 L/(m^(2)·h)]的2.1倍、1.5倍和1.8倍。因此,PEG/GO/TiO_(2)纳米复合材料作为一种有效添加剂显著提高了PVDF膜的抗污性能。

In order to improve the antifouling performance of polyvinylidene fluoride(PVDF)membrane,a series of polyethylene glycol(PEG)/GO/TiO_(2)/PVDF composite ultrafiltration membranes were prepared by non-solvent induced phase separation method with PEG 2000 grafted GO/TiO_(2) nanocomposites as additives.The PEG/GO/TiO_(2)/PVDF composite ultrafiltration membranes obtained were then characterized by FTIR,SEM and contact angle tester for structure and morphology analyses,and evaluated for pure water flux and antifouling performance in ultrafiltration.The results showed that,when the mass fraction of PEG/GO/TiO_(2) nanocomposites was 0.60%,the PEG/GO/TiO_(2)/PVDF composite ultrafiltration membrane prepared(denoted as 0.60%PEG/GO/TiO_(2)/PVDF)exhibited the best hydrophilicity and antifouling performance.Compared with PVDF membrane,the 0.60%PEG/GO/TiO_(2)/PVDF,with PEG/GO/TiO_(2) nanocomposites evenly distributed in PVDF membrane,displayed a decrease in static contact angle by 8.2°,and increase in total porosity by 13.40%.Under working pressure of 0.08 MPa,the pure water flux of 0.60%PEG/GO/TiO_(2)/PVDF membrane reached up to 282.44 L/(m^(2)·h),the filtration flux of humic acid solution was 131.96 L/(m^(2)·h),and the pure water flux after hydraulic cleaning remained 194.98 L/(m^(2)·h),which were 2.1-fold,1.5-fold and 1.8-fold those of PVDF membrane[133.80 L/(m^(2)·h)、90.50 L/(m^(2)·h)、109.57 L/(m^(2)·h)],respectively.Therefore,the addition of PEG/GO/TiO_(2) nanocomposites as effective additive improved the antifouling performance of PVDF membrane.