纳米SiO_2的加入对PVDF/SiO_2超滤膜结构和性能的影响  

Effects of the addition of nano-sized SiO_2 on the structure and performance of PVDF/ SiO_2 ultrafiltration membrane

作　　者：张晶[1] 李雪茹[1] 樊文玲[2] 李磊[1] 

机构地区：[1]南京大学化学化工学院化工系,南京210093 [2]南京中医药大学药学院,南京210029

出　　处：《膜科学与技术》2012年第1期51-54,共4页Membrane Science and Technology

基　　金：国家自然科学基金青年基金项目(30801552);江苏省中医药局科技项目(L209006)

摘　　要：将普通纳米SiO2、疏水纳米SiO2、亲水纳米SiO2分别加入到聚偏氟乙烯(PVDF)铸膜液中,通过相转化法制得PVDF/SiO2杂化超滤膜,重点探讨了SiO2加入量及上述三种类型纳米SiO2对PVDF杂化超滤膜水通量、截留率和抗污染性能的影响.结果表明:膜的孔隙率、平均孔径、水通量、截留率和抗污染性随SiO2含量增加而先增大后减少;SiO2含量为2%时,膜水通量由大至小为:普通纳米SiO2杂化膜、疏水纳米SiO2杂化膜、亲水纳米SiO2杂化膜,抗污染性由大至小为:亲水纳米SiO2杂化膜、普通纳米SiO2杂化膜、疏水纳米SiO2杂化膜.The unmodified, hydrophilic and hydrophobic nano-sized SiO2 were added into the PVDF casting solution respectively, and the PVDF/SiO2 hybrid membranes were prepared by phase inversion method. The effects of SiO2 concentration and the above-mentioned three types of SiO2 on the PVDF membrane performances such as pure water flux, rejection ratio, anti-fouling capability were examined. The experimental results indicated that membrane porosity, mean membrane pore size, pure water flux, rejection ration, anti-fouling capability increased with rising SiOz concentration firstly and then decreased. Besides, when the SiO2 concentration was 2~, in terms of pure water flux, unmodified nano-sized SiO2 hybrid membrane was the best, followed by hydrophobic nano-sized SiOz hybrid membrane and hydrophilic nano-sized SiO2 hybrid membrane. Inversely, in terms of anti-fouling capability, hydrophilic nano-sized SiO2 hybrid membrane was the optimal, followed by unmodified nano-sized SiO2 hybrid membrane and hydrophobic nano-sized SiO2 hybrid membrane.

关 键 词：聚偏氟乙烯 纳米二氧化硅 杂化膜 

分 类 号：TB383.2[一般工业技术—材料科学与工程]