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采用非溶剂致相分离法制备TiO_2/PVDF改性中空纤维超滤膜,利用傅里叶红外吸收光谱技术、扫描电镜表征了膜的化学组成及微观形态,考察了添加纳米TiO_2粒子对PVDF膜的纯水通量、截留率、机械强度、孔隙率及亲水性等性能的影响。结果表明,与未添加纳米TiO_2粒子的膜相比,其微观结构、亲水性及膜性能均有显著提高;纳米TiO_2粒子的添加有效改善了膜的亲水性及机械强度,但过量添加会造成团聚,从而影响膜的分离性能。纳米TiO_2粒子的质量分数为1%时制得的膜综合性能为优,纯水通量达到了524.3 L/(m2·h),BSA截留率达到了96.3%,拉伸强度为2.69 MPa,断裂伸长率为182%,表面纯水接触角为65.4°,孔隙率为77.9%。
TiO 2 / PVDF modified hollow fiber ultrafiltration membrane was prepared by non-solvent induced phase separation method. The chemical composition and microstructure of the membrane were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The effects of adding TiO 2 / PVDF on PVDF membrane Pure water flux, retention rate, mechanical strength, porosity and hydrophilic properties. The results showed that the microstructure, hydrophilicity and membrane properties were significantly improved compared with those without nano-TiO 2 particles. The addition of nano-TiO 2 effectively improved the hydrophilicity and mechanical strength of the membrane, but excessive addition of Resulting in reunion, thus affecting the membrane separation performance. When the mass fraction of nano-TiO 2 particles is 1%, the comprehensive performance of the membrane is excellent, the pure water flux reaches 524.3 L / (m 2 · h), the BSA rejection rate reaches 96.3%, the tensile strength is 2.69 MPa, the fracture The elongation was 182%, the surface water contact angle was 65.4 °, and the porosity was 77.9%.