聚醚砜基膜热稳定性对复合纳滤膜性能的影响

Effect of thermal stability of polyethersulfone supporting ultrafiltraion membrane on properties of composite nanofiltration membrane

研究聚醚砜超滤基膜的热稳定性对界面聚合法制备复合纳滤膜性能的影响.加入TiO2纳米粒子可显著改善超滤膜的热稳定性,并随着基膜中TiO2的增加,超滤基膜的热稳定性也随之增加.基膜TiO2含量增至8%时,纳滤膜的水通量从27 L/(m^2·h)逐渐增加到38 L/(m^2·h),对NaCl的截留率从48%增加到58%,而对MgSO4的截留率保持不变.研究表明,提高微滤基膜的热稳定性有助于提高复合纳滤膜的水通量和截留率.

This study investigated the effects of the thermal stability of the supporting ultrafiltraion membrane on the performance of the final thin-film-composite nanofiltration membrane fabricated via interfacial polyemerisation process.In this study,the thermal stability of the ultrafiltration support membrane was greatly improved by incorporating TiO2 nanoparticles.With the increasing of the TiO2 loading in the support membrane,the thermal stability of the ultrafiltration support membrane increases.The water flux of the NF membrane increases gradually from 27 L/(m^2·h)for the membrane without TiO2 loading to 38 L/(m^2·h)for the membrane with 8%TiO2 loading.The rejection of the NaCl increases from 48%for the membrane without TiO2 loading to 58%for the membrane with 8%TiO2 loading and the rejection of MgSO4 remains the same.These results indicate that the improvement of thermal stability of the support membrane helps enhance both the water flux and salt rejection of the final NF membrane.