采用浸没沉淀相转化法改变铸膜液温度、凝固浴温度制备聚砜(PSF)超滤膜,考察温度对PSF超滤膜微观结构、孔隙率、纯水通量、水接触角、截留率和抗污染性能的影响。结果表明:铸膜液温度升高,黏度大幅度降低,提升溶剂与凝固浴的扩散速率使沉淀速率加快,从而造成表面皮层结构逐渐变薄、小孔结构变多。PSF超滤膜的纯水通量、孔隙率、水接触角、截留率及抗污染性能先升高后降低。当凝固浴温度升高,聚砜超滤膜断面指状孔孔径变小,膜表面皮层变得越来越致密。PSF超滤膜的纯水通量、孔隙率降低,总污染比逐渐升高,亲水性变差。当铸膜液温度为70℃、凝固浴温度为30℃时制备的PSF超滤膜综合性能最佳。
Polysulfone (PSF) ultrafiltration membrane was prepared by immersion precipitation phase inversion method by changing the casting solution temperature and solidification bath temperature.The effects of temperature on the microstructure,porosity,pure water flux,water contact angle,retention rate and anti-pollution performance of PSF ultrafiltration membrane were investigated.The results showed that the viscosity of the casting solution decreased greatly with the increasing of the temperature,and the precipitation rate accelerated with the increasing of the diffusion rate between the solvent and the solidification bath,leading to the thinning surface layer and the rich pore structure.The pure water flux,porosity,water contact angle,retention rate and anti-pollution performance of PSF ultrafiltration membrane increased first and then decreased.When the solidification bath temperature increased,the aperture of the finger pore of polysulfone ultrafiltration membrane became smaller and the surface layer of the membrane became dense.The pure water flux and porosity of PSF ultrafiltration membrane decreased,the total pollution ratio gradually increased and the hydrophilicity became worse.The excellent performance of PSF ultrafiltration membrane was observed at casting solution temperature of 70℃ and the solidification bath temperature of 30℃.
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基金资助
山东省重点研发计划(重大科技创新工程)项目(2022CXGC020416);中国博士后科学基金项目(2023MD734204);陕西省重点产业创新链(群)项目(2022ZDLSF06-05);陕西省教育厅自然科学专项研究计划项目(23JK0458);西安工程大学博士科研启动项目(310/107020512)
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