在非溶剂致相分离制膜过程中,改变刮膜厚度与凝固浴有机组分浓度,考察制膜条件对无纺布复合聚砜(PSF)超滤膜形貌结构、孔隙率、纯水通量、水接触角、机械强度、截留性能及抗污染性能的影响。实验表明,随着凝固浴有机组分浓度的升高,溶剂与非溶剂交换速率减缓,导致膜孔变小、表皮层增厚,拉伸强度和断裂伸长率提高,但纯水通量、孔隙率、亲水性及截留率有所降低。在100μm刮膜厚度下制备的无纺布复合PSF超滤膜孔密度显著高于在200μm刮膜厚度下制备的样品,其孔隙率、纯水通量、水接触角、机械强度、截留性能及抗污染性能均更优。在100μm刮膜厚度下,凝固浴有机组分浓度为30%时,无纺布复合PSF超滤膜的性能最佳。
During the membrane preparation process via non-solvent-induced phase separation,the membrane scraping thickness and the concentration of organic components in the coagulation bath were changed to investigate the effects of membrane formation conditions on the morphology and structure,porosity,pure water flux,water contact angle,mechanical strength,retention performance and anti-pollution performance of nonwoven-supported polysulfone (PSF) ultrafiltration membranes.The results showed the exchange rate between the solvent and the non-solvent slowed down as the organic components of coagulation bath increased,resulting in smaller membrane pores and thicker skin layers,higher tensile strength and elongation at break,but lower pure water flux,porosity,hydrophilicity and retention rate.The pore density of the membranes prepared with a scraping thickness of 100 μm was significantly higher than that of the samples prepared at 200 μm,demonstrating superior porosity,pure water flux,water contact angle,mechanical strength,retention performance and anti-pollution performance.The nonwoven-supported PSF ultrafiltration membrane achieved the best performance at a membrane thickness of 100μm and the concentration of organic components of 30% in the coagulation bath.
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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);西安工程大学博士科研启动项目(301/107020512).
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