以对-甲基丙烯酰胺基苯磺酸(MABSA)为亲水单体,碱化处理的聚偏氟乙烯(PVDF)为疏水性骨架,偶氮二异丁腈(AIBN)为引发剂,采用自由聚合法制备了两亲性共聚物PVDF-g-PMABSA。将PVDF-g-PMABSA作为添加剂,采用共混改性技术,通过非溶剂致相转化...以对-甲基丙烯酰胺基苯磺酸(MABSA)为亲水单体,碱化处理的聚偏氟乙烯(PVDF)为疏水性骨架,偶氮二异丁腈(AIBN)为引发剂,采用自由聚合法制备了两亲性共聚物PVDF-g-PMABSA。将PVDF-g-PMABSA作为添加剂,采用共混改性技术,通过非溶剂致相转化法(NIPS)制备了PVDF/PVDF-g-PMABSA复合膜。红外光谱(FTIR)和核磁共振氢谱(1 H NMR)分析结果表明,PMABS成功接枝到PVDF主链上。利用X光电子能谱(XPS)、表面接触角(CA)、Zeta电位仪、扫描电镜(SEM)等测定技术对复合膜表面结构和性质进行表征。同时研究了复合膜对牛血清蛋白(BSA)溶液的分离效率和抗污染能力。实验结果表明:当聚合物PVDF-g-PMABSA添加量为3.5%时,复合膜相对原膜,其纯水通量由原膜的63.37L/(m^2·h)增加到136.65L/(m^2·h),通量恢复率由原膜的34.37%增加到85.54%。展开更多
Graphene oxide(GO) has been demonstrated to be an effective hydrophilic nanofiller to modify the polymeric membranes when forming a mixed matrix structure. GO quantum dots(QDs) are promising candidates to fully exert ...Graphene oxide(GO) has been demonstrated to be an effective hydrophilic nanofiller to modify the polymeric membranes when forming a mixed matrix structure. GO quantum dots(QDs) are promising candidates to fully exert the rich oxygen containing functional groups due to their unique size induced edge effects. In this work, GO QDs modified polysulfone(PSF) ultrafiltration(UF) membranes were prepared by phase inversion method with various GO QDs loadings(0.1–0.5 wt.%). A proper amount of GO QDs addition led to a more porous and hydrophilic membrane structure. With 0.3 wt.% GO QDs, the membranes showed a60% increase in permeability(130.54 vs. 82.52 LMH bar^-1).The pristine PSF membranes had a complete cutoff of bovine serum albumin molecules and it was well maintained with GO QDs incorporated. The membranes with 0.5 wt.% GO QDs exhibited the highest flux recovery ratio of 89.7% and the lowest irreversible fouling of 10.3%(54.5% and 33.3% for the pristine PSF membranes). Our results proved that GO QDs can function as effective nanofillers to enhance the hydrophilicity, permeability and antifouling performance of PSF UF membranes.展开更多
文摘以对-甲基丙烯酰胺基苯磺酸(MABSA)为亲水单体,碱化处理的聚偏氟乙烯(PVDF)为疏水性骨架,偶氮二异丁腈(AIBN)为引发剂,采用自由聚合法制备了两亲性共聚物PVDF-g-PMABSA。将PVDF-g-PMABSA作为添加剂,采用共混改性技术,通过非溶剂致相转化法(NIPS)制备了PVDF/PVDF-g-PMABSA复合膜。红外光谱(FTIR)和核磁共振氢谱(1 H NMR)分析结果表明,PMABS成功接枝到PVDF主链上。利用X光电子能谱(XPS)、表面接触角(CA)、Zeta电位仪、扫描电镜(SEM)等测定技术对复合膜表面结构和性质进行表征。同时研究了复合膜对牛血清蛋白(BSA)溶液的分离效率和抗污染能力。实验结果表明:当聚合物PVDF-g-PMABSA添加量为3.5%时,复合膜相对原膜,其纯水通量由原膜的63.37L/(m^2·h)增加到136.65L/(m^2·h),通量恢复率由原膜的34.37%增加到85.54%。
基金supported by Beijing Natural Science Foundation(2172027)
文摘Graphene oxide(GO) has been demonstrated to be an effective hydrophilic nanofiller to modify the polymeric membranes when forming a mixed matrix structure. GO quantum dots(QDs) are promising candidates to fully exert the rich oxygen containing functional groups due to their unique size induced edge effects. In this work, GO QDs modified polysulfone(PSF) ultrafiltration(UF) membranes were prepared by phase inversion method with various GO QDs loadings(0.1–0.5 wt.%). A proper amount of GO QDs addition led to a more porous and hydrophilic membrane structure. With 0.3 wt.% GO QDs, the membranes showed a60% increase in permeability(130.54 vs. 82.52 LMH bar^-1).The pristine PSF membranes had a complete cutoff of bovine serum albumin molecules and it was well maintained with GO QDs incorporated. The membranes with 0.5 wt.% GO QDs exhibited the highest flux recovery ratio of 89.7% and the lowest irreversible fouling of 10.3%(54.5% and 33.3% for the pristine PSF membranes). Our results proved that GO QDs can function as effective nanofillers to enhance the hydrophilicity, permeability and antifouling performance of PSF UF membranes.
