典型一价阳离子对蛋白质膜污染的影响特性
发布时间：2019-03-01 21:41
【摘要】：通过耗散型石英晶体微天平结合自制的聚偏氟乙烯(PVDF)芯片,考察离子强度为0mmol/L及Li Cl、Na Cl、KCl离子强度为100mmol/L条件下,牛血清蛋白(BSA)在PVDF界面的微观吸附过程及吸附层结构特征,结合宏观膜污染及膜性能恢复试验,从微观角度阐述了膜污染过程中离子水合作用的产生过程及其影响因素,进一步解析了一价阳离子对超滤膜蛋白质污染行为的影响机制.结果表明:与离子强度为0mmol/L时相比,无论是Li~+、Na~+或K~+离子的存在,皆可有效触发PVDF-BSA及BSA-BSA之间的水合排斥力,进而减缓BSA在PVDF膜面的吸附累积速率,形成松散的BSA吸附层,相应膜污染减缓.但是Li~+、Na~+及K~+3种阳离子对膜污染的缓减幅度并不相同,离子半径越小,BSA在膜面的吸附累积速率越慢,吸附层越松散,相应膜不可逆污染越小,说明膜污染幅度与离子半径成正相关关系,这主要是因为上述3种阳离子所产生的水合排斥力不同所致.
[Abstract]:By means of dissipative quartz crystal microbalance and self-made polyvinylidene fluoride (PVDF) chip, the ionic strength of 0mmol/L and Li Cl,Na Cl,KCl were investigated, and the ionic strength of PVDF was 100mmol/L. The microcosmic adsorption process of bovine serum protein (BSA) at the PVDF interface and the structural characteristics of the adsorption layer were studied. Combined with the macroscopical membrane fouling and membrane performance recovery test, the formation process of ion hydration in the membrane fouling process and its influencing factors were expounded from the microcosmic point of view. The mechanism of the influence of monovalent cations on the fouling behavior of ultrafiltration membrane was further analyzed. The results show that the hydration repulsive force between PVDF-BSA and BSA-BSA can be effectively triggered by the presence of Li~, Na~ or K ~ + when the ionic strength is 0mmol/L, and the adsorption accumulation rate of BSA on the PVDF surface can be slowed down. A loose layer of BSA adsorption was formed, and the corresponding membrane fouling was slowed down. However, Li~, Na~ and K~ 3 cations have different degrees of decrease in membrane fouling. The smaller the ion radius, the slower the adsorption accumulation rate of BSA on the membrane surface, the looser the adsorption layer, and the smaller the irreversible fouling of the corresponding membrane, the smaller the ionic radius is, the slower the adsorption accumulation rate is on the surface of the membrane. It is concluded that the fouling amplitude of the membrane is positively correlated with the ion radius, which is mainly due to the different hydration repulsive forces produced by the above three cations.
【作者单位】： 西安建筑科技大学环境与市政工程学院;
【基金】：国家自然科学基金资助项目(51278408) 中国博士后科学基金资助项目(2015M580820,2016T90895) 陕西省自然科学基金资助项目(2016JQ5067) 陕西省教育厅计划项目(16JS062) 陕西省高校科协青年人才托举计划(20160220)
【分类号】：X703.1
，
本文编号：2432829
[Abstract]:By means of dissipative quartz crystal microbalance and self-made polyvinylidene fluoride (PVDF) chip, the ionic strength of 0mmol/L and Li Cl,Na Cl,KCl were investigated, and the ionic strength of PVDF was 100mmol/L. The microcosmic adsorption process of bovine serum protein (BSA) at the PVDF interface and the structural characteristics of the adsorption layer were studied. Combined with the macroscopical membrane fouling and membrane performance recovery test, the formation process of ion hydration in the membrane fouling process and its influencing factors were expounded from the microcosmic point of view. The mechanism of the influence of monovalent cations on the fouling behavior of ultrafiltration membrane was further analyzed. The results show that the hydration repulsive force between PVDF-BSA and BSA-BSA can be effectively triggered by the presence of Li~, Na~ or K ~ + when the ionic strength is 0mmol/L, and the adsorption accumulation rate of BSA on the PVDF surface can be slowed down. A loose layer of BSA adsorption was formed, and the corresponding membrane fouling was slowed down. However, Li~, Na~ and K~ 3 cations have different degrees of decrease in membrane fouling. The smaller the ion radius, the slower the adsorption accumulation rate of BSA on the membrane surface, the looser the adsorption layer, and the smaller the irreversible fouling of the corresponding membrane, the smaller the ionic radius is, the slower the adsorption accumulation rate is on the surface of the membrane. It is concluded that the fouling amplitude of the membrane is positively correlated with the ion radius, which is mainly due to the different hydration repulsive forces produced by the above three cations.
【作者单位】： 西安建筑科技大学环境与市政工程学院;
【基金】：国家自然科学基金资助项目(51278408) 中国博士后科学基金资助项目(2015M580820,2016T90895) 陕西省自然科学基金资助项目(2016JQ5067) 陕西省教育厅计划项目(16JS062) 陕西省高校科协青年人才托举计划(20160220)
【分类号】：X703.1
，
本文编号：2432829
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