典型一價陽離子對蛋白質膜污染的影響特性
發(fā)布時間：2019-03-01 21:41
【摘要】：通過耗散型石英晶體微天平結合自制的聚偏氟乙烯(PVDF)芯片,考察離子強度為0mmol/L及Li Cl、Na Cl、KCl離子強度為100mmol/L條件下,牛血清蛋白(BSA)在PVDF界面的微觀吸附過程及吸附層結構特征,結合宏觀膜污染及膜性能恢復試驗,從微觀角度闡述了膜污染過程中離子水合作用的產生過程及其影響因素,進一步解析了一價陽離子對超濾膜蛋白質污染行為的影響機制.結果表明:與離子強度為0mmol/L時相比,無論是Li~+、Na~+或K~+離子的存在,皆可有效觸發(fā)PVDF-BSA及BSA-BSA之間的水合排斥力,進而減緩BSA在PVDF膜面的吸附累積速率,形成松散的BSA吸附層,相應膜污染減緩.但是Li~+、Na~+及K~+3種陽離子對膜污染的緩減幅度并不相同,離子半徑越小,BSA在膜面的吸附累積速率越慢,吸附層越松散,相應膜不可逆污染越小,說明膜污染幅度與離子半徑成正相關關系,這主要是因為上述3種陽離子所產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.
【作者單位】： 西安建筑科技大學環(huán)境與市政工程學院;
【基金】：國家自然科學基金資助項目(51278408) 中國博士后科學基金資助項目(2015M580820,2016T90895) 陜西省自然科學基金資助項目(2016JQ5067) 陜西省教育廳計劃項目(16JS062) 陜西省高�？茀f青年人才托舉計劃(20160220)
【分類號】：X703.1
，
本文編號：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.
【作者單位】： 西安建筑科技大學環(huán)境與市政工程學院;
【基金】：國家自然科學基金資助項目(51278408) 中國博士后科學基金資助項目(2015M580820,2016T90895) 陜西省自然科學基金資助項目(2016JQ5067) 陜西省教育廳計劃項目(16JS062) 陜西省高�？茀f青年人才托舉計劃(20160220)
【分類號】：X703.1
，
本文編號：2432829
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