本文選題：非均相膜表面　切入點(diǎn)：表面偏析　出處：《天津大學(xué)》2015年博士論文

【摘要】：膜表面抗污染性能強(qiáng)化是獲得高性能膜材料主要策略之一,而膜表面微結(jié)構(gòu)和抗污染機(jī)制是決定膜抗污染性能的兩個(gè)關(guān)鍵科學(xué)問題,本文以表面偏析、表面接枝、仿生礦化為平臺(tái)技術(shù),建立了超濾膜表面非均相結(jié)構(gòu)可控構(gòu)建方法,提出了膜表面多重抗污染機(jī)制協(xié)同強(qiáng)化理論,以期為面向水處理過程抗污染膜材料的設(shè)計(jì)制備提供創(chuàng)新學(xué)術(shù)思想。主要研究?jī)?nèi)容及主要結(jié)論概述如下:膜表面非均相結(jié)構(gòu)構(gòu)建與“污染驅(qū)除”機(jī)制強(qiáng)化:(i)基于表面偏析現(xiàn)象和原理構(gòu)建了含親水鏈段和低表面能含氟鏈段的膜表面非均相結(jié)構(gòu)。膜表面含氟鏈段的強(qiáng)制表面偏析可構(gòu)建低表面能屏障以降低蛋白質(zhì)與膜表面的相互作用,強(qiáng)化“污染驅(qū)除”機(jī)制;(ii)基于表面接枝方法和原理構(gòu)建了含親水基團(tuán)和低表面能全氟基團(tuán)的膜表面非均相結(jié)構(gòu)。膜表面全氟基團(tuán)的引入可構(gòu)建低表面能屏障以降低油滴、蛋白質(zhì)及多糖與膜表面的相互作用,強(qiáng)化“污染驅(qū)除”機(jī)制。膜表面非均相結(jié)構(gòu)構(gòu)建與多重抗污染機(jī)制協(xié)同強(qiáng)化:(i)基于表面偏析現(xiàn)象和原理構(gòu)建了含親水鏈段和低表面能含硅鏈段的膜表面非均相結(jié)構(gòu)。膜表面含硅鏈段的強(qiáng)制表面偏析可構(gòu)建低表面能屏障以降低生物污染物與膜表面的相互作用,親水鏈段的自由表面偏析可構(gòu)建水化層屏障以阻礙生物污染物與膜表面的直接接觸,實(shí)現(xiàn)多重抗污染機(jī)制協(xié)同強(qiáng)化;(ii)基于表面偏析現(xiàn)象和原理提出了配位作用調(diào)控的協(xié)同表面偏析改性方法,構(gòu)建了含親水鏈段、無機(jī)納米粒子和低表面能含氟鏈段的膜表面非均相結(jié)構(gòu)。膜表面含氟鏈段的強(qiáng)制表面偏析可構(gòu)建低表面能屏障以降低油滴與膜表面的相互作用,親水鏈段和無機(jī)納米粒子的協(xié)同表面偏析可強(qiáng)化水化層屏障以抵御油滴與膜表面直接接觸,實(shí)現(xiàn)多重抗污染機(jī)制協(xié)同強(qiáng)化;(iii)基于生物礦化現(xiàn)象和原理,通過仿生礦化法構(gòu)建了含親水性無機(jī)納米粒子和低表面能含氟基團(tuán)的膜表面非均相結(jié)構(gòu)。膜表面親水性無機(jī)納米粒子的原位礦化可構(gòu)建水化層屏障以抵御油滴與膜表面直接接觸,含氟基團(tuán)的引入可構(gòu)建低表面能屏障以降低油滴與膜表面的相互作用,實(shí)現(xiàn)多重抗污染機(jī)制協(xié)同強(qiáng)化。
[Abstract]:The enhancement of membrane surface antifouling property is one of the main strategies to obtain high performance membrane materials. The microstructure and anti-fouling mechanism of membrane surface are two key scientific problems in determining the membrane anti-fouling performance. In this paper, surface segregation and surface grafting are used to determine the anti-fouling performance of membranes. Biomimetic mineralization is used as platform technology to establish a controllable construction method for heterogeneous structure of ultrafiltration membrane surface. The theory of multi-layer anti-fouling mechanism synergistic strengthening of membrane surface is put forward. In order to provide innovative academic ideas for the design and preparation of antifouling membrane materials for water treatment process, the main research contents and main conclusions are summarized as follows: the construction of heterogeneous phase structure of membrane surface and the mechanism of "decontamination" strengthen the mechanism of "decontamination" based on. Surface segregation phenomenon and principle have been used to construct the heterogeneous structure of membrane surface containing hydrophilic chain and low surface energy fluorine chain segment. The forced surface segregation of fluorine chain segment on membrane surface can construct low surface energy barrier to reduce the interaction between protein and membrane surface. Based on the method and principle of surface grafting, the heterogeneous structure of membrane surface containing hydrophilic group and low surface energy perfluoro group was constructed. The introduction of perfluoro group on membrane surface can construct low surface energy barrier to reduce oil droplet. The interaction of proteins and polysaccharides with the surface of the membrane, Strengthening the mechanism of "decontamination". Construction of heterogeneous structure of membrane surface and synergistic strengthening of multilayer anti-fouling mechanism: based on surface segregation phenomenon and principle, the heterogeneous junction of membrane surface containing hydrophilic chain and low surface energy silicon-containing chain was constructed. The forced surface segregation of silicon-containing segments on the membrane surface can construct low surface energy barriers to reduce the interaction between biological pollutants and the membrane surface. The free surface segregation of hydrophilic chain can construct hydration layer barrier to prevent the direct contact between biological pollutants and membrane surface. Based on the phenomenon and principle of surface segregation, the coordinated surface segregation modification method for coordination regulation was proposed, and the hydrophilic chain segment was constructed. Inorganic nanoparticles and the heterogeneous structure of the membrane surface with low surface energy containing fluorine chain segment. The forced surface segregation of the fluorine chain segment on the membrane surface can construct a low surface energy barrier to reduce the interaction between oil droplets and the membrane surface. The synergistic surface segregation of hydrophilic chain and inorganic nanoparticles can strengthen the hydration layer barrier to resist the direct contact between oil droplets and the membrane surface. The heterogeneous structure of membrane surface containing hydrophilic inorganic nanoparticles and low surface energy fluorine groups was constructed by biomimetic mineralization method. In situ mineralization of hydrophilic inorganic nanoparticles on membrane surface can construct hydration layer barrier to resist oil droplets. Direct contact with the surface of the membrane, The introduction of fluorine groups can construct low surface energy barrier to reduce the interaction between oil droplets and membrane surface and realize the synergistic strengthening of multiple antifouling mechanisms.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ051.893
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本文編號(hào)：1679819