本文選題：界面聚合 + 納米復合膜�。� 參考：《浙江工業(yè)大學》2017年碩士論文

【摘要】：二氧化鈦納米粒子由于其出色的親水性和光催化性能,而被廣泛應用于納米復合膜的制備當中,來提高膜的抗污染性和分離性能。但是,納米顆粒的團聚現(xiàn)象是制備摻雜納米顆粒的復合膜中不得不面對的問題。一些研究者通過對納米顆粒表面的改性來改善分散性,并取得了一定的效果。然而這樣做不僅步驟繁瑣,而且也損失了一部分納米顆粒的親水性。本文采用鈦酸四丁酯(TBOT)代替二氧化鈦納米顆粒添加到TMC油相中。TBOT在油相中溶解性很好,并能在界面聚合的同時水解生成二氧化鈦,這提高了二氧化鈦在復合膜中的分散性,并有效抑制團聚的發(fā)生。與其它減少團聚的方法相比,這更加簡單有效,并且容易工業(yè)化。首先以哌嗪PIP為水相單體,均苯三甲酰氯TMC為油相單體,在油相中添加TBOT,通過原位合成TiO_2的方法制備了新型納米復合納濾膜。對原位生成的二氧化鈦進行表征分析,研究了TBOT添加量對納米復合膜性能和結(jié)構(gòu)的影響。優(yōu)化了界面聚合工藝條件:PIP濃度為2g/L,TMC濃度為1 g/L,TBOT添加量為250 mg/L,熱處理條件為80℃,10 min時,所制備的納米復合納濾膜性能最佳,Na2SO4和NaCl的截留率分別為95.3%和54.1%,純水通量為78 L/m~2h(1 MPa,2000 ppm)。復合膜表征實驗結(jié)果顯示,在TBOT添加量較少時,TFN膜表面二氧化鈦納米顆粒分散較好,并未發(fā)現(xiàn)明顯團聚。通過相同的界面聚合工藝條件制備了直接在油相和水相添加二氧化鈦的兩種傳統(tǒng)納米復合膜,并且進行膜性能和結(jié)構(gòu)上的對比。實驗結(jié)果表明,原位生成二氧化鈦制備的新型TFN膜具有更出色的分離性能。用X射線光電子能譜(XPS)、原子力顯微鏡(AFM)、掃描電子顯微鏡(SEM)和靜態(tài)接觸角表征了復合膜,結(jié)果顯示這得益于在界面聚合的同時原位生成納米顆粒在膜中具有出色的分散性,并且有效的抑制了團聚的發(fā)生。同時在復合膜表面粗糙度增加和親水性提高的雙重作用下,新型納米復合膜在通量大幅提升的同時又保持了很高的截留率。最后將制備的新型納米復合納濾膜應用到染料脫鹽中,并進行了耐污染性能測試,顯示了比較理想的染料分離性能。
[Abstract]:Titanium dioxide nanoparticles have been widely used in the preparation of nanocomposite membranes because of their excellent hydrophilicity and photocatalytic properties to improve the fouling resistance and separation performance of the membranes. However, the agglomeration of nanocrystalline particles is a problem to be faced in the preparation of composite films doped with nano-particles. Some researchers improve the dispersion by modifying the surface of nanoparticles and obtain certain results. However, this process is not only cumbersome, but also lose some of the hydrophilicity of nanoparticles. In this paper, tetrabutyl titanate (TBOT) was added to the oil phase of TMC instead of titanium dioxide nanoparticles. TBOT has good solubility in the oil phase and can hydrolyze to form titanium dioxide at the same time of interfacial polymerization, which improves the dispersion of titanium dioxide in the composite film. And effectively inhibit the occurrence of agglomeration. This is simpler and more effective than other ways to reduce agglomeration, and it is easy to industrialize. A novel nano-composite nanofiltration membrane was prepared by in-situ synthesis of TiO2 with piperazine PIP as aqueous phase monomer and benzoyl chloride TMC as oil phase monomer and TBOT added in oil phase. The in-situ formation of titanium dioxide was characterized and the effect of Tbot addition on the properties and structure of nanocomposite films was studied. The optimum conditions of interfacial polymerization were optimized when the concentration of 2 g / L PIP was 2 g / L, the concentration of TBOT was 1 g / L, the amount of TBOT was 250mg / L, and the heat treatment condition was 80 鈩，

本文編號：2043225