本文選題：Al_2O_3微濾膜 + ZnO改性��； 參考：《景德鎮(zhèn)陶瓷學(xué)院》2010年碩士論文

【摘要】： 微濾復(fù)合陶瓷膜在液體分離、生物化工、環(huán)保等領(lǐng)域有著廣泛的應(yīng)用前景。但價(jià)格昂貴、分離效率低的狀況仍是當(dāng)今膜科學(xué)研究的一個(gè)重要課題。利用金屬氧化物對(duì)微濾陶瓷復(fù)合膜進(jìn)行修飾改性不僅可以改善它的物化性能,而且還可以顯著提高無(wú)機(jī)膜分離效率,因此,進(jìn)行微濾陶瓷復(fù)合膜的改性及其調(diào)控方法研究,將為微濾陶瓷膜的應(yīng)用建立堅(jiān)實(shí)的技術(shù)平臺(tái)。 本論文以Zn(OAc)2為前驅(qū)體,乙二醇甲醚為溶劑,一乙醇胺為穩(wěn)定劑,首次采用溶膠-凝膠法制備ZnO改性溶膠,以Al2O3微濾膜(孔徑φ=0.89μm)作為基體進(jìn)行其孔道內(nèi)壁修飾改性,對(duì)影響ZnO改性溶膠的反應(yīng)溫度、反應(yīng)物濃度、溶膠陳化時(shí)間等工藝因素進(jìn)行了詳細(xì)探討,測(cè)試了Al2O3微濾膜改性前后的孔徑和水通量變化,運(yùn)用TEM、SEM、Zeta電位等對(duì)改性后的微濾膜進(jìn)行檢測(cè)分析。研究結(jié)果表明:在水浴溫度為65℃,改性溶膠中Zn2+改性溶膠濃度為0.2mol/L,pH為3,溶膠陳化時(shí)間為72小時(shí),經(jīng)600℃焙燒改性樣品,可在微濾膜孔道內(nèi)壁獲得一層晶粒為5～15nm、厚度為15nm左右的納米ZnO改性涂層。在微濾膜孔徑減小7%的情況下,改性后的微濾膜水通量有顯著的提高,最大提高幅度為151.8%。 為對(duì)ZnO改性涂層進(jìn)行性能調(diào)控,本文在溶膠-凝膠法制備ZnO改性溶膠最佳工藝條件基礎(chǔ)上,進(jìn)行了Ag離子摻雜研究。通過摻雜不同量Ag離子,測(cè)試Ag離子摻雜ZnO改性的孔徑和水通量變化,以及Ag離子摻雜ZnO改性涂層的Zeta電位大小,著重探討了摻雜改性涂層Zeta電位與微濾膜過濾通量的關(guān)系。當(dāng)過濾介質(zhì)蒸餾水的pH=7時(shí),以摻雜Ag離子摩爾比(Ag+:Zn2+)為0.2的ZnO顆粒的Zeta電位最高且水通量提高幅度最大。實(shí)驗(yàn)結(jié)果發(fā)現(xiàn):由Ag離子摻雜ZnO納米晶粒所構(gòu)成的改性涂層同樣具有提高微濾陶瓷膜水通量的功能,比未改性的水通量提高幅度最大為187.96%,效果比單獨(dú)用ZnO改性明顯。
[Abstract]:Micro-filtration composite ceramic membrane has a wide application prospect in liquid separation, biochemical, environmental protection and other fields. However, the situation of high price and low separation efficiency is still an important subject in membrane science. The modification of microfiltration ceramic composite membrane by metal oxide can not only improve its physical and chemical properties, but also improve the separation efficiency of inorganic membrane. Therefore, the modification and control methods of microfiltration ceramic composite membrane are studied. A solid technical platform will be established for the application of microfiltration ceramic membrane. In this paper, Zn(OAc)2 was used as precursor, ethylene glycol as solvent and monoethanolamine as stabilizer. ZnO modified sol was prepared by sol-gel method for the first time. Al2O3 microfiltration membrane (pore diameter 蠁 0.89 渭 m) was used as matrix to modify the inner wall of ZnO. The factors affecting the reaction temperature, reactant concentration and aging time of ZnO modified sol were discussed in detail. The changes of pore size and water flux before and after modification of Al2O3 microfiltration membrane were tested. The modified microfiltration membrane was analyzed by using the Zeta potential of the modified membrane. The results showed that the temperature of water bath was 65 鈩，

本文編號(hào)：1835315