溶胶—凝胶法制备纳米ZnO涂层修饰陶瓷微滤膜研究

发布时间：2018-05-02 20:12

  本文选题：Al_2O_3微滤膜 + ZnO改性　； 参考：《景德镇陶瓷学院》2010年硕士论文

【摘要】： 微滤复合陶瓷膜在液体分离、生物化工、环保等领域有着广泛的应用前景。但价格昂贵、分离效率低的状况仍是当今膜科学研究的一个重要课题。利用金属氧化物对微滤陶瓷复合膜进行修饰改性不仅可以改善它的物化性能,而且还可以显著提高无机膜分离效率,因此,进行微滤陶瓷复合膜的改性及其调控方法研究,将为微滤陶瓷膜的应用建立坚实的技术平台。 本论文以Zn(OAc)2为前驱体,乙二醇甲醚为溶剂,一乙醇胺为稳定剂,首次采用溶胶-凝胶法制备ZnO改性溶胶,以Al2O3微滤膜(孔径φ=0.89μm)作为基体进行其孔道内壁修饰改性,对影响ZnO改性溶胶的反应温度、反应物浓度、溶胶陈化时间等工艺因素进行了详细探讨,测试了Al2O3微滤膜改性前后的孔径和水通量变化,运用TEM、SEM、Zeta电位等对改性后的微滤膜进行检测分析。研究结果表明:在水浴温度为65℃,改性溶胶中Zn2+改性溶胶浓度为0.2mol/L,pH为3,溶胶陈化时间为72小时,经600℃焙烧改性样品,可在微滤膜孔道内壁获得一层晶粒为5～15nm、厚度为15nm左右的纳米ZnO改性涂层。在微滤膜孔径减小7%的情况下,改性后的微滤膜水通量有显著的提高,最大提高幅度为151.8%。 为对ZnO改性涂层进行性能调控,本文在溶胶-凝胶法制备ZnO改性溶胶最佳工艺条件基础上,进行了Ag离子掺杂研究。通过掺杂不同量Ag离子,测试Ag离子掺杂ZnO改性的孔径和水通量变化,以及Ag离子掺杂ZnO改性涂层的Zeta电位大小,着重探讨了掺杂改性涂层Zeta电位与微滤膜过滤通量的关系。当过滤介质蒸馏水的pH=7时,以掺杂Ag离子摩尔比(Ag+:Zn2+)为0.2的ZnO颗粒的Zeta电位最高且水通量提高幅度最大。实验结果发现:由Ag离子掺杂ZnO纳米晶粒所构成的改性涂层同样具有提高微滤陶瓷膜水通量的功能,比未改性的水通量提高幅度最大为187.96%,效果比单独用ZnO改性明显。
[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，

本文编号：1835315