摘要
以微孔硅藻土陶瓷膜为基膜,YCl_3和NaOH反应制备的纳米Y_2O_3为荷电剂,经浸渍-热分解法制备荷正电微孔陶瓷膜.通过TGA、SEM、EDS、Zeta电位分析等手段对其组成和结构进行表征.结果显示,制备荷电剂的煅烧温度为700℃时,前驱体完全转化为纳米Y_2O_3,平均粒径约为118nm,且Y_2O_3晶粒生长良好;荷电膜微孔结构保持良好,纳米Y_2O_3均匀地附着在基膜表面;荷电膜在pH为4~8范围内带正电性,其等电点为8.11.荷电膜的正电性能预示着其在去除水中带负电荷的细菌、病毒及有机染料等方面具有很大的应用前景.
By the way of dipping-thermal decomposition, positively charged microporous ceramic membranes were prepared in this study which selected microporous diatomite as based-membrane and nanoY_2O_3 as charged agent.Nano-Y_2O_3 was synthesized through the reaction of YCl_3 and NaOH.The composition and structure of charged membrane were characterized by TGA、XRD、SEM、EDS、Zeta potential and so on.These results indicated that the precursor completely transformed into nano-Y_2O_3 with average particle size 118 nm when calcined at 700 ℃.The crystal of nano-Y_2O_3 grew well.Pore structure of charged membrane kept fine.And nano-Y_2O_3 attached uniformly on the membrane surface.In the pH range of 4~8,charged membrane with an isoelectric point of 8.11 possessed strongly positive electricity.The positive performance of charged membrane predicts a great application prospect in terms of removing negative charged microorganism,bacteria,viruses and organic dyes and so on.
引文
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