纳米氧化锌对α-氧化铝管膜的改性研究

以硝酸锌和尿素为原料,采用均相沉淀法对一种法国商品α-氧化铝管膜进行改性。用SEM、FTIR、XRD等分析手段对改性前后的膜的结构性能进行了表征;测定了改性膜的渗透量及改性氧化铝粉体的电泳速率。结果表明:改性后在氧化铝膜层和氧化铝颗粒表面形成了一层均匀的纳米氧化锌涂层,其晶粒小于30纳米;改性后膜的流动电位及颗粒的电泳速率均有显著的降低,改性膜的渗透量提高156%。改性膜渗透量的显著提高被认为是由于膜的有效孔径增大和膜孔内壁附近过滤介质粘度降低所致。

Study on the Modification of Alpha-alumina Tubular Membrane with Nano Zinc Oxide

A French commercial available alpha-alumina tubular membrane was modified with nano zinc oxide prepared by homogeneous precipitation process using urea and zinc nitrate as raw materials. The modified membrane was characterized with SEM、FTIR、XRD and the influences of the modification on the streaming potential of the alumina membrane and electrophoretic mobility of alumina grains were investigated. The results showed that after modification there was a nano zinc oxide coating with grain size of less than 30nm formed on the alumina grains ' surface and the streaming potential of the modified membrane decreased, so as for the electrophoretic mobility of the alumina grains. The stabilized permeability of the modified membrane had an increase of 156%. It is pointed that this great increase of permeability is due to the increase of membrane's effective pore radius and the decrease of water viscusity near pore walls of membranes.