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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。
Using zinc nitrate and urea as raw materials, a French product α-alumina tube membrane was modified by homogeneous precipitation method. The structural properties of the films before and after modification were characterized by SEM, FTIR and XRD. The permeation amount of the modified films and the electrophoresis rate of the modified alumina powders were measured. The results showed that a uniform layer of nano-ZnO coating was formed on the surface of alumina film and alumina film after modification, and the grain size was less than 30 nm. The flow potential and the rate of particle electrophoresis Decreased, the permeability of the modified membrane increased by 156%. A significant increase in the amount of modified membrane permeation is believed to be due to an increase in the effective pore size of the membrane and a decrease in the viscosity of the filter media near the inner wall of the membrane pores.