论文部分内容阅读
采用挤压成型和流铸法制备了ZrO2/堇青石微滤膜,并通过错流方式下的流动电势测量对所制备微滤膜的表面荷电性能进行了表征。研究了过滤介质溶液的pH值、电解质种类和浓度等对膜的表面荷电性能和渗透通量的影响。结果表明:膜流动电势大小取决于过滤溶液的pH值、电解质种类和浓度。溶液浓度为10-3mol/L时,膜等电点随着电解质种类改变而在4.2和5.4之间变化。膜的流动电势随NaCl溶液浓度提高而逐渐减小,但等电点不变;而CaCl2和Na2SO4溶液中的Ca2+和SO42-在膜孔表面存在特定吸附,导致膜的等电点和表面净电荷符号改变。制备的ZrO2/堇青石微滤膜在等电点附近出现最大离子溶液过滤通量。
The ZrO2 / cordierite microfiltration membrane was prepared by extrusion molding and flow casting. The surface charge performance of the prepared microfiltration membrane was characterized by flow potential measurement under cross flow. The effects of the pH value of the filter medium solution, electrolyte type and concentration on the surface charge performance and permeation flux of the membrane were investigated. The results show that the membrane potential depends on the pH of the filtration solution, the type and concentration of electrolyte. When the solution concentration is 10-3mol / L, the isoelectric point of the membrane changes between 4.2 and 5.4 with the change of electrolyte type. The flow potential of the membrane decreases with increasing concentration of NaCl solution, but the isoelectric point is not changed. However, Ca2 + and SO42- in CaCl2 and Na2SO4 solution have specific adsorption on the membrane pore surface, resulting in the isoelectric point of the membrane and the surface net charge Symbol changes. Preparation of ZrO2 / cordierite microfiltration membrane in the vicinity of the isoelectric point of the maximum ionic solution filtration flux.