论文部分内容阅读
釆用商品级α-Al2O3微滤膜,由均质共沉淀法制备了TiO2改性α-Al2O3微滤膜。研究了不同的电解质溶液、溶液的离子浓度和pH值对TiO2改性的α-Al2O3微滤膜流动电势的影响规律。结果表明:对于NaCl溶液,膜流动电势随溶液离子浓度的增大而降低,其等电点在4.3左右;随着溶液的pH值由3增加到10,膜流动电势由正值逐渐变为负值。而对于FeSO4,CaSO4,Na2SO4,NaCl和CaCl2溶液,当溶液的离子浓度固定时,膜流动电势则随溶液的电导率的增加而降低。
Preclude the use of commercial grade α-Al2O3 microfiltration membrane, prepared by the homogeneous coprecipitation TiO2 modified α-Al2O3 microfiltration membrane. The effects of different electrolyte solutions, ionic strength and pH value of solution on the flow potential of α-Al2O3 modified by TiO2 were studied. The results show that the membrane potential decreases with the increase of solution ion concentration, and the isoelectric point is about 4.3. With the solution pH increasing from 3 to 10, the membrane potential decreases from positive to negative value. For FeSO4, CaSO4, Na2SO4, NaCl and CaCl2 solutions, the membrane potential decreases with the increase of solution conductivity when the ion concentration is fixed.