Abstract
Ultrafiltration membrane can’t filtrate particles of ion level, but after modification it can reach the ability of rejection as high as the nanofiltration membrane. In view of the research publish by others I know there are three kind of effect will occur and had action to the ion in the solution when modifying membrane in different situation, respectively absorption, attractive force and repulsion. I use membrane modified in different pH and use different pH solution which has Co2+ to conduct our experiments by realizing the permeate flux and rejection. Later, I adopt Poiseuille Equation to gain the viscosities of different pH solution including Co2+ and furthermore to observe the effect of permeate flux and rejection caused by electroviscous with this equation. I also conduct BET and LA-ICP-MS depth profile to understand the pore size and the Co2+ absorption situation of membrane surface after filtration. Overall, our research base on the above to establish the relationships between electroviscous, pore size and permeate flux, rejection, viscosity.