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离子交换膜分离机制的理论分析Analysis of the Separation Mechanism of Ion Exchange Membrane
彭亚洲, 谢德华, 任伯帜
离子交换膜, 唐南透析, 化学势平衡Ion Exchange Membrane, Donnan Dialysis, Chemical Potential Equilibrium
《Advances in Environmental Protection》, Vol.6 No.2, 2016-04-07
This paper, based on Donnan dialysis and chemical potential equilibrium principle, theoretically investigates the three states of ion exchange membrane without external supply of electricity: the rate of ion transport is slow thus is the deterministic step, while the transport in the boundary layer is rapid and much faster than that in the membrane; the transport rate in the membrane is much faster than that in the boundary layer, which is the deterministic step; both the transport rates in membrane and boundary layer are the deterministic steps. And in this paper, the three states are discussed and the conclusion is reached that assuming temperature, pressure and other influential factors remains constant, among the three states mentioned above, the first state is suitable when the concentration of driving ion and feed ion is very high, the second is suitable when the concentration of the two ions is very low and the third is suitable when the concentration is medium. The relationship between the range of concentration and its corresponding state may relate with ion type, ion charge and the nature of membrane itself, and needs further investigation.