离子交换膜应用于光/电/化学协同催化反应器

在光/电/化学协同催化反应器中,以离子交换膜代替盐桥连通阴、阳两室,以30 mg/L的甲基红溶液为目标降解物,考察了不同连通方式、初始pH和阴极电位对反应的影响.结果表明:甲基红在阳离子膜型反应器中的表观反应速率常数明显高于盐桥型及阴离子交换膜型反应器,这是由于阳离子交换膜可以及时有效地将阳极室中产生的H+转移至阴极室中参与阴极反应.甲基红在阳离子膜型反应器中的去除率随溶液初始pH的增高而降低,随阴极电位的增加先增大后减小,最佳反应条件为pH=2.0～3.0,阴极电位(-Ec)=0.6 V.

Application of an Ion-Exchange Membrane to a Photo-Electro-Chemical Catalytic Reactor

A novel photo-electro-chemical catalytic reactor,in which the anodic and cathodal tanks were connected by an ion-exchange membrane instead of a salt bridge with a double tank,was designed.The influence of different connectivity modes,initial pH and cathode potential on the degradation of methyl red(MR) with initial concentration of 30 mg /L was investigated.The results showed that the apparent reaction rate constant in the reactor with the cation-exchange membrane was significantly higher than those in the reactors with the salt bridge or anion-exchange membranes.This is due to the fact that hydrogen ions could be transferred from the anodic tank to the cathodic tank by the cation-exchange membrane,and then participate in the cathodic reaction.The degradation of MR decreased with the increase of initial pH,but increased at first and then decreased with the increase of cathodic potential in the reactor with the cation-exchange membrane.The optimum reactive conditions were pH 2.0-3.0 and cathodic potential 0.6 V.