Abstract: Cuprous oxide mircocrystals were synthesized with a simple liquid membrane- reaction method. The effects of the reaction conditions such as reductant species，concentration of reactants across the membrane and reaction temperature on the size，morphology and crystal structure of Cu₂O were explored with XRD and SEM. With reactive brilliant red X-3B（X-3B）as a model pollutant，the adsorption and visible- light photocatalytic decolorization performances of prepared Cu₂O were investigated. The results showed that Cu₂O mircocrystals prepared with liquid membrane- reaction method were octahedral structure with rough surface when glucose was used as a reducing agent，initial concentration ratio of copper ion and sodium hydroxide was 1∶3 and the reduction temperature was 50 ℃ ，meanwhile they had good adsorption and visible- light photocatalytic properties，and the photocatalytic decolorization rate of X-3B was up to 70%.

Key words: Cu₂O, membrane reactor, photocatalysis, synthesis