Photocatalytic Degradation of Coking Wastewater by Ce-Ti-Graphene Composite

Photocatalytic technology has bright prospects in the field of coking wastewater treatment. UV spectrophotometer is used to test the photodegradation of 10 mol/L rhodamine B solution on the self-built photocatalytic platform. The photocatalytic properties of 7 kinds of catalysts are compared and analyzed. The results show that after the 30min simulation of sunlight, the photocatalytic effect from the best to the worst is 10%CeO₂-TiO₂/10% RGO >5% CeO₂-TiO₂/10% RGO >1% CeO₂-TiO₂/10% RGO >TiO₂/10% RGO >10% CeO₂-TiO₂. In the case of the TiO₂ composite with single modified materials of the same mass, the composite with graphene has better photocatalytic properties than the composite with CeO₂ while the TiO₂ composite with two modified materials shows better photocatalytic effect than that with only one single material, and the samples with more CeO₂ have more excellent photocatalytic properties in the case of the same mass of graphene. And the photocatalytic performance of 10%CeO₂-TiO₂/10%RGO composites is the best, whose photocatalytic degradation is 6.71 times that of pure TiO₂. The results show that the composite of graphene and CeO₂ effectively improves the photocatalytic efficiency and improves the defects of TiO₂ to a certain extent. (paper)