Study on treatment of chromium wastewater by co-doped titanium-bearing blast furnace slag photocatalyst

For further solve the problem of high value-added application of rare metals in titanium-containing blast furnace slag. cobalt-doped titanium-containing blast furnace slag photocatalyst was prepared by liquid phase method with titanium-containing blast furnace slag, cobalt nitrate and nitric acid as ingredients. The potassium dichromate solution was used as the target pollutant for photocatalytic degradation under ultraviolet light. The effects of simulated solution pH, original concentration of Cr⁶⁺ and catalyst quantity on the photocatalytic degradation of Cr6 + were studied. The results show that the cobalt-doped titanium-containing blast furnace slag photocatalyst has better light response in the ultraviolet region. The degradation rate of Cr6+ reached to 92.68%, when simulated effluent pH was 1.0, photocatalyst additive amount was 0.50 g•L^-1, original concentration of Cr⁶⁺ was 20 mg•L^-1, illumination time was 2 h.