Study On CuO/TiO₂ Photocatalytic Dye Wastewater Treatment

In recent decades,TiO₂ its non-toxic,high activity,good stability,oxidation,and other characteristics,making TiO₂ photocatalytic oxidation of refractory industrial wastewater possible.However,TiO₂ UV excited to a certain degree of restriction on its application.Large number of studies shows that the modified TiO₂ can stimulate expansion of the light response,and will be CuO TiO₂ a composite,excitation wavelength visible light can be moved to the red zone.Papers to methylene blue dye (MB) simulated high-color organic wastewater to study and explore CuO/TiO₂ visible dyes catalytic wastewater treatment feasibility.Research papers,including CuO/TiO₂ photocatalyst Preparation and Characterization,CuO/TiO₂ UV catalytic conversion of methylene blue and decoloration factors,CuO/TiO₂ visible catalytic conversion of methylene blue and decoloration factors,papers further To explore the natural light conditions CuO/TiO₂ photocatalytic dye wastewater treatment actual results.The results show that:Prepared by the hydrolysis using photocatalytic TiO₂,load CuO give CuO/TiO₂ photocatalyst.The catalyst BET surface area,XRD and ultraviolet-visible diffuse reflectance characterization,TiO₂ by the BET surface area of 181.3 m²/g,CuO/TiO₂ the BET surface area of 184.9 m²/g,TiO₂ catalysts,the average size of 19.83 nm,are anatase.CuO/TiO₂ catalyst for the average size of 25.82 nm.UV diffuse CuO/TiO₂ catalyst characterization that the absorption edge is moved to a red 890 nm,said CuO/TiO₂ catalyst can be visible excited.On the conditions under ultraviolet light,study found that photocatalytic reaction in this CuO/TiO₂ system can be accelerated by adding certain volume of H₂O₂.pH, photocatalysts dosage and initial chroma of this system affected photocatalytic efficiency obviously.Decolorization of 1000mL methylene blue of 500 times chroma reached 90%after 2h irradiation under a ZY3-150 high pressure Hg lamp with 0.1gCuO/TiO2 photocatalysts and 10mL30%H202 in pH=7 condition.Application for the expansion of light on the CuO/TiO₂ catalyst in visible light of the declining terms of methylene blue various factors.Decolorization rate reaches the best when H₂O₂ is 10mL per 1000mL methylene blue and photocatalysts dosage is 0.1 g. TiO₂ photocatalysts also can decolorize methylene blue under alkaline condition,but Decolorization rate reaches the best when H₂O₂ is 12.5mL and photocatalysts dosage is 0.1g.Contrast experiment under optimum condition shows that decolorization rate using CuO/TiO₂ photocatalysts reaches 88%within 2h,which is roach better than TiO₂ and Degussa P25.Research in natural light(sunlight) conditions,CuO/TiO₂ photocatalyst dye wastewater treatment simulation and the actual dye wastewater,provide for further practical application of the conditions.In the sunlight conditions,TiO₂ catalysts and their load after the CuO/TiO₂ catalyst for two hours after the methylene blue Decolorization rate can reach 88%and 91%.And at noon in the sunny Decolorization effect is the best,followed by sunny evening,the worst for the cloudy day.Actual use of sunlight dyeing wastewater treatment,CuO/TiO₂ catalyst,in the pH=3,the degradation rate was 17.07%,COD removal rate for 36.53%.