Study On The Modifying Of Multiphase Photocatalyst And Photocatalytic Degradation Of Methyl Orange

With the speedy development of dyestuff industry, printing dye wastewater has already become one of important pollution source of water environment. The heterogeneous photocatalysis technology is that the environmental pollution being on the rise in recent years, the organic pollutants and the deoxidation inorganic pollution can be dislodged more thorough, it is that one kind of future environmental pollution depth purifies technology, has the fairly good marketplace prospect and social benefits in printing dye wastewater treatment.In this thesis,used different method to modify TiO₂ photocatalyst ,including compound the semiconductor, adulteration metal ion , the solid surface superacid.,choose the slanting ultraviolet high-handed mercury lamp as the illuminant, take typical azo dyestuff matter -methyl orange as target pollution,studied the photocatalytic degradate capability of modifaction TiO₂ in suspension, the influence to TiO₂ degradation capability in different preparation condition and modify method, and the degradation capability of TiO₂ photocatalyst under different reaction condition, acquire the best combination of reactional condition in the process of TiO₂ photocatalyst degradate methyl orange.TiO₂/ZnO coupled semiconductors have been prepared by damp mechanical-mixed method,and adulterated different ions into them. The test indicates that the best proportion of TiO₂/ZnO coupled semiconductor is 60%-80%, Ag⁺,Zr⁴⁺,Sn⁴⁺doping can obviously improve the photocatalytic activity, and the temperature to calcine have different influence to the photocatalytic activity of different metal ions-doped coupled semiconductor.TiO₂ and the TiO₂ photocatalyst doping the metal ion has been prepared by sol-gel, discussed the influence of preparation condition and doping metal ion to TiO₂ photocatalyst activity , getting the best technological conditions of photocatalyst preparation. Result indicate that: the capability of photocatalyst doping Zr⁴⁺ ion unceasingly improve with doping amount's enhancing and baking temperature's elevating; the capability of photocatalyst doping Ag⁺ and Ru³⁺ ion unceasingly declined with doping amount's enhancing, the capability of photocatalyst doping Ag⁺ ion had no change nearly in different baking temperature; the capability of photocatalyst doping Fe³⁺ and Sn⁴⁺ ion was optimization when the doping amount is 1.5×10^-4 mol and 2.0×10^-4mol, the capability of photocatalyst doping Fe³⁺ ion improved with baking temperature's elevating; the capability of photocatalyst doping Sn⁴⁺ , Ru³⁺ ion and no-doping was optimization when the baking temperature is 450℃; the capability of photocatalyst doping Co⁺ ion had no change nearly in different doping amount,and declined with baking temperature's elevating.The TiO₂ photocatalyst which been preparated by sol-gel is disposed with surface superacidation, the photocatalyst activity is good which the steep thickness of H₂SO₄ when for 1.0 mol/L , steeps time in H₂SO₄ when for 24h.The capability of surface superacid photocatalyst which doped Ag⁺and Ru³⁺ is optimization when the baking temperature is 450℃, and the capability of surface superacid which doped Zr⁴⁺, Sn⁴⁺, Fe³⁺ is optimization when the baking temperature is 550℃.We choose the photocatalyst which capability is of every series activity respectively to carry out the orthogonality experiment and optimize reaction condition.The result showed that: photocatalyst's degradation rates is direct proportion's with illumination intensity and reaction time;the photo-catalysis degradation capability under acidity or the slanting neuter environment is more than that under slanting basicity environment; The capability is optimizing when the photocatalyst dosage is at 0.6-0.8g/L;the capability of photocatalyst which doped Ru³⁺ and the surface superacid photocatalyst which doped Ag⁺ and Sn⁴⁺ reduced to some extent when methyl orange liquor initial thickness is comparatively high.