The Application Of Composite Photocatalyst TiO₂-Al₂O₃ For Light-contaminated Water

In this article, composite photocatalyst TiO₂-Al₂O₃ was made, then applying it to clarify light-contaminated water. Researches have showed that: composite photocatalyst TiO₂-Al₂O₃ has the potential to degrade pollutants by ultraviolet (UV) rays, meanwhile, this is a very safe and reliable way for light-contaminated water treatment. The ability of composite photocatalyst TiO₂-Al₂O₃ of degradation COD_cr in light-contaminated water can reach to 95.5%.In my experiments, Al(0H)3 gelatin was made by Sol-gel, Aluminium dioxide converted from Al(0H)3 at the temperature of 500℃ , under this calcination temperature, γ - Al₂O₃ formed.In the progress of making composite photocatalyst TiO₂-Al₂O₃ ,γ -Al₂O₃ was immerged into the mixed solution, which was mixed by Titanium n-butoxide (TBOT) and pure alcohol. Effects of the mixed solution concentration ,calcination temperature of immerged material,activation time,UV-vis lighting time were investigated, in order to make a high performance composite photocatalyst Ti_O2-Al₂O₃.Meanwhile, Ag-based activated-Carbon (Ag-AC) was made for later sequencing water treatment procedure, after the former water treatment progress of applying composite photocatalyst TiO₂-Al₂O₃ by photocatalysis. Ag-based activated-Carbon (Ag-AC) has the potential to disinfect microorganisms and able to remove organic contaminants.Regenerating composite photocatalyst TiO₂-Al₂O₃ which reached its limitation of photocatalysis, and after that put it back into the application of water treatment.The γ -Al₂O₃ and TiO₂(which has already based on the surface of 7 - Al₂O₃ ) were characterized by X-ray diffraction (XRD),Sanning electron microscopy (SEM), Surface area testing. Results shows that : Al₂O₃ is mainly the type of 7 - Al₂O₃, its surface area is about: 226m²/g. TiO₂ mainly exits on the surface of γ -Al₂O₃ with the...