Studies On The Preparation Of Photocatalyst And Photocatalytic Production Of Hydrogen With Glycerol Degradation

In this thesis, using organic pollutants from waste water as electron donors, the photocatalytic hydrogen evolution and decomposition of the pollutants over Pt / TiO₂ have been investigated.The preparation and modification of indium visible-light responsive photocatalysts as well as its photocatalytic performance for hydrogen production was searched. The reseach work is composed of two parts:In part one, using glycerol as electron donor, the photocatalytic hydrogen generation over Pt/TiO₂ have been investigated. The results show that glycerol not only can improve the efficiency of photocatalytic hydrogen generation but also be decomposed effectively. The factors which affect photocatalytic hydrogen generation, such as irradiation time, initial concentrations of the glycerol solution, pH-value of the suspensions and the coexisting substances were studied. The final products of glycerol oxidation were H₂O and CO₂. Glyceraldehyde, glycoladehyde, glycolic acid, and formaldehyde were identified as the intermediate products. A possible reaction mechanism was discussed.In part two, visible-light responsive photocatalysts In (OH)_yS_z: Zn and In (OH)_yS_z: Zn : Ag was prepared by hydrothermal method using In₂(SO₄)₃, thiourea, ZnSO₄, AgNO₃ as a raw materials. The samples were characterized by X-ray diffracton and UV-Vis spectrophotometer. The photocatalytic activity was investigated through photocatalytic H₂ production under visible light irradiation as a probe reaction. It has been found that the visible light activities of In (OH)_yS_z:Zn:Ag samples have been greatly increased compared to In (OH)_yS_z:Zn. and the absorption edge shifts remarkably toward long wavelength compared with In (OH)_yS_z:Zn.