| In this thesis, using organic amine pollutants from water as electron donors, the photocatalytic hydrogen evolution and decomposition of the pollutants over Pt/ZnIn2S4have been investigated. The research work is composed of three parts.In the first part, using ethanolamine (EA), diethanolamine (di-EA) and triethanolamine (tri-EA) as electron donors, the photocatalytic hydrogen evolution and decomposition of the electron donors (pollutants) over Pt/ZnIn2S4have been investigated. The Pt was deposited on ZnIn2S4by in situ photoreduction. The three ethanolamines improve notably photocatalytic hydrogen generation with simultaneous degradation of the pollutants, and their activity order for hydrogen evolution is tri-EA>> di-EA> EA. The adsorption of these donors on ZnIn2S4was monitored by in situ attenuated total reflection infrared spectroscopy (ATRIR).The order of their adsorption intensity is EA> di-EA>> tri-EA. The activity order depends on their molecular structure and adsorption performance. The effect of concentration of the pollutants on the hydrogen generation rate is consistent with a Langmuir-Hinshelwood kinetic model. The weak basic condition is favorable for the photocatalytic hydrogen generation. A possible reaction mechanism was discussed.Secondly, we used UV-VIS, PL, H-NMR to detect the product. The possible mechanism was discussed.Finally, we used triethylamine as electron donor to study the photocatalytic hydrogen evolution and decomposition of the pollutants over Pt/ZnIn2S4. Triethylamine could enhance notably photocatalytic hydrogen generation activity. The adsorption model of TEA on ZnIn2S4was similar to tri-EA. Its natural pH value is optimal for the hydrogen evolution. The effect of concentration of TEA on the hydrogen generation rate is also consistent with a Langmuir-Hinshelwood kinetic model. |
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