| 李越湘.污染物甲胺为电子给体可见光下Pt/ZnIn2S4光催化制氢[J].分子催化,2014,(5):466-473 |
| 污染物甲胺为电子给体可见光下Pt/ZnIn2S4光催化制氢 |
| Photocatalytic hydrogen evolution in the presence of pollutant methylamines |
| 投稿时间：2014-07-22 修订日期：2014-08-22 |
| DOI： |
| 中文关键词: 光催化 氢气 甲胺 ZnIn2S4 |
| 英文关键词:Photocatalysis Hydrogen evolution methylamines ZnIn2S4 |
| 基金项目: |
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| 中文摘要: |
| 用水热法制备了ZnIn2S4固溶体，并通过XRD和UV-vis漫反射光谱进行了表征。研究了一甲胺、二甲胺和三甲胺为给电子体，在Pt/ZnIn2S4 上的可见光光催化制氢及自身的降解反应。三种甲胺都能显著提高光催化分解水制氢活性，同时自身得到很好的降解。电子给体的放氢活性顺序为：TMA>> DMA > MMA。通过红外衰减全反射（ATR-IR）表征电子给体在ZnIn2S4表面的吸附行为，吸附强度大小依次为MMA>DMA > TMA。光催化活性与分子结构和在催化剂表面的吸附行为有关。三种污染物浓度对放氢活性的影响都符合Langmuir-Hinshelwood动力学模型。讨论了可能的化学反应机理。 |
| 英文摘要: |
| ZnIn2S4 photocatalyst was prepared by a hydrothermal method, and characterized by X-ray diffraction and UV-Vis absorption spectroscope techniques. Using monomethylamine (MMA), dimethylamine (DMA) and Trimethylamine (TMA) as electron donors, the photocatalytic hydrogen evolution and decomposition of the electron donors under visible light (λ>420 nm) irradiation over Pt/ZnIn2S4 have been investigated. The three methylamines improve notably photocatalytic hydrogen evolution with their simultaneous degradation, and their activity order for hydrogen evolution is TMA>> DMA > MMA. The adsorption of these donors on ZnIn2S4 was monitored by in situ attenuated total re?ection infrared spectroscopy (ATR-IR). The order of their adsorption intensity is MMA>DMA>TMA. The activity order depends on their molecular structure and adsorption performance. The effect of concentration of the pollutants on the hydrogen evolution rate is consistent with a Langmuir–Hinshelwood kinetic model. A possible reaction mechanism was discussed. |
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