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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Mechanistic insight into the photocatalytic hydrogenation of 4-nitroaniline over band-gap-tunabie CdS photocatalysts
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Mechanistic insight into the photocatalytic hydrogenation of 4-nitroaniline over band-gap-tunabie CdS photocatalysts

机译：机械能见解带隙tunabie CdS光催化剂上的4-硝基苯胺的光催化加氢。

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摘要

CdS photocatalysts with tunable band gaps (2.17-2.32 eV) were successfully prepared by a solvothermal method. Photocataiytic hydrogenation of 4-nitroaniline over the obtained samples was evaluated in the presence of HCO2NH4 as a hole scavenger upon purging with N2 under visible light irradiation (λ ≥ 420 nm). The CdS sample prepared by CdCl2 and sulfur powder in ethylenediamine showed excellent catalytic activity, giving 100% of 4-nitroaniline conversion and 95% of p-phenylenediamine selectivity after 35 min of visible light irradiation. The results of electron spin resonance revealed that its photoexcited holes could efficiently react with HCO2~ ions within HCO2NH4 molecules to produce ~·CO2~- radicals with strong reductive abilities. Furthermore, photoexcited electrons of the obtained sample exhibited relatively strong reductive abilities as compared to other CdS samples. Therefore, this sample showed the highest catalytic activity among the CdS samples for the photocataiytic hydrogenation of 4-nitroaniline.
机译：通过溶剂热法成功制备了带隙可调（2.17-2.32 eV）的CdS光催化剂。在可见光照射下（λ≥420 nm）用N2吹扫后，在存在HCO2NH4作为空穴清除剂的情况下，评估了所获得样品上4-硝基苯胺的光催化氢化作用。由CdCl2和硫粉在乙二胺中制备的CdS样品表现出优异的催化活性，在可见光照射35分钟后，具有100％的4-硝基苯胺转化率和95％的对苯二胺选择性。电子自旋共振的结果表明，其光激发空穴可以与HCO2NH4分子中的HCO2〜离子有效反应，产生具有较强还原能力的〜·CO2〜-自由基。此外，与其他CdS样品相比，获得的样品的光激发电子表现出较强的还原能力。因此，该样品在CdS样品中对4-硝基苯胺的光催化氢化显示出最高的催化活性。

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