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Nitrogen doping and carbon coating affects substrate selectivity of TiO2 photocatalytic organic pollutant degradation.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-09-23 , DOI: 10.1002/cphc.202000492 Yishu Zhang 1 , Caroline Kirk 1 , Neil Robertson 1
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-09-23 , DOI: 10.1002/cphc.202000492 Yishu Zhang 1 , Caroline Kirk 1 , Neil Robertson 1
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A series of carbon‐coated, nitrogen‐doped titanium dioxide photocatalysts was produced and characterized. N‐doped TiO2 powder samples were prepared using a sol‐gel method and subsequently used for making doped‐TiO2 thin films on glass substrates. Carbon layers were coated on the films by a thermal decomposition method using catechol. Diffuse reflectance spectra and Mott‐Schottky analyses of the samples proved that nitrogen doping and carbon coating can slightly lower the band gap of TiO2, broaden its absorption to visible light and enhance its n‐type character. According to photocatalytic tests against model contaminants, carbon‐coated nitrogen‐doped TiO2 films have better performance than simple TiO2 on the degradation of Rhodamine B dye molecules, but are poorly effective for degrading 4‐chlorophenol molecules. Several possible explanations are proposed for this result, supported by scavenging experiments. This reveals the importance of a broad substrate scope when assessing new photocatalytic materials for water treatment, something which is often overlooked in many literature studies.
中文翻译：
氮掺杂和碳涂层会影响TiO2光催化有机污染物降解的基质选择性。
产生并表征了一系列碳涂层，氮掺杂的二氧化钛光催化剂。使用溶胶凝胶法制备N掺杂的TiO 2粉末样品，然后用于在玻璃基板上制备掺杂的TiO 2薄膜。通过使用邻苯二酚的热分解法将碳层涂覆在膜上。样品的漫反射光谱和Mott-Schottky分析证明，氮掺杂和碳涂层可以稍微降低TiO 2的带隙，扩大其对可见光的吸收并增强其n型特性。根据针对模型污染物的光催化测试，碳涂覆的氮掺杂TiO 2薄膜具有比简单的TiO 2更好的性能。对若丹明B染料分子的降解，但对降解4-氯苯酚分子效果不佳。在清除实验的支持下，对此结果提出了几种可能的解释。这揭示了在评估用于水处理的新型光催化材料时，广泛的基材范围的重要性，这在许多文献研究中常常被忽略。
更新日期：2020-11-18
中文翻译：
氮掺杂和碳涂层会影响TiO2光催化有机污染物降解的基质选择性。
产生并表征了一系列碳涂层，氮掺杂的二氧化钛光催化剂。使用溶胶凝胶法制备N掺杂的TiO 2粉末样品，然后用于在玻璃基板上制备掺杂的TiO 2薄膜。通过使用邻苯二酚的热分解法将碳层涂覆在膜上。样品的漫反射光谱和Mott-Schottky分析证明，氮掺杂和碳涂层可以稍微降低TiO 2的带隙，扩大其对可见光的吸收并增强其n型特性。根据针对模型污染物的光催化测试，碳涂覆的氮掺杂TiO 2薄膜具有比简单的TiO 2更好的性能。对若丹明B染料分子的降解，但对降解4-氯苯酚分子效果不佳。在清除实验的支持下，对此结果提出了几种可能的解释。这揭示了在评估用于水处理的新型光催化材料时，广泛的基材范围的重要性，这在许多文献研究中常常被忽略。
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