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Facile synthesis of TaOxNy photocatalysts with enhanced visible photocatalytic activity

机译:简便地合成具有增强的可见光催化活性的TaOxNy光催化剂

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N-doped TaOxNy is prepared using ethylenediamine as the nitrogen source by a sol-gel method. The obtained samples are subsequently calcined at 500-900 degrees C. XRD analysis and XPS survey indicate the presence of immature TaO2 (Ta4+) in the N-doped TaOxNy sample sintered at 550 degrees C (TaOxNy-550), and the UV results show TaOxNy-550 has a rather strong absorption in the visible light region. The photocatalytic activities of TaOxNy are evaluated in hydrogen generation by water splitting and photodegradation of methyl orange. The N-doped TaOxNy sample sintered at 550 degrees C shows the highest H-2 generation rate of 3.12 mmol g(-1) h(-1), and only 3.1% methyl orange is left after 90 min irradiation. Such photocatalytic activities are comparable to the conventional nitrogen-doped titania.
机译:使用乙二胺作为氮源,通过溶胶-凝胶法制备N掺杂的TaOxNy。随后将获得的样品在500-900摄氏度下煅烧。XRD分析和XPS调查表明,在550摄氏度(TaOxNy-550)烧结的N掺杂TaOxNy样本中存在不成熟的TaO2(Ta4 +)。 TaOxNy-550在可见光区域具有相当强的吸收性。 TaOxNy的光催化活性通过水分解和甲基橙的光降解作用在制氢中进行评估。在550摄氏度下烧结的N掺杂TaOxNy样品显示出最高的H-2生成速率为3.12 mmol g(-1)h(-1),并且在90分钟的照射后仅剩下3.1%的甲基橙。这种光催化活性与常规的氮掺杂二氧化钛相当。

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