醇类溶剂对二氧化钛理化性质及光催化性能的影响

S. Nikhil, G. Ranjith
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引用次数: 0

摘要

近年来在半导体光催化方面的研究表明,单/多纳米异质结复合材料具有较好的光催化性能。此外,据报道,酒精溶剂的使用对相的形成有重大影响,从而影响光催化性能。本文报道了采用溶胶-凝胶法制备不同醇溶剂的二氧化钛。使用结构、表面和光学表征技术对样品进行了分析。结构分析证实了样品的高结晶性质及其纳米级尺寸分布。乙醇和丙醇溶剂合成的二氧化钛样品表现为混合相,丁醇溶剂合成的二氧化钛样品表现为纯锐钛矿相,这与先前的报道一致,揭示了溶剂碳链长度对相变的作用。表面表征表明在所有情况下都形成了纳米团聚体。还对样品进行了光致发光分析,以确定样品中的陷阱水平。以亚甲基蓝为探测污染物,在紫外照射下测定了样品的光催化活性。与商用光催化剂德固赛P25相比,三种样品均表现出良好的光催化性能。用乙醇溶剂合成的二氧化钛样品与其他样品相比,具有更好的光催化活性。乙醇基二氧化钛样品具有优异的光催化性能,这可能是由于混合相二氧化钛在锐钛石-金红石纳米异质结处有效地分离了载流子,并且具有较高的比表面积。研究表明,溶胶凝胶合成溶剂的性质对二氧化钛的理化性能和光催化性能有重要影响。近年来在半导体光催化方面的研究表明,单/多纳米异质结复合材料具有较好的光催化性能。此外,据报道,酒精溶剂的使用对相的形成有重大影响,从而影响光催化性能。本文报道了采用溶胶-凝胶法制备不同醇溶剂的二氧化钛。使用结构、表面和光学表征技术对样品进行了分析。结构分析证实了样品的高结晶性质及其纳米级尺寸分布。乙醇和丙醇溶剂合成的二氧化钛样品表现为混合相,丁醇溶剂合成的二氧化钛样品表现为纯锐钛矿相,这与先前的报道一致,揭示了溶剂碳链长度对相变的作用。表面表征表明纳米aggl的形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Role of alcohol solvents on physico-chemical characteristics and photocatalytic performance of titania
The recent research on semiconductor photocatalysis reveals that the uni/multi nano heterojunction composites shows superior photocatalytic performance compared to the pristine one. Moreover, it has been reported that the use of alcoholic solvents has significant influence in the phase formation and thereby on the photocatalytic performance. The present work reports the synthesis of titania using sol gel technique employing different alcohol solvents. The samples were analysed using structural, surface and optical characterisation techniques. The structural analysis confirms the high crystalline nature of the samples along with its nanoscale size distribution. The titania samples synthesised with ethanol and propanol solvents exhibit mixed phase and the sample synthesized with butanol solvent showed pure anatase phase which agrees with the earlier reports revealing the role of length of the carbon chain of the solvent on phase transformation. The surface characterization reveals the formation of nano agglomerates in all the cases. Photoluminescence analyses of the samples were also carried out to identify the trap levels in the samples. The photocatalytic activities of the samples were performed under U-V irradiation with the probe pollutant methylene blue. All the three samples showed good photocatalytic performance compared to the commercial photocatalyst Degussa P25. The titania sample synthesized using ethanol solvent showed superior photocatalytic activity compared to other samples. The superior photocatalytic performance of the ethanol based titania sample maybe attributed to the efficient separation of the charge carrier at the anatase-rutile nano heterojunction of the mixed phase titania along with high surface area. This study reveals that the nature of the solvent for the sol gel synthesis have a substantial influence in the physico-chemical and photocatalytic performance of titania.The recent research on semiconductor photocatalysis reveals that the uni/multi nano heterojunction composites shows superior photocatalytic performance compared to the pristine one. Moreover, it has been reported that the use of alcoholic solvents has significant influence in the phase formation and thereby on the photocatalytic performance. The present work reports the synthesis of titania using sol gel technique employing different alcohol solvents. The samples were analysed using structural, surface and optical characterisation techniques. The structural analysis confirms the high crystalline nature of the samples along with its nanoscale size distribution. The titania samples synthesised with ethanol and propanol solvents exhibit mixed phase and the sample synthesized with butanol solvent showed pure anatase phase which agrees with the earlier reports revealing the role of length of the carbon chain of the solvent on phase transformation. The surface characterization reveals the formation of nano aggl...
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