Facile and Controllable Modification of 3D In2O3 Microflowers with In2S3 Nanoflakes for Efficient Photocatalytic Degradation of Gaseous ortho-Dichlorobenzene

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• 作者：Fei Zhang ; Xinyong Li ; Qidong Zhao ; Aicheng Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：September 1, 2016
• 年：2016
• 卷：120
• 期：34
• 页码：19113-19123
• 全文大小：794K
• 年卷期：0
• ISSN：1932-7455

文摘

Novel 3D In₂S₃/In₂O₃ heterostructures comprised of 3D In₂O₃ microflowers and In₂S₃ nanoflakes were synthesized via a facile hydrothermal process followed by an in situ anion exchange reaction. In the In₂S₃/In₂O₃ heterostructures, the In₂S₃ nanoflakes were in situ generated and uniformly assembled on In₂O₃ microflowers. The microstructures, optical properties, oxygen vacancy concentration, and photoreactivity of the heterostructures could be tuned by adjusting the amount of sulfide source. The effect of In₂S₃-nanoflakes modification on the oxygen vacancy concentration, optical properties, charge carrier separation, and charge carrier lifetime of In₂O₃ were investigated systematically. The catalytic activity of the proposed heterostructures for degradation of gaseous ortho-dichlorobenzene (o-DCB, a representative chlorinated volatile organic compounds) was higher than that of either unmodified In₂O₃ or TiO₂ (P25). Meanwhile, oxygen vacancies, systematically explored by Raman, X-ray photoelectron spectroscopy (XPS), and low-temperature electron spin resonance (ESR) spectroscopy, were demonstrated to have a two-side effect on the photocatalytic performance. Particularly, the main reaction products including o-benzoquinone type species, phenolate species, formates, acetates, and maleates were verified with in situ FTIR spectroscopy. Additionally, ESR examination confirmed that ^•OH and ^•O₂^– were the predominant reactive oxygen species involved in the degradation of gaseous o-DCB. The current research provides new insight into utilizing In-based heterostructures as promising and efficient visible-spectrum-responsive catalysts for the removal of harmful chlorinated volatile organic compounds.