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论文类型：期刊论文

发表时间：2016-09-01

发表刊物：JOURNAL OF PHYSICAL CHEMISTRY C

收录刊物：SCIE、EI、Scopus

卷号：120

期号：34

页面范围：19113-19123

ISSN号：1932-7447

摘要：Novel 3D In2S3/In2O3 heterostructutes comprised of 8D In2O3 mictoflowers 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)-O-center dot and O-center dot(2)- 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.