期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep24918
关键词
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资金
- National Natural Science Foundation of China [20140654, 21376061]
- Program for New Century Excellent Talents in University [NCET-12-0686]
- Natural Science Foundation of Hebei Province [B2015208005, B2015208010]
- Scientific Research Foundation for High-Level Talent in University of Hebei Province [GCC2014057]
- Young Talents Program in University of Hebei Province [BJ2016022]
- Foundation of Hebei University of Science and Technology [2013YY17]
Surface defect of nanomaterials is an important physical parameter which significantly influences their physical and chemical performances. In this work, high concentration of surface oxygen vancancies (SOVs) are successfully introduced on {001} facets exposed BiOBr nanosheets via a simple surface modification using polybasic carboxylic acids. The chelation interaction between carboxylic acid anions and Bi3+ results in the weakness of Bi-O bond of BiOBr. Afterwards, under visible-light irradiation, the oxygen atoms would absorb the photo-energy and then be released from the surface of BiOBr, leaving SOVs. The electron spin resonance (ESR), high-resolution transmission electron microscopy (HRTEM), and UV-vis diffuse reflectance spectra (DRS) measurements confirm the existence of SOVs. The SOVs can enhance the absorption in visible light region and improve the separation efficiency of photo-generated charges. Hence, the transformation rate of adsorbed O-2 on the as-prepared BiOBr with SOVs to superoxide anion radicals (center dot O-2(-)) and the photocatalytic activity are greatly enhanced. Based on the modification by several carboxylic acids and the photocatalytic results, we propose that carboxylic acids with natural bond orbital (NBO) electrostatic charges absolute values greater than 0.830 are effective in modifying BiOBr.
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