Journal
APPLIED SURFACE SCIENCE
Volume 358, Issue -, Pages 181-187Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2015.09.042
Keywords
alpha-Fe2O3; g-C3N4; Composite; Photocatalytic reduction; Cr(VI)
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Funding
- National Natural Science Foundation of China [21307035, 51572101]
- Fundamental Research Funds for Central Universities of China [2013PY112, 2662015PY047]
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alpha-Fe2O3/g-C3N4 composites were fabricated by a facile hydrothermal method. The prepared composites were characterized by XRD, XPS, TEM, DRS, PL and photoelectrochemical measurement. Under visible light irradiation, alpha-Fe2O3/g-C3N4 composite displays higher photocatalytic activity than pure g-C3N4 and alpha-Fe2O3 for Cr(VI) reduction. The enhanced photocatalytic activity should be attributed to the wellmatched band structure and intimate contact interfaces between g-C3N4 and alpha-Fe2O3, which lead to the effective transfer and separation of the photogenerated charge carriers. The decoration of alpha-Fe2O3 does not affect the morphology and size of g-C3N4. The lower photoluminescence intensity and higher photocurrent density indicate the effective transfer and separation of photogenerated charge carriers. alpha-Fe2O3/g-C3N4 composite shows more intense optical absorption compared with pure g-C3N4. The addition of hole scavengers can greatly facilitate the photocatalytic reduction of Cr(VI) and the alpha-Fe2O3/g-C3N4 composite shows excellent stability during the photocatalytic reduction of Cr(VI). (C) 2015 Elsevier B.V. All rights reserved.
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