Journal
CHEMOSPHERE
Volume 216, Issue -, Pages 733-741Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.10.181
Keywords
g-C3N4 nanosheets; BiFeO3; Cr(VI) photoreduction; Heterojunction; Electrolyte ion
Categories
Funding
- National Natural Science Foundation of China [51608208]
- Natural Science Foundation of Hunan Province [2018JJ3887, 2018JJ3096]
- China Postdoctoral Science Foundation [2017M610513]
- Research Foundation of Education Department of Hunan Province, China [17K105]
- Natural Science Foundation of Guangdong Province [2016A030310246, 2016A030310456]
- Science and Technology Planning Project of Hunan Province [2016TP2007, 2016TP1014]
- Scientific Research Staring Foundation for the attracted talent of Central South University of Forestry and Technology [2016YJ001]
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A novel ternary composite of graphitic carbon nitride (g-C3N4)/graphene oxide (GO) sheets/BiFeO3 (CNGB) with highly enhanced visible-light photocatalytic activity toward Cr(Vl) photoreduction is prepared and characterized. The characterization and photocatalysis experiments corroborate its reasonable band gap, efficient charge separation and transfer, widened visible-light adsorption, easy solid-liquid separation, good stability and superior catalytic activity of CNGB. Three CNGB samples with different ratios of g-C3N4 and BiFeO3 (CNGB-1, -2, -3 with 2:4, 3:3, and 4:2, respectively), though possessing different adsorption ability, eventually remove all Cr(Vl) ions via photocatalysis within 90 min. The catalytic efficiency of the composite is the highest at pH 2; increases in pH decrease the catalytic ability. The inorganic anions such as SO4-, Cl-, and NO3- only slightly affects the photocatalytic process. The matching of the band structure between BiFeO3 and g-C3N4 generates efficient photogenerated electron migration from the conduction band of g-C3N4 to that of BiFeO3, which is also facilitated by the electron bridging and collecting effects of GO, and holes transfer from the valence band of BiFeO3 to that of g-C3N4, yielding the efficient separation of photogenerated electron-hole pairs and the subsequent enhancement of photocatalytic activity. The research provides a theoretical basis and technical support for the development of photocatalytic technologies for effective application in wastewater treatment and Cr-contaminated water restoration. (C) 2018 Elsevier Ltd. All rights reserved.
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