RESEARCH ARTICLE

ZnFe2O4 deposited on BiOCl with exposed (001) and (010) facets for photocatalytic reduction of CO2 in cyclohexanol

  • Guixian Song 1,2 ,
  • Xionggang Wu 3 ,
  • Feng Xin , 1 ,
  • Xiaohong Yin , 4
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  • 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • 2. School of chemical engineering and textile, Shaanxi Polytechnic Institue, Xianyang 712000, China
  • 3. Xi’an Modern Chemistry Research Institute, Xi’an 710065, China
  • 4. School of Chemistry and Chemical Engineering, Tianjin University of Technology,Tianjin 300384, China

Received date: 08 May 2016

Accepted date: 02 Sep 2016

Published date: 12 May 2017

Copyright

2017 Higher Education Press and Springer-Verlag Berlin Heidelberg

Abstract

ZnFe2O4-BiOCl composites were prepared by both hydrothermal and direct precipitation processes and the structures and properties of the samples were characterized by various instrumental techniques. The samples were then used as catalysts for the photocatalytic reduction of CO2 in cyclohexanol under ultraviolet irradiation to give cyclohexanone (CH) and cyclohexyl formate (CF). The photocatalytic CO2 reduction activities over the hydrothermally prepared ZnFe2O4-BiOCl composites were higher than those over the directly-precipitated composites. This is because compared to the direct-precipitation sample, the ZnFe2O4 nanoparticles in the hydrothermal sample were smaller and more uniformly distributed on the surface of BiOCl and so more heterojunctions were formed. Higher CF and CH yields were obtained for the pure BiOCl and BiOCl composite samples with more exposed (001) facets than for the samples with more exposed (010) facets. This is due to the higher density of oxygen atoms in the exposed (001) facets, which creates more oxygen vacancies, and thereby improves the separation efficiency of the electron-hole pairs. More importantly, irradiation of the (001) facets with ultraviolet light produces photo-generated electrons which is helpful for the reduction of CO2 to ·CO2. The mechanism for the photocatalytic reduction of CO2 in cyclohexanol over ZnFe2O4-BiOCl composites with exposed (001) facets involves electron transfer and carbon radical formation.

Cite this article

Guixian Song , Xionggang Wu , Feng Xin , Xiaohong Yin . ZnFe2O4 deposited on BiOCl with exposed (001) and (010) facets for photocatalytic reduction of CO2 in cyclohexanol[J]. Frontiers of Chemical Science and Engineering, 2017 , 11(2) : 197 -204 . DOI: 10.1007/s11705-016-1606-y

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 21176192).
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