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

doi:10.1007/s11705-016-1606-y

Front. Chem. Sci. Eng.

2017, Vol. 11

Issue (2) : 197-204 https://doi.org/10.1007/s11705-016-1606-y

RESEARCH ARTICLE

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

Guixian Song^1,², Xionggang Wu³, Feng Xin¹(

), Xiaohong Yin⁴(

)

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

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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.

Keywords reduction of CO₂ cyclohexanol ZnFe₂O₄ deposited BiOCl facet composite photocatalyst

Corresponding Author(s): Feng Xin,Xiaohong Yin

Online First Date: 15 December 2016 Issue Date: 12 May 2017

Cite this article:

Guixian Song,Xionggang Wu,Feng Xin, et al. ZnFe₂O₄ deposited on BiOCl with exposed (001) and (010) facets for photocatalytic reduction of CO₂ in cyclohexanol[J]. Front. Chem. Sci. Eng., 2017, 11(2): 197-204.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-016-1606-y
https://academic.hep.com.cn/fcse/EN/Y2017/V11/I2/197

Fig.1 SEM images of the pure BiOCl samples: (a,b) BOC-001 sample with different magnification, (c,d) BOC-010 sample with different magnification

Fig.2 SEM images of the ZnFe₂O₄-BiOCl composite samples: (a) ZBH-001, (b) ZBH-010, (c) ZBP-001, and (d) ZBP-010

Fig.3 TEM images of the samples: (a) BOC-001, (b) BOC-010, (c) ZBH-001, (d) ZBP-001, (e) ZBH-010, and (f) ZBP-010. HRTEM images are shown in the insets

Fig.4 XRD patterns of the samples: (a) BOC-001, ZBP-001, and ZBH-001; (b) BOC-010, ZBP-010, and ZBH-010

Fig.5 UV-vis diffuse reflection spectra of the samples: (a) BOC-001, ZBP-001, and ZBH-001; (b) BOC-010, ZBP-010, and ZBH-010

Fig.6 Yields of (a) CF and (b) CH as a function of irradiation time over different photocatalyst samples for the photocatalytic reduction of CO₂ under UV irradiation

Fig.7 The recycling performance of ZBH-001 for the photocatalytic reduction of CO₂ after 8 h of UV irradiation

Fig.8 Proposed mechanism for the photocatalytic reduction of CO₂ in cyclohexanol over ZnFe₂O₄-BiOCl nanocomposite with exposed (001) facets

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