Visible light-responsive carbon-decorated p-type semiconductor CaFe2O4 nanorod photocatalyst for efficient remediation of organic pollutants

doi:10.1016/S1872-2067(17)62888-2

Abstract

Abstract:

We report the fabrication and photocatalytic property of a composite of C/CaFe₂O₄ nanorods (NRs) in an effort to reveal the influence of carbon modification. It is demonstrated that the photocatalytic degradation activity is dependent on the mass ratio of C to CaFe₂O₄. The optimal carbon content is determined to be 58 wt% to yield a methylene blue (MB) degradation rate of 0.0058 min^-1, which is 4.8 times higher than that of the pristine CaFe₂O₄ NRs. The decoration of carbon on the surface of CaFe₂O₄ NRs improves its adsorption capacity of the MB dye, which is specifically adsorbed on the surface as a monolayer according to the adsorption isotherm analysis. The trapping experiments of the reactive species indicate that superoxide radicals (^·O₂^-) are the main active species responsible for the removal of MB under visible-light irradiation. Overall, the unique feature of carbon coating enables the efficient separation and transfer of photogenerated electrons and holes, strengthens the adsorption capacity of MB, and improves the light harvesting capability, hence enhancing the overall photocatalytic degradation of MB.

Key words: p-type semiconductor CaFe₂O₄, Carbon coating, Nanorod, Composite photocatalyst, Degradation of methylene blue

Xin Liu, Yuhong Zhang, Yushuai Jia, Junzhe Jiang, Yabin Wang, Xiangshu Chen, Tian Gui. Visible light-responsive carbon-decorated p-type semiconductor CaFe₂O₄ nanorod photocatalyst for efficient remediation of organic pollutants[J]. Chinese Journal of Catalysis, 2017, 38(10): 1770-1779.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62888-2

https://www.cjcatal.com/EN/Y2017/V38/I10/1770

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Visible light-responsive carbon-decorated p-type semiconductor CaFe₂O₄ nanorod photocatalyst for efficient remediation of organic pollutants

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