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CaAl2O4:Eu2+,Nd3+-coupled g-C3N4 composites as novel light-free photocatalyst for organic methyl orange (MO) degradation

Abstract

In this work, we report a novel photocatalyst CaAl2O4:Eu2+,Nd3+ phosphor-coupled g-C3N4 quantum dots (QDs) that can continue the photocatalytic methyl orange (MO) degradation for > 3 h when there is no external light source. It is found that the photocatalytic activities of the CaAl2O4:Eu2+,Nd3+-coupled g-C3N4 QDs composites can come back its initial state after 30 cycles, meaning the recoverable photocatalytic behavior. On basis of the spectral behavior of CaAl2O4:Eu2+,Nd3+ and g-C3N4 QDs and the photocatalytic MO results of the g-C3N4 QDs, CaAl2O4:Eu2+,Nd3+ and CaAl2O4:Eu2+,Nd3+ coupled g-C3N4 QDs composites, we establish a mechanistic profile, and reveal the reason of this external light-free catalytic activity is attributed to the persistent luminescence of CaAl2O4:Eu2+,Nd3+ phosphor caused by the lattice defects, the light re-utilization and recombination rate of photo-generated carriers in CaAl2O4:Eu2+,Nd3+ coupled g-C3N4 QDs composite.

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Financial support from Funded by Southwest University of Science and Technology Natural Science Foundation (NO.18zx7125) is gratefully acknowledged.

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Correspondence to Jun Zhao, Zhiqin Zheng or Facheng Yi.

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Xiong, Y., Zhao, J., Zheng, Z. et al. CaAl2O4:Eu2+,Nd3+-coupled g-C3N4 composites as novel light-free photocatalyst for organic methyl orange (MO) degradation. J Mater Sci: Mater Electron 32, 7271–7284 (2021). https://doi.org/10.1007/s10854-021-05437-0

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