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2D/3D interface engineering: direct Z-scheme g-C3N4/YMnO3 heterojunction for reinforced visible-light photocatalytic oxidation

  • Yizhang Wu
  • Xuan Zhou
  • Mengmeng Li
  • Yuanqi Wang
  • Boye Zhou
  • Niandu Wu
  • Wei Zhong
  • Hong-Ling CaiEmail author
  • X. S. WuEmail author
Article
  • 21 Downloads

Abstract

Graphitic carbon nitride (g-C3N4) is a two-dimensional (2D) photocatalyst, but it appears a mediocre catalytic property due to the recombination of charge carriers. Constructing heterojunctions can boost the separation and suppress the recombination of photo-generated electron–hole pairs. For the conventional Type-II heterojunction, the oxidation ability is significantly reduced due to the decreasing of band gap. We try to maintain its oxidation capacity and promote the artificial bandgap by tailoring a Z-scheme heterojunction through interface engineering. Herein, we grafted different proportions of YMnO3 3D-nanoparticles onto g-C3N4 2D-nanosheets. This special 2D/3D mixed-dimensional nanocomposite exhibits efficient charge carrier transport performance according to the electrochemistry and photocurrent measurement. The outstanding photocatalytic oxidation ability can be verified by the rate of Rhodamine B degradation, which is 3.8 and 2.3 times of YMnO3 and g-C3N4, respectively. Theoretical calculation, active group capture experiments and electron spin resonance indicate the energy band position and the reactive groups (superoxide radicals and holes). The optimized g-C3N4/YMnO3 heterojunction utilizes the interfacial synergistic effect to achieve a composition of vigorous oxidizing ability and outstanding visible light harvesting. This work will pave a promising access for mechanism and interface engineering of other g-C3N4-based Z-scheme heterojunctions.

Notes

Acknowledgement

This work was supported by the National Natural Science Foundations of China (No. 11574138, 11874200 and 21427801), the Top-Notch Young Talents Program of China, the National Key R&D Program of China (2016YFA0201104) and Dengfeng Project B of Nanjing University. Thanks are due to Mr. Wang for assistance with writing and to Mr. Xu for valuable discussion.

Supplementary material

10854_2019_2109_MOESM1_ESM.docx (100 kb)
Supplementary material 1 (DOCX 99 kb)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, School of PhysicsNanjing UniversityNanjingPeople’s Republic of China

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