Enhanced Photocatalytic VOCs Mineralization via Special Ga-O-H Charge Transfer Channel in α-Ga2O3/MgAl-LDH Heterojunction

  • Peng Chen
    Peng Chen
    The Center of New Energy Materials and Technology, School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
    Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
    More by Peng Chen
  • Lvcun Chen
    Lvcun Chen
    The Center of New Energy Materials and Technology, School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
    Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
    More by Lvcun Chen
  • Xing’an Dong
    Xing’an Dong
    Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
  • Hong Wang
    Hong Wang
    Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
    More by Hong Wang
  • Jieyuan Li
    Jieyuan Li
    Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
    More by Jieyuan Li
  • Ying Zhou
    Ying Zhou
    The Center of New Energy Materials and Technology, School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
    More by Ying Zhou
  • Chao Xue
    Chao Xue
    State Centre for International Cooperation on Designer Low-carbon and Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
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  • Yuxin Zhang
    Yuxin Zhang
    College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
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  • , and 
  • Fan Dong*
    Fan Dong
    The Center of New Energy Materials and Technology, School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
    Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
    State Centre for International Cooperation on Designer Low-carbon and Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
    *Email: [email protected], [email protected]
    More by Fan Dong
Cite this: ACS EST Engg. 2021, 1, 3, 501–511
Publication Date (Web):December 29, 2020
https://doi.org/10.1021/acsestengg.0c00194
Copyright © 2020 American Chemical Society
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Abstract

This work demonstrated a strategy of electronic structure regulation of photocatalysts to improve the charge separation and migration efficiency for optimized photocatalytic VOCs mineralization performance. A novel heterojunction of an α-Ga2O3/MgAl-LDH hexagonal system was synthesized and applied for stable photocatalytic toluene degradation. On the basis of DFT calculations and experiment results, the lattice mismatch between α-Ga2O3 and MgAl-LDH was relatively small and a charge transfer of the Ga-O-H channel was created at the interface. The channel would induce the photogenerated electrons in α-Ga2O3 and quickly transfer into MgAl-LDH, thus facilitating the charge carriers transfer and enhancing the activation of oxygen/water molecules through the electronic interaction between the catalyst surface and the adsorbent. Then, highly separated electrons and holes will, respectively, react with activated oxygen and water molecules to generate abundant reactive oxygen species. Therefore, the α-Ga2O3/MgAl-LDH hexagonal system heterojunction could achieve an excellent activity and stability of photocatalytic toluene degradation (90.71%) and mineralization (84.0%) in different relative humility, far exceeding that of P25. The atomic interfacial understanding of the heterojunction’s structure will provide a new perspective on the development of efficient photocatalysts for environmental remediation or energy conversion.

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  • Schematic diagram for design and preparation of α-Ga2O3/MgAl-LDH, reaction device for activity test, schematic diagram of in situ DRIFTS measurement and spectrum range diagram of mercury lamp, comparison of the lattice parameters of the two crystal primitive cells (PDF)

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Cited By


This article is cited by 5 publications.

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  2. Zhenmin Xu, Wei Chai, Jiazhen Cao, Fengjiao Huang, Tong Tong, Suyuan Dong, Qianyu Qiao, Liyi Shi, Hexing Li, Xufang Qian, Zhenfeng Bian. Controlling the Gas–Water Interface to Enhance Photocatalytic Degradation of Volatile Organic Compounds. ACS ES&T Engineering 2021, 1 (7) , 1140-1148. https://doi.org/10.1021/acsestengg.1c00120
  3. Linxuan Xie, Ting Du, Jing Wang, Yiyue Ma, Yongsheng Ni, Zhaoli Liu, Liang Zhang, Chengyuan Yang, Jianlong Wang. Recent advances on heterojunction-based photocatalysts for the degradation of persistent organic pollutants. Chemical Engineering Journal 2021, 426 , 130617. https://doi.org/10.1016/j.cej.2021.130617
  4. Wenjun Ma, Xing'an Dong, Yun Wang, Wenjie He, Wendong Zhang, Yi Liang, Yi Wang, Wensheng Fu, Jiazhen Liao, Fan Dong. Highly enhanced photocatalytic toluene degradation and in situ FT-IR investigation on designed Sn-doped BiOCl nanosheets. Applied Surface Science 2021, 3 , 152002. https://doi.org/10.1016/j.apsusc.2021.152002
  5. Phuoc Loc Truong, Alemayehu Kidanemariam, Juhyun Park. A critical innovation of photocatalytic degradation for toxic chemicals and pathogens in air. Journal of Industrial and Engineering Chemistry 2021, 100 , 19-39. https://doi.org/10.1016/j.jiec.2021.05.012