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Citation: Cui-Rong XIONG, Wei-Ning LI, Hao HU, Qiong CAI, Yan KONG. Preparation of Au/CoWO4/g-C3N4 Z-Scheme Heterojunction Photocatalyst with Efficient Photodegradation Activity[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(11): 2222-2230. doi: 10.11862/CJIC.2022.228 shu

Preparation of Au/CoWO4/g-C3N4 Z-Scheme Heterojunction Photocatalyst with Efficient Photodegradation Activity

  • College of Chemical Engineering, Nanjing University of Technology, Nanjing 211816, China

  • Corresponding author: Yan KONG, kongy36@njtech.edu.cn
  • Received Date: 25 May 2022
    Revised Date: 8 September 2022

Figures(7)

  • The Z-scheme heterojunction photocatalyst Au/CoWO4/CNs (Au/CoNs-x, x=5, 10, 20, 50) was obtained by introducing Au into g-C3 N4 nanosheets (CNs) and CoWO4 composites via impregnation-calcination method. The introduction of Au could be a charge transport channel to accelerate the transfer of photogenerated electrons from CoWO 4 to CNs. Compared with CoWO 4/CNs, Au/CoNs-10 exhibited excellent photocatalytic activity for the degradation of methylene blue and tetracycline hydrochloride, and their apparent rate constants were improved from 0.289 and 0.360 h-1 to 0.499 and 0.637 h-1, respectively. Optical and electrical tests and free radical trapping experiments indicate that the significantly improved photocatalytic performance of Au/CoNs-10 is mainly due to the construction of Z-scheme heterojunction, which reduces the recombination rate of photogenerated electrons and holes, promotes high oxidation activity and accelerates the formation of hydroxyl radicals (·OH) and superoxide radicals (·O2-) with high oxidation ability.
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