Citation: Jing Xu, Jin Huang, Zhouping Wang, Yongfa Zhu. Enhanced visible-light photocatalytic degradation and disinfection performance of oxidized nanoporous g-C₃N₄ via decoration with graphene oxide quantum dots[J]. Chinese Journal of Catalysis, ;2020, 41(3): 474-484. doi: S1872-2067(19)63501-1 shu

Enhanced visible-light photocatalytic degradation and disinfection performance of oxidized nanoporous g-C₃N₄ via decoration with graphene oxide quantum dots

Jing Xu ^a,b,c,d, ,
Jin Huang ^a,b,c,d ,
Zhouping Wang ^a,b,c,d ,
Yongfa Zhu ^e

a State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China;
b School of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China;
c International Joint Laboratory on Food Safety, Jiangnan University, Wuxi 214122, Jiangsu, China;
d Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi 214122, Jiangsu, China;
e Department of Chemistry, Tsinghua University, Beijing 100084, China

Received Date: 25 July 2019
Revised Date: 4 September 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21707052), Jiangsu Agriculture Science and Technology Innovation Fund (CX(18)2025), Fundamental Research Funds for the Central Universities (JUSRP11905 and JUSRP51714B), and Key Research and Development Program of Jiangsu Province (BE2017623).

Oxidized nanoporous g-C₃N₄ (PCNO) decorated with graphene oxide quantum dots (ox-GQDs) was successfully prepared by a facile self-assembly method. As co-catalysts, the ultrasmall zero-dimensional (0D) ox-GQDs can achieve uniform dispersion on the surface/inner channels of PCNO, as well as intimate contact with PCNO through hydrogen bonding, π-π, and chemical bonding interactions. In contrast with PCNO, the ox-GQDs/PCNO composite photocatalysts possessed improved light-harvesting ability, higher charge-transfer efficiency, enhanced photooxidation capacity, and increased amounts of reactive species due to the upconversion properties, strong electron capturing ability, and peroxidase-like activity of the ox-GQDs. Therefore, the visible-light photocatalytic degradation and disinfection performances of the ox-GQDs/PCNO composite were significantly enhanced. Remarkably, the composite with a 0.2 wt.% deposited amount of ox-GQDs (ox-GQDs-0.2%/PCNO) exhibited optimum amaranth photodegradation activity, with a corresponding rate about 3.1 times as high as that of PCNO. In addition, ox-GQDs-0.2%/PCNO could inactivate about 99.6% of Escherichia coli (E. coli) cells after 4 h of visible light irradiation, whereas only~31.9% of E. coli cells were killed by PCNO. Furthermore, h⁺,·O₂^-, and·OH were determined to be the reactive species generated in the photocatalytic process of the ox-GQDs/PCNO system; these species can thoroughly mineralize azo dyes and effectively inactivate pathogenic bacteria.
- Photocatalysis,
- Oxidized nanoporous g-C₃N₄,
- Graphene oxide quantum dots,
- Degradation,
- Disinfection
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Enhanced visible-light photocatalytic degradation and disinfection performance of oxidized nanoporous g-C3N4 via decoration with graphene oxide quantum dots

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Enhanced visible-light photocatalytic degradation and disinfection performance of oxidized nanoporous g-C₃N₄ via decoration with graphene oxide quantum dots