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Enhanced photocatalytic degradation of cationic and anionic dyes by Ag-modified g-C3N4 composite: Insights on different mechanisms under visible light

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Abstract

Ag/g-C3N4 was synthesized by thermopolymerization and photo-deposition methods, and the performance of Ag/g-C3N4 was evaluated by degrading cationic dye methylene blue (MB) and anionic dye tartrazine (TZ) under visible light. Results showed that the photocatalytic efficiency of Ag/g-C3N4 for MB and TZ was significantly improved compared with pristine g-C3N4. 80% of MB was removed in 120 min and TZ could be completely degraded in 90 min by Ag/g-C3N4. The improvement of photocatalytic efficiency can be ascribed to the better light absorption and lower recombination rate of e−/h+ after loading of Ag nanoparticles. The degradation efficiency of Ag/g-C3N4 for MB was improved as pH increased, while the efficiency for TZ was decreased at the same condition. This study also revealed the different photocatalytic mechanisms of MB and TZ. It showed that hole played a dominant role in degrading MB, while the degradation of TZ mainly relied on superoxide radical.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51878357) and the Natural Science Foundation of Tianjin (Grant No. 18JCYBJC23200).

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Authors and Affiliations

  1. College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China

    Kangxin Wen, Lianxue Wei, Zequn Ren, Bin Wang & Jinfeng Lu

  2. Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, Tianjin, 300071, China

    Jinfeng Lu

  3. Key Laboratory of Pollution Processes and Environmental Criteria (Nankai University), Ministry of Education, Tianjin, 300071, China

    Jinfeng Lu

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by WK, RZ, and WB. The first draft of the manuscript was written by WK, WL, and LJ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Wen, K., Wei, L., Ren, Z. et al. Enhanced photocatalytic degradation of cationic and anionic dyes by Ag-modified g-C3N4 composite: Insights on different mechanisms under visible light. Journal of Materials Research 36, 1549–1560 (2021). https://doi.org/10.1557/s43578-021-00203-8

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