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Construction of Rod-Shaped Manganese Trioxide/Phosphorus Doped Carbon Nitride Heterojunction for Z-Scheme Photodegrading Organic Pollutants

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Abstract

Photocatalysis is regarded as a promising environmental remediation technologies, and manganese oxide is expected to be one of the most efficient photocatalysts. Herein, a rod-shaped manganese trioxide/phosphorus doped carbon nitride Z-scheme heterojunction photocatalyst (Mn2O3/PCN) was prepared. Using rod-shaped phosphorus doped carbon nitride (PCN) as substrate, Mn2O3 particles grew on the surface. This not only inhibited the accumulation of Mn2O3 but also prevented the surface layer shedding of PCN. According to the experimental results, the energy band gap of PCN and Mn2O3 are 2.923 eV and 1.883 eV, respectively. The photocatalytic performance of Mn2O3/PCN enhanced significantly by constructing heterojunction. The optimum sample 0.50%Mn2O3/PCN was obtained by using the optimum ratio of precursors. The removal rates of Rhodamine B, Tetracycline Hydrochloride, Bisphenol A and Sulfamethoxazole with 0.50%Mn2O3/PCN were 99%, 99%, 59% and 71%, and the removal rates of total organic carbon were 72%, 66%, 39% and 49%, respectively. It was proved that ·O2− and ·OH were the main active species for Mn2O3/PCN to degrade pollutants via free radical trapping experiment and electron spin resonance. The migration direction of photogenerated electrons and heterojunction type were deduced by calculating work function (Φ) of Mn2O3(Φ = 7.91 eV) and PCN(Φ = 4.38 eV), and photocatalytic mechanism was proposed. This study has research significance for the application of manganese oxide based heterojunction photocatalyst in the field of environmental remediation.

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Acknowledgements

This work was supported by the Guangxi Natural Science Foundation project (NO. 2021GXNSFAA220003).

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  1. School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, People’s Republic of China

    Xiyuan Dong, Dongbo Wang & Ye Lei

  2. Guangxi Yufeng Group Company Limited, Liuzhou City, 545008, People’s Republic of China

    Yi Yang & Ji Liu

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XD: Methodology, Data curation, Writing—original draft, Formal analysis. DW: Conceptualization, Supervision, Project administration. YL: Methodology, Writing—review & editing. YY: Supervision, Project administration. JL: Supervision, Project administration.

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Dong, X., Wang, D., Lei, Y. et al. Construction of Rod-Shaped Manganese Trioxide/Phosphorus Doped Carbon Nitride Heterojunction for Z-Scheme Photodegrading Organic Pollutants. J Inorg Organomet Polym 33, 2890–2905 (2023). https://doi.org/10.1007/s10904-023-02736-3

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