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Nitrogen self-doped layered porous Myriophyllum aquaticum biomass–derived biochar activated persulfate to efficiently degrade printing and dyeing wastewater

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Abstract

Biochar doped with heteroatom-like nitrogen could significantly improve its performance in several environmental applications. However, the preparation requires an additional nitrogen source, which influences its cost-effectiveness and impedes the practical applications. In the present study, the nitrogen self-doped biochar was prepared by using Foxtail algae (Myriophyllum aquaticum), which is a typical N-rich wetland plant as the raw material, without any modifications. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray electron spectroscopy (XPS) were used to characterize the morphology and crystal structure of the material. The biochar prepared at 800 °C (MBC800) was found to have a better porous structure, large specific area (1069.08 m2g−1), and more elemental N (3.11%). Furthermore, the MBC800 was used in the persulfate-activated degradation of Acid Orange 7 (AO7; 400 mgL−1), and about 97.42% of the removal rate was observed within 60 min when the MBC800 and PS dosages (MBC800/PS) were at 0.25 gL−1 and 4 gL−1 respectively. The radical trapping results indicated that amongst the free radicals (–OH•, SO4•–, O2•–) and non-radicals (1O2), the surface-bound hydroxyl radical (–OH•) of biochar played an important role, and the non-radical singlet oxygen (1O2) played a dominant role during the AO7degradation. The study namely provides a new way for the exploitation and utilization of Foxtail algae in preparing nitrogen-doped biochar for several environmental remediation applications.

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Funding

The authors received financial support provided by the National Natural Science Foundation of China under Grant No. 51,978,001; the Collaborative Innovation Project of Anhui Universities and Colleges (GXXT-2021-057); the Open Fund of Clean Catalysis Engineering Laboratory of Anhui Province (LCCE-04); and the School-level Scientific Research Project of Anhui University of Engineering (Xjky2022170).

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Conceptualization and original draft writing: Xiaofan Yang; conducted experiments and writing: Jiaxu Huo; formal analysis: Siyu Du; formal analysis, writing—review and editing: Saraschandra Naraginti; writing—review and editing: Meiqing Zhu; writing—review: Ran Hong; editing: Xiaoying Zhang; writing—review and editing: Xueyu Wei; writing—review and editing: Xiaoping Xu; editing: Guanghui Xie; editing: Xiang Sun; editing: Kuppusamy Sathishkumar.

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Correspondence to Xiaofan Yang.

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Yang, X., Siyu, D., Huo, J. et al. Nitrogen self-doped layered porous Myriophyllum aquaticum biomass–derived biochar activated persulfate to efficiently degrade printing and dyeing wastewater. Biomass Conv. Bioref. (2024). https://doi.org/10.1007/s13399-024-05719-7

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