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Performance and mechanism of tea waste biochar in enhancing the removal of tetracycline by peroxodisulfate

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Abstract

In this work, tea waste biochar was prepared and used to activate peroxodisulfate (PDS) for the removal of tetracycline (TC) efficiently. And SEM, XRD, Raman, and FTIR were used to characterize the biochar. The effects of reaction conditions including initial pH, biochar dosage, and PDS concentration on the removal of TC were explored, and the result showed that compared with the biochar prepared at 400 °C and 500 °C, the biochar pyrolyzed at 600 °C (TBC600) had the highest TC removal performance due to its higher sp2 hybrid carbon content, richer defective structure, and stronger electron deliverability. Under the optimal dosage of PDS (4 mM) and TBC600 (0.8 g L−1), the removal efficiency of TC (10 mg L−1) reached 81.65%. After four cycles of TBC600, the removal rate could still reach 75.51%, indicating that TBC600 has excellent stability. In addition, quenching experiments and electron paramagnetic resonance (EPR) verified that the active oxygen including SO4·, ·OH, O2·, and singlet oxygen (1O2) was involved, among which 1O2 and OH were the main active substance in the TC removal. Therefore, this work provided a green and efficient persulfate activator and a method for recycling tea waste.

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Funding

This work was provided by the National Natural Science Foundation of China under grants (No.21477050), the International Scientific and Technological Cooperation in Changzhou (CZ20140017), Changzhou Sci&Tech Program (CJ20200077), Natural Science Research Project of Higher Education Institutions in Jiangsu Province (19KJB560008), and Postgraduate Research Innovation Project of Jiangsu Province (KYCX20_2598, KYCX20_2561).

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YZ: conceptualization, investigation, methodology, formal analysis, writing—original draft, and writing—review and editing. SJ: supervision, project administration, writing—review and editing, and funding acquisition. LQ: conceptualization and resources. KX: resources, data curation, and software. XK: resources, data curation, and software. LW: supervision, project administration, and funding acquisition.

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Correspondence to Shanqing Jiang or Liping Wang.

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The authors declare no competing interests.

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Responsible Editor: Zhihong Xu

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Zhang, Y., Jiang, S., Qiu, L. et al. Performance and mechanism of tea waste biochar in enhancing the removal of tetracycline by peroxodisulfate. Environ Sci Pollut Res 29, 27595–27605 (2022). https://doi.org/10.1007/s11356-021-18285-6

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  • DOI: https://doi.org/10.1007/s11356-021-18285-6

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