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Removal of tetracycline in aqueous solution by iron-loaded biochar derived from polymeric ferric sulfate and bagasse

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Abstract

In this study, the tetracycline (TC) removal performance of iron-loaded biochar (BPFSB) derived from sugarcane bagasse and polymerized iron sulfate was investigated, and the mechanism of TC removal was also explored by study of isotherms, kinetics and thermodynamics and characterization of fresh and used BPFSB (XRD, FTIR, SEM and XPS). The results showed that under optimized conditions (initial pH 2; BPFSB dosage 0.8 g·L−1; TC initial concentration 100 mg·L−1; Contact time 24 h; temperature 298 K), the removal efficiency of TC was as high as 99.03%. The isothermal removal of TC followed well the Langmuir, Freundlich, and Temkin models, indicating that multilayer surface chemisorption dominated the TC removal. The maximum removal capacity of TC by BPFSB at different temperatures was 185.5 mg·g−1 (298 K), 192.7 mg·g−1 (308 K), and 230.9 mg·g−1 (318 K), respectively. The pseudo-second-kinetic model described the TC removal better, while its rate-controlling step was a combination of liquid film diffusion, intraparticle diffusion, and chemical reaction. Meanwhile, TC removal was also a spontaneous and endothermic process, during which the randomness and disorder between the solid–liquid interface was increased. According to the characterization of BPFSBs before and after TC removal, H-bonding and complexation were the major interactions for TC surface adsorption. Furthermore, BPFSB was efficiently regenerated by NaOH. In summary, BPFSB had the potential for practical application in TC removal.

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The data-set used and/or analyzed during this study are available from the corresponding author on reasonable request.

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Funding

This work was supported by Guangxi Key R&D Program Project (Guike AB21220006), National Natural Science Foundation of China (52160016), Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Fund Project (Guikeneng1801Z009), the project of high level innovation team and outstanding scholar in Guangxi colleges and universities (002401013001), and Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science and Education Combined with Science and Technology Innovation Base.

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Qiaojing Liu: Conceptualization, Methodology, Writing—Original Draft. Xinfeng Cao: Validation, Visualization. Tiantian Yue: Validation, Visualization. Fengzhi Zhang: Validation, Visualization. Shaoyuan Bai: Resources, Supervision, Funding acquisition, Project administration. Liheng Liu: Conceptualization, Methodology, Resources, Writing—Original Draft, Writing—Review & Editing, Supervision, Funding acquisition.

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Correspondence to Liheng Liu.

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Responsible Editor: Tito Roberto Cadaval Jr

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Liu, Q., Cao, X., Yue, T. et al. Removal of tetracycline in aqueous solution by iron-loaded biochar derived from polymeric ferric sulfate and bagasse. Environ Sci Pollut Res 30, 87185–87198 (2023). https://doi.org/10.1007/s11356-023-28685-5

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  • DOI: https://doi.org/10.1007/s11356-023-28685-5

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