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Adsorptive removal of anionic azo dye by Al3+-modified magnetic biochar obtained from low pyrolysis temperatures of chitosan

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Abstract

Magnetic γ-Fe2O3/Al3+@chitosan-derived biochar (m-Fe2O3/Al3+@CB) was prepared by introducing magnetic maghemite (γ-Fe2O3) nanoparticles and aluminum sulfate [Al2(SO4)3] into chitosan-derived biochar (CB) obtained at low pyrolysis temperatures. m-Fe2O3/Al3+@CB was used to remove typical anionic azo dye (Congo red, CR). Effects of initial CR concentration, contact time, initial pH value, background electrolytes, and temperature on CR adsorption by m-Fe2O3/Al3+@CB were studied. Compared with magnetic chitosan-derived biochar (m-Fe2O3@CB), m-Fe2O3/Al3+@CB exhibited excellent performance for a wider range of pH values (pH 1–7) and in the presence of background electrolyte. The introduction of Al3+ is an effective method for improving the properties of magnetic chitosan-derived biochar. High CR adsorption capacity (636.94 mg g−1) of m-Fe2O3/Al3+@CB could result from collaborative effect of flocculation/coagulation and electrostatic attraction. These results demonstrated that m-Fe2O3/Al3+@CB is a potential adsorbent for effective removal of organic dyes from aqueous solution due to its high adsorption capacity and convenient magnetic recovery and stronger anti-interference ability against coexisting anions in wastewater.

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Data are available from the authors upon reasonable request.

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Funding

The authors acknowledge the support from the Zhejiang Provincial Natural Science Foundation of China (grant no. LTY21B070001), the Scientific and Technological Development Project of Taizhou (grant no. 22gya08), and the Science Foundation of Taizhou University for Distinguished Young Scholars (no. 2018JQ001).

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Ru Jiang: conceptualization, methodology, and writing—original draft preparation. Huayue Zhu: supervision, resource, and funding acquisition. Yongqian Fu: visualization, investigation, and data curation. Xin Li: characterization and investigation. Shengtao Jiang: software and formal analysis. Jianbing Li: writing—reviewing and editing.

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Correspondence to Hua-Yue Zhu.

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Responsible Editor: Zhihong Xu

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Jiang, R., Zhu, HY., Fu, YQ. et al. Adsorptive removal of anionic azo dye by Al3+-modified magnetic biochar obtained from low pyrolysis temperatures of chitosan. Environ Sci Pollut Res 30, 44985–44998 (2023). https://doi.org/10.1007/s11356-023-25439-1

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  • DOI: https://doi.org/10.1007/s11356-023-25439-1

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