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Synergistic removal performance and mechanism of Cd(II) and As(III) from irrigation water by iron sulfide-based porous biochar

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Abstract

Since Cd(II) and As(III) have extremely opposite chemical characteristics, it is a huge challenging to simultaneously remove these two ions from aqueous solutions. Therefore, a novel iron sulfide-based porous biochar (FSB) was synthesized and used to evaluate its Cd(II) and As(III) removal performance and mechanisms. The characterization and batch experiments results indicated that FeS was successfully loaded on the surface of biochar and increased its adsorption sites. The iron sulfide-based porous biochar was very favorable for the removal of Cd(II) and As(III) in the weakly acidic environment. The maximum adsorption of Cd(II) and As(III) by FSB was 108.8 mg g−1 and 76.3 mg g−1, respectively, according to the Langmuir and Freundlich isothermal adsorption model, and the adsorption equilibrium time was 12 h and 4 h, respectively, according to the pseudo-second-order kinetic model. In the coexisting ion system, Cd(II) adsorption was suppressed by Ca2+, Mg2+, and humic acid, but enhanced by PO43− and As(III). As(III) adsorption was inhibited by PO43− and humic acid. Precipitation and complexation are the predominant adsorption mechanisms of Cd(II) and As(III), which contribute to the formation of Cd-O, Fe-O-Cd, As-O, Fe-O-As, ternary complex Cd-Fe-As, and stable compounds FeAsO4·2H2O and CdS. Therefore, The iron sulfide-based porous biochar can be an efficient and environmentally friendly candidate for the treatment of Cd(II) and As(III) co-polluted irrigation water.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (42007123 and 42007316), Provincial Natural Science Foundation of Guangxi (2020GXNSFBA159026), Special Project of Guangxi Science and Technology Base and Talent (Guike AD19245181), Research funds of The Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control (1801K005), and Foundation of Guilin University of Technology (GLUTQD2017139).

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All authors contributed to the study conception and design. Yuxi Lu: conceptualization, methodology, formal analysis, writing original draft. Hua Lin: formal analysis, investigation. Yanpeng Liang: formal analysis, investigation, resources. Mi Feng and Zijian Zhou: writing review and editing. Zihao Liang and Huawei Li: investigation, resources. Honghu Zeng and Gongning Chen: writing review and editing, conceptualization, resources, funding acquisition, supervision. And all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Gongning Chen.

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Lu, ., Zeng, H., Lin, H. et al. Synergistic removal performance and mechanism of Cd(II) and As(III) from irrigation water by iron sulfide-based porous biochar. Environ Sci Pollut Res 31, 11591–11604 (2024). https://doi.org/10.1007/s11356-024-31932-y

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  • DOI: https://doi.org/10.1007/s11356-024-31932-y

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