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Adsorption behavior of lead, cadmium, and arsenic on manganese-modified biochar: competition and promotion

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Abstract

Biochar adsorption of heavy metals has been a research hotspot, yet there has been limited reports on the effect of heavy metal interactions on adsorption efficiency in complex systems. In this study, the adsorbent was prepared by pyrolysis of rice straw loaded with manganese (BC-Mn). The interactions of Pb, Cd and As adsorption on BC-Mn were systematically studied. The results of the adsorption isotherms for the binary metal system revealed a competitive adsorption between Pb and Cd, resulting in decreased Pb (from 214.38 mg/g to 148.20 mg/g) and Cd (from 165.73 mg/g to 92.11 mg/g). A notable promotion occurred between As and Cd, showing an increase from 234.93 mg/g to 305.00 mg/g for As and 165.73 mg/g to 313.94 mg/g for Cd. In the ternary metal system, Pb inhibition did not counteract the promotion of Cd and As. Furthermore, the Langmuir isotherm effectively described BC-Mn's adsorption process in monometallic, binary, and ternary metal systems (R2 > 0.9294). Zeta and FTIR analyses revealed simultaneous competition between Pb and Cd for adsorption on BC-Mn's -OH sites. XPS analysis revealed that As adsorption by BC-Mn facilitated the conversion of MnO2 and MnO to MnOOH, resulting in increased hydroxyl radical production on BC-Mn's surface. Simultaneously, Cd combined with the adsorbed As to form ternary Cd-As-Mn complexes, which expedited the removal of Cd. These results help to provide theoretical support as well as technical support for the treatment of Pb–Cd-As contaminated wastewater.

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Funding

This work supported by National Natural Science Foundation of China (U20A20267) and Major Program Natural Science Foundation of Hunan Province of China (2021JC0001).

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ZG, HFS, J and A conducted the experiments measurements. ZG and YZH conceived this study and designed the experiments. ZG performed the statistical analysis and wrote the manuscript. DCH and YWC coordinated the experiments and oversaw the data analysis. LQ and SMY revised the manuscript. All authors contributed to manuscript revision, read, and approved the submitted version.

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Correspondence to Zhihui Yang.

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No conflict interest exists in the submission of this manuscript, and the manuscript is approved by all authors for publication. The work described was original research that has not been published previously, and is not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.

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Zeng, G., Si, M., Dong, C. et al. Adsorption behavior of lead, cadmium, and arsenic on manganese-modified biochar: competition and promotion. Environ Geochem Health 46, 86 (2024). https://doi.org/10.1007/s10653-024-01865-z

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  • DOI: https://doi.org/10.1007/s10653-024-01865-z

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