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Quantification adsorption mechanisms of arsenic by goethite-modified biochar in aqueous solution

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Abstract

In this study, rice straw biochar (BC), goethite (GT), and goethite-modified biochar (GBC) were prepared and their differences in adsorption characteristics and mechanisms of arsenic were explored to provide theoretical and data reference for future design of modified biochar, aiming to address adsorption mechanism weakness and improve the efficiency of arsenic removal in water. Various characterization methods were employed to evaluate the influence of pH, adsorption kinetics, isotherms, and chemical analyses of the materials. At temperatures of 283 K, 298 K, and 313 K, the maximum actual adsorption capacity followed the order GBC > GT > BC, while at 313 K, the maximum Langmuir adsorption capacity of GBC reached 149.63 mg/g which was 95.92 times that of BC and 6.27 times of GT. Due to precipitation and complexation mechanisms, GBC exhibited more superior arsenic adsorption capacities than BC and GT, contributing to total adsorption ranging from 88.9% to 94.2%. BC was dominated by complexation and ion exchange mechanisms in arsenic adsorption, with contribution proportions of 71.8%–77.6% and 19.1%–21.9%, respectively. In GT, the precipitation mechanism played a significant role in total adsorption, contributing from 78.0% to 84.7%. Although GBC has significant potential for removing arsenic from aqueous solutions, the findings suggest that its ion exchange capacity needs improvement.

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The data is available with authors and available on reasonable request.

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Funding

This research was financially supported by the National Natural Science Foundation of China (41977116), Key-Area Research and Development Program of Guangdong Province (2019B110207001, 2020B111137001).

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All authors contributed to the study’s conception and design.

Z Z: Conceptualization, Methodology, Validation, Data Curation, Writing-Review and Editing, Writing-original draft. H F: Writing-Review and Editing, Methodology, Supervision, Funding acquisition, Project administration, Resources. L Z: Validation, Data curation. Y J: Resources, Validation. W Y: Investigation, Data curation. W P: Investigation, Writing-Review and Editing, Project administration. X R: Methodology, Funding acquisition, Project administration, Supervision.

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Correspondence to Fei Huang.

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Zhao, Z., Huang, F., Liu, Z. et al. Quantification adsorption mechanisms of arsenic by goethite-modified biochar in aqueous solution. Environ Sci Pollut Res 30, 74791–74807 (2023). https://doi.org/10.1007/s11356-023-27585-y

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  • DOI: https://doi.org/10.1007/s11356-023-27585-y

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