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Comparison of Adsorption Performance of Biochar Derived from Urban Biowaste Materials for Removal of Heavy Metals

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Abstract

This study investigated the adsorption performance of biochar produced from different types of urban biowaste material viz., sugarcane bagasse (SB), brinjal stem (BS), and citrus peel (CP) for removal of heavy metal ions (Pb, Cu, Cr, and Cd) from aqueous solution. The effects of biowaste material, dosage of biochar, solution pH, and initial concentration of heavy metal ions and isotherm models were performed to understand the possible adsorption mechanisms. The results showed that the biochar derived from BS and SB removes Cu (99.94%), Cr (99.57%), and Cd (99.77%) whereas biochar derived from CP removes Pb (99.59%) and Cu (99.90%) more efficiently from the aqueous solution. Biochar derived from BS showed maximum adsorption capacity for Cu (246.31 mg g−1), Pb (183.15 mg g−1), and Cr (71.89 mg g−1) while the biochar derived from CP showed highest for Cd (15.46 mg g−1). Moreover, biochar derived from BS and SB has more polar functional groups and less hydrophobicity than the biochar derived from CP. This study reveals that solution pH and biochar doses play a major role in removal of heavy metal ions from aqueous solution. The results of Langmuir model fitted well for Pb and Cu while the Freundlich model for Cr and Cd. Our study concludes that the biochar derived from different biowaste materials adsorbs heavy metal ions majorly through surface complexation and precipitation processes. The results of this study will be very useful in selecting the effective urban biowaste material for making biochar for heavy metal removal from the aqueous environment.

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Highlights

  • Sugarcane bagasse, brinjal stem, and citrus peel from metropolitan areas have potential for production of biochar.

  • Biochar derived from SB and BS adsorb more Cu, Cr, and Cd ions.

  • Biochar adsorption performance varies with different pH levels and biowaste materials.

  • Langmuir isotherm model was well fitted for Pb and Cu while Freundlich model for Cr and Cd ions.

  • Biochars mostly adsorb heavy metal ions by surface complexation and precipitation.

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Data availability

The data used for this study are available from the corresponding author and first author on request.

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Acknowledgements

HC acknowledges the financial support from University Grants Commission (UGC), India. Support of University Science Instrumentation Centre (USIC), University of Delhi for providing instrumentation facilities is duly acknowledged. Financial support from University of Delhi under Institution of Excellence programme is duly acknowledged.

Author Contributions

HC conceptualized and contributed to the preliminary concept of the study under the supervision of Prof. K.S Rao and Dr. J. Dinakaran. HC collected the primary data and completed all investigations and formal analysis. TN and KV gave lab support while investigating. HC drafted the first version and JD supported in all necessary revisions and editing in the manuscript. KSR gave intellectual input to the manuscript revising it critically. Finally, all the authors approved this final version.

Funding

This work was supported by University Grants Commission (UGC) and University of Delhi under Institution of Excellence programme (IoE/2021/12/FRP).

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Correspondence to Hina Chaudhary or K. S. Rao.

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Chaudhary, H., Dinakaran, J., Notup, T. et al. Comparison of Adsorption Performance of Biochar Derived from Urban Biowaste Materials for Removal of Heavy Metals. Environmental Management 73, 408–424 (2024). https://doi.org/10.1007/s00267-023-01866-1

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  • DOI: https://doi.org/10.1007/s00267-023-01866-1

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