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Peanut Shell-Derived Biochar as a Low-Cost Adsorbent to Extract Cadmium, Chromium, Lead, Copper, and Zinc (Heavy Metals) from Wastewater: Circular Economy Approach

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  • Teddy Ireen Kantoro Mathabatha

    (University of Johannesburg)

  • Anthony Njuguna Matheri

    (University of Johannesburg)

  • Mohamed Belaid

    (University of Johannesburg)

Abstract

The accumulation of heavy metals in water bodies degrades the water quality and availability. Heavy metals are toxic and can be fatal if consumed. Various techniques such as ion-exchange, precipitation, and adsorption have been used to extract heavy metals in wastewater. The process of adsorption will be reviewed in this study since it uses various adsorbents from industrial waste to agricultural waste and is inexpensive. The production of adsorbents from industrial waste produces large amounts of toxins such as greenhouse gases and it is also costly to produce; thus, it was suggested that adsorbents are produce using biomass, which supports both circular economy and sustainability. The most effective biomass adsorbent is activated carbon; however, it has high production costs than biochar. This study will review on synthesis of biochar, its contribution to circular economy, biochar adsorption mechanisms, heavy metals extraction techniques, and peanut shells as an effective adsorbent to extract heavy metals, namely, chromium, cadmium, lead, zinc, and copper and as a low-cost adsorbent. Furthermore, limitations to using peanut shell-derived biochar are identified. Studies were conducted using peanut shells and it was found that even using peanut shell without pyrolysis is effective to remove heavy metals. In one study, raw peanut shells (non-pyrolyzed) were used to extract lead and the peanut shells’ dosages were at 0.5 g, 1.0 g, and 1.5 g and it was found that 74.36%, 74.57%, and 74.05% of lead was extracted, respectively. In other study, the peanut shells were pyrolyzed to produce biochar and used to extract Cr(I II), Cu(II), and Pb(II) and it was found that it extracted 80%, 85%, and 90% of the metal ions, respectively. This shows that biochar adsorbs more heavy metal ions; thus, it is necessary to thermally degrade the biomass before usage. More literature on the usage of peanut shells to extract heavy metals in wastewater are reviewed in this article to further show that peanut shells have potential to be used as an adsorbent.

Suggested Citation

  • Teddy Ireen Kantoro Mathabatha & Anthony Njuguna Matheri & Mohamed Belaid, 2023. "Peanut Shell-Derived Biochar as a Low-Cost Adsorbent to Extract Cadmium, Chromium, Lead, Copper, and Zinc (Heavy Metals) from Wastewater: Circular Economy Approach," Circular Economy and Sustainability, Springer, vol. 3(2), pages 1045-1064, June.
    • Handle: RePEc:spr:circec:v:3:y:2023:i:2:d:10.1007_s43615-022-00207-4
    DOI: 10.1007/s43615-022-00207-4
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    References listed on IDEAS

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    1. Miguel-Angel Perea-Moreno & Francisco Manzano-Agugliaro & Quetzalcoatl Hernandez-Escobedo & Alberto-Jesus Perea-Moreno, 2018. "Peanut Shell for Energy: Properties and Its Potential to Respect the Environment," Sustainability, MDPI, vol. 10(9), pages 1-15, September.
    2. Malyan, Sandeep K. & Kumar, Smita S. & Fagodiya, Ram Kishor & Ghosh, Pooja & Kumar, Amit & Singh, Rajesh & Singh, Lakhveer, 2021. "Biochar for environmental sustainability in the energy-water-agroecosystem nexus," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).
    3. Alhashimi, Hashim A. & Aktas, Can B., 2017. "Life cycle environmental and economic performance of biochar compared with activated carbon: A meta-analysis," Resources, Conservation & Recycling, Elsevier, vol. 118(C), pages 13-26.
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