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The Influence of Biowaste Type on the Physicochemical and Sorptive Characteristics of Corresponding Biochar Used as Sustainable Sorbent

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  • Nikolaos Mourgkogiannis

    (Department of Chemistry, University of Patras, GR-26504 Patras, Greece)

  • Ioannis Nikolopoulos

    (Department of Chemistry, University of Patras, GR-26504 Patras, Greece)

  • Eleana Kordouli

    (Department of Chemistry, University of Patras, GR-26504 Patras, Greece)

  • Alexis Lycourghiotis

    (Department of Chemistry, University of Patras, GR-26504 Patras, Greece)

  • Christos Kordulis

    (Department of Chemistry, University of Patras, GR-26504 Patras, Greece)

  • Hrissi K. Karapanagioti

    (Department of Chemistry, University of Patras, GR-26504 Patras, Greece)

Abstract

Biowaste raw materials were used for biochar preparation through pyrolysis at 850 °C under a limited oxygen atmosphere. Raw materials and the corresponding biochar samples were characterized by XRD, FTIR, SEM, TGA, N 2 -sorption, pH-equilibrium, and ash content measurements. These samples were evaluated as sustainable sorbents for use in methylene blue (MB) removal from artificial fresh water. All biochar samples exhibited high specific surface areas (367–870 m 2 ·g −1 ), low crystallinity, and low population of functional groups (C–O–C, –COOH, –N–O, –N–H, and –OH) on their surfaces. They were mainly micro-porous materials with a significant fraction of pores in the meso-porous range. The specific surface area of the latter pores proved very important for the physical adsorption of MB from aqueous solution. Although the raw materials exhibited low MB sorption capacity, ranging from 29 to 54 mg·g −1 , the corresponding biochar samples exhibited important MB sorption efficiency ranging from 58 to 370 mg·g −1 . Among the biochar samples studied, those produced from coffee residues proved most promising for MB removal from water solution (sorption capacity: 280–370 mg·g −1 ), addressing the United Nations Sustainability Development Goal (SDG) 6: Clean Water and Sanitation by improving the index related to anthropogenic wastewater that has received treatment.

Suggested Citation

  • Nikolaos Mourgkogiannis & Ioannis Nikolopoulos & Eleana Kordouli & Alexis Lycourghiotis & Christos Kordulis & Hrissi K. Karapanagioti, 2024. "The Influence of Biowaste Type on the Physicochemical and Sorptive Characteristics of Corresponding Biochar Used as Sustainable Sorbent," Sustainability, MDPI, vol. 16(7), pages 1-15, March.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:7:p:2889-:d:1367328
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    References listed on IDEAS

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    1. Kyriakou, Maria & Chatziiona, Vasiliki K. & Costa, Costas N. & Kallis, Michalis & Koutsokeras, Loukas & Constantinides, Georgios & Koutinas, Michalis, 2019. "Biowaste-based biochar: A new strategy for fermentative bioethanol overproduction via whole-cell immobilization," Applied Energy, Elsevier, vol. 242(C), pages 480-491.
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