Production of biochar from Melia azedarach seeds for the crystal violet dye removal from water: combining of hydrothermal carbonization and pyrolysis

Nouioua A. Ben Salem D. Ouakouak A. Rouahna N. Baigenzhenov O. Hosseini-Bandegharaei A.
1 December 2023 NLM (Medline)

Bioengineered
2023 #14 Issue 1 290 - 306 pp.

Biochar has shown large potential in water treatment because of its low cost, good textural properties, and high reusability. In this study, two porous biochars were developed from the Melia azedarach seeds via direct pyrolysis process (B-700) and through hydrothermal carbonization followed with pyrolysis (HB-700). They were characterized by morphology, structural characteristics, and surface features and used to adsorb the crystal violet (CV) dye in water environment. Results of the isotherm approaches demonstrated that the removal capacity of these biochars reached 119.4 mg/g for B-700, and 209 mg/g for HB-700 (at 45°C). Also, the Avrami model best fitted the kinetic data. The electrostatic attraction was regarded as one of the adsorptions mechanisms of CV dye. The regeneration tests reveal that both B-700 and HB-700 are good reusable adsorbents. Finally, findings of the study showed that the hydrothermal carbonization method that precede the pyrolysis process can improve significantly the adsorption capacity of the produced biochar.

biochar , carbonization , dye removal , Melia azedarach seeds , pyrolysis

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Research Laboratory in Subterranean and Surface Hydraulics, University of Biskra, Biskra, Algeria
Faculty of Technology, University of El Oued, PO, El Oued, Algeria
Department of Metallurgical Engineering, Satbayev University, Almaty, Kazakhstan
Faculty of Chemistry, Semnan University, Semnan, Iran

Research Laboratory in Subterranean and Surface Hydraulics
Faculty of Technology
Department of Metallurgical Engineering
Faculty of Chemistry

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