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The influence of ultrasonic pre-treatments on metal adsorption properties of softwood-derived biochar

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Peter, A. et Chabot, B. et Loranger, E. (2020). The influence of ultrasonic pre-treatments on metal adsorption properties of softwood-derived biochar. Bioresource Technology Reports, 11 . ISSN 2589-014X DOI 10.1016/j.biteb.2020.100445

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Résumé

Biomass-derived biochars are studied extensively because of their unique surface properties and efficiency in removing heavy metals from aqueous solution. Power ultrasound pre-treatments are interesting in this context, as they can make significant changes in the physicochemical characteristics of biomass. Herein, we studied their effect on adsorption characteristics of softwood biochar under different conditions of frequency, power, temperature and exposure time of ultrasound. The 40 kHz pre-treated samples exhibited around 0.3 to 0.65 mg/g increase in equilibrium adsorption capacity (Qe) which highly depends on the combination of power versus time and temperature of ultrasound. The isotherm and thermodynamic studies also showed that the mechanical effect of ultrasound plays a vital role in enhancing the surface. Results from this study demonstrated that ultrasound pre-treatment conditions influence the behaviour of biochar towards metal adsorption and ultrasonic pre-treatments can be used as an efficient processing method for biomass residues and the derived products. © 2020 Elsevier Ltd

Type de document: Article
Mots-clés libres: adsorption capacity biochar metal adsorption surface modification ultrasonic pre-treatments adsorption biomass heavy metals softwoods ultrasonics adsorption characteristic derived products equilibrium adsorption capacity mechanical effects physicochemical characteristics processing method thermodynamic studies ultrasound pre treatments chemicals removal (water treatment) article clinical article isotherm ultrasound
Date de dépôt: 01 juill. 2021 14:54
Dernière modification: 01 juill. 2021 14:54
Version du document déposé: Post-print (version corrigée et acceptée)
URI: https://depot-e.uqtr.ca/id/eprint/9630

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