Enhanced activation of ultrasonic pre-treated softwood biochar for efficient heavy metal removal from water

Peter, A., Chabot, B. et Loranger, E. (2021). Enhanced activation of ultrasonic pre-treated softwood biochar for efficient heavy metal removal from water. Journal of Environmental Management, 290 . ISSN 0301-4797 DOI 10.1016/j.jenvman.2021.112569

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Résumé

Physical and chemical modification on biochar is an interesting approach to enhance the properties and make them potential candidates in adsorption of heavy metals from water. Studies have shown that ultrasound treatments as well as alkali activations on biochar has positive impact on adsorption behaviour of the material. Base activation on biochar derived from ultrasound pre-treated woodchips were studied to understand the influence of ultrasound pre-treatment on chemical modification of biochar and the adsorption properties emerged from it. 40 and 170 kHz ultrasound pre-treated softwood woodchips were subjected to laboratory scale pyrolysis and the resulted biochars were treated with NaOH. The physicochemical properties were examined, and the adsorption experiments revealed that ultrasound pre-treatment assisted biochars have better adsorption capacity as compared to untreated biochar samples after activation. 170 kHz pre-treated sample exhibited an equilibrium adsorption capacity of 19.99 mg/g which is almost 22 times higher than that of corresponding non-activated sample. The ultrasound pre-treated samples showed improved competitive adsorption behaviour towards copper ions in comparison with nickel or lead. The overall study suggests that ultrasound pre-treated biochars combined with alkali activation enhances the heavy metal removal efficiency and these engineered biochars can be used as an effective adsorbent in the field of wastewater treatment. © 2021 Elsevier Ltd

Type de document:	Article
Mots-clés libres:	adsorption properties base activation biochar heavy metal removal softwood chips ultrasound pre-treatments activated carbon adsorbent alkali base copper ion deionized water lead nickel sodium ion unclassified drug charcoal heavy metal water adsorption laboratory method physicochemical property pollutant removal ultrasonics water treatment wood article biomass chemical modification contact time controlled study environmental protection ion exchange isotherm kinetic parameters pH physical chemistry pulp and paper industry pyrolysis surface area surface property temperature sensitivity ultrasound waste water management waste water recycling wood chip zeta potential water pollutant metals, heavy water pollutants, chemical
Date de dépôt:	01 juill. 2021 13:07
Dernière modification:	22 juill. 2022 04:00
Version du document déposé:	Post-print (version corrigée et acceptée)
URI:	https://depot-e.uqtr.ca/id/eprint/9642

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