Tuning the surface properties of biochar by thermal treatment.

Autor: Mendonça FG; Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil., Cunha ITD; Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil., Soares RR; Faculdade de Engenharia Química, Universidade Federal de Uberlândia, Uberlândia 38408-100, Brazil., Tristão JC; Universidade Federal de Viçosa - Campus de Florestal. Rodovia LMG, 818-km 6, Florestal, MG 35690-000, Brazil., Lago RM; Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil. Electronic address: rochel@ufmg.br.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2017 Dec; Vol. 246, pp. 28-33. Date of Electronic Publication: 2017 Jul 24.
DOI: 10.1016/j.biortech.2017.07.099
Abstrakt: In this work, the effect of controlled thermal treatment to tune biochar surface properties such as area/porosity, functionalities and reactivity was investigated. TG-MS, CHN, Raman, IR, BET, Zeta and SEM analyses suggested that thermal treatment led to the decomposition of an organic complex/amorphous phase to produce micropores based on graphene nanostructures and a strong increase on surface area from 3m 2 g -1 for biochar to 30, 408 and 590m 2 g -1 , at 400, 600 and 800°C, respectively. The treatment also led to a gradual decrease on oxygen content from 27 to 14wt% at 800°C due to decomposition of surface functionalities changing surface properties such as zeta potential, adsorption of anionic and cationic species and an increase on the activity for sulfide oxidation which is discussed in terms of increase in surface area and the presence of surface redox quinone groups.
(Copyright © 2017 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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