Synthesis of geopolymers from fly and bottom ashes of a thermoelectrical power plant for metallic ions adsorption.

Autor: Peres EC; Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil., Netto MS; Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil., Mallmann ES; Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil., Silva LFO; Department of Civil and Environmental, Universidad De La Costa, Calle 58 #55-66, 080002, Barranquilla, Atlántico, Colombia.; Universidad de Lima, Avenida Javier Prado Este 4600, 1503, Santiago de Surco, Peru., Foletto EL; Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil., Dotto GL; Chemical Engineering Department, Federal University of Santa Maria, Santa Maria, 97105-900, Brazil. guilherme_dotto@yahoo.com.br.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2022 Jan; Vol. 29 (2), pp. 2699-2706. Date of Electronic Publication: 2021 Aug 10.
DOI: 10.1007/s11356-021-15882-3
Abstrakt: A series of geopolymers were synthesized from fly and bottom ashes of a thermoelectrical power plant located in the Brazilian southern, aiming to add value for these wastes. The geopolymers were prepared in conventional and ultrasound-assisted ways and used to uptake Ag + , Co 2+ , Cu 2+ , and Ni 2+ from aqueous solutions. All materials were characterized by infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and N 2 adsorption isotherms (BET and BJH methods). The results revealed that the geopolymers obtained from the conventional method presented slightly higher values of surface area and total pore volume. However, in some cases, the adsorption potential was better for the ultrasound synthesized materials. The geopolymers prepared from both methods presented good adsorption performance concerning Ag + and Cu 2+ , Co 2+ and Ni 2+ . The removal percentages were higher than 90%. In addition, the adsorption capacities were within the literature range. These findings show that the ultrasound technique is not essential to improve the geopolymers production process compared to the conventional process, which generated material with better performance for heavy metals adsorption. Besides, it was possible to aggregate value for fly and bottom ashes, generating promising adsorbent materials.
(© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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