Preparation and characterization of steam and CO2 activated carbon from Brazil nut shell

Pryscila Machado de  Castro; Stela Regina Ferrarini; Michelle da Silva Ferreira  Rimoli; Aloir Antônio  Merlo; Roberta  Martins Nogueira; Evaldo Martins Pires

doi:10.14393/BJ-v39n0a2023-64438

Authors

Pryscila Machado de Castro Universidade Federal de Mato Grosso
Stela Regina Ferrarini Universidade Federal de Mato Grosso https://orcid.org/0000-0003-4339-1307
Michelle da Silva Ferreira Rimoli Universidade Federal de Mato Grosso https://orcid.org/0000-0002-5099-0204
Aloir Antônio Merlo Universidade Federal do Rio Grande do Sul https://orcid.org/0000-0002-8071-5297
Roberta Martins Nogueira Universidade Federal de Mato Grosso
Evaldo Martins Pires Universidade Federal do Mato Grosso https://orcid.org/0000-0003-0647-084X

DOI:

https://doi.org/10.14393/BJ-v39n0a2023-64438

Keywords:

Activated carbon, Activation method, Adsorption.

Abstract

Activated carbon is a porous material with several industrial applications. In this research, brazil nut shell was used to produce activated carbon, a promising raw material based on its low cost and high quality. Also, nut processing generates an extensive amount of waste, requiring proper disposal. The carbon was produced at temperatures of 600, 700, and 800 °C and activated by physical method using steam or CO₂. Yield was calculated, and the activated carbon was analyzed according to the following physical-chemical parameters: water content, volatile material, fixed carbon, ash, apparent density, and pH. Infrared spectroscopy and BET adsorption isotherms were also performed. The fixed carbon contents of the carbons produced at 700 and 800 °C remained above 84%. The pH values characterized them as basic. The surface areas of the carbon obtained at 800 °C were 397 ± 8 m² g^–1 and 325 ± 7 m² g^–1 in those which were activated by steam and CO₂, respectively.

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