Bioadsorbents using malt bagasse from brewery waste

Autores

  • Rayssa Layza Lima Xavier UECE Autor
  • Antônio David Aragão de Oliveira UNEB Autor
  • Venicius Henrique Santiago de Lima UECE Autor
  • Regina Claudia Rodrigues dos Santos UECE Autor
  • Rômulo Batista Vieira UNILAB Autor

Palavras-chave:

remediation, residual biomass, equilibrium

Resumo

The textile industry produces large volumes of effluents containing polluting chemical substances, such as dyes. Treating these contaminants is essential to minimize their socio-environmental impacts. [1]. A promising alternative is the use of agro-industrial waste, such as malt bagasse, which is abundant and inexpensive, as a bioadsorbent to remove dyes and heavy metals. [2] Thus, the goal of this work is to explore the potential of malt bagasse on methylene blue adsorption. The pristine, acid-modified (HCl, HNO3, H2SO4, and H3PO4) and activated carbon pyrolyzed at different temperature (500, 600, 700, and 800 °C) from malt bagasse were studied. These bioadsorbents were characterized by X-ray diffraction, indicating the presence of diffraction peaks at 16.4, 21.7° characteristics of lignocellulosic biomass (cellulose I), Fig. 1A (i). [3]. After the acid treatment, Fig. 1 (ii-v), there was no long-distance change in biomass structure. For activated carbons, Fig. 1A (ii-v), the cellulose I peak disappeared, suggesting a destruction of the lignocellulosic chains from malt bagasse; the presence of a diffraction peak at ~24° is consistent of a carbon amorphous arrangement. [1]. Just in CM@800, Fig. 1B (v), there was the appearance of peaks at 22 and 30° characteristics of inorganic minerals. The performance of bioadsorbents were evaluated by methylene blue adsorption at different concentrations (10–200 mg∙L-1 ), Fig. 1C. A highlight for MC@800, which removed 100% of methylene blue in all concentration studied. Meanwhile, the MB@HNO3 removed 100% of methylene blue in 50 and 100 mg∙L -1 concentrations. These bioadsorbents were submitted to the adsorption kinetics (180 min). Again, both adsorbents removed 100% of the methylene blue after 15 min, 200 mg∙L-1 for CM@800 and 100 mg∙L-1 MB@HNO3, respectively. According to the adsorption isotherms (not shown here), the CM@800 presented a characteristic kinetic profile of physisorption and the MB@HNO3, it displayed a chemisorption profile, respectively. This difference may be attributed to the oxidation of the malt surface (hydroxyl groups) in MB@HNO3, resulting in a stronger interaction with the methylene blue when compared to MC@800 bioadsorbent.

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Referências

[1] MOPOUNG, S.; DEJANG, N. Sci. Rep., 11, 13948, 2021.

[2] FONTANA, K. B. et al. Ecotoxicol. Environ. Saf., 124, 329-336, 2016.

[3] EL OUDIANI, A. et al. Carbohydr. Polym., 86, 1221-1229, 2011.

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Publicado

15-11-2024

Edição

Seção

Síntese e caracterização de catalisadores e adsorventes.

Como Citar

LAYZA LIMA XAVIER, Rayssa; DAVID ARAGÃO DE OLIVEIRA, Antônio; HENRIQUE SANTIAGO DE LIMA, Venicius; CLAUDIA RODRIGUES DOS SANTOS, Regina; BATISTA VIEIRA, Rômulo. Bioadsorbents using malt bagasse from brewery waste. XIV Encontro de Catálise do Norte, Nordeste e Centro-Oeste, Brasil, 2024. Disponível em: https://submissao.sbcat.org/index.php/xivencat/article/view/81. Acesso em: 26 dez. 2024.

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