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Low cost modified biochars from peanut shells for the removal of textile dyes
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Orientador(es)
Resumo(s)
Biochars from peanut shell wastes were produced and further modified with KOH and HNO3 to efficiently remove two industrial dyes, Mordant Orange 1 and Green Malachite oxalate, in aqueous systems. The materials were characterized through elemental analysis, N2 adsorption isotherms, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and the determination of the point of zero charge, pHPZC. The basic and, particularly, the acid treatments increased the specific surface area by 15 and 43%, respectively, and the pHPZC shifted from 6.2 to 9.1 or 3.3 upon treatments with KOH or HNO3. These modifications impacted the adsorption behavior of the dyes; in the case of Mordant Orange 1, the adsorption capacity increased 2 and 4 times, respectively, when compared with the parent biochar. These results show that the performance of biochars can improve substantially through simple modifications using acid or basic treatments that not only increase the specific surface area but also modify adsorbent/adsorbate interactions.
Descrição
Palavras-chave
Alkali or acid treatment Biochars Peanut shells Pyrolysis Dye adsorption
Contexto Educativo
Citação
Nunes, N., Santos, M. T., & Martins, A. (2023). Low cost modified biochars from peanut shells for the removal of textile dyes. Journal of the Brazilian Chemical Society, 34(6), 885-893. https://doi.org/10.21577/0103-5053.20220156
Editora
Sociedade Brasileira Química