Bioadsorção de cromo total com tanino imobilizado de queñua (Polylepis incana) em soluções aquosas
DOI:
https://doi.org/10.35622/Palavras-chave:
adsorção, biossorção, cromo, metais pesados, tratamento de águas residuaisResumo
Os resíduos industriais gerados por curtumes que contêm metais pesados, como Cr(VI) e cromo total, representam graves riscos tanto para o meio ambiente quanto para a saúde pública, devido à sua elevada toxicidade, capacidade mutagênica e potencial carcinogênico. O objetivo deste estudo foi analisar a capacidade de biossorção dos íons de Cr(VI) e de cromo total em soluções aquosas utilizando tanino imobilizado extraído da casca de queñua (Polylepis incana). A metodologia consistiu na obtenção do extrato tânico da casca de queñua e, em seguida, na sua polimerização com formaldeído a 37% para a obtenção do tanino imobilizado. A caracterização do tanino imobilizado foi realizada por espectroscopia no infravermelho (IR), na qual foram identificados grupos funcionais capazes de adsorver o cromo total. A cinética do cromo total ajustou-se melhor ao modelo cinético de pseudo-segunda ordem, no qual qe = 5.568 mg/g indica a quantidade de cromo adsorvida por grama de bioadsorvente em equilíbrio, e k2 = 0.335 g/(mg·min) está associado à taxa global de biossorção; o coeficiente de correlação R2 = 0.9995 indica o melhor ajuste. Conclui-se que o processo de biossorção com tanino imobilizado tem capacidade de adsorver os íons Cr(VI) e cromo total.
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Copyright (c) 2026 Higinio Zuñiga, Roxana Medina (Autor/a)
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