ESTUDOS DE EQUILÍBRIO NA SORÇÃO DE Cr(III) POR GRANULADOS BIOCLÁSTICOS
DOI:
https://doi.org/10.15628/holos.2016.5098Palavras-chave:
Tratamento de efluentes, sorção, cromo, alga calcáriaResumo
Os Granulados Bioclásticos provenientes de algas calcárias Lithothamnium calcareum são uma fonte mineral marinha e a sua utilização pode não ser recente, porém ainda necessita de diversas pesquisas para avaliar os seus verdadeiros potenciais e níveis de utilização em diferentes segmentos. Este estudo avalia a aplicação deste material para tratamento de soluções aquosas contendo íons Cr(III) através do processo de sorção. Os resultados de remoção e captação mais significativos de íons Cr(III) foram obtidos na faixa de pH entre 4 a 8, correspondendo a 99,9% e 12,4 mg.g-1, respectivamente. Nas concentrações iniciais de 5 a 200 mg.L-1 foram alcançadas remoções ? 97,9%. Para a captação, o valor mais elevado foi obtido na concentração de 350 mg.L-1, correspondendo a 161 mg.g-1. Os modelos de Langmuir, Dubinin-Radushkevich e Temkin ajustaram-se aos dados de sorção apresentando valores de R2 de 0,953, 0,942 e 0,959, respectivamente. Os valores de qmax obtidos do modelo de Langmuir e de Dubinin-Radushkevich foram de 178,57 mg.g-1 e 171,19 mg.g-1, respectivamente. Os resultados de MEV/EDX mostram precipitados com composição elementar de C, O e Cr.Downloads
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