Source: http://www.proceedings.blucher.com.br/article-details/estudo-das-isotermas-de-adsoro-de-azo-corantes-por-filmes-de-quitosana-11065
Timestamp: 2019-04-22 08:12:33+00:00

Document:
O objetivo deste trabalho foi estudar as isotermas de adsorção dos corantes, amaranto e tartrazina por filmes de quitosana. Os filmes foram preparados pela técnica casting e caracterizados. Os experimentos foram realizados nas seguintes condições: concentração inicial de corante na faixa de 50-300 mg L-1, concentração inicial de filme de 100 mg L-1, pH 2, sendo verificado o efeito da temperatura (298-328 K). Para avaliar as curvas de equilíbrio foram utilizados os modelos de isoterma de Langmuir e Freundlich. Os filmes de quitosana apresentaram espessura inicial de 62±3 μm, tensão de ruptura de 29,7±0,7 MPa e alongamento de 14,1±2,3%. Para ambos os corantes o aumento da temperatura afetou negativamente a capacidade de adsorção. O modelo de Langmuir foi o mais adequado para representar os dados experimentais. Os valores de kL e qm aumentaram com a diminuição da temperatura, mostrando que a adsorção foi favorecida à 298 K. Foi verificado que as capacidades máximas de adsorção aumentaram com a diminuição da temperatura, alcançando valores máximos de 494,1 e 480,0 mg g-1 para os corantes amaranto e tartrazina, respectivamente.
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CAETANO , C. M. B.
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