PURIFICAÇÃO ÁCIDO-BASE EXPERIMENTAL DE CASCAS DE ARROZ CARBONIZADAS: EXPLORANDO SUA EFICÁCIA NA ADSORÇÃO DE RESÍDUOS NÃO VALORIZADOS DA INDÚSTRIA DE ARROZ
DOI:
https://doi.org/10.15628/holos.2023.16309Palavras-chave:
Carvão ativado, modificação, remoção, corante, azul de metilenoResumo
A queima da casca de arroz produz sílica natural e gera um carvão com excelentes propriedades para adsorção de diferentes poluentes. O objetivo deste trabalho foi aprimorar as propriedades de adsorção desse resíduo carbonizado através de purificação ácida e básica. O carvão bruto (RC) foi modificado, primeiramente com HCl(aq.) e em seguida com NaOH(aq.), sendo re-nomeado MC. A eficiência foi investigada pela adsorção do corante azul de metileno (MB), considerando concentração 10 mg L-1, dosagem 0,05 g L-1, pH 6,7, e 120 min. A remoção de MB foi de 78% para RC e 97% para MC, com capacidades experimentais de 144,78 mg g-1 e 180,78 mg g-1, respectivamente. As cinéticas foram melhor ajustadas por Avrami (R2 0,99, erro <2,8%). As propriedades do carvão melhoraram com a modificação, apresentando estrutura mais porosa, maior área superficial e grupos funcionais que contribuíram para a adsorção, provando que métodos simples de purificação podem ser cruciais para a reutilização de resíduos.
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