UTILIZAÇÃO DE PÓ DE ROCHA COM Nb2O5: ALTERNATIVA PARA TRATAMENTO DE EFLUENTES INDUSTRIAIS
Palavras-chave:
nióbio, corante, pedreiraResumo
Nesta presente pesquisa, avaliou-se o uso de Nb2O5 e pó de rocha, um subproduto proveniente de pedreiras, como fotocatalisadores na descoloração de efluente sintético. Os materiais foram usados isoladamente em sua forma pura e também combinados, por impregnação úmida, em diferentes proporções (20,50,80% em peso) para identificar se sua sinergia afetaria positivamente a descoloração. As técnicas de Microscopia Eletrônica de Varredura, Difração de Raios X, Adsorção e Dessorção de N2 e Espectroscopia Fotoacústica foram empregadas para caracterização dos materiais. Os materiais puros demonstraram ser excelentes fotocatalisadores nos ensaios experimentais, entretanto, a mistura de pó de rocha com Nb2O5 prejudicou a eficácia na descoloração do corante CI Yellow Basic 96. A caracterização de espectroscopia fotoacústica indicou que a combinação dos materiais alterou a banda de absorção, comprometendo sua ação catalítica. Apesar disso, ambos os materiais, quando usados isoladamente, alcançaram alta descoloração (PR: 85%, Nb2O5: 97%), destacando seu potencial no tratamento de efluentes contendo corante.
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