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Eficiência fotocatalÃtica de partÃculas nanoestruturadas de SnO₂
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ISBN10: 6209704107
ISBN13: 9786209704109
Publisher: Edicoes Nosso Conhecimento
Published: Mar 19 2026
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786209704109
Publisher: Edicoes Nosso Conhecimento
Published: Mar 19 2026
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Portuguese
O mundo sem água é inimaginável e a procura de água potável está a aumentar rapidamente para a sobrevivência de todos os seres vivos. O acesso adequado à água potável é questionável para uma em cada seis pessoas que vivem atualmente. Assim, o presente trabalho centra-se mais no tratamento de água contaminada com poluentes orgânicos e industriais tóxicos através da fotocatálise. As nanopartÃculas de óxido de estanho (SnO2) sintetizadas por co-precipitação foram preferidas como catalisador para realizar a experiência de fotodegradação. A estrutura cristalográfica e os parâmetros celulares foram calculados a partir de dados de XRD. A estrutura tetragonal e rutÃlica com parâmetros de célula calculados a=b=4,735 nm e c=3,185 nm. De acordo com a fórmula de Scherer, o tamanho médio dos cristais é de 11,40 nm. Foi efectuado um estudo termogravimétrico do precipitado antes da calcinação para compreender as reacções termoquÃmicas que ocorrem durante a calcinação. Finalmente, a atividade fotocatalÃtica foi conduzida contra o corante padrão, azul de metileno. A concentração óptima de solução de azul de metileno 10-4M foi gradualmente degradada com a ajuda do fotocatalisador SnO2 sob irradiação UV. O máximo de absorção foi registado para diferentes intervalos de irradiação UV.
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