Pontos Quânticos de Grafeno Derivados de Lignina Suportados em Óxido de Zinco para a Degradação Fotocatalítica Eficiente de Azul de Metileno
Palavras-chave:
fotocatálise, pontos quânticos de grafeno, lignina, óxido de zinco, azul de metilenoResumo
Este trabalho apresenta a síntese de pontos quânticos de grafeno derivados de lignina comercial (LcGQD), utilizando uma abordagem bottom-up via método hidrotérmico, e sua aplicação em heteroestruturas com ZnO para a degradação fotocatalítica do corante azul de metileno. O material LcGQD foi caracterizado por DLS, MET e ATR-FTIR, visando à identificação de suas propriedades estruturais, morfológicas e funcionais. As heteroestruturas foram preparadas com diferentes proporções de LcGQD (0%, 0,5%, 1,0% e 1,5% p/p) e caracterizadas por DRX e PAS. Os testes fotocatalíticos foram conduzidos em mini-reator batelada, sob irradiação com LED UV-A, branco e full spectrum, avaliando-se diferentes concentrações de fotocatalisador. O sistema contendo 1,5% p/p de LcGQD e 0,2 g·L⁻¹ de fotocatalisador apresentou a maior constante cinética (0,317 min⁻¹), com um aumento significativo de 158% em comparação ao óxido de zinco puro, indicando sinergia entre ZnO e LcGQD. Os resultados demonstram o potencial dos GQDs obtidos a partir de biomassa como modificadores eficientes para semicondutores em processos de fotodegradação, incentivando a valorização de resíduos lignocelulósicos.
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