Synthesis of Flower-like Ag-ZnO Nanostructure and its Application in the Photodegradation of Methyl Orange
نویسندگان
چکیده
Materiais nanoestruturados do tipo Ag-ZnO foram sintetizados primeiro preparando um ZnO com morfologia de flor por um método de precipitação e então depositando partículas de Ag diretamente sobre sua superfície, utilizando um método simples de fotorredução. As estruturas foram caracterizadas por microscopia eletrônica de varredura (SEM) e de transmissão (TEM), difratometria de raios X (XRD) e espectrometria de absorção atômica (AAS). Os resultados mostraram que elas são compostas por nanopartículas de Ag metálica dispersas sobre a superfície de ZnO na forma de flor. O efeito fotocatalítico do Ag-ZnO na fotodegradação de alaranjado de metila (MO) sob radiação UV foi investigado em suspensão aquosa. Fatores que influenciam na reação de degradação e descolorização fotocatalítica do MO como pH, teor de Ag, tempo de fotodegradação, concentração do corante orgânico e presença de interferentes tais como Mg, Ca, NO3 -, Cle SO4 2foram estudados. Resultados satisfatórios foram obtidos quando o método fotocatalítico proposto foi aplicado na degradação de MO em várias amostras de água residuais sintéticas.
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