Helinando Pequeno de Oliveira
The hydrothermal growth of ZnO nanorods on surface of TiO2-decorated electrospun fibers of block copolymers (Eudragit L-100) results in hierarchical structures with high surface area and low density. The response is associated with strong photocatalytic activity against organic dyes, such as rhodamine B. X-ray diffraction patterns of composites confirmed the dominant phase of wurtzite in hexagonal nanorods while Raman spectrum and SEM images indicated the progressive growth of ZnO structures on TiO2 seeds (dispersed on electrospun fibers). The action of resulting electrospun fibers under incidence of visible light returns efficiency of degradation of rhodamine B in order of 90% after 1.5 h of reaction. These results indicate that direct incidence of sun light on reaction activates the photodegradation, as a consequence of reduction in the pseudo bandgap of composite which is lower than isolated semiconductors. As a consequence, a reasonable decrease in the cost is associated for large scale applications, due to the elimination in the requirement for UV-chambers for photoactivation, allowing the application of composites in decontamination under direct solar irradiation.