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Efficient visible-light-driven photocatalytic degradation of nitrophenol by using graphene-encapsulated TiO2 nanowires

Lee, Hyun-Gyu, Sai-Anand, Gopalan, Komathi, Shanmugasundaram, Gopalan, Anantha-Iyengar, Kang, Shin-Won, Lee, Kwang-Pill
Journal of hazardous materials 2015 v.283 pp. 400-409
centrifugation, energy, graphene, irradiation, nanoparticles, nanowires, p-nitrophenol, palladium, photocatalysis, photocatalysts, pollutants, reaction kinetics, spectroscopy, titanium dioxide
In this work, a new hybrid nanocatalyst, namely titanium dioxide (TiO2) composite nanowires, encapsulated with graphene (G) and palladium nanoparticles (Pd NPs) (designated as G-Pd@TiO2-CNWs), was prepared. In preparing the nanowires, a combination of electrospinning and hydrothermal approaches was employed. The visible-light-driven photocatalytic performance of G-Pd@TiO2-CNWs was investigated using the reduction of 4-nitrophenol (4-NP) as a model reaction. The results showed that G-Pd@TiO2-CNWs converted nearly 100% of 4-NP under visible light irradiation. The reaction kinetics of the photocatalytic reduction of 4-NP was studied by UV–vis spectrophotometry and the apparent rate constant was determined and compared with those for other supported TiO2 catalysts. Furthermore, the spent G-Pd@TiO2-CNWs could be recovered by simple centrifugation and reused. The work is expected to shed new light on the development of G-incorporated hybrid nanostructures for harvesting light energy and on the development of new photocatalysts for the removal of environmental pollutants.