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In this study microwave-assisted reduction (MrGO) and direct reduction of graphene oxide (rGO) by Ti powders were established, and the effect of the reaction conditions on the reduction were discussed. The results showed that GO can be effectively reduced by both methods, however, microwave assistance can greatly shorten the reduction time. The produced Ti ions from the reaction of Ti powder with GO were transferred to TiO 2 by hydrolysis and formed MrGO/TiO 2 and rGO/TiO 2 . They were used as adsorbents for the removal of methylene blue (MB). MrGO/TiO 2 showed a higher adsorption capacity ( q max , 845.6 mg/g) than rGO/TiO 2 ( q max , 467.6 mg/g). Investigation on the adsorption MB onto MrGO/TiO 2 was conducted and demonstrated that adsorption kinetics followed the pseudo second-order kinetics model and the adsorption isotherm was well described by the Langmuir isotherm model. The recycling of MrGO/TiO 2 was achieved by photocatalytic degradation of MB catalyzed by MrGO/TiO 2 itself. [ABSTRACT FROM AUTHOR]

Abstract: In the present study, a facile method is developed for the synthesis of graphene oxide-Ag nanocomposite (GOAg). The method involves the application of in situ photochemical deposition and growth processes under certain alkaline environments in the absence of chemical reductants and surfactants. Silver nanoparticles with monodisperse size are well dispersed on the surface of graphene oxide (GO). The roles of GO and NaOH in the formation of GOAg are discussed. A corresponding formation mechanism of GOAg is proposed. Fluorescence quenching and Raman enhancement are examined as well. [Copyright &y& Elsevier]