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Author: search.filters.author.Prasanseang, WarotSubject: search.filters.subject.Titanium dioxide (TiO2)

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    Item type:Publication,
    Preparation and photocatalytic activities of tio2-rgo nanocomposite catalysts for mb dye degradation over sunlight irradiation
    (2018-01-01)
    Sriwong, Chaval
    ;
    Choojun, Kittisak
    ;
    Tejangkura, Worapol
    ;
    Prasanseang, Warot
    This research aims to investigate photocatalytic activities of titanium dioxide (TiO<inf>2</inf>) incorporated with reduced graphene oxide (rGO) nanocomposite catalysts. These TiO<inf>2</inf>-rGO photocatalysts were easily prepared through a direct-mixing of TiO<inf>2</inf> powder suspended in acidic solution under the different amounts of rGO loading (0.25, 0.50, 0.75 and 1.00 wt%). Then, the obtained TiO<inf>2</inf>-rGO samples were characterized by a several techniques. The results demonstrated that the crystalline phases of all samples are corresponding to pristine TiO<inf>2</inf>, whereas the characteristic peaks of rGO in the TiO<inf>2</inf>-rGO nanocomposites could be observed and also confirmed by Raman spectroscopy. TEM results showed that the TiO<inf>2</inf> nanoparticles were well-combined with rGO nanosheets. Moreover, the photocatalytic activities of all TiO<inf>2</inf>-rGO photocatalyst samples were evaluated by photodegrading of methylene blue (MB) dye solution under natural sunlight irradiation. The results revealed that all TiO<inf>2</inf>-rGO nanocatalysts exhibited much higher activity than those of the bare TiO<inf>2</inf>. The improved photocatalytic activity can be attributed to the presence of rGO nanosheets, leading to the decrease of electron (e<sup>-</sup>)-hole (h<sup>+</sup>) recombination of TiO<inf>2</inf> catalyst, increasing charge transfer rate of electrons and surface-adsorbed amount of MB molecules which enhances the photocatalytic activity.