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Author: search.filters.author.Areerob, YonrapachSubject: search.filters.subject.Graphene

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    A Novel Synthesis of Rod-Shape BaNiSn-Graphene Decorated TiO2 Composite as a Ternary Photocatalyst to Improve Visible-Light Driven H2 Evolution with Lactic Acid and TEA
    (2023-03-01)
    Areerob, Yonrapach
    ;
    Rafat, Md Nazmodduha
    ;
    Ullah, Kefayat
    ;
    Oh, Won Chun
    A novel rod-shape BaNiSn-Graphene oxide decorated TiO<inf>2</inf> composite (BaNiSn-GT) has been synthesized using a simple ultrasonic method to enhance the visible-light-driven H<inf>2</inf> evolution with cationic scavengers. The unique structure between the interfaces of BaNiSn-Graphene and TiO<inf>2</inf> provides graphene oxide of contact and excellent electron transfer for H<inf>2</inf> evolution activity. The BaNiSn-GT ternary photocatalyst exhibits relatively high photocatalytic activity with a hydrogen evolution rate of 1012 μmol/g during 4 h. On the other hand, BaNiSn-GT composite exhibited significantly higher hydrogen evolution rates of 870 μmol/g with TEA scavenger and 730 μmol/g with LA scavenger during 1 h, respectively. Moreover, the higher photocurrent density of BaNiSn-GT is correlated with electron–hole recombination, providing evidence for its inhibition, which leads to a longer lifetime of carriers produced by photoelectrons. The mechanism of the photocatalytic H<inf>2</inf> evolution of BaNiSn-GT based on a full physicochemical characterization was proposed. This study provides new insight into the efficient hydrogen-evolution of graphene-based photocatalysts.
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    Fe2O3-graphene anchored Ag nanocomposite catalyst for enhanced sonocatalytic degradation of methylene blue
    (2021-05-01)
    Noypha, Amnuay
    ;
    Areerob, Yonrapach
    ;
    Chanthai, Saksit
    ;
    Nuengmatcha, Prawit
    In the present research work, Fe<inf>2</inf>O<inf>3</inf>-graphene-Ag (FGA) was synthesized by a simple hydrothermal method. The sonocatalytic activity of the FGA particles was evaluated by the degradation of methylene blue (MB) under ultrasonic irradiation, revealing their good sonocatalytic activity. The effects of various experimental factors, such as dosage, time, and ultrasonic frequencies on the sonocatalytic efficiency were investigated; a significant influence of different factors on the sonocatalytic degradation of MB was observed, whereas the best degradation conditions were obtained when ultrasonic irradiation was performed for 90 min at room temperature considering MB concentration = 0.5 g L<sup>−1</sup>, C<inf>catalyts</inf> = 1 g L<sup>−1</sup>, and pH 6.5. Moreover, the sonocatalytic activity of the FGA was compared to that of Fe<inf>2</inf>O<inf>3</inf> (F), graphene (G), and Fe<inf>2</inf>O<inf>3</inf>-graphene (FG). As a result, the FGA was found to exhibit higher sonocatalytic activity than other catalysts (FGA > FG > G > F), which evidenced the practical utility of the synthesized FGA as a highly effective catalyst for the removal of dye pollutants. Finally, the plausible sonocatalytic mechanism of FGA is also discussed in this work.