Synthesis and characterization of Ag/CeO2/graphene nanocomposites as catalysts for water-pollution treatment

Charnela Mardani, Muhammad Yose Rizal, Rosari Saleh, Ardiansyah Taufik, Shu Yin

    研究成果: Article査読

    7 被引用数 (Scopus)

    抄録

    Photocatalysts driven by visible (VIS) and ultraviolet (UV) light are highly efficient in photodegrading organic pollutants. To improve the catalytic activity of cerium (IV) oxide (CeO2), in this study, we introduced silver (Ag) into this compound hydrothermally to form Ag/CeO2 nanocomposites with molar ratios 1:1, 1:2, and 1:3. We also used the hydrothermal method to add various graphene contents (3, 5, and 10 wt%) to the optimum Ag/CeO2 catalyst. We employed the synthesized nanocomposites as catalysts to remove methylene blue (MB) under irradiation with light and ultrasound. Photocatalytic studies revealed that among the Ag/CeO2 and Ag/CeO2/graphene composites, a molar ratio of 1:2 Ag to CeO2 and a 5 wt% graphene concentration are optimum; i.e., they demonstrate the best degradation efficiency. The degradation efficiency increases further when we use ultrasound irradiation to assist in the photocatalytic process. Moreover, the Ag/CeO2/graphene composites are stable and reusable. We have confirmed that holes play the main role during the photocatalytic process, and we have identified the major intermediate products. We have also proposed a possible degradation pathway for MB.

    本文言語English
    論文番号147297
    ジャーナルApplied Surface Science
    530
    DOI
    出版ステータスPublished - 2020 11 15

    ASJC Scopus subject areas

    • 化学 (全般)
    • 凝縮系物理学
    • 物理学および天文学(全般)
    • 表面および界面
    • 表面、皮膜および薄膜

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