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

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Article number147297
    JournalApplied Surface Science
    Volume530
    DOIs
    Publication statusPublished - 2020 Nov 15

    Keywords

    • Ag
    • CeO
    • Graphene
    • Nanocomposites
    • Photocatalytic
    • Sonocatalytic
    • Sonophotocatalytic

    ASJC Scopus subject areas

    • Chemistry(all)
    • Condensed Matter Physics
    • Physics and Astronomy(all)
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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