Ultraviolet- and visible-light photocatalytic and sonophotocatalytic activities toward Congo red degradation using Ag/Mn3O4 nanocomposites

Muhammad Yose Rizal, Rosari Saleh, Suhendro Purbo Prakoso, Ardiansyah Taufik, Shu Yin

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    Herein, silver/manganese(II,III) oxide (Ag/Mn3O4) composites were used as photocatalysts to degrade the Congo red (CR) dye through photocatalysis (light) and sonophotocatalysis (light + ultrasound) under ultraviolet (UV)- and visible-light irradiation. Mn3O4 was prepared via a conventional sol–gel method, and the composites containing Ag were synthesized with various Ag-to-Mn3O4 molar ratios via a hydrothermal technique. The as-synthesized photocatalysts were characterized by X-ray diffraction, X-ray fluorescence, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, surface plasmonic resonance, Raman spectroscopy, nitrogen adsorption–desorption isotherm measurements, scanning electron microscopy, and transmission electron microscopy. The characterization results revealed that the Mn3O4 nanoparticles were successfully coupled with Ag nanoparticles and that the concentration of Ag nanoparticles influenced the composites’ physicochemical properties. The catalytic activity was observed under optimum pH conditions. A substantial enhancement of the removal of CR was observed when ultrasound was used during the photodegradation process. The samples exhibited excellent stability in four-cycle reusability tests. The addition of a scavenger was also studied to observe the contribution of reactive species.

    Original languageEnglish
    Article number105371
    JournalMaterials Science in Semiconductor Processing
    Volume121
    DOIs
    Publication statusPublished - 2021 Jan

    Keywords

    • Ag/MnO
    • Congo red
    • Photocatalytic
    • Sonophotocatalytic
    • Ultraviolet
    • Visible

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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