Detsri, Ekarat

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Detsri, Ekarat
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Email
ekarat.de@kmitl.ac.th

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    Item type:Publication,
    Ultrasonically synthesized core-shell Au/Pt nanoparticles decorated g-C3N4heterostructures for enhanced sunlight-driven photocatalytic degradation of aflatoxin B1 in domestic wastewater
    (2025-10-01)
    Mathaweesansurn, Arjnarong
    ;
    Peensuwan, Natthakan
    ;
    Paiboonbudsrakum, Tanyapat
    ;
    Chiangthap, Tanawan
    ;
    Chinnawat, Sirinyakorn
    The discharge of domestic wastewater from washing agricultural products contaminated with aflatoxin B1 (AFB1), even at low concentrations, poses significant risks to food chain integrity and public health. Core-shell Au/Pt nanoparticles anchored on a g-C3N4 heterostructure (Au-PtNPs/g-C3N4) were developed as a highly promising photocatalyst for the efficient degradation of AFB1 in domestic wastewater treatment applications. Herein, core-shell Au-PtNPs were synthesized via a straightforward one-step chemical reduction method assisted by ultrasonic irradiation. The core-shell Au-PtNPs (46.52±0.15nm) were uniformly anchored onto the g-C3N4 nanosheets via hydrogen bonding during ultrasonic dispersion. The Au-PtNPs/g-C3N4 composites were systematically characterized and evaluated for AFB1 photodegradation. Complete removal of AFB1 (50μgL-1) was accomplished within just 1min under natural sunlight using 0.50mg of catalyst at pH 7.0, demonstrating a 6.7-fold enhancement over pristine g-C3N4. Mechanistic investigations confirmed that the AuNPs core induced a surface plasmon resonance (SPR) effect that broadened visible-light absorption, while the PtNPs shell served as an efficient electron sink, facilitating charge separation. Simultaneously, the g-C3N4 nanosheets functioned as a visible-light-responsive photoactive scaffold, promoting effective charge generation and directional migration across the heterojunction interface. These synergistic effects were validated by diffuse reflectance UV-vis spectroscopy, linear sweep voltammetry, electrochemical impedance spectroscopy, photoluminescence quenching, and Mott-Schottky analysis. The combined enhancements significantly promoted the generation of reactive oxygen species (•O-2, •OH and h∗), driving the efficient photodegradation of AFB1. Thus, the Au-PtNPs/g-C3N4 photocatalyst provides a promising, sunlight-driven strategy for AFB1 detoxification in real wastewater from domestic, agricultural and food industry sources.