Detsri, Ekarat

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

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    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.
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    Ultrasonic-driven chemical reduction synthesis of alizarin complexone-modified gold nanoparticles for dual-signal colorimetric and fluorometric sensing of histamine in seafood products
    (2024-12-01)
    Phoungsiri, Ampika
    ;
    Lerdpiriyaskulkij, Natee
    ;
    Mathaweesansurn, Arjnarong
    ;
    Detsri, Ekarat
    Alizarin complexone-modified gold nanoparticles (Au<sup>0</sup>-NPs<inf>ALz</inf>) were synthesized using a proposed ultrasonic irradiation-assisted chemical reduction method. Ultrasonic irradiation powers, reaction time and alizarin complexone concentration had been proven to be the main parameters for controlling the nucleation and growth of Au<sup>0</sup>-NPs<inf>ALz</inf>. In the synthesized ultrasonic irradiation-assisted chemical reduction conditions, Au<sup>0</sup>-NPs<inf>ALz</inf> had a spherical oriented morphology with a uniform size of 17.84 ± 1.37 nm and are shiny red with a surface plasmon resonance (SPR) of 535 nm. A rapid colorimetric and fluorometric dual-mode detection strategy for selective detection of histamine in seafood was developed based on the self-assembly of Au<sup>0</sup>-NPs<inf>ALz</inf>-Ni (II) complexes. Ni (II) can capture the histamine molecules close to Au<sup>0</sup>-NPs<inf>ALz</inf> surfaces, making changes in the colorimetric and fluorometric responses of the solution. The quantitative analysis of histamine was realized through the variation of dual-signal colorimetric and fluorometric responses. Such Au<sup>0</sup>-NPs<inf>ALz</inf> sensor offered good detection sensitivity for histamine with a detection limit (LOD) of 59.32 μmol L<sup>−1</sup> and 116.20 μmol L<sup>−1</sup> and wide linear response within the range of 10–10000 μmol L<sup>−1</sup> (R<sup>2</sup> = 0.9952) and 100–5000 μmol L<sup>−1</sup> (R<sup>2</sup> = 0.9947) for colorimetric and fluorometric measurement, respectively. Recoveries ranging from 94.99 to 103.29 % and 97.67–106.88 % for colorimetric and fluorometric assay were obtained, showing low levels of matrix effects. Particularly, the results of the dual-mode sensor were also validated by comparing with the HPLC method for improving the assay accuracy and dependability. Ultimately, the developed Au<sup>0</sup>-NPs<inf>ALz</inf> colorimetric and fluorometric probe performs excellently in practical applications, with promising results for detecting histamine in seafood products.