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    Photocatalytic performance of ag-humic acid magnetic nanoparticles for degradation of methylene blue in aqueous medium
    (Istanbul University Faculty of Aquatic Sciences, 2024) Özdemir Olgun, Fatoş Ayça; Kaba, İbrahim
    The discharge of organic dyes from industrial plants processing pharmaceuticals, textile fabrics, leather, and petrochemicals is a great concern in terms of water contamination. Even in small amounts less than 1 mgL-1 , dyes have serious effects on the water quality of the aquatic environment. In this study, methylene blue was chosen as a model to represent the azo-dye class that is non-biodegradable, toxic and mutagenic. Photocatalytic degradation is a sustainable and eco-friendly remediation process to eliminate the undesired effects of dye contamination. The morphology of the catalyst highly influences the properties and the efficiency of the catalytic reaction. A novel composite magnetic nanoparticle was synthesized in core-shell structure and characterized with the aid of Scanning Electron Microscope (SEM) images combined with an elemental distribution image (EDX mapping), Zeta Potential, Dynamic Light Scattering (DLS) analyses and Raman Spectrometer. The electronic properties of the fabricated material were enlightened by Mott Schottky measurements. In optical studies, direct band-gap energies were calculated with the aid of Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-DRS). The effective photocatalytic degradation of methylene blue in aqueous medium was maintained with optimum parameters defined within the study. The results support the applicability of the proposed novel magnetic nanoparticle as a catalyst for the degradation of methylene blue in aquatic environment.
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    Photocatalytic performance of ag/humic acid magnetic nanoparticles for degradation of methylene blue in aqueous medium
    (Springer Nature Link, 2025) Kaba, İbrahim; Özdemir Olgun, Fatoş Ayça
    The contamination of water as a result of the discharge of organic dyes from industrial facilities that process pharmaceuticals, textile fabrics, leather, and petrochemicals, is a significant concern. The water quality of the aquatic environment is mostly impacted by pigments, even in small amounts less than 1 mgL−1 (Sharma et al. 2021). Methylene blue which is considered as mutagenic, toxic, and non-biodegradable, was selected as a model in this study to represent the azo dye class. The undesired effects of dye contamination can be eliminated through the sustainable and eco-friendly remediation procedure of photocatalytic degradation. The properties and efficiency of the catalytic reaction are significantly influenced by the morphology of the catalyst. Mott Schottky measurements and chronoamperometry were employed to elucidate the electronic properties of a composite silver humic acid magnetic nanoparticle (Ag/HA MNP) with a core-shell structure. The nanoparticle was subsequently employed in the photocatalytic degradation of methylene blue. The indirect band gap energy was calculated as 1.82 eV by employing Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-DRS). The optimal parameters established in the study were used to maintain the effective photocatalytic degradation of methylene blue in an aqueous medium. Optimization studies for photocatalytic degradation of model dye-MB showed that the optimum degradation percentage (42%) was achieved rapidly in a short time period of 30 min with 0.06 g MNP in 10 mgL−1 solution. The first-order rate constant was determined to be 4.4 × 10−2 s −1 . This study contributes to the literature by proposing Ag/HA magnetic nanoparticles which were synthesized and installed for the first time as a catalyst for the photodegradation of methylene blue in aqueous medium.