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    Advanced photo-Fenton assisted degradation of tetracycline antibiotics using ?-Fe2O3/CdS/SiO2 based S-scheme photocatalyst
    (Elsevier, 2024) Sharma, Kirti; Sudhaik, Anita; Sonu; Kumar, Rohit; Nguyen, Van-Huy; Le, Quyet Van; Ahamad, Tansir
    In the present work, we have explored the construction of ternary alpha-Fe2O3/CdS/SiO2 S-scheme nanocomposite for the removal of tetracycline (TC) antibiotic. The ternary alpha-Fe2O3/CdS/SiO2 nanocomposite was fabricated using the co-precipitation method and was characterized via various analytical and spectroscopic techniques to explore their structural properties. The alpha-Fe2O3/CdS binary magnetic nanocomposite was attached to the surface of SiO2 nanoparticles, which served as an effective support material with improved chemical stability and good visible-light absorption capabilities. Among the synthesized bare (alpha-Fe2O3, CdS, SiO2) and ternary photocatalysts, the alpha-Fe2O3/CdS/SiO2 nanocomposite exhibited the highest TC photodegradation efficiency (99 %) at pH 3 within 120 min of light illumination using 60 mg/L catalyst dose and 7 x 10(-4) M of H2O2 concentration (30 % V/V). In comparison to bare photocatalysts, the photo-Fenton assisted photocatalytic reactions of ternary heterojunction boosted charge carrier separation and mobility (confirmed from PL and EIS analysis). Additionally, it could prolong the reactive oxygen species generation which significantly improved the degradation rate of TC by ternary nanocomposite. Furthermore, the generation of superoxide (O-center dot(2)-) and hydroxyl ((OH)-O-center dot) radicals, i.e. reactive oxygen species, played an imperative role in the TC degradation process which were validated through scavenging experiments and ESR analysis. This study displayed the effectiveness of the S-scheme alpha-Fe2O3/CdS/SiO2 ternary heterostructure-based Photo-Fenton system exhibiting enhanced charge separation and migration for boosted photocatalytic efficiency. After four rounds, the photocatalytic activity demonstrated only a minor decline in catalytic efficiency.
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    Unveiling cutting-edge developments in defective BiOI nanomaterials: Precise manipulation and improved functionalities towards bolstered photocatalysis
    (Elsevier, 2025) Soni, Vatika; Malhotra, Monika; Singh, Archana; Khan, Aftab Aslam Parwaz; Kaya, Savas; Katin, Konstantin; Le, Quyet Van
    Defect engineering represents a paradigm shift in tailoring nanomaterials for enhanced catalytic performance across various applications. This manuscript succinctly highlights the significance of defect engineering in improving the catalytic performance of BiOI nanoparticles for multiple applications, particularly in photocatalysis. The photocatalytic process of BiOI semiconductor is intricately linked to its indirect bandgap and layered crystalline structure. By influencing the structural dynamics of its layered materials, defects contribute significantly to optimizing its catalytic performance. Fundamental insights into manipulating defects, including oxygen and iodine vacancies, bismuth defects, and synergistic dual defects, in BiOI are meticulously discussed. Advanced characterization techniques, spanning spectroscopy to microscopy, are explored for precise defect identification and quantification. The fragile van der Waals forces foster interactions between adjacent iodine atoms in BiOI, contributing to the overall structural stability. Understanding these structural intricacies lays a robust foundation for comprehending and exploring the exceptional physicochemical properties of twodimensional BiOI. The manuscript showcases BiOI potential in energy and environmental sectors, ranging from solar-driven H2 evolution to CO2 reduction and various harmful pollutant degradation. By unravelling the intricate interplay between defects and catalytic activity, this manuscript sets a new benchmark for tailored catalytic solutions. This manuscript offers a comprehensive overview of defect engineering in BiOI and charts a path towards sustainable and efficient photocatalytic systems. It underscores the imperative of meticulous defect control and innovation in addressing the pressing challenges of the energy and environmental landscape.