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Information × Registration Number 0225U001345, (0124U002973) , R & D reports Title Study of conditions for photocatalytic decomposition of polyaromatic hydrocarbons as environmental pollutants popup.stage_title Дослідження умов фотокаталітичного розкладання поліароматичних вуглеводнів як забруднювачів навколишнього середовища Head Shcherbakov Ilias B., к.х.н. Registration Date 30-01-2025 Organization State Scientific Institution Scientific and Technological Complex" Institute of Single Crystals "of the National Academy of Sciences of Ukraine popup.description1 To study the influence of the conditions of photocatalytic reactions of decomposition of polyaromatic hydrocarbons. popup.description2  The aim of the project was to investigate the influence of reaction conditions on the photocatalytic decomposition of polycyclic aromatic hydrocarbons (PAHs). During the project, the photocatalytic activity of nanomaterials with compositions TiO₂:ZnO, TiO₂:MoO₃, and ZnO:ZrO₂ was studied in aqueous solutions of various PAHs: naphthalene, acenaphthene, pyrene, acenaphthylene, fluorene, phenanthrene, and fluoranthene under UV irradiation. Surface morphology analysis of the nanomaterials using scanning electron microscopy revealed that particle sizes were 70 nm or larger. Diffuse reflectance spectroscopy results showed that the band gap width of the studied samples was Eg = 3.09–3.23 eV. The photocatalytic decomposition of naphthalene and acenaphthene on all tested materials was relatively rapid, which complicated the identification of intermediate products of the photocatalytic reaction. Gas chromatography with mass detection established that the intermediate degradation products of pyrene were bis(2-ethylhexyl) phthalate and dibutyl phthalate. The highest degradation rates for naphthalene, acenaphthene, and pyrene were achieved within 3 hours (100% for naphthalene and acenaphthene, while for pyrene it was 83–87%). Fluoranthene demonstrated nearly twice the resistance to photocatalytic decomposition compared to naphthalene, acenaphthene, and pyrene, indicating increased stability of its condensed aromatic system under UV irradiation. The photocatalytic decomposition of PAHs concluded with their mineralization, which was confirmed by determining the total organic carbon content using the potassium dichromate oxidation method. In the study of photocatalytic decomposition of PAH mixtures, in addition to aromatic compounds, dienes, cycloalkenes, and esters of hexadecanoic and tetradecanoic acids were identified. This indicates the complex nature of numerous processes involved in the photocatalytic degradation of PAHs and underscores the necessity for further research. Product Description popup.authors Bielikov Kostiantyn M. Hryshyna Olena V. Lytvynova Olena M. Puzhaichereda Marharyta O. TIMONINA Alvard R. Shcherbakov Ilias B. popup.nrat_date 2025-01-30 Close