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AUTHOR(S): Ruki̇ye Özteki̇n, Deli̇a Teresa Sponza
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ABSTRACT The endocrine-disrupting compounds (EDCs) are exogenous substances able to alter the structure or function(s) of the endocrine system and cause adverse effects on several organisms and populations. There are few reports in the literature about the modification of Bismuth oxybromide (BiOBr) with Nitrogen (N2). There are no sufficient reports about N-doped BiOBr nanocomposite to use in the degradation and toxicity removals of Methyl p-hydroxybenzoate, and Ethyl 4-hydroxybenzoate EDCs. Therefore, due to the environmental problem of EDCs in water sources. The main objective of this work was to photodegrade two EDCs in water using the N-doped BiOBr photocatalyst under UV-vis radiation and reduce the toxicity level of these pollutants. Therefore, N-doped BiOBr semiconductor was prepared under laboratory conditions. The N doped BiOBr semiconductor showed the highest photocatalytic activity achieving the complete photodegradation of the EDCs (98-99%) after 25 min. The high efficiency of N doped BiOBr for EDCs removal was attributed to the increase of the specific surface area and the effective separation of photogenerated charges by the effect of N2 incorporation. The main photogenerated species involved in the degradation of the pollutants were the superoxide radicals (O2- ●) and photo-holes (h+), and a possible photocatalytic activation mechanism occurred by the participation of oxygen vacancies. The effects of nanocomposite concentrations, sun light power, EDC concentrations, photodegradation time, pH and temperature on the photodegradation yields of Methyl p-hydroxybenzoate, and Ethyl 4-hydroxybenzoate was studied. For achieving 99-98% photodegradation yields the optimized conditions were as follows: 290 mg/l EDC concentration, 25 min duration, 4 mg/l N-doped BiOBr concentration, 8 W/m2 sun light power, pH=7.0, and 25oC. The high efficiency of N doped BiOBr for EDCs removal was attributed to the increase of the specific surface. The acute toxicity performed by Methyl p-hydroxybenzoate and Ethyl 4-hydroxybenzoate EDCs to Daphnia magna decreased by 98% after photodegradation. Methyl p-hydroxybenzoate with KLH and KS values of 2.34 m3/mg and 1.99 mg/m2.min was photodegraded with high reaction rates compared to Ethyl 4-hydroxybenzoate with low KLH and KS values of 2.29 m3/mg and 1.86 mg/m2.min according to L-H kinetic at 30oC with high regression coefficients values of 0.99. |
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KEYWORDS Acute toxicity; Daphnia magna; Endocrine disruptors compounds (EDCs); Ethyl 4-hydroxybenzoate; Methyl p-hydroxybenzoate; N20BiOBr; N-doped BiOBr nanocomposite; Photocatalytic degradation; Photo-holes (h+); Superoxide radicals (O2- ●) |
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Cite this paper Ruki̇ye Özteki̇n, Deli̇a Teresa Sponza. (2026) Photocatalytic Degradation of Endocrine Disruptors Compounds (EDCs) Namely Methyl p-Hydroxybenzoate and Ethyl 4-Hydroxybenzoate with N-Doped BiOBr Nanocomposites. International Journal of Chemistry and Chemical Engineering Systems, 11, 58-90 |
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