DOI: 10.51435/turkjac.1990469 ISSN: 2687-6698

Photocatalytic degradation of Reactive Orange 107 in wastewaters under UV irradiation using CoSe nanoparticles: Performance evaluation, kinetic assessment and mechanistic insights

Murat Kıranşan
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This study reports the photocatalytic degradation of Reactive Orange 107 (RO 107) in media using synthesized CoSe nanoparticles. The catalysts were characterized by XRD, FT-IR, SEM-EDX, HRTEM, N2 adsorption–desorption, BET, and BJH analyses, verifying crystalline CoSe formation, porous architecture, morphology and elemental distribution. Under optimized conditions of 1.0 g L⁻1 catalyst dosage, 25 mg L⁻1 RO107 concentration, natural pH, and irradiation source UV-C, CoSe achieved 97.87% degradation within 120 min. Decreasing the RO 107 concentration to 5 mg L⁻1 increased the efficiency to 98.17%, confirming high activity at low pollutant loading. The degradation followed pseudo-first-order kinetics, with kapp values of 0.0110–0.0646 min⁻1 depending on catalyst dosage, 0.0111–0.0709 min⁻1 for initial RO 107 concentration, and 0.0116–0.0723 min⁻1 under pH conditions. Water matrix inhibition followed distilled water (97.87%) > tap water (94.92%) > river water (89.16%) > lake water (86.58%). Dye degradation followed BY2 (99.82%) > RO107 (97.87%) > AO7 (95.12%) > CR (92.78%) > MG (90.65%) > RB19 (86.35%). The degradation efficiency was strongly influenced by the irradiation wavelength, following the order UV-C > UV-B > UV-A. After 120 min of reaction, the highest degradation efficiency was achieved under UV-C irradiation (97.87%), while lower efficiencies were obtained under UV-B (89.17%) and UV-A (80.69%) irradiation. The best activity was obtained at 0.8–1.5 g L⁻1 catalyst dosage and 5–25 mg L⁻1 RO 107 concentration, while reusability tests showed a decrease from 97.87% to 81.23% after six cycles, indicating promising stability.

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