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    Photocatalytic Decolorization of BR18 and RR180 Dyes by Semiconductor Diode Laser Using CuO for Wastewater Treatment
    (Springer Int Publ Ag, 2022) Polat, Baris; Bilici, Zeynep; Ozay, Yasin; Kucukkara, Ibrahim; Dizge, Nadir
    In this study, the use of copper(II) oxide (CuO) powders as catalyst and continuous wave (CW) multimode semiconductor diode laser (450 nm) was investigated for decolorization of Basic Red 18 (BR18) and Reactive Red 180 (RR180) aqueous dye solutions. The effects of laser power (0.5-2.5 W), pH of solution (2-10), CuO catalyst loading (0.25-1.50 g/L), H2O2 concentration (0.28-2.22 mg/L), initial dye concentration (20-60 mg/L) were studied systematically. Maximum removal efficiency was observed as 100% for RR180 and 94.34% for BR18 under the optimum conditions. Kinetic analysis of BR18 and RR180 dye decolorization reaction indicated that the overall rate order of the reaction was the pseudo first order. CuO demonstrated satisfactory reuse capability as the catalyst for five consecutive cycles without any decrease in its activity for RR180 dye.