کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
26395 | 43950 | 2015 | 6 صفحه PDF | دانلود رایگان |
• A high decolorization efficiency of 99% for RB181 was achieved after 20 min treatment with UV/H2O2 process.
• Decolorization of RB181 depends on pH, H2O2 dose and dye concentration.
• The decolorization kinetic of RB181 followed pseudo-first-order reaction kinetic.
• The decolorization of RB181 by UV/H2O2 and exposed that the oxidation process was exothermic under natural conditions.
In this study, the decolorization of C.I. Reactive Blue 181 (RB181), anthraquinone dye, by UV/H2O2 processes was investigated. The effects of operating parameters, such as H2O2 dosage, pH value, dye concentration and temperature were examined. The optimum conditions were determined as [H2O2] = 500 mg/L, [RB181] = 500 mg/L and pH 3 for 20 min reaction time. The decolorization was achieved by the UV/H2O2 process because of the production of some oxidizing agents as a result of UV irradiation. The decolorization kinetic of RB181 followed pseudo-first-order reaction kinetic. Thermodynamic analysis showed negative values of ΔH indicating exothermic under natural conditions.
The UV–vis spectra of RB181 during its decolorization of 20 min.Figure optionsDownload as PowerPoint slide
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 299, 15 February 2015, Pages 67–72