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Title: Degradation of azo dye orange G in aqueous solutions by persulfate with ferrous ion
Authors: Xu, Xiang-Rong
Li, Xiang-zhong
Subjects: Orange G
Issue Date: 30-Mar-2010
Publisher: Elsevier
Source: Separation and purification technology, 30 Mar. 2010, v. 72, no. 1, p. 105-111.
Abstract: The oxidative degradation of azo dye, Orange G (OG), in aqueous solutions by the persulfate/Fe²⁺ reagent has been investigated. Effects of pH, dosages of persulfate and Fe²⁺, temperature, and the presence of inorganic ions (Cl⁻, NO₃⁻, HCO₃⁻ and H₂PO₄⁻) on OG degradation were examined in batch experiments. The OG degradation by the persulfate/Fe²⁺ reagent was found to follow the first-order kinetic model. Under an optimum condition ([persulfate] = 4 mM, [Fe²⁺] = 4 mM and pH 3.5), the OG degradation in aqueous solutions with an initial concentration of 0.1 mM was achieved by 99% within 30 min. The OG degradation increased with an increased dosage of both persulfate and Fe²⁺. The experimental results showed that increasing the reaction temperature from 293 to 313 K was beneficial to the OG degradation, but not as efficient as chemical activation with Fe²⁺ at ambient temperature. In the meantime, the apparent activation energy for the OG degradation was determined to be 92.2 kJ mol⁻¹. Furthermore, the results demonstrated that the OG degradation could be significantly inhibited due to the existence of inorganic ions in a sequence of NO₃⁻ < Cl⁻ < H₂PO₄⁻ < HCO₃⁻. The experiments also demonstrated that the persulfate/Fe²⁺ reagent can degrade OG in aqueous solutions to a higher degree than the Fenton's reagent, which is beneficial to the mineralization of azo dyes.
Rights: Separation and Purification Technology © 2010 Elsevier. The journal web site is located at
Type: Journal/Magazine Article
DOI: 10.1016/j.seppur.2010.01.012
ISSN: 1383-5866
Appears in Collections:CEE Journal/Magazine Articles

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