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Kinetic modeling of the radiolytic degradation of Acid Orange 7 in aqueous solutions.
Water Res. 2005 Mar; 39(5):839-46.WR

Abstract

The degradation of Acid Orange 7 (AO7) in aqueous solutions induced by gamma-ray irradiation was investigated in terms of both the disappearance of parent molecule (decoloration) and the degree of mineralization. The disappearance of AO7 followed pseudo first-order kinetics, whereas its mineralization could be described by zero-order kinetics. The pseudo first-order degradation rate constants were found to be proportional to irradiation dose rates and the reciprocals of initial AO7 concentrations. Based on the experimental results and a reaction analysis on the steady-state radiolysis of aerated aqueous solutions, a kinetic model was developed for describing the radiolytic degradation of AO7. Moreover, with this kinetic model, the reaction rate constants of e(aq)(-) and H. with AO7 were estimated as 3.0 x 10(9) and 8.4 x 10(9) x L mol(-1) s(-1), respectively. Taking the relative contributions of oxidative and reductive species to AO7 degradation into account, oxidative radiolysis proved to be a better approach for the degradation of AO7.

Authors+Show Affiliations

Department of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026, China.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15743629

Citation

Zhang, Shu-Juan, et al. "Kinetic Modeling of the Radiolytic Degradation of Acid Orange 7 in Aqueous Solutions." Water Research, vol. 39, no. 5, 2005, pp. 839-46.
Zhang SJ, Yu HQ, Zhao Y. Kinetic modeling of the radiolytic degradation of Acid Orange 7 in aqueous solutions. Water Res. 2005;39(5):839-46.
Zhang, S. J., Yu, H. Q., & Zhao, Y. (2005). Kinetic modeling of the radiolytic degradation of Acid Orange 7 in aqueous solutions. Water Research, 39(5), 839-46.
Zhang SJ, Yu HQ, Zhao Y. Kinetic Modeling of the Radiolytic Degradation of Acid Orange 7 in Aqueous Solutions. Water Res. 2005;39(5):839-46. PubMed PMID: 15743629.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetic modeling of the radiolytic degradation of Acid Orange 7 in aqueous solutions. AU - Zhang,Shu-Juan, AU - Yu,Han-Qing, AU - Zhao,Yuan, PY - 2004/07/18/received PY - 2004/11/22/revised PY - 2004/12/05/accepted PY - 2005/3/4/pubmed PY - 2005/7/16/medline PY - 2005/3/4/entrez SP - 839 EP - 46 JF - Water research JO - Water Res VL - 39 IS - 5 N2 - The degradation of Acid Orange 7 (AO7) in aqueous solutions induced by gamma-ray irradiation was investigated in terms of both the disappearance of parent molecule (decoloration) and the degree of mineralization. The disappearance of AO7 followed pseudo first-order kinetics, whereas its mineralization could be described by zero-order kinetics. The pseudo first-order degradation rate constants were found to be proportional to irradiation dose rates and the reciprocals of initial AO7 concentrations. Based on the experimental results and a reaction analysis on the steady-state radiolysis of aerated aqueous solutions, a kinetic model was developed for describing the radiolytic degradation of AO7. Moreover, with this kinetic model, the reaction rate constants of e(aq)(-) and H. with AO7 were estimated as 3.0 x 10(9) and 8.4 x 10(9) x L mol(-1) s(-1), respectively. Taking the relative contributions of oxidative and reductive species to AO7 degradation into account, oxidative radiolysis proved to be a better approach for the degradation of AO7. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/15743629/Kinetic_modeling_of_the_radiolytic_degradation_of_Acid_Orange_7_in_aqueous_solutions_ DB - PRIME DP - Unbound Medicine ER -