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Photodegradation of orange I in the heterogeneous iron oxide-oxalate complex system under UVA irradiation.
J Hazard Mater. 2006 Sep 21; 137(2):1016-24.JH

Abstract

To understand the photodegradation of azo dyes in natural aquatic environment, a novel photo-Fenton-like system, the heterogeneous iron oxide-oxalate complex system was set up with the existence of iron oxides and oxalate. Five iron oxides, including gamma-FeOOH, IO-250, IO-320, IO-420 and IO-520, were prepared and their adsorption capacity was investigated in the dark. The results showed that the saturated adsorption amount (gamma(max)) was ranked the order of IO-250 > IO-320 > gamma-FeOOH > IO-420 > IO-520 and the adsorption equilibrium constant (Ka) followed the order of IO-250 > IO-520 > gamma-FeOOH > IO-420 > IO-320. The effect of initial pH value, the initial concentrations of oxalate and orange I on the photodegradation of orange I were also investigated in different iron oxide-oxalate systems. The results showed that the photodegradation of orange I under UVA irradiation could be enhanced greatly in the presence of oxalate. And the optimal oxalate concentrations (C(ox)0) for gamma-FeOOH, IO-250, IO-320, IO-420 and IO-520 were 1.8, 1.6, 3.5, 3.0 and 0.8 mM, respectively. The photodegradation of orange I in the presence of optimal C(ox)0 was ranked as the order of gamma-FeOOH > IO-250 > IO-320 > IO-420 > IO-520. The optimal range of initial pH was at about 3-4. The first-order kinetic constant for the degradation of orange I decreased with the increase in the initial concentration of orange I. Furthermore, the variation of pH, the concentrations of Fe3+ and Fe2+ during the photoreaction were also strongly dependent on the C(ox)0 and iron oxides.

Authors+Show Affiliations

The Faculty of Agriculture, Guangxi University, Nanning 630005, PR China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

16716503

Citation

Lei, Jing, et al. "Photodegradation of Orange I in the Heterogeneous Iron Oxide-oxalate Complex System Under UVA Irradiation." Journal of Hazardous Materials, vol. 137, no. 2, 2006, pp. 1016-24.
Lei J, Liu C, Li F, et al. Photodegradation of orange I in the heterogeneous iron oxide-oxalate complex system under UVA irradiation. J Hazard Mater. 2006;137(2):1016-24.
Lei, J., Liu, C., Li, F., Li, X., Zhou, S., Liu, T., Gu, M., & Wu, Q. (2006). Photodegradation of orange I in the heterogeneous iron oxide-oxalate complex system under UVA irradiation. Journal of Hazardous Materials, 137(2), 1016-24.
Lei J, et al. Photodegradation of Orange I in the Heterogeneous Iron Oxide-oxalate Complex System Under UVA Irradiation. J Hazard Mater. 2006 Sep 21;137(2):1016-24. PubMed PMID: 16716503.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photodegradation of orange I in the heterogeneous iron oxide-oxalate complex system under UVA irradiation. AU - Lei,Jing, AU - Liu,Chengshuai, AU - Li,Fangbai, AU - Li,Xiaomin, AU - Zhou,Shungui, AU - Liu,Tongxu, AU - Gu,Minghua, AU - Wu,Qitang, Y1 - 2006/05/22/ PY - 2005/12/24/received PY - 2006/03/15/revised PY - 2006/03/15/accepted PY - 2006/5/24/pubmed PY - 2007/1/18/medline PY - 2006/5/24/entrez SP - 1016 EP - 24 JF - Journal of hazardous materials JO - J Hazard Mater VL - 137 IS - 2 N2 - To understand the photodegradation of azo dyes in natural aquatic environment, a novel photo-Fenton-like system, the heterogeneous iron oxide-oxalate complex system was set up with the existence of iron oxides and oxalate. Five iron oxides, including gamma-FeOOH, IO-250, IO-320, IO-420 and IO-520, were prepared and their adsorption capacity was investigated in the dark. The results showed that the saturated adsorption amount (gamma(max)) was ranked the order of IO-250 > IO-320 > gamma-FeOOH > IO-420 > IO-520 and the adsorption equilibrium constant (Ka) followed the order of IO-250 > IO-520 > gamma-FeOOH > IO-420 > IO-320. The effect of initial pH value, the initial concentrations of oxalate and orange I on the photodegradation of orange I were also investigated in different iron oxide-oxalate systems. The results showed that the photodegradation of orange I under UVA irradiation could be enhanced greatly in the presence of oxalate. And the optimal oxalate concentrations (C(ox)0) for gamma-FeOOH, IO-250, IO-320, IO-420 and IO-520 were 1.8, 1.6, 3.5, 3.0 and 0.8 mM, respectively. The photodegradation of orange I in the presence of optimal C(ox)0 was ranked as the order of gamma-FeOOH > IO-250 > IO-320 > IO-420 > IO-520. The optimal range of initial pH was at about 3-4. The first-order kinetic constant for the degradation of orange I decreased with the increase in the initial concentration of orange I. Furthermore, the variation of pH, the concentrations of Fe3+ and Fe2+ during the photoreaction were also strongly dependent on the C(ox)0 and iron oxides. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/16716503/Photodegradation_of_orange_I_in_the_heterogeneous_iron_oxide_oxalate_complex_system_under_UVA_irradiation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(06)00272-X DB - PRIME DP - Unbound Medicine ER -