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Heterogeneous photodegradation of bisphenol A with iron oxides and oxalate in aqueous solution.
J Colloid Interface Sci. 2007 Jul 15; 311(2):481-90.JC

Abstract

To understand the degradation of endocrine disrupting chemicals (EDCs) with existence of iron oxides and polycarboxylic acids in the natural environment, the photodegradation of bisphenol A (BPA) at the interface of iron oxides under UV illumination was conducted. Four iron oxides were prepared by a hydrothermal process and then sintered at different temperatures of 65, 280, 310, and 420 degrees C named "IO-65," "IO-280," "IO-310," and "IO-420," respectively. The prepared iron oxides were characterized by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) methods. The XRD pattern of IO-65 showed a crystal structure of lepidocrocite (gamma-FeOOH) and that of IO-420 demonstrated a crystal structure of hematite (alpha-Fe(2)O(3)), while IO-280 and IO-310 have the mixed crystal structures of maghemite (gamma-Fe(2)O(3)) and hematite. The BET results revealed that the specific surface areas decreased with the increase of sintering temperature. The results demonstrated that the photodegradation of BPA depends strongly on the properties of iron oxides and oxalate, and pH. The properties of iron oxides influenced strongly the dependence of the BPA degradation on the oxalate concentration. The optimal initial concentrations of oxalate for BPA degradation under UV illumination were determined to be 2.0, 2.0, 2.4, and 2.0 mM for IO-65, IO-280, IO-310, and IO-420, respectively. The first-order kinetic constants k for BPA degradation under UV illumination in the presence of oxalate with the optimal initial concentration are ranked as IO-280>IO-310>IO-65>IO-420. The experiments demonstrated that the optimal pH value should be in the range of 3-4. Furthermore, the dependence of BPA degradation should be also attributable to the formation of the dissolved Fe-oxalate in the solution and the adsorbed Fe-oxalate on the surface of iron oxides, and also the formation of hydrogen peroxide.

Authors+Show Affiliations

Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China. cefbli@soil.gd.cnNo 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

17451730

Citation

Li, F B., et al. "Heterogeneous Photodegradation of Bisphenol a With Iron Oxides and Oxalate in Aqueous Solution." Journal of Colloid and Interface Science, vol. 311, no. 2, 2007, pp. 481-90.
Li FB, Li XZ, Li XM, et al. Heterogeneous photodegradation of bisphenol A with iron oxides and oxalate in aqueous solution. J Colloid Interface Sci. 2007;311(2):481-90.
Li, F. B., Li, X. Z., Li, X. M., Liu, T. X., & Dong, J. (2007). Heterogeneous photodegradation of bisphenol A with iron oxides and oxalate in aqueous solution. Journal of Colloid and Interface Science, 311(2), 481-90.
Li FB, et al. Heterogeneous Photodegradation of Bisphenol a With Iron Oxides and Oxalate in Aqueous Solution. J Colloid Interface Sci. 2007 Jul 15;311(2):481-90. PubMed PMID: 17451730.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Heterogeneous photodegradation of bisphenol A with iron oxides and oxalate in aqueous solution. AU - Li,F B, AU - Li,X Z, AU - Li,X M, AU - Liu,T X, AU - Dong,J, Y1 - 2007/04/04/ PY - 2006/11/23/received PY - 2007/03/17/revised PY - 2007/03/21/accepted PY - 2007/4/25/pubmed PY - 2007/9/22/medline PY - 2007/4/25/entrez SP - 481 EP - 90 JF - Journal of colloid and interface science JO - J Colloid Interface Sci VL - 311 IS - 2 N2 - To understand the degradation of endocrine disrupting chemicals (EDCs) with existence of iron oxides and polycarboxylic acids in the natural environment, the photodegradation of bisphenol A (BPA) at the interface of iron oxides under UV illumination was conducted. Four iron oxides were prepared by a hydrothermal process and then sintered at different temperatures of 65, 280, 310, and 420 degrees C named "IO-65," "IO-280," "IO-310," and "IO-420," respectively. The prepared iron oxides were characterized by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) methods. The XRD pattern of IO-65 showed a crystal structure of lepidocrocite (gamma-FeOOH) and that of IO-420 demonstrated a crystal structure of hematite (alpha-Fe(2)O(3)), while IO-280 and IO-310 have the mixed crystal structures of maghemite (gamma-Fe(2)O(3)) and hematite. The BET results revealed that the specific surface areas decreased with the increase of sintering temperature. The results demonstrated that the photodegradation of BPA depends strongly on the properties of iron oxides and oxalate, and pH. The properties of iron oxides influenced strongly the dependence of the BPA degradation on the oxalate concentration. The optimal initial concentrations of oxalate for BPA degradation under UV illumination were determined to be 2.0, 2.0, 2.4, and 2.0 mM for IO-65, IO-280, IO-310, and IO-420, respectively. The first-order kinetic constants k for BPA degradation under UV illumination in the presence of oxalate with the optimal initial concentration are ranked as IO-280>IO-310>IO-65>IO-420. The experiments demonstrated that the optimal pH value should be in the range of 3-4. Furthermore, the dependence of BPA degradation should be also attributable to the formation of the dissolved Fe-oxalate in the solution and the adsorbed Fe-oxalate on the surface of iron oxides, and also the formation of hydrogen peroxide. SN - 0021-9797 UR - https://www.unboundmedicine.com/medline/citation/17451730/Heterogeneous_photodegradation_of_bisphenol_A_with_iron_oxides_and_oxalate_in_aqueous_solution_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0021-9797(07)00362-1 DB - PRIME DP - Unbound Medicine ER -