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Dependence of bisphenol A photodegradation on the initial concentration of oxalate in the lepidocrocite-oxalate complex system.
J Environ Sci (China). 2006; 18(4):777-82.JE

Abstract

To understand the degradation of endocrine disrupting chemicals (EDCs) in natural environment with existence of iron oxides and carboxylic acids, the dependence of bisphenol A (BPA) photodegradation on the initial concentration of oxalate (COX) in lepidocrocite (gamma-FeOOH) aqueous suspension was investigated under both UV and visible lights in this study. Lepidocrocite powder was home-prepared by a hydrothermal process. It was found that BPA degradation was promoted greatly in the presence of oxalate owing to the formation of lepidocrocite-oxalate complex. And there was an optimal COX, which was 2.0 and 2.4 mmol/L, under UV and visible lights, respectively. The first-order kinetic constant, k value increased 38 times from 0.17 x 10(-2) min(-1) in the absence of oxalate to 6.39 x 10(-2) min(-1) in the presence of oxalate with an optimal COX (2.0 mmol/L) under UV irradiation, and almost 306 times from 0.02 x 10(-2) min(-1) in the absence of oxalate to 6.11 x 10(-2) min(-1) in the presence of oxalate with an optimal COX (2.4 mmol/L) under visible irradiation. The BPA degradation rate increased and the first-order kinetic constants decreased with the increase in BPA initial concentration. The dependence of the variation of pH value, total-Fe and Fe2+ during the photoreaction on COX was also investigated. The pH value increased obviously with the reaction time. Total-Fe increased dramatically at the first 5 min and then decreased quickly under UV irradiation and slowly under visible irradiation. The initial concentration of oxalate is a main factor to affect BPA photodegradation in aqueous suspension under both UV and visible lights.

Authors+Show Affiliations

School of Life Science, Sun Yat-sen University, Guangzhou, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17078560

Citation

Dong, Jun, et al. "Dependence of Bisphenol a Photodegradation On the Initial Concentration of Oxalate in the Lepidocrocite-oxalate Complex System." Journal of Environmental Sciences (China), vol. 18, no. 4, 2006, pp. 777-82.
Dong J, Li FB, Lan CY, et al. Dependence of bisphenol A photodegradation on the initial concentration of oxalate in the lepidocrocite-oxalate complex system. J Environ Sci (China). 2006;18(4):777-82.
Dong, J., Li, F. B., Lan, C. Y., Liu, C. S., Li, X. M., & Luan, T. G. (2006). Dependence of bisphenol A photodegradation on the initial concentration of oxalate in the lepidocrocite-oxalate complex system. Journal of Environmental Sciences (China), 18(4), 777-82.
Dong J, et al. Dependence of Bisphenol a Photodegradation On the Initial Concentration of Oxalate in the Lepidocrocite-oxalate Complex System. J Environ Sci (China). 2006;18(4):777-82. PubMed PMID: 17078560.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dependence of bisphenol A photodegradation on the initial concentration of oxalate in the lepidocrocite-oxalate complex system. AU - Dong,Jun, AU - Li,Fang-bai, AU - Lan,Chong-yu, AU - Liu,Cheng-shuai, AU - Li,Xiao-min, AU - Luan,Tian-gang, PY - 2006/11/3/pubmed PY - 2007/1/17/medline PY - 2006/11/3/entrez SP - 777 EP - 82 JF - Journal of environmental sciences (China) JO - J Environ Sci (China) VL - 18 IS - 4 N2 - To understand the degradation of endocrine disrupting chemicals (EDCs) in natural environment with existence of iron oxides and carboxylic acids, the dependence of bisphenol A (BPA) photodegradation on the initial concentration of oxalate (COX) in lepidocrocite (gamma-FeOOH) aqueous suspension was investigated under both UV and visible lights in this study. Lepidocrocite powder was home-prepared by a hydrothermal process. It was found that BPA degradation was promoted greatly in the presence of oxalate owing to the formation of lepidocrocite-oxalate complex. And there was an optimal COX, which was 2.0 and 2.4 mmol/L, under UV and visible lights, respectively. The first-order kinetic constant, k value increased 38 times from 0.17 x 10(-2) min(-1) in the absence of oxalate to 6.39 x 10(-2) min(-1) in the presence of oxalate with an optimal COX (2.0 mmol/L) under UV irradiation, and almost 306 times from 0.02 x 10(-2) min(-1) in the absence of oxalate to 6.11 x 10(-2) min(-1) in the presence of oxalate with an optimal COX (2.4 mmol/L) under visible irradiation. The BPA degradation rate increased and the first-order kinetic constants decreased with the increase in BPA initial concentration. The dependence of the variation of pH value, total-Fe and Fe2+ during the photoreaction on COX was also investigated. The pH value increased obviously with the reaction time. Total-Fe increased dramatically at the first 5 min and then decreased quickly under UV irradiation and slowly under visible irradiation. The initial concentration of oxalate is a main factor to affect BPA photodegradation in aqueous suspension under both UV and visible lights. SN - 1001-0742 UR - https://www.unboundmedicine.com/medline/citation/17078560/Dependence_of_bisphenol_A_photodegradation_on_the_initial_concentration_of_oxalate_in_the_lepidocrocite_oxalate_complex_system_ L2 - https://antibodies.cancer.gov/detail/CPTC-PTGS2-1 DB - PRIME DP - Unbound Medicine ER -