Photocatalytic degradation of Bisphenol A: Kinetic studies and determination of the reaction pathway

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Luis F. Garay Rodríguez
Brenda Zermeño
Karla Alejandra López de la O
Elisa Leyva
Edgar Moctezuma

Abstract

The photocatalytic degradation of BPA aqueous solutions with commercial TiO2 (Evonik P25) was carried out in a home-made batch reactor illuminated with four UV lamps (λmax= 365 nm) in order to determine the kinetic parameters of the reaction rate equation and to identify and quantify some of the most stable aromatic intermediate reaction products. Low concentration (20 ppm) BPA solutions were completely degraded and mineralized in less than three hours of reaction. Whereas, BPA aqueous solutions with concentration above 50 ppm are transformed in other chemical compounds in 6 hours of reaction and fully mineralized in 15 hours of reaction. Kinetic analysis of the experimental results of BPA concentration as a function of time indicated that this photocatalytic degradation process follows a LH-HW reaction rate law where the reaction order shift from zero order to first order as the reactant concentration is decreased. Analysis of the reaction samples by different analytical techniques indicated that BPA is mineralized via formation of hydroquinone, benzoquinone, benzene-triol, catechol, and phenol by two simultaneous reaction pathways.

 

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How to Cite
Rodríguez, L. F., Zermeño, B., de la O, K. A., Leyva, E., & Moctezuma, E. (2019). Photocatalytic degradation of Bisphenol A: Kinetic studies and determination of the reaction pathway. Journal of Applied Research and Technology, 16(5). https://doi.org/10.22201/icat.16656423.2018.16.5.737
Author Biographies

Luis F. Garay Rodríguez

Universidad Autónoma de Nuevo León, Facultad de Ingeniería Civil-Departamento de Ecomateriales y Energía, Av. Universidad S/N Cd. Universitaria, San Nicolás de los Garza, N. L., México 66455

Brenda Zermeño

Universidad Autónoma de San Luis Potosí, Facultad de Ciencias Químicas, Av. Manuel Nava # 6, San Luis Potosí, S.L.P., México 78210

Karla Alejandra López de la O

Universidad Autónoma de San Luis Potosí, Facultad de Ciencias Químicas, Av. Manuel Nava # 6, San Luis Potosí, S.L.P., México 78210

Elisa Leyva

Universidad Autónoma de San Luis Potosí, Facultad de Ciencias Químicas, Av. Manuel Nava # 6, San Luis Potosí, S.L.P., México 78210

Edgar Moctezuma

Universidad Autónoma de San Luis Potosí, Facultad de Ciencias Químicas, Av. Manuel Nava # 6, San Luis Potosí, S.L.P., México 78210