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Open AccessArticle

Removal of Nonylphenol Polyethylene Glycol (NPEG) with Au-TiO2 Catalysts: Kinetic and Initial Transformation Path

Facultad de Química, Universidad Autónoma del Carmen, Calle 56 No. 4 Av. Concordia, Ciudad del Carmen 24180, Campeche, Mexico
Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava No.6, Zona Universitaria, San Luis Potosí 78210, S.L.P., Mexico
Facultad de Ingeniería, Universidad Autónoma del Carmen, Avenida Central S/N, Mundo Maya, Ciudad del Carmen 24115, Campeche, Mexico
Author to whom correspondence should be addressed.
Catalysts 2020, 10(10), 1205;
Received: 14 August 2020 / Revised: 7 October 2020 / Accepted: 10 October 2020 / Published: 17 October 2020
(This article belongs to the Special Issue Environmental Catalysis in Advanced Oxidation Processes)
The purpose of this study was to evaluate the efficiency of the Au-TiO2 catalyst in the degradation of nonylphenol polyethylene glycol (NPEG). In the first part of the study, the catalyst was synthesized and characterized. Initially, the catalyst (TiO2 Degussa P-25) was doped with gold precursor salts (HAuCl4) at different concentrations (5, 10, and 15%) and the photodeposition method with UV light. It was determined by diffuse reflectance (DF) and scanning electron microscopy (SEM) that the photodeposition method was effective for the inclusion of gold particles on the surface. The catalyst band gap showed a reduction to 2.9 e.v (compared to TiO2 Degussa P-25), and it was observed that the gold-doped catalyst showed absorption in the visible light range 500 to 600 nm. The percentage of deposited gold was determined by energy dispersive spectroscopy (EDS). In the second part of the study, various NPEG degradation experiments were performed; with the catalyst that showed the best conversion percentages of NPEG, the experimental data were analyzed using UV-Vis spectrophotometry and TOC (total organic carbon). With these results, a carbon-based mass balance and reaction kinetics were generated using the Langmuir–Hinshelwood (L–H) heterogeneous catalysis model. For the estimation of the kinetic constants, the non-linear regression of the Levenger–Marquardt algorithm was used. With these results, kinetic models of the degradation of the molecule and the generation and consumption of organic intermediate products (OIPs) were generated. View Full-Text
Keywords: photocatalytic degradation; ethoxylated alkylphenols; gold titanium catalyst photocatalytic degradation; ethoxylated alkylphenols; gold titanium catalyst
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Aguilar, C.; Garcia, M.; Montalvo, C.; Anguebes, F.; Moctezuma, E.; Abatal, M.; Figueroa, S. Removal of Nonylphenol Polyethylene Glycol (NPEG) with Au-TiO2 Catalysts: Kinetic and Initial Transformation Path. Catalysts 2020, 10, 1205.

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