AUTHOR=Aguilar Claudia A. , de la Cruz Alberto , Montalvo Carlos , Ruiz-Marín Alejandro , Oros-Ruiz Socorro , Figueroa-Ramírez Sandra J. , Abatal Mohamed , Anguebes Francisco , Córdova-Quiroz Victor 

TITLE=Effect of kinetics on the photocatalytic degradation of acetaminophen and the distribution of major intermediate with anatase-Ag synthesized by sol gel under visible irradiation

JOURNAL=Frontiers in Environmental Science

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2022.943776

DOI=10.3389/fenvs.2022.943776

ISSN=2296-665X

ABSTRACT=The degradation of acetaminophen (ACET) was studied with TiO2-Ag catalysts, whose predominant crystalline phase was anatase synthesized by the Sol-Gel method and doped by photo-deposition under UV radiation with silver particles. The catalyst was characterized by energy dispersive X-ray fluorescence (EDXRF) and X-ray diffraction (XRD). The acetaminophen degradation was determined by high performance liquid chromatography (HPLC) and total organic carbon (TOC). The reaction behavior was studied under the Langmiur-Hinshelwood (LH-HW) kinetic model and in a TOC-based model. With the experimental data, mass balances were performed to introduce the constants (reaction and adsorption kinetics) to the LH-HW equation. With the analysis of the generation and consumption behavior of the organic intermediate compounds (OI), coupled differential equations were generated; which express the degradation and formation-consumption behavior. The kinetic constants were obtained by nonlinear regression using the Levenberg-Marquardt equation. The results show high removal percentages, and the behavior of the experimental data is assumed to fit the LH-HW equation. The analysis of the organic intermediates by solid phase micro-extraction (SPE), HPLC and gas chromatography (CG-MS); shows that the transformation is feasible under the formation of nitro-aromatic derivatives and hydroxylated species.