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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 (DRX). The acetaminophen degradation was determined by high-performance liquid chromatography (HPLC) and total organic carbon (TOC). The reaction behavior was studied under the Langmuir–Hinshelwood (LH-HW) equation 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.

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An electrochemical study for the copper electrodeposition on nanostructured carbon black films electrodes supported in glassy carbon (GC) is presented, using the cyclic voltammetry of reversal potential (Eλ), chronoamperometry, chronocoulometry and chronopotentiometry techniques in the electrolytic system 10-3M CuCl2;1M NH4OH, 1M KCl, pH =10. The cyclic voltammetry studies allow characterizing the potential range by copper electrodeposition in two steps: Cu(II) to Cu(I) and Cu(I) to Cu(0). A Chronocoulometry study shows an important adsorption process of chlorine ions, couple to the copper deposit. The quantity of monolayer and atoms of metallic copper, were evaluated by chronopotentiometry studies.