Degradation of paracetamol by advance oxidation processes using modified reticulated vitreous carbon electrodes with TiO2 and CuO/TiO2/Al2O3

• Published in: Chemosphere (Oxford) 2012-11, Vol.89 (10), p.1195-1201
• Main Authors: Arredondo Valdez, H.C., García Jiménez, G., Gutiérrez Granados, S., Ponce de León, C.
• Format: Article
• Language: English
• Subjects: Advanced Oxidation Processes (AOPs); Applied sciences; Drinking water and swimming-pool water. Desalination; Electrocatalysis; Exact sciences and technology; General purification processes; Paracetamol; Photocatalysis; Photoelectrocatalysis; Pollution; Reticulated vitreous carbon; Wastewaters; Water treatment and pollution
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2012.07.020

Electrochemical cell used for the degradation of paracetamol in the presence of hydrogen peroxide using photochemical, electrolysis and photoelectrolysis processes with modified reticulated vitreous carbon (RVC) electrodes with TiO2. The degradations followed a pseudo first order reaction kinetics with high percentage of TOC removal (80–99%), current efficiencies of 32–68% and energy consumption of 3.3–11.0kWhL−1. [Display omitted] ► Photochemical, electrochemical and photoelectrochemical degradation of paracetamol. ► Low cost modified reticulated vitreous carbon electrodes coated with TiO2. ► 95% Paracetamol degradation at 68% current efficiency was achieved. ► Performance parameters are comparable with more expensive electrodes. The degradation of paracetamol in aqueous solutions in the presence of hydrogen peroxide was carried out by photochemistry, electrolysis and photoelectrolysis using modified 100 pores per inch reticulated vitreous carbon electrodes. The electrodes were coated with catalysts such as TiO2 and CuO/TiO2/Al2O3 by electrophoresis followed by heat treatment. The results of the electrolysis with bare reticulated vitreous carbon electrodes show that 90% paracetamol degradation occurs in 4h at 1.3V vs. SCE, forming intermediates such as benzoquinone and carboxylic acids followed by their complete mineralisation. When the electrolysis was carried out with the modified electrodes such as TiO2/RVC, 90% degradation was achieved in 2h while with CuO/TiO2/Al2O3/RVC, 98% degradation took only 1h. The degradation was also carried out in the presence of UV reaching 95% degradation with TiO2/RVC/UV and 99% with CuO/TiO2/Al2O3/RVC/UV in 1h. The reactions were followed by spectroscopy UV–Vis, HPLC and total organic carbon analysis. These studies show that the degradation of paracetamol follows a pseudo-first order reaction kinetics.