Photocatalytically-assisted electrochemical degradation ofp-aminophenol in aqueous solutions using zeolite-supported TiO2catalyst
✍ Scribed by Cornelia Ratiu; Florica Manea; Carmen Lazau; Corina Orha; Georgeta Burtica; Ioan Grozescu; Joop Schoonman
- Book ID
- 111491449
- Publisher
- Versita
- Year
- 2011
- Tongue
- English
- Weight
- 455 KB
- Volume
- 65
- Category
- Article
- ISSN
- 0366-6352
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✦ Synopsis
Abstract
This paper reports the results of an investigation into enhancement of the electrochemical oxidation of p-aminophenol (4-AP) in an aqueous solution with a boron-doped diamond (BDD) electrode, assisted by photocatalysis using a zeolite-supported TiO2 (Z-TiO2) catalyst. The BDD electrode was characterised in 0.1 M Na2SO4-supporting electrolyte and the presence of 4-AP by open-circuit potential behaviour (OCP) and cyclic voltammetry (CV). The electrode behaviour was investigated in the dark and following UV irradiation and in the absence/presence of the Z-TiO2 catalyst. The electro-oxidation process was carried out using chronoamperometry (CA) and multiple-pulsed amperometry (MPA) at the selected potential under potentiostatic conditions. The electrochemical degradation process of 4-AP on the BDD electrode was improved by the application of a pulsed potential, which allowed both in-situ electrochemical cleaning of the electrode and indirect oxidation of 4-AP by oxygen evolution. The application of photocatalysis using Z-TiO2 in the 4-AP electrochemical degradation exhibited an enhanced effect when the anodic potential was set at +1.25 V vs. Ag/AgCl in the water stability region, close to the oxygen evolution potential.