An experimental and modelling study of the electrochemical oxidation of pharmaceuticals using a boron-doped diamond anode

Abstract

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr An experimental and modelling study of the electrochemical oxidation of pharmaceuticals using a boron-doped diamond anode Yandi Lan, Clémence Coetsier, Christel Causserand, Karine Groenen Serrano A B S T R A C TThis paper deals with an experimental and modelling study on the electrochemical oxidation of refractory pharmaceuticals using a boron-doped diamond (BDD) anode. Different parameters have been investigated, such as the role of salts (sulfates), the presence of other organics, and the influence of applied current intensity. Ciprofloxacin (CIP), Sulfamethoxazole (SMX) and Salbutamol (SALBU) were used for models of pharmaceuticals, and urea as a model for a common organic. The complete removal of pharmaceuticals was observed in all electrolyses under galvanostatic conditions. The presence of common organic waste or other pharmaceutical has no significant impact on the degradation of the CIP target molecule. A mathematical model predicting the temporal concentration variation of organics with electroxidation time has been developed. In this model, different oxidation pathways have been considered: the transfer of electrons (direct oxidation) or of oxygen atoms via the reaction with either hydroxyl radicals or/and with strong electrogenerated oxidants. Excellent correlation with experiments is obtained under all experimental conditions.

On the Role of the Cathode for the Electro-Oxidation of Perfluorooctanoic Acid

“…Electrodes present a 63 cm 2 active surface and the gap between them was set at 10 mm. A detailed scheme of the experimental set-up can be found elsewhere [42]. All experiences were performed with a BDD anode from Adamant Technologies (La Chaux-de-Fonds, Switzerland), which was elaborated by chemical vapor deposition on a conductive substrate of Si.…”

Recent advances in electrocatalysts for halogenated organic pollutant degradation

“…In addition, many studies underscore the importance of the water matrix on the EOD process with BDD anodes. [129][130][131] Naturally, waters contain various organic and inorganic, non-target components. These constituents may interact with the oxidizing radicals and the target pollutants.…”

Rapid uptake of pharmaceutical salbutamol from aqueous solutions with anionic cellulose nanofibrils: The importance of pH and colloidal stability in the interaction with ionizable pollutants

“…So far, the removal methods of salbutamol have been focused on oxidation [12,13] and photodegradation [14][15][16][17][18][19] techniques. Despite being effective in degrading contaminants, oxidation processes typically generate intermediates and oxidation products whose stability and toxicity can be higher than that of the micropollutant itself [15].…”