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Afia L.,University Ibn Zohr | Salghi R.,University Ibn Zohr | Bazzi E.H.,Etablissement Autonome de Controle et de Coordination des Exportations dAgadir | Zarrouk A.,University Mohammed Premier | And 5 more authors.
Research on Chemical Intermediates

Argan hulls extract (AHE) was tested as corrosion inhibitor for mild steel in 1 M HCl. Weight loss measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) revealed that inhibiting action increased with increasing concentration of the inhibitor. The highest efficiency 97.3% was obtained at 5 g/L AHE. There was good agreement between gravimetric and electrochemical methods (potentiodynamic polarization and EIS). Results obtained from EIS measurements were analyzed to model the corrosion-inhibition process by use of the appropriate equivalent circuit model; a constant phase element was used. Polarization measurements show also that AHE acts as good mixed inhibitor. AHE is adsorbed on the steel surface in accordance with a Langmuir isotherm adsorption model. © Springer Science+Business Media B.V. 2012. Source

Errami M.,University Ibn Zohr | Salghi R.,University Ibn Zohr | Zougagh M.,Regional Institute for Applied Science Research | Zarrouk A.,University Mohammed Premier | And 5 more authors.
Research on Chemical Intermediates

Buprofezin (2-tert-butylimino-3-isopropyl-5-phenyl-1,3,5-thiadiazinan-4- one) is identified as a commonly used chemical with satisfactory biological activities against sucking insect pests, but its disposal causes serious environmental problems. This pesticide was treated by an electrolysis system using a boron-doped diamond (BDD) as anode and platinum as cathode. A number of experiments were run on a laboratory scale and the results are presented. The chemical oxygen demand (COD) measurement during the processing permitted the evaluation of the kinetic of organic matter decay and the instantaneous current efficiency. Different operating conditions and factors affecting the treatment process including current density, conductive electrolyte, pH, concentration of buprofezin, and time of electrolysis were studied and optimized. The best obtained conditions for COD removal on the BDD anode to degrade buprofezin solutions (COD0 = 1,200 mg L-1) include operating at 60 mA cm-2 and 25 ± 3 C. The high efficiency of this technology can be explained in terms of the direct electrooxidation at the BDD surface and the oxidation carried out by hydroxyl radicals (OH•) and other electro-generated oxidants (Cl-, ClO-). © 2012 Springer Science+Business Media B.V. Source

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