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El-Desoky H.S.,Analytical and Electrochemistry Research Unit | Ghoneim M.M.,Analytical and Electrochemistry Research Unit | El-Sheikh R.,Zagazig University | Zidan N.M.,Analytical and Electrochemistry Research Unit
Journal of Hazardous Materials

The indirect electrochemical removal of pollutants from effluents has become an attractive method in recent years. Removal (decolorization and mineralization) of Levafix Blue CA and Levafix Red CA reactive azo-dyes from aqueous media by electro-generated Fenton's reagent (Fe2+/H2O2) using a reticulated vitreous carbon cathode and a platinum gauze anode was optimized. Progress of oxidation (decolorization and mineralization) of the investigated azo-dyes with time of electro-Fenton's reaction was monitored by UV-visible absorbance measurements, Chemical oxygen demand (COD) removal and HPLC analysis. The results indicated that the electro-Fenton's oxidation system is efficient for treatment of such types of reactive dyes. Oxidation of each of the investigated azo-dyes by electro-generated Fenton's reagent up to complete decolorization and approximately 90-95% mineralization was achieved. Moreover, the optimized electro-Fenton's oxidation was successfully applied for complete decolorization and approximately 85-90% mineralization of both azo-dyes in real industrial wastewater samples collected from textile dyeing house at El-Mahalla El-Kobra, Egypt. © 2009 Elsevier B.V. All rights reserved. Source

Abdel-Galeil M.M.,Analytical and Electrochemistry Research Unit | Abdel-Galeil M.M.,Toyohashi University of Technology | Ghoneim M.M.,Analytical and Electrochemistry Research Unit | El-Desoky H.S.,Analytical and Electrochemistry Research Unit | And 2 more authors.
Journal of the Electrochemical Society

The voltammetric behavior of Ciprofloxacin (CIP) was investigated in different buffer solutions using cyclic voltammetry. It exhibited a single irreversible anodic peak with shift in peak potential with pH value which indicates proton dependent reaction. In a pH 4.0 phthalate buffer, a poorly defined oxidation peak current (ip) is observed using carbon paste (CP) electrode for the determination of CIP using linear sweep adsorptive stripping voltammetric method (LS-AdASV). However, in the presence of low concentration of Cetyltrimethylammonium bromide (CTAB), ip enhancement occurs. Moreover, the usage of mesoporous carbon-modified carbon paste (MC/CP) electrode exhibits a significant enhancement in the ip. The enhancement of the ip of CIP at MC/CP electrode in the presence of CTAB [1.0 × 10-4 M], was ascribed to two factors: (1) CTAB facilitates electron transfer of CIP; and (2) the high surface area of MC, which accumulates adsorptive CIP on the MC/CP electrode surface. All experimental parameters, were optimized for the determination of CIP. LS-AdASV method is observed to possess the following good qualities: high sensitivity (detection limit is 1.5 × 10-9 M), wide linearity (5.0 × 10-9-2.0 × 10-5 M), rapid response, low cost and simplicity. In conclusion, this method was employed to successfully detect CIP in pharmaceutical formulation and human serum. © 2015 The Electrochemical Society. Source

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