مقالههای Lida Fotouhi
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
۱Electrochemical Sulfonylation of 4–tert–Butylcatechol in the Presence of N,N'–dimethylamino ethanthiol : Kinetic Study by Digital Simulation of Cyclic Voltammograms
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، اول،شماره۴، Dec ۲۰۰۹، سال ۰
تعداد صفحات: ۸
Electrochemical oxidation of 4–tert–butylcatechols (1) has been studied in the presence of N,N'–dimethylamino ethanthiol (3) as nucleophile in aqueous solution, using cyclic voltammetry and controlled–potential coulometry. The results indicate the quinone derived from the oxidation of 4–tert–butylcatechols (1) participates in a Michael addition reaction with N,N'–dimethylamino ethanthiol (3) to form the corresponding arylsulfonylbenzenediol 4 as the final product. Based on an EC mechanism, the observed homogeneous rate constants of reaction of some catechol derivatives and 3 were estimated by comparison the experimental cyclic voltammograms with the digital simulated results.
۲Voltammetric Response of Furazolidone on Multi–walled Nanotube Film Coated Carbon Paste Electrode Using Ionic Liquid
اطلاعات انتشار: Analytical & Bioanalytical Electrochemistry، پنجم،شماره۳، June ۲۰۱۳، سال ۰
تعداد صفحات: ۸
A film of multiwalled carbon nanotubes (MWCNT) was casted on the surface of an ionic liquid (IL) modified carbon paste electrode (CPE) to established a modified electrode denoted as MWCNT\IL\CPE. The electrochemical reduction of furazolidone (Fu) was investigated with cyclic voltammetry. The constructed electrode (MWCNT\IL\CPE) exhibited excellent electrocatalytic behavior toward the reduction of Fu as evidenced by the enhancement of the reduction peak current and the shift in the cathodic potential to less negative values (by 20 mV) in comparison with the bare CPE. The formal potential, E0', of Fu is pH dependent with a slope of –53.1 mV per unit of pH, close to the anticipated Nernestian value of –59 mV for a 4–electron and 4–proton process. A detailed analysis of cyclic voltammograms gave fundamental electrochemical parameters including the electroactive surface coverage (Г), the transfer coefficient () and the standard rate constant (ks). A linear calibration curve was obtained for Fu detection in the concentration range of 50–800 mol L–1 of detection limit 33 mol L–1.
۳Electrochemical Oxidation of Sulfamethazine on Multi–Walled Nanotube Film Coated Glassy Carbon Electrode
اطلاعات انتشار: Journal of Nano Structures، چهارم،شماره۲، ۲۰۱۴، سال ۰
تعداد صفحات: ۶
The electrochemical oxidation of sulfamethazine (SMZ) has been studied at a multi–walled carbon nanotubes modified glassy carbon electrode (MWCNT–GCE) by cyclic voltammetry. This modified electrode (MWCNT–GCE) exhibited excellent electrocatalytic behavior toward the oxidation of SMZ as evidenced by the enhancement of the oxidation peak current and the shift in the anodic potential to less positive values (170 mV) in comparison with the bare GCE. The formal potential, E0'' , of SMZ is pH dependent with a slope of 54 mV per unit of pH, close to the anticipated Nerstian value of 59 mV for a 2–electron and 2–proton oxidation process. A detailed analysis of cyclic voltammograms gave fundamental electrochemical parameters including the electroactive surface coverage (Г), the transfer coefficient (), the heterogeneous rate constant (ks). Under the selected conditions, the peak current shows two dynamic linear ranges of 10–200 M and 300–3000 Mwith the detection limit of 6.1 M. The method was successfully applied to analyze SMZ in serum sample.
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