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   electrocatalytic oxidation of cefixime at the surface of modified carbon paste electrode with synthesized nano zeolite  
نویسنده abrishamkar maryam ,ehsani tilami salma ,hosseini kaldozakh sepideh
منبع advanced journal of chemistry-section a - 2020 - دوره : 3 - شماره : 6 - صفحه:767 -776
چکیده    the aim of the present study was to determine the cefixime (cfx) through highly sensitive and simple electrocatalytic method. the electrocatalytic oxidation of cfx was performed on the surface of the modified carbon paste electrode (mcpe) with synthesized nano-sized zsm-5 zeolite using the cyclic chronoamperometry and voltammetry methods. also this work probed the application of the nano-zeolite in electrode structure and prepare zeolite mcpe. due to the porous structure of the zeolite framework, the nickel (ni) (ii) ions were embedded into the zeolite framework through the immersing mcpe with synthesized zeolite in a 1.0 m ni chloride solution. an excellent redox activity was practically seen for the ni^2+/ ni^3+ couple on the mcpe surface in alkaline solution. the ni ions were acted as a mediator for the oxidation of cfx and catalyzed the electron transfer in this process. the cfx molecules were successfully oxidized on the surface of proposed electrode. the chronoamperometric method was used and catalytic reaction rate constant (k) was 3.5 ×10^6 cm^3/s^-1/mol^-1 for the cfx oxidation. this electrocatalytic oxidation had a good linear response in the cfx concentration range of 25×10^-6– 25×10^−5 m with a regression correlation coefficient of 0.993, and the detection limit (3δ) of the method was 26×10^-7 m. the diffusion coefficient of cfx molecules (d=6.47×10^-5 cm^2/s^-1) was calculated based on the chronoamperometry studies.
کلیدواژه electrocatalyst ,nano-zsm5 ,cyclicvoltammetry ,chronoamperometry ,cefixime ,zeolite surface
آدرس islamic azad university, ahvaz branch, department of chemistry, iran, farhangian university, department of basic science, iran, islamic azad university, khuzestan science and research branch, department of chemistry, iran
پست الکترونیکی maryam-abrishamkar@iauahvaz.ac.ir

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