چكيده فارسي :
The natural clinoptilolite nanoparticles were produced through the mechanical planetary ball mill method and the Magnesium ion was entered into the clinoptilolite nanoparticles by ion exchange process and the Mn-exchanged zeolite was used for construction a modified carbon paste electrode[1,2]. Then the electrochemical behavior of modified carbon paste electrode is investigated by cyclic voltammetry technique[3,4].Voltammetric behavior of Mn(II)-NClin/CPE in 0.1 M NaOH solution with well defined anodic (Epa = 0.15 V) and cathodic peaks (Epc = -0.42 V, while no anodic and cathodic peaks were observed in cyclic voltammograms of NClin/CPE[5]. The observed redox behavior for Mn(II)-NClin/CPE can be related to Mn(OH)2/MnOOH redox couple according to the flowing reactions:Cyclic voltammetry responses of different modified electrodes containing 20, 30 and 40% of Mn(II)-NClin (w/w, with respect to carbon paste) were examined in 0.1 M NaOH solution containing 0.5 M methanol. The maximum electrocatalytic current of methanol was observed for the electrode containing 30% Mn(II)-NClin. All cyclic voltammograms recorded in 0.1 M NaOH solution containing 0.5 M of methanol at scan rate of 25 mVs_1.The results also confirmed that strong basic media is essential for the electrooxidation of methanol, so NaNO3 and NH4OH supporting electrolytes were unsuitable supporting electrolytes for the oxidation of methanol. Also, the catalytic rate constant was obtained as 331 M_1s_1 by chronoamperometry which is compa-rable with other electro-catalysts for methanol.
