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Direct Electrochemistry and Its Application for Catalysis Reactions of Chloroperoxidase at GC Modified with SWNTs

Author: ZhangHongXia
Tutor: WuXiaQin
School: Shanghai Normal University
Course: Physical and chemical
Keywords: Carbon nanotubes Chloroperoxidase Myoglobin Modified electrode Direct electron transfer Electrocatalysis
CLC: O646.54
Type: Master's thesis
Year: 2009
Downloads: 86
Quote: 0
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Abstract


Carbon nanotubes (CNTs) in recent years in the field of electrochemical biosensors wider application of a nano material , many biological enzyme in the direct electrochemical behavior of CNTs modified electrode shows . Of carbon nanotubes with a mixed acid treatment, can be obtained having a large specific surface area and containing a rich functional group functionalized carbon nanotubes . The research work single-walled carbon nanotubes (SWNTs) as electrodes modified material . Choose Nafion was used as the dispersing agent of SWNTs in comparative experiments . The the SWNTs dispersion liquid and Mb solution after mixing dropped onto glassy carbon (GC) electrode surface is made too Mb- the SWNTs -Nafion / GC modified electrode . A quasi-reversible redox peaks appeared on the cyclic voltammograms of the modified electrode carbon nanotube promote Mb passed directly on the electrode surface electronic . Different scan rate cyclic voltammetry characterization results indicate that , Mb modified electrode electron transfer reaction is controlled by surface adsorption process ; fixed Mb modified electrode electric oxygen reduction catalysis . The modified electrode producing simple , stable performance . The method of application of fixed Mb CPO will be fixed to the GC electrode surface , CV measurement results show that fixed the SWNTs modified electron transfer process between the CPO and electrode on the electrode is quasi-reversible electrode reaction is controlled by surface adsorption , the pH of the solution with E0 ' into good linear relationship between a straight line , the slope of - 49.2 mV / pH , that is manifested as an electron- proton reaction . This study attempts CPO-SWNTs-Nafion/GC modified electrodes used in catalytic MCD chlorination . UV spectra track test results show that the CPO fixed in SWNTs-Nafion/GC electrode surface can be a good catalytic MCD DCD, the total conversion compared to the prior reported in the literature . However , experimental process CPO there is still the problem of enzyme deactivation . Combination of this research team other students research work and have been reported in the literature , one of the reasons discussed initially generated in the process is the reaction of hydrogen peroxide is not the time to participate in the reaction or timely diffusion , resulting in the local vicinity of the electrode surface H2O2 concentration is too high , resulting in a fixed part of the surface of the electrode CPO inactivation .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical > Electrolysis and Electrode role > Electrode process
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