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Preparation and Analytical Applications of Modified Electrode with Polymer Film

Author: WangChunYan
Tutor: TianJian
School: Changchun University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Chemically modified electrode Electrochemical polymerization Electrocatalysis Poly amido black 10B Poly chrome black T Poly Glutamic Acid
CLC: O657.1
Type: PhD thesis
Year: 2011
Downloads: 150
Quote: 0
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Abstract

Chemically modified electrode (CMEs) by artificially molecular design on the electrode surface, will have excellent chemical properties of molecules, ions and the polymer is fixed on the electrode surface, the electrode having a specific chemical and electrochemical properties, so that, in its upper The desired reaction. CMEs enrich the electrochemical electrode materials, extends the range of applications of electrochemistry, is one of the most active areas of research in electrochemistry and electroanalytical chemistry. The purpose of this study is to develop and perfect CMEs, looking for a new modifier, research new technologies and new ways to explore the application of the polymer film CMEs in the field of analysis, to improve its detection sensitivity and selectivity, the establishment can be applied to actual samples detection technology. The innovation of this study is the use of electrochemical poly legally prepared poly-amino black 10B modified electrode, the modified electrode poly chrome black T and poly-glutamic acid modified electrode and successfully applied to some fast electro-active substances, simple, economic detection. The main content of the research in the following aspects: 1 poly amido black lOB / Nafion modified electrode and the detection of dopamine weak acid dye amido black 10B contain large conjugated aromatic ring through π-π key The effect can be so that a certain degree of physical adsorption, but this process adsorbed less susceptible to environmental effects, it is difficult to control the surface of the glassy carbon electrode. Glassy carbon electrode substrate, electrochemical polymerization method for the first time amido black 10B dye molecules non-covalently modified glassy carbon electrode surface, and then dropping Nafion, prepared the poly amino Black 10B/Nafion modified electrode. The electrode production process is very simple, the modification of the amount of control can be carried out by electrochemical polymerization laps, while having a good stability and reproducibility. SEM and AFM the poly amido black 10B film can be observed closely attached to the surface of a glassy carbon electrode. Experimental modified electrode electrochemical impedance spectroscopy and electrochemical characterization show that electron transfer faster speed and greater effective surface area of ??the electrical activity of the modified electrode. The modified electrode not only good electrocatalytic activity of dopamine, and effectively eliminate the interference of ascorbic acid, improved selectivity. The electrode can be used for the determination of dopamine hydrochloride injection and calf serum dopamine, provide a new method for the determination of Pharmacy in dopamine. Poly-amino black 10B detect vitamin B6 modified glassy carbon electrode modified amido black 10B dye molecules to the surface of the glassy carbon electrode electrochemical polymerization method, prepared poly amido black 10B modified electrode stability and reproducibility better overcome the The carbon electrode is exposed to the surface of sensitive defects. Chronocoulometry experimental results show that the modified electrode is reverse reaction can be in the instant reaction is completed, the electronic exchange rate of the redox reaction of the surface of the electrode and membrane and the bare electrode are quickly. The modified electrode Electrocatalysis oxidation of vitamin B6. Differential pulse voltammetry and amperometric detection technology vitamin B6, wide linear range, low detection limit (5.0 × 10-8 mol / L), lower than the other methods have been reported. Moreover, the modified electrode has the advantages of simple preparation, fast response, stability, and good reproducibility. The electrodes used in the determination of the concentration of vitamin B6 in pharmaceutical preparations, to obtain satisfactory results. Poly amido black 10B modified electrode may be used in the field of drug analysis. Poly chrome black T modified electrode detection nitrite chrome black T is a common acid-base indicator, its molecules containing the multiple conjugated system may play the role of mediator, but this material as the electrode modifier study reported rarely. Using electrochemical polymerization chrome black T-modified glassy carbon electrode surface to get poly chrome black T modified electrode. Chrome black T on a glassy carbon electrode electrochemical polymerization process is radical initiator electrochemical polymerization process. The poly chrome black T modified electrode nitrite restore strong electric catalysis, catalysis is mainly due to the poly chrome black T film electrostatic interactions with the negatively charged nitrite ion, resulting in nitrite ions are enriched in the surface of the electrode / solution interface, thereby improving the detection sensitivity. By optimizing the experimental parameters of the electrochemical response of nitrite, the modified electrode can be used for the amperometric detection of nitrite, the linear range spanning six orders of magnitude, the detection limit of 1.0 × 10-8 mol / L. At the same time, the modified electrode preparation, good reproducibility and stability, can be used continuously for two weeks while the signal is no significant decrease. The modified electrode for kimchi determination of nitrite to obtain satisfactory results. Poly glutamic acid modified electrode and the simultaneous detection of poly glutamic acid modified glassy carbon electrode was prepared by electrochemical polymerization of hydroquinone and catechol. AFM results show that polyglutamic acid on a glassy carbon electrode surface similar to the nano-fibrous form of existence, multiple poly glutamate chain cohesion showing the polymeric network structure, this structure is conducive to the test substance and the polymer membrane with opposite charge ionic interactions. The modified electrode electrochemical oxidation of hydroquinone and catechol reduction shows a high catalytic ability to significantly reduce both the oxidation potential to improve the electrochemical reversibility of the two, while enhancing both redox peak current. Using cyclic voltammetry and differential pulse voltammetry, while detection of hydroquinone and catechol, and has high sensitivity. In addition, we will poly glutamic acid modified electrode used for the determination of hydroquinone and catechol in the actual wastewater to obtain a satisfactory result, the potential value.

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