A metal zinc porphyrin cof material/graphene oxide modified electrode and its preparation and application
A technology for modifying electrodes and zinc porphyrin, which is applied in the field of electrochemical analysis and can solve problems such as detection and separation difficulties
Inactive Publication Date: 2021-01-12
NORTHWEST NORMAL UNIVERSITY
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Problems solved by technology
Because the two not only exist at the same time in the environment, but also because they have similar structures and properties, the electrochemical response ranges of catechol and hydroquinone are very similar, and the oxidation peaks and reduction peaks of the two often overlap. Makes it more difficult to detect and separate catechol and hydroquinone
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[0034] The synthesis and electrochemical detection process of the COF material of the present invention will be further described through specific examples below.
[0035]1. Synthesis of metal zinc porphyrin COF materials
[0036] (1) Dissolve 3.7g of p-nitrobenzaldehyde in a mixed solution of propionic acid and propionic anhydride, heat to reflux at 130°C, and stir mechanically; then slowly add 1.66mL of pyrrole and 3.3mL of propionic acid mixed solution dropwise, and then Reflux for 30 minutes: the product was cooled, filtered and washed with distilled water to obtain a purple-black crude product tetranitrophenylporphyrin. By adding pyridine to reflux, washing and filtering with acetone, some by-products and unreacted raw materials were removed. Take 0.25g of tetranitrophenylporphyrin, 40mL of concentrated hydrochloric acid as a solvent, 1.2g of stannous chloride as a reducing agent, heat and reflux under nitrogen protection to obtain tetraaminophenylporphyrin, filter and w...
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Abstract
The invention provides a synthesis method for a covalent organic framework (COF) taking metalloporphyrin as a structural unit. The COF is applied to electrochemical detection of catechol and hydroquinone. The zinc metalloporphyrin, terephthalaldehyde, o-dichlorobenzene, n-butyl alcohol and acetic acid serve as raw materials and are stirred under the reflux condition to synthesize the COF; and thenthrough centrifugal washing and vacuum drying, the porous COF is obtained. The catechol and the hydroquinone are both the isomeride of benzenediol, are toxic and difficult to biodegrade, and have harm to the environment and human beings. The synthesis method is simple in synthesis technology, mild in reaction condition and low in synthesis cost, the synthesized COF is good in chemical stability,a good electrode material can be built, and the application range of the material is expanded.
Description
technical field [0001] The invention relates to the preparation of a covalent organic framework material COF material / graphene oxide modified electrode, which is mainly used for the rapid detection of hydroquinone and hydroquinone, and belongs to the technical field of electrochemical analysis. Background technique [0002] Covalent Organic Frameworks (COFs) is an organic porous material that has developed rapidly in recent years. It is formed by strong covalent bonds of C, H, N, B, O and other elements. It not only has a high specific surface area of porous materials , low-density characteristics, and has the advantages of structure predictability, pore size controllability, relatively stable structure, good thermal stability and chemical stability. Since Yaghi's group first successfully synthesized COF-1 through boronic acid self-condensation in 2005, COFs have received extensive attention. At the same time, the application of COFs materials in various fields is gradual...
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IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 杨武陈惠琴郭昊薛瑞
Owner NORTHWEST NORMAL UNIVERSITY