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Preparation method and application of polypyrrole-multiwalled carbon nanotube collaboratively-modified palladium-carried composite electrode

A technology of multi-walled carbon nanotubes and composite electrodes, which is applied in chemical instruments and methods, coating of superimposed layers, electrolytic organic material coating, etc., can solve the problems of low catalytic activity, easy separation of catalyst and matrix, and unstable matrix. , to achieve the effect of high catalytic activity, accelerated dechlorination reaction rate and good stability

Active Publication Date: 2013-10-09
BEIJING UNIV OF TECH
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Problems solved by technology

The present invention aims at dechlorination by electrocatalytic reduction, and prepares a composite electrode with large specific surface area and high catalytic reduction activity, which is used for electrocatalytic reduction of chlorophenol, and can improve the instability of the matrix existing in the modified electrode for dechlorination , Catalysts and substrates are easy to detach, low catalytic activity and other shortcomings, creative

Method used

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  • Preparation method and application of polypyrrole-multiwalled carbon nanotube collaboratively-modified palladium-carried composite electrode
  • Preparation method and application of polypyrrole-multiwalled carbon nanotube collaboratively-modified palladium-carried composite electrode
  • Preparation method and application of polypyrrole-multiwalled carbon nanotube collaboratively-modified palladium-carried composite electrode

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Embodiment 1

[0032] 1. Palladium chloride (PdCl 2 ) solution preparation: PdCl 2 Dissolve the powder in hydrochloric acid to prepare 33.8mmol / L of PdCl 2 solution.

[0033] 2. Pretreatment of titanium (Ti) mesh substrate: Soak Ti mesh in 0.3mol / L sodium carbonate solution for 30 minutes, boiled 0.1mol / L oxalic acid solution for 30 minutes, rinse with double distilled water until neutral and set aside.

[0034] 3. Pretreatment of MWCNTs: Take multi-walled carbon nanotubes (MWCNTs) with a diameter of 15-20nm and put them into a sufficient amount of concentrated nitric acid. After ultrasonication for 4 hours, dilute with double distilled water, rinse and filter repeatedly until neutral spare.

[0035] 4. Add 5 mg of MWCNTs pretreated in step 3 into 10 mL of acetone, and sonicate for 30 minutes to form a suspension of MWCNTs.

[0036] 5. Take the pretreated Ti mesh with a clean surface, put it into the MWCNTs suspension obtained in step 3 and soak for 20 minutes, then pull out the suspension...

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Abstract

The invention relates to a preparation method and an application of a polypyrrole-multiwalled carbon nanotube collaboratively-modified palladium-carried composite electrode and belongs to the technical field of electrochemical water treatment. The method comprises the following steps of: firstly ultrasonically dispersing carbon nanotubes after being pretreated into a volatile organic solvent to form carbon nanotube suspension liquid, soaking and lifting a Ti (titanium) net in the suspension liquid, and naturally drying the Ti net to ensure that the carbon nanotubes are dispersed on the surface of the Ti net; carrying out the electrochemical oxidization polymerization in a Py (polypyrrole) sulfuric acid solution to form polypyrrole, so as to obtain a polypyrrole-multiwalled nanotube modified membrane; finally electrically depositing Pd (palladium) in a PdCl2 solution to obtain the polypyrrole-multiwalled carbon nanotube-modified Pd-carried composite electrode. The electrode is used for electrically catalyzing and reducing chloride of chlorophenol in the water. Compared with a Pd / Ti electrode with no modified layer, the research shows that the electrode can rapidly and high-efficiently remove 2, 4-dichlorophen and pentachlorophenol and has universality. The prepared electrode is high in catalytic activity, good in stability, rapid and high-efficient for electrically catalyzing the chlorophenol in the water and promising in application prospect.

Description

technical field [0001] The invention relates to a method for preparing a composite electrode for electrocatalytic reduction and dechlorination of chlorophenols in water. Polypyrrole-multi-wall carbon nanotube synergistic modification is used to improve the catalytic activity and stability of the electrode, which belongs to the electrochemical water treatment technology field. Background technique [0002] Chlorophenol pollutants are a typical class of persistent organic pollutants, which can be used as raw materials or intermediates for dyes, pesticides and organic synthesis; the World Health Organization officially recognizes 2,4,6-trichlorophenol, 2,4, 5-trichlorophenol, pentachlorophenol, etc. are suspected carcinogenic compounds. Most chlorophenols are highly toxic, difficult to biodegrade, have "three causes" (carcinogenic, teratogenic, mutagenic) effects and genotoxicity, remain in the environment for a long time, have a long degradation cycle, and are difficult to re...

Claims

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Application Information

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IPC IPC(8): C23C28/00C25D9/02C23C24/00C02F1/461C02F1/58C02F101/36
Inventor 孙治荣魏学锋沈海涛
Owner BEIJING UNIV OF TECH
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