Electrocatalytic reduction combined electrode and preparation method and application thereof

A composite electrode, electrocatalysis technology, applied in chemical instruments and methods, reduced water/sewage treatment, water pollutants, etc., can solve the problems of poor conductivity, high specific surface area, hydrophobicity, etc., and achieve enhanced conductivity and high specific surface area. , the effect of improving hydrophilicity

Active Publication Date: 2017-11-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphite felt (GF) is a typical cheap porous, high specific surface area, high temperature and corrosion resistant three-dimensional inorganic carbon material, suitable for the field of electrochemical water treatment, but compared with metal, it has poor conductivity, hydrophobicity, etc. shortcoming

Method used

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  • Electrocatalytic reduction combined electrode and preparation method and application thereof
  • Electrocatalytic reduction combined electrode and preparation method and application thereof
  • Electrocatalytic reduction combined electrode and preparation method and application thereof

Examples

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preparation example Construction

[0031] The preparation method of composite electrode of the present invention comprises the following steps:

[0032] (1) Graphite felt (GF) pretreatment: Graphite felt is ultrasonically washed with acetone and methanol for 20 minutes each to remove surface organic matter, and then washed with distilled water; then immersed in a mixed solution of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 1:1 for 1 hour , for corrosion roughening treatment;

[0033] (2) Preparation of multi-walled carbon nanotube (MWCNTs) suspension: add 0.1-0.5g MWCNTs to a certain concentration of hexadecyltrimethylammonium bromide solution and perform full ultrasound to prepare a reaction solution;

[0034] (3) Preparation of MWCNTs / GF electrode: Take the pretreated GF in step (1) as the cathode, and the titanium plate as the anode, put them into the reaction solution obtained in step (2), and conduct electrodeposition with a current of 5-30mA for 30min. Obtain MWCNTs / GF...

Embodiment 1

[0040] Example 1 (Pd-Ni / MWCNTs / GF electrode)

[0041] (1) Graphite felt (GF) pretreatment: GF was washed with acetone and methanol for 20 minutes to remove surface organic matter, and then washed with distilled water. Then immerse in a mixed solution of concentrated nitric acid and concentrated sulfuric acid with a volume ratio of 1:1 for 1 hour to carry out corrosion roughening treatment;

[0042] (2) Configuration of multi-walled carbon nanotube (MWCNTs) suspension: add 0.1-0.5g MWCNTs to a certain concentration of hexadecyltrimethylammonium bromide solution and perform sufficient ultrasonication to obtain a reaction solution;

[0043] (3) Preparation of MWCNTs / GF electrode: Take the GF treated in step (1) as the cathode, and the titanium plate electrode as the anode, put it into the MWCNTs suspension obtained in step (2), and conduct electrodeposition at 5-30mA for 30min , to get MWCNTs / GF electrode (scanning electron microscope photo see figure 1 ).

[0044] (4) Configura...

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Abstract

The invention discloses an electrocatalytic reduction combined electrode and a preparation method and application thereof. The electrode is characterized in that a graphite felt is taken as a substrate, and a multiwalled carbon nanotube, a nickel metal layer and a palladium metal layer are deposited on the substrate sequentially. The method includes: firstly, preparing the multiwall carbon nanotube / graphite felt electrode; soaking the electrode in a nickel salt solution and forming the nickel metal layer on the surface of the electrode through high-temperature nitrogen reduction; forming the palladium metal layer through direct metal reduction in a palladium salt solution to obtain the nickel-palladium bimetal combined electrode. The combined electrode is high in catalytic activity and good in stability, and nitrobenzenes and chlorphenols in water can be subjected to electrocatalytic treatment rapidly and efficiently.

Description

technical field [0001] The invention relates to a composite electrode used for electrochemical reduction, denitrification and dechlorination of nitrobenzene and chlorophenol pollutants in water, and belongs to the technical field of electrochemical water treatment. Background technique [0002] Nitrobenzene and chlorophenol pollutants exist in industrial wastewater, which are very typical persistent organic pollutants. Biodegradation, toxicity or "three causes" (carcinogenic, teratogenic, mutagenic) effects and other characteristics. Both types of substances contain strong electron-withdrawing groups on the benzene ring, such as nitro and chloro groups. Due to the toxicity and stability of nitrobenzene and chlorophenol pollutants, their residue and accumulation in the environment, and how to reduce or eliminate the pollution and toxicity of these compounds to the environment, people have attracted increasing attention. [0003] At present, the removal methods of nitrobenze...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/70C02F101/34C02F101/36C02F101/38
CPCC02F1/4676C02F2001/46133C02F2101/345C02F2101/36C02F2101/38
Inventor 李爱民吴一凡宋海欧甘玲姜笔存李文涛
Owner NANJING UNIV
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