Pd/MnO2-Ni electrode as well as preparation method and application thereof

An electrode and reaction technology, applied in the field of electrochemistry, can solve the problems of high price of active component metal Pd, etc., achieve the effects of reducing preparation cost and use cost, mild conditions, and activity improvement

Active Publication Date: 2020-01-21
CHONGQING TECH & BUSINESS UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrocatalytic hydrogenation-reductive dechlorination has the following advantages: 1) Continuously provide electrons to ensure continuous and efficient reaction; 2) Control the voltage to adjust the reaction kinetics and path, which has a wide range of applications; 3) No additional chemical substances are required, no Secondary pollution, mild reaction conditions, and environmental friendliness make the electrocatalytic hydrogenation reduction dechlorination technology a promising "environmentally friendly" technology, but its active component metal Pd is expensive

Method used

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  • Pd/MnO2-Ni electrode as well as preparation method and application thereof
  • Pd/MnO2-Ni electrode as well as preparation method and application thereof
  • Pd/MnO2-Ni electrode as well as preparation method and application thereof

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Effect test

Embodiment 1

[0032] Embodiment 1: Preparation of Pd / MnO 2 -Ni electrode

[0033] (1) Weigh 250mg of potassium permanganate, disperse it in 50mL of deionized water, put it into an ultrasonic cleaner and ultrasonically homogenize it, then transfer it to a constant temperature magnetic stirrer for stirring;

[0034] (2) Cut porous nickel foam of 4*3cm, immerse in 30mL hydrochloric acid, put it into an ultrasonic cleaner for ultrasonic cleaning for 3 minutes, then take it out and rinse it with deionized water until the eluate is neutral;

[0035] (3) The porous nickel foam obtained in step (2) is transferred to a tetrafluoroethylene hydrothermal kettle with a volume of 100mL, then the solution obtained in step (1) is slowly added to the polytetrafluoroethylene hydrothermal kettle, and finally the hydrothermal The kettle was placed in a constant temperature drying oven at 150°C for 24 hours;

[0036] (4) Rinse the electrode obtained in step (3) with deionized water for 3 times, then place the...

Embodiment 2

[0050] Embodiment 2: dechlorination effect experiment

[0051] (1) The construction of the dechlorination reaction device, such as image 3 As shown, the steps are as follows:

[0052] a) The electrolytic cell is an H-type electrolytic cell. The anode chamber and the cathode chamber are separated by a cation exchange membrane (Nafion-117). The volume of the anode chamber and the cathode chamber is 150mL. Add sodium sulfate electrolyte (50mM) to the anode chamber and the cathode chamber, and the volume is 100mL; The electrolyte solution in both the cathode chamber and the cathode chamber needs to be passed through nitrogen for 5 minutes; then add 2,4-dichlorophenol stock solution to the cathode electrolysis chamber with a pipette to make the initial concentration 50mg / L, and then add type B Stirring with magnetic stirring bar;

[0053] b) According to the principle of the three-electrode system, build the circuit of the electrocatalytic dechlorination device. The counter el...

Embodiment 3

[0064] Embodiment 3: Dechlorination effect experiment under different voltages

[0065] Use the Pd / MnO that embodiment 1 prepares 2 -Ni electrode is used as working electrode, carries out dechlorination reaction according to the step of embodiment 2, changes the condition of voltage setting in addition, the value of voltage is respectively set to-0.65,-0.70,-0.75,-0.80,-0.85,-0.90 and -0.95V, carry out 7 dechlorination reactions under the same conditions.

[0066] Pd / MnO at different voltages 2 -Ni electrode dechlorination reaction results are shown in Table 1. As the voltage increases, the amount of active hydrogen species increases continuously, and more active hydrogen is used for dechlorination reaction, so the dechlorination efficiency is continuously enhanced. When the voltage reaches -0.80V, the dechlorination efficiency reaches 100% in the shortest time. However, as the voltage is further increased, although the active hydrogen increases, the amount of hydrogen pro...

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Abstract

The invention discloses a Pd / MnO2-Ni electrode as well as a preparation method and application thereof. The Pd / MnO2-Ni electrode takes porous foamed nickel as an electrode substrate, and MnO2 and Pd nanoparticles are loaded on the porous foamed nickel. According to the Pd / MnO2-Ni electrode, the use amount of Pd is reduced while the catalytic efficiency is improved, compared with a traditional Pd / Celectrode and a Ni / Pd electrode, the Pd / MnO2-Ni electrode has obviously improved activity and remarkably improved dechlorination effect.

Description

technical field [0001] The invention belongs to the field of electrochemical technology, in particular to a Pd / MnO 2 -Ni electrode and its preparation method and application. Background technique [0002] Chlorine-containing organic compounds include chlorinated hydrocarbons, chlorinated aromatic hydrocarbons, polychlorinated biphenyls, chlorinated pesticides, etc., and are an important class of chemical raw materials, intermediates and products. It is widely used in industries such as medicine, pesticide, paper and rubber production, but its large-scale use increases the exposure level in the ecological environment. The vast majority of chlorine-containing organic compounds are toxic to a certain extent, and at the same time, their structures are stable, easy to bioaccumulate, and have hazards such as teratogenicity and carcinogenicity, which pose a huge threat to the health of animals and plants. For this reason, my country's Ministry of Environmental Protection has incl...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F101/36C02F101/34
CPCC02F1/46109C02F2001/46142C02F2101/36C02F2101/345
Inventor 蒋光明李俊熙李向军王霞玲吕晓书
Owner CHONGQING TECH & BUSINESS UNIV
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