Quaternary ammonium salt modified Pd/C electrocatalyst as well as electrode and preparation and application thereof

An electrocatalyst and quaternary ammonium salt technology, applied in the field of electrochemistry, can solve the problems of weakening the mass transfer effect, affecting the dechlorination performance, etc., and achieve the effects of improving the dechlorination efficiency, high recycling rate and less by-products

Active Publication Date: 2019-08-30
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the mass transfer characteristics of pollutants, chlorine-containing pollutants are hydrolyzed into negatively charged ions in the electrolyte

Method used

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  • Quaternary ammonium salt modified Pd/C electrocatalyst as well as electrode and preparation and application thereof
  • Quaternary ammonium salt modified Pd/C electrocatalyst as well as electrode and preparation and application thereof
  • Quaternary ammonium salt modified Pd/C electrocatalyst as well as electrode and preparation and application thereof

Examples

Experimental program
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Example Embodiment

[0034] Example 1: Preparation of Pd / C electrocatalyst modified with quaternary ammonium salt

[0035] (1) Weigh 20 mg of carbon powder, disperse it in 40 mL of deionized water, put it in an ultrasonic cleaner and sonicate it uniformly, and then transfer it to a constant temperature magnetic stirrer to stir;

[0036] (2) Weigh 18 mg of sodium tetrachloropalladate and dissolve it in 10 mL of deionized water, then slowly add it dropwise to the uniformly dispersed carbon powder solution in (1), and continue to stir;

[0037] (3) Put the mixture on a magnetic stirrer and stir for 40 minutes, then add NaBH dropwise 4 The solution is kept stirring for reaction. After the reaction, it is filtered with suction, washed with deionized water several times, and dried in a constant temperature oven to obtain a nano-Pd / C composite material;

[0038] (4) Weigh 0.3637g of tetraethylammonium chloride and dissolve it in 50mL of ethanol;

[0039] (5) Weigh 15 mg of nano-Pd / C composite material and disperse...

Example Embodiment

[0041] Example 2: Preparation of Pd / C electrocatalyst electrode modified by quaternary ammonium salt

[0042] (1) Cut 3*3cm 2 Cut the 2cm length of copper glue, fold it in half, and paste it on both sides of the carbon paper, leaving 0.5cm in length, and smear the copper glue area with silica gel on the carbon paper area with a thickness of 1mm;

[0043] (2) In the quaternary ammonium salt modified Pd / C electrocatalyst prepared in Example 1, 40uL Nafion and 0.4mL isopropanol were added as a binder, and the mixture was dispersed uniformly by ultrasound; the mixture was pipetted with a dropper, Evenly drip onto the blank carbon paper (that is, the area without copper glue and silica gel). When dripping, you need to wait for the last applied liquid to completely volatilize before dripping; after dripping, put it in a constant temperature oven and bake it. Pd / C electrocatalyst electrode modified by quaternary ammonium salt can be obtained.

[0044] The real shot photos of the quaternary...

Example Embodiment

[0045] Example 3: Using the quaternary ammonium salt modified Pd / C electrocatalyst electrode prepared in Example 2 to investigate its dechlorination effect on the pollutant 2,4-dichlorophenol

[0046] (1) Construction of the dechlorination reaction device, the steps are as follows:

[0047] a) The dechlorination reaction tank is an H-type electrolyzer; the connecting channel between the anode chamber and the cathode chamber is separated by a cation exchange membrane (Nafion-117), and the volume of both chambers is 200 mL; sodium sulfate is added to the anode and cathode chambers as Electrolyte, the volume is 100mL, and nitrogen must be vented for 10 minutes before the reaction; then use a pipette to add 2,4-dichlorophenol stock solution to the cathodic electrolysis chamber, the initial concentration of which is 50mg / L, and then add B-type magnetic stir bar for stirring;

[0048] b) According to the principle of the three-electrode system, build the circuit of the electrocatalytic de...

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Abstract

The invention discloses a quaternary ammonium salt modified Pd/C electrocatalyst as well as an electrode and preparation and application thereof. The electrocatalyst comprises carbon dust and Pd nanoparticles, wherein the Pd nanoparticles are supported by the carbon dust to form a nano Pd/C composite material; and quaternary ammonium salt is adhered to the surface of the nano Pd/C composite material. The quaternary ammonium salt is adopted to modify Pd/C, by virtue of the electropositivity and the complexing effect (with pollutants) of the quaternary ammonium salt, the electrostatic repulsiveinteraction of chlorine-containing pollutants with cathode electrodes can be alleviated, adsorption of the chlorine-containing pollutants can be enhanced, and dechloridation efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a quaternary ammonium salt-modified Pd / C electrocatalyst, an electrode and its preparation and application. Background technique [0002] Chlorinated Organic compounds (Chlorinated Organic compounds, COCs) refer to organic compounds in which the hydrogen atoms in the molecular structure are replaced by chlorine atoms, mainly including chlorinated hydrocarbons, chlorinated aromatic hydrocarbons, polychlorinated biphenyls, organochlorine pesticides, and organochlorine pesticides. Insecticides, etc., they are an important class of chemical production raw materials and intermediates, but they are also highly toxic pollutants. In production and life, the non-standard use and storage of chlorine-containing organic substances will cause water, soil and groundwater systems to be polluted to varying degrees. These chlorine-containing organic compounds have a stable s...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B3/04B01J31/02B01J23/44B01J37/16B01J37/02C25B3/25
CPCB01J31/0254B01J23/44B01J37/16B01J37/0201B01J37/0018B01J37/0228C25B3/25C25B11/091
Inventor 蒋光明石雪林李向军吕晓书
Owner CHONGQING TECH & BUSINESS UNIV
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