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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, resulting in electrostatic repulsion between the pollutants and the cathode electrode, weakening its mass transfer effect, and affecting dechlorination performance.

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
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: prepare the Pd / C electrocatalyst modified by quaternary ammonium salt

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

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

[0037] (3) After stirring the mixture on a magnetic stirrer for 40 minutes, add NaBH dropwise 4 Solution, keep stirring for reaction, suction filter after the reaction, wash with deionized water several times, put it into a constant temperature oven and dry to obtain nano Pd / C composite material;

[0038] (4) The tetraethylammonium chloride that takes 0.3637g is dissolved in the ethanol of 50mL;

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

Embodiment 2

[0041] Embodiment 2: prepare the Pd / C electrocatalyst electrode of quaternary ammonium salt modification

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

[0043] (2) In the Pd / C electrocatalyst modified by the quaternary ammonium salt prepared in Example 1, add 40uL Nafion, 0.4mL isopropanol as a binder, and ultrasonically disperse the mixed solution; pipette the mixed solution 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 evaporate completely before dripping it again; after dripping, put it in a constant temperature oven and bake it. The Pd / C electrocatalyst electrode modified by quaternary ammonium salt can be obtained.

[0044] The real photo of the Pd / C elect...

Embodiment 3

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

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

[0047] a) The dechlorination reaction tank is an H-type electrolyzer; the anode chamber is separated from the cathode chamber by a cation exchange membrane (Nafion-117), and the volume of the two chambers is 200mL; sodium sulfate is added to the anode chamber and the cathode chamber as Electrolyte, the volume is 100mL, and nitrogen gas must be flowed for 10min before the reaction; B-type magnetic stirring bar stirring;

[0048] b) According to the principle of the three-electrode system, build the circuit of the electrocatalytic dechlorination device, wherein the counter electrode is a platinum electrode (30mm×30mm), the reference electrode is Ag / AgCl (3.0M KCl), and the working electrode...

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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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