Preparation method of bimetallic loaded graphene catalyst for electrochemical detection of chlorophenol pollutants

A bimetal and graphene technology, applied in the field of environmental pollutant detection, can solve the problems such as difficulty in controlling the particle size of silver-supported graphene catalysts

Active Publication Date: 2017-07-14
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) It is difficult to control the particle size of silver-loaded graphene catalysts to be within 10nm with better catalytic effect by mild and wet chemical method;

Method used

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  • Preparation method of bimetallic loaded graphene catalyst for electrochemical detection of chlorophenol pollutants

Examples

Experimental program
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Embodiment 1

[0024] Graphite oxide was prepared by the improved Hummers method. 0.2 g of graphite oxide was dispersed in 200 mL of deionized water, and ultrasonically treated for 2 h to obtain a graphite oxide solution (1.0 mg / mL). Dissolve 0.4g of polyvinylpyrrolidone in 100mL of 1% ethanol to prepare a 4% PVP dispersant solution, add 8mL of 4% PVP dispersant solution to the graphite oxide solution dropwise, and stir vigorously for 10-30min to oxidize Graphite and PVP are mixed evenly. Get 20mg palladium nitrate and dissolve in 10% nitric acid of 100mL, configure the palladium nitrate metal precursor solution of 0.2g / L, get the above-mentioned 0.2g / L palladium nitrate precursor solution of 12.5mL and join in the above-mentioned mixed solution, stir vigorously for 10 After ~30min, add 30% ammonia water dropwise, and adjust the pH of the mixture to 8~12; take 0.2g of silver nitrate and dissolve it in 1000mL of water to prepare a 0.2g / L silver nitrate metal precursor, and mix 8mL of 0.2g / L ...

Embodiment 2

[0026] This example is similar to the steps of Example 1, except that the amount of the metal precursor solution added is different: take 20 mg of palladium nitrate and dissolve it in 100 mL of 10% nitric acid to prepare a 0.2 g / L palladium nitrate metal precursor solution, and take 25 mL of The above 0.2g / L palladium nitrate precursor solution was added to the mixed solution described in Example 1, and after vigorous stirring for 10-30min, the pH was adjusted to 8-12; 0.2g silver nitrate was dissolved in 1000mL water, and 0.2g / L silver nitrate metal precursor solution, 16mL of 0.2g / L silver nitrate solution was added to the mixed solution, then continued to stir for 2h and mixed evenly, then reduced according to the reduction method in Example 1. The theoretical loading ratio of silver-palladium bimetallic elements in the prepared catalyst is 1:1.

Embodiment 3

[0028]This example is similar to the steps in Example 1, except that the amount of metal precursor solution added is different: take 25mL of 0.2g / L palladium nitrate precursor solution and add it to the mixed solution described in Example 1, and stir vigorously for 10-30min Finally, adjust the pH to 8-12; add 32mL of 0.2g / L silver nitrate solution into the mixture, then continue to stir for 2h to mix evenly and then reduce according to the reduction method in Example 1. The theoretical loading ratio of silver-palladium bimetallic elements in the prepared catalyst is 1:2.

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Abstract

The invention relates to a preparation method of a bimetallic loaded graphene catalyst for electrochemical detection of chlorophenol pollutants, and belongs to the field of detection of environment pollutants. The preparation method is characterized in that a warm and damp electrochemical reduction method is used for controllably preparing the series of silver and palladium bimetallic loaded graphene catalyst, and a drip coating method is used for preparing a working electrode, so as to complete the electrochemical detection of chlorophenol pollutants; the palladium nanoparticles in the catalyst material are used as a precursor of the bimetallic loaded graphene catalyst, and provide nucleation sites for the growth of silver nanoparticles, so that the particle size of easy-agglomeration silver nanoparticles in the warm and damp electrochemical reduction method can be controlled; the bimetallic loaded graphene catalyst has high conductivity of the silver nanoparticles, and electrochemical sensitivity of palladium nanoparticles on the chloride-containing organic matters, the property of the catalyst is greatly improved, and the catalyst can be applied to the electrochemical detection of low-concentration chlorophenol.

Description

technical field [0001] The invention relates to a preparation method of a bimetallic supported graphene catalyst used for the electrochemical detection of chlorophenol pollutants; specifically, it refers to the mild wet chemical preparation of a silver-palladium bimetallic nanoparticle-supported graphene catalyst, which can be prepared as A composite film modified glassy carbon electrode is used for electrochemical detection of chlorophenol pollutants, which belongs to the field of environmental pollutant detection. Background technique [0002] Chlorophenols (CPs) are one of the typical persistent organic pollutants (Persistent Organic Pollutants, POPs). Chlorophenols have a stable conjugated structure formed by chlorine atom p electrons and benzene ring π electrons. In addition to carcinogenic, teratogenic, and mutagenic effects, it also has the characteristics of high toxicity, refractory degradation, easy bioaccumulation, and strong biological stability, which is extreme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50
CPCB01J23/50B01J35/393B01J35/33
Inventor 卞兆勇杨亚静王辉
Owner BEIJING NORMAL UNIVERSITY
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