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A modified sepiolite modified electrode and its preparation method and application

A technology for modifying electrodes and sepiolite, applied in the field of electrochemistry, can solve the problem of high impedance of sepiolite clay modified electrodes, and achieve the effects of improving electrochemical performance, fast response speed and enhancing conductivity

Active Publication Date: 2020-02-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impedance of sepiolite clay-modified electrodes is still high, and choosing a suitable mineral modification method to improve the conductivity of sepiolite has become the key to the application of clay-modified electrodes.

Method used

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  • A modified sepiolite modified electrode and its preparation method and application
  • A modified sepiolite modified electrode and its preparation method and application
  • A modified sepiolite modified electrode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 0.2g of SEP, 0.2g of glucose and 50mL of deionized water into a beaker, and then accurately pipette 0.4g of ethylenediamine, and after stirring for 8 hours, evaporate to dryness in a water bath at 80°C. ℃ under an inert atmosphere for 5 h to obtain nitrogen-doped carbon-modified sepiolite (CNSEP).

[0036] (2) Take 0.2 g of the prepared CNSEP and put it into a beaker, then add 5 mL of HF (mass fraction 40%) to fully react, then vacuum filter, wash and dry. Take 0.1 g of the obtained powder, add 50 mL of 6 mol / L HCl, acidify for 5 h under stirring, and filter and wash with suction to obtain CNSEP (ACNSEP) etched with HF and acidified with concentrated HCl.

[0037] (3) Weigh 0.02g of the ACNSEP complex in a conical flask, then add 0.15g of PVP (polyvinylpyrrolidone) as a surfactant, and 0.1785g of CuCl 2 .2H 2 O was used as the copper source, and then 200 mL of deionized water was pipetted with a graduated cylinder, and stirred continuously for 24 hours to mix ...

Embodiment 2

[0056] (1) Add 0.2g of SEP, 0.2g of glucose and 50mL of deionized water into a beaker, and then accurately pipette 0.5g of ethylenediamine. After fully stirring for 8 hours, evaporate to dryness in a water bath at 80°C. The obtained sample is at 700 ℃ under an inert atmosphere and calcined for 4 hours to obtain nitrogen-doped carbon-modified sepiolite (CNSEP).

[0057] (2) Take 0.2 g of the prepared CNSEP and put it into a beaker, then add 5 mL of HF (mass fraction 40%) to fully react, then vacuum filter, wash and dry. Take 0.1 g of the obtained powder, add 50 mL of 6 mol / L HCl, acidify for 5 h under stirring, and filter and wash with suction to obtain CNSEP (ACNSEP) etched with HF and acidified with concentrated HCl.

[0058] (3) Weigh 0.02g of the ACNSEP compound in a conical flask, then add 0.16g of CTAB (cetyltrimethylammonium bromide) as a surfactant, and 0.2g of CuSO 4 .5H 2 O was used as the copper source, and then 200 mL of deionized water was pipetted with a graduat...

Embodiment 3

[0061](1) Add 0.2g of SEP, 0.2g of glucose and 50mL of deionized water into a beaker, and then accurately pipette 0.45g of ethylenediamine. After fully stirring for 8 hours, evaporate to dryness in a water bath at 80°C. The obtained sample is at 600 ℃ under an inert atmosphere for 5 h to obtain nitrogen-doped carbon-modified sepiolite (CNSEP).

[0062] (2) Take 0.2 g of the prepared CNSEP and put it into a beaker, then add 5 mL of HF (mass fraction 40%) to fully react, then vacuum filter, wash and dry. Then take 0.1 g of the obtained powder, add 50 mL of 6 mol / L HCl, acidify for 5 h under stirring, and filter and wash with suction to obtain CNSEP (ACNSEP) etched with HF and acidified with concentrated HCl.

[0063] (3) Weigh 0.02g of the ACNSEP complex in a conical flask, then add 0.14g of CTAB (cetyltrimethylammonium bromide) as a surfactant, and 0.16g of CuSO 4 .5H 2 O was used as the copper source, and then 200 mL of deionized water was pipetted with a graduated cylinder,...

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Abstract

The invention provides a modified sepiolite modified electrode and a preparation method and application thereof. The preparation method specifically comprises the steps that sepiolite raw ores are subjected to nitrogen-doped carbon modification with glucose as a carbon source and ethidene diamine as a nitrogen source, and then the specific area is increased through HF etching and HCl acidizing; and finally, in-situ Ag doping is conducted, and thus the novel sea-urchin-shaped Cu2O modified sepiolite modified electrode is obtained. Through the methods of nitrogen-doped carbon modification, HF etching, Cu2O assembling, Ag doping and the like, the specific area of a material is increased, electrical conductivity is improved, and thus the electrochemical property is significantly improved; andthe modified sepiolite modified electrode has rapid response to the H2O2 concentration, the low application potential is -0.45 V, the wide detection range is 1.0*10<-6>-3.295*10<-3> M, the low detection limit is 2.0*10<-8> M, and meanwhile, the modified sepiolite modified electrode has the advantages of repeatability, reproducibility, good stability, high anti-jamming capability and the like, andhas quite wide application prospects.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a modified sepiolite modified electrode and a preparation method and application thereof. Background technique [0002] In recent years, clay-based functional nanocomposites have gradually become a research hotspot in the fields of catalysis, adsorption, and electrochemistry. The introduction of clay minerals such as kaolinite, halloysite, montmorillonite, and sepiolite as carriers not only effectively immobilizes functional nanoparticles and improves the agglomeration of reactants, but also in the process of adsorption or catalysis, between clay and functional A synergistic effect occurs among the materials, which further significantly improves the comprehensive performance of the reactants. However, due to the poor conductivity of minerals, it is necessary to enhance the conductivity of clay through appropriate modification methods to expand its research and application in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 唐爱东闫鹏张毅杨华明
Owner CENT SOUTH UNIV
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