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Method of trace detection of copper ion through CoNiO2 nanomaterial modified glassy carbon electrode

A glassy carbon electrode and nanomaterial technology, applied in the field of nanomaterials for electrochemical detection, can solve problems such as energy consumption, excessively long preparation period, uneven distribution of particle size and morphology, etc.

Active Publication Date: 2019-01-08
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of the present invention replaces the calcining method in the traditional sense with the microwave method, in order to solve the problems of the traditional calcining method, such as uneven particle size distribution, long preparation period and serious energy consumption, and provide a new method with excellent effect and easy to popularize and apply. way

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Examples

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Effect test

Embodiment 1

[0025] Hydrothermal preparation of hydroxides:

[0026] a. Weigh nickel nitrate and cobalt nitrate in a molar ratio of 1:1 and mix them, dissolve them in deionized water, stir evenly, and prepare a 0.1mol / L mixed solution;

[0027] b, then weigh sodium hydroxide according to the molar ratio of sodium hydroxide, nickel nitrate and cobalt nitrate as 1.2:1, and make a solution with a concentration of 0.1mol / L, then add the prepared solution dropwise to the mixture obtained in step a In the solution, stir magnetically at room temperature for 1 hour, then let it stand for precipitation for 12 hours, filter and wash until neutral, and dry at 50°C for 6 hours to obtain a precipitate;

[0028] c. Disperse the precipitate obtained in step b in deionized water containing 0.5wt% polyvinylpyrrolidone, stir it magnetically for 1 hour, put it into a 100mL high-pressure hydrothermal kettle, control the filling ratio at 50%, and the hydrothermal temperature is 100°C. The hydrothermal synthes...

Embodiment 2

[0040] Hydrothermal preparation of hydroxides:

[0041] a. Take nickel nitrate and cobalt nitrate according to the molar ratio of 1:1 and mix them, dissolve them in deionized water, stir evenly, and prepare a 3mol / L mixed solution;

[0042] b, then weigh sodium hydroxide according to the molar ratio of sodium hydroxide, nickel nitrate and cobalt nitrate as 1.2:1, and make a solution with a concentration of 3mol / L, then add the prepared solution dropwise to the mixed solution obtained in step a , stirred magnetically at room temperature for 2 hours, then allowed to settle for 24 hours, filtered and washed until neutral, and dried at 80°C for 10 hours to obtain a precipitate;

[0043] c. Disperse the precipitate obtained in step b in deionized water containing 4wt% polyvinylpyrrolidone, stir it magnetically for 2 hours, put it into a 100mL high-pressure hydrothermal kettle, control the filling ratio at 70%, and the hydrothermal temperature is 140°C. For hydrothermal synthesis u...

Embodiment 3

[0056] Hydrothermal preparation of hydroxides:

[0057] a. Take nickel nitrate and cobalt nitrate as 1:1 by molar ratio and mix them, dissolve them in deionized water, stir evenly, and prepare a 5mol / L mixed solution;

[0058] b, then weigh sodium hydroxide by the molar ratio of sodium hydroxide, nickel nitrate and cobalt nitrate to be 1.2:1, and make a solution with a concentration of 5mol / L, then add the prepared solution dropwise to the mixed solution obtained in step a , stirred magnetically at room temperature for 3 hours, then allowed to settle for 48 hours, filtered and washed until neutral, and dried at 100°C for 12 hours to obtain a precipitate;

[0059] c. Disperse the precipitate obtained in step b in deionized water containing 8wt% polyvinylpyrrolidone, stir it magnetically for 3 hours, put it into a 100mL high-pressure hydrothermal kettle, control the filling ratio at 80%, and the hydrothermal temperature is 200°C. In order to carry out hydrothermal synthesis und...

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Abstract

The invention relates to a method of trace detection of a copper ion through a CoNiO2 nanomaterial modified glassy carbon electrode. The method comprises the steps as follows: mixing a saline solutionof Co and Ni ions with sodium hydroxide for a reaction to generate a sediment, performing hydrothermal treatment on the sediment at a certain temperature, performing microwave treatment on a Co-Ni bimetallic material after the hydrothermal treatment to form a CoNiO2 nanomaterial, and finally dispersedly modifying the CoNiO2 nanomaterial on a glassy carbon electrode for heavy metal copper ion detection. The method can achieve high selectivity detection of copper ions and has the advantages of high detection sensitivity, good stability, high interference immunity, wide linear detection range and the like. According to the method, the traditional calcining method is replaced with a microwave method, the problems of uneven distribution of particle size and pattern, long preparation cycle, serious energy consumption and the like of the traditional calcining method are solved, and a new approach that has an excellent effect and is convenient to popularize and apply is provided.

Description

technical field [0001] The invention relates to the technical field of nanomaterials for electrochemical detection, in particular to a CoNiO for trace detection of copper ions 2 A method for modifying glassy carbon electrodes with nanomaterials. Background technique [0002] Copper is highly toxic to lower organisms and crops, and its mass concentration of 0.1-0.2mg / L can kill fish. The toxicity can increase when it coexists with zinc, and it is more toxic to shellfish aquatic organisms. Generally, copper is required for aquatic water The mass concentration is below 0.01mg / L. For crops, copper is the most toxic heavy metal. After plants absorb copper ions, they are fixed in the root cortex, affecting nutrient absorption. When the copper content in irrigation water is high, it will accumulate in the soil and crops, which can cause the crops to die. [0003] At present, the traditional methods for detecting heavy metal copper ions mainly include atomic fluorescence spectrom...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 陈龙付海海王昊郭旭虹史玉琳李昊泉范长春魏婷婷
Owner SHIHEZI UNIVERSITY
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