Preparation method of nano-bismuth trioxide graphene composite membrane electrode for detecting lead ions and cadmium ions

A composite technology of bismuth trioxide and graphene, which is used in measurement devices, material electrochemical variables, material analysis by electromagnetic means, etc., can solve the limitations of graphene research and application, insoluble in water and commonly used organic solvents, etc. problem, to achieve the effect of good linear response, environmental friendliness and high sensitivity

Active Publication Date: 2018-05-22
HARBIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, there is a strong van der Waals force between graphene sheets, which is prone to agglomeration, making it difficult to dissolve in water and common organic solvents, which limits the further research and application of graphene.

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  • Preparation method of nano-bismuth trioxide graphene composite membrane electrode for detecting lead ions and cadmium ions
  • Preparation method of nano-bismuth trioxide graphene composite membrane electrode for detecting lead ions and cadmium ions
  • Preparation method of nano-bismuth trioxide graphene composite membrane electrode for detecting lead ions and cadmium ions

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specific Embodiment approach 1

[0031] A method for preparing a nano bismuth trioxide graphene composite film electrode for detecting lead ions and cadmium ions, comprising the steps of:

[0032] Step 1. Synthesize nano bismuth trioxide, dissolve 0.5mmol bismuth acetate in 45ml dimethylformamide, heat in an autoclave at 180°C for 12h, naturally cool to room temperature, wash with deionized water and ethanol after centrifugation Three times to obtain the precursor of nano bismuth trioxide. Raise the temperature of the nano-bismuth trioxide precursor to 300 °C at a rate of 1 °C / min, and heat it for 2 hours to obtain nano-bismuth trioxide for use;

[0033] Step 2. To synthesize graphene oxide, add 1g of sodium nitrate to 50ml of concentrated sulfuric acid, cool in an ice bath to 0°C, slowly add 2g of natural graphite under stirring conditions, and keep stirring continuously for 30min while keeping the reaction temperature not higher than 5°C , add 6g of potassium permanganate and continue to stir for 30min, then...

specific Embodiment approach 2

[0046] A method for preparing a nano bismuth trioxide graphene composite film electrode for detecting lead ions and cadmium ions, comprising the steps of:

[0047] Step 1. Synthesize nano bismuth trioxide, dissolve 1.0mmol bismuth acetate in 50ml dimethylformamide, heat in an autoclave at 180°C for 10h, naturally cool to room temperature, wash with deionized water and ethanol after centrifugation Three times to obtain the precursor of nano bismuth trioxide. Raise the temperature of the nano-bismuth trioxide precursor to 300 °C at a rate of 0.5 °C / min, and heat-calcine for 3 hours to obtain nano-bismuth trioxide for use;

[0048] Step 2. To synthesize graphene oxide, add 1.5g of sodium nitrate to 50ml of concentrated sulfuric acid, cool in an ice bath to 0°C, slowly add 3g of natural graphite under stirring conditions, and keep stirring continuously for 30min while keeping the reaction temperature not higher than 5°C Finally, add 7g of potassium permanganate and continue to st...

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Abstract

The invention discloses a preparation method of a nano-bismuth trioxide graphene composite membrane electrode for detecting lead ions and cadmium ions, and belongs to the technical field of electrodematerials. The preparation method comprises the following steps: ultrasonically dispersing 1 to 2 mg of nano-bismuth trioxide graphene composite powder in 500 [mu]L of 10 percent Nafion solution to obtain nano-bismuth trioxide composite graphene glassy carbon electrode modifying liquid; performing ultrasonic treatment on the glassy carbon electrode for 5 minutes by using ethyl alcohol, nitric acidand deionized water in sequence, repeatedly grinding the treated glassy carbon electrode to a mirror surface by using alpha-Al2O3 powder with the particle sizes of 1.0, 0.3 and 0.05 [mu]m in sequence, and drying after the mirror surface is subjected to ultrasonic cleaning for 5 seconds by using the deionized water; dripping and coating the treated glassy carbon electrode surface with 6 to 10 [mu]L of the nano-bismuth trioxide composite graphene glassy carbon electrode modifying liquid which is prepared in the fifth step; drying the glassy carbon electrode surface by nitrogen to obtain the nano-bismuth trioxide graphene composite membrane electrode. According to the preparation method of the nano-bismuth trioxide graphene composite membrane electrode for detecting the lead ions and the cadmium ions, peak shapes of dissolution peaks of heavy metal ions to be detected are symmetrical; the reproducibility is high; the sensitivity is high; the detection limit is low.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a preparation method of a nano bismuth trioxide graphene composite film electrode for detecting lead ions and cadmium ions. Background technique [0002] Anodic stripping voltammetry (ASV) has been widely used in the determination of heavy metal elements due to its high sensitivity and selectivity, convenience and cheapness, and simple structure of testing equipment. The detection of trace heavy metals is very important in the fields of food, industrial analysis, and environmental detection. Among many detection methods, electrochemical sensors have been widely used in various fields due to their good selectivity, easy microquantification, and easy operation. , common glassy carbon electrodes are commonly used in electrochemical sensors, but the sensitivity is not high. After pre-plating mercury film on the surface of glassy carbon electrodes, the linear r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/42G01N27/30G01N27/333
CPCG01N27/308G01N27/333G01N27/42
Inventor 崔闻宇曹吉越吕江维
Owner HARBIN UNIV OF COMMERCE
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