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Preparation of a chitosan-graphene quantum dot nanocomposite and its modified electrode for electrochemical detection of heavy metal ions

A technology of graphene quantum dots and nanocomposite materials, applied in the direction of electrochemical variables of materials, etc., can solve the problems of low mechanical strength of chitosan, etc., and achieve the effects of simultaneous and high-sensitivity detection, and the preparation method is simple and easy to implement.

Active Publication Date: 2017-10-20
CHANGZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nevertheless, chitosan has limited its wide application due to its low mechanical strength

Method used

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  • Preparation of a chitosan-graphene quantum dot nanocomposite and its modified electrode for electrochemical detection of heavy metal ions
  • Preparation of a chitosan-graphene quantum dot nanocomposite and its modified electrode for electrochemical detection of heavy metal ions
  • Preparation of a chitosan-graphene quantum dot nanocomposite and its modified electrode for electrochemical detection of heavy metal ions

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Embodiment 1

[0023] Preparation of chitosan-graphene quantum dot nanocomposite material comprises the following steps:

[0024] (1) Weigh 2.0 g of citric acid and grind it into a white powder, put it into a 10 mL crucible, and heat and react at 200° C. for 0.5 h with a program-controlled box-type electric furnace. After the reaction, take out the solid sample, add 10mL ultrapure water, and dissolve it by ultrasonic. After the product was fully dissolved, the yellow transparent solution was obtained by suction filtration, and stored in the dark at room temperature.

[0025] (2) Prepare a chitosan solution with a concentration of 2mg / mL, dissolve the chitosan powder in 0.1M acetic acid solution, stir and dissolve, add 2mg / mL graphene quantum dot solution dropwise, and keep stirring during the reaction , adding dropwise sodium hydroxide solution until the pH is 4.5, and a yellow solid precipitate is precipitated as a chitosan-graphene quantum dot nanocomposite material, which is freeze-dried...

Embodiment 2

[0027] Chitosan-graphene quantum dots / bismuth film modified electrode pair Zn 2+ 、Cd2+ and Pb 2+ Implementing simultaneous detection involves the following steps:

[0028] (1) Ultrasonic disperse the graphene quantum dot-chitosan composite material in ultrapure water, pipette 5 μL (2 mg / mL) of the dispersion liquid onto the surface of the glassy carbon electrode, and dry at room temperature for 1 h .

[0029] (2) In this experiment, square wave stripping voltammetry (SWSV) was used to measure Zn in water. 2+ 、Cd 2+ and Pb 2+ . The experiment adopts a three-electrode system, in which the working electrode is a chitosan-graphene quantum dot composite modified glassy carbon electrode (diameter 3mm), the platinum sheet is the auxiliary electrode, and the saturated calomel electrode (SCE) is the three-electrode system of the reference electrode . The chitosan-graphene quantum dot nanocomposite modified electrode was placed in 20mL 0.1mol / L NaAc-HAc buffer solution (pH=5.5) (...

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Abstract

The invention relates to the preparation of a chitosan-graphene quantum dot nanocomposite material and its modified electrode combined with a bismuth film to simultaneously detect Zn2+, Cd2+ and Pb2+ by an electrochemical method, comprising the following steps: preparing graphene quantum dots, preparing a shell Polysaccharide-graphene quantum dot nanocomposite material, preparation of chitosan-graphene quantum dot nanocomposite modified electrode, and simultaneous detection of Zn2+, Cd2+ and Pb2+ by electrochemical method combined with bismuth film. The beneficial effect of the present invention is: the preparation method of chitosan-graphene quantum dot nano-composite material is simple and easy, and the preparation process is environmentally friendly and pollution-free, and the chitosan-graphene quantum dot / bismuth film modified electrode is paired with Zn2+, Cd2+ and Pb2+ can be detected simultaneously and with high sensitivity.

Description

technical field [0001] The invention relates to the preparation of a chitosan-graphene quantum dot nanocomposite material and the combination of its modified electrode and bismuth film to simultaneously detect Zn by electrochemical method 2+ 、Cd 2+ and Pb 2+ , which belongs to the research field of nanomaterial preparation and electrochemical detection. technical background [0002] In recent years, there has been increasing interest in sustainable and environmentally friendly natural polymers. Chitosan (CS), cationic (1-4)-2-amino-2-deoxy-β-D-glucan, generally obtained by deacetylation of chitin, is one of the most abundant natural polymers on Earth . With good biocompatibility, biodegradability, multifunctional groups and many other advantages, chitosan has attracted more attention in the fields of food packaging, water treatment, membrane separation, tissue engineering and drug sustained release. Nevertheless, chitosan has limited its wide application due to its low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 孔泳欧洁
Owner CHANGZHOU UNIV