ZnSe quantum dot and xanthan gum nanocomposite, electrode for detecting Cd<2+> and/or Cu<2+> and detection method

A nanocomposite material, a technology of zinc selenide, which is applied in the field of electrodes for detecting Cd2+ and/or Cu2+, zinc selenide quantum dots-xanthan gum nanocomposite materials, can solve the problem of poor dispersion, low, easy to aggregate conductivity, etc. problem, to achieve the effect of short time, simple and easy preparation method and high detection efficiency

Active Publication Date: 2017-05-17
SHANDONG JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the widely used electrode modification materials are nano-materials such as nano-metals, metal oxides, and graphene. The above-mentioned modified materials may have problems such as poor dispersion, easy aggregation after modification, or low conductivity.

Method used

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  • ZnSe quantum dot and xanthan gum nanocomposite, electrode for detecting Cd&lt;2+&gt; and/or Cu&lt;2+&gt; and detection method
  • ZnSe quantum dot and xanthan gum nanocomposite, electrode for detecting Cd&lt;2+&gt; and/or Cu&lt;2+&gt; and detection method
  • ZnSe quantum dot and xanthan gum nanocomposite, electrode for detecting Cd&lt;2+&gt; and/or Cu&lt;2+&gt; and detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of ZnSe quantum dot solution: under nitrogen protection, 0.01g NaBH 4Dissolve 0.0061g Se powder in 2mL distilled water, heat to 40°C, and get NaHSe solution after completely dissolving; take 0.0439g Zn(Ac) 2 Dissolve in 20mL of distilled water, add 0.0737g of reduced glutathione after it is completely dissolved, and adjust the pH to 11.5 with 1mol / L NaOH solution to obtain a Zn precursor solution; transfer the Zn precursor into a three-necked flask , quickly inject NaHSe solution under the protection of nitrogen, reflux the oil bath at 100 ° C, magnetically stir for 1 h, take it out and put it in the refrigerator to quickly cool to room temperature to obtain a colorless and transparent solution, which is the prepared ZnSe QDs solution.

[0029] (2) Prepare a xanthan gum solution with a concentration of 0.4 mg / mL, add 100 μL xanthan gum solution to 1 mL quantum dot solution, and disperse ultrasonically to obtain a zinc selenide quantum dot-xanthan gum nan...

Embodiment 2

[0045] (1) Preparation of ZnSe quantum dot solution: preparation of ZnSe quantum dot solution: under nitrogen protection, 0.01gNaBH 4 Dissolve 0.0061g Se powder in 2mL distilled water, heat to 40°C, and get NaHSe solution after completely dissolving; take 0.0439g Zn(Ac) 2 Dissolve in 20mL of distilled water, add 0.0927g of reduced glutathione after it is completely dissolved, and adjust the pH to 11.5 with 1mol / L NaOH solution to obtain a Zn precursor solution; transfer the Zn precursor into a three-necked flask , quickly inject NaHSe solution under the protection of nitrogen, reflux the oil bath at 100 ° C, magnetically stir for 1.5 h, take it out and put it in the refrigerator to cool to room temperature quickly, and obtain a colorless and transparent solution, which is the prepared ZnSe QDs solution.

[0046] (2) Prepare a xanthan gum solution with a concentration of 0.5 mg / mL, add 150 μL xanthan gum solution to 1 mL quantum dot solution, and disperse ultrasonically to obta...

Embodiment 3

[0052] (1) Preparation of ZnSe quantum dot solution: same as in Example 1.

[0053] (2) Prepare a xanthan gum solution with a concentration of 0.6 mg / mL, add 200 μL xanthan gum solution to 1 mL quantum dot solution, and disperse ultrasonically to obtain a zinc selenide quantum dot-xanthan gum nanocomposite solution.

[0054] (3) Preparation of zinc selenide quantum dots-xanthan gum nanocomposite modified electrode: First, dissolve multi-walled carbon nanotubes (MWCNT) in N,N dimethylformamide, and ultrasonically disperse them to a concentration of 1.5mg / mL of the suspension, and take 10 μL of the suspension and drop-coat it on the surface of a glassy carbon (GC) electrode, and dry it in an oven for 30 minutes to obtain a MWCNT / GC electrode; then, take 20 μL of the zinc selenide quantum dot-xanthogen in step (2). The glue nanocomposite solution was drop-coated on the surface of MWCNT / GC electrode and dried at room temperature for 12 hours.

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Abstract

The invention discloses a ZnSe quantum dot and xanthan gum nanocomposite, an electrode for detecting Cd<2+> and / or Cu<2+> and a method for detecting the Cd<2+> and / or Cu<2+>, and belongs to the technical field of electrochemical analysis detection. The ZnSe quantum dot and xanthan gum nanocomposite is prepared from a xanthan gum solution and ZnSe quantum dots (ZnSe QDs) under the action of ultrasonic dispersion. A preparation method of an electrode modified by the ZnSe quantum dot and xanthan gum nanocomposite comprises: dispensing a solution of the ZnSe quantum dot and xanthan gum nanocomposite to the surface of an MWCNT / GC electrode; carrying out drying to prepare the electrode. The ZnSe quantum dot and xanthan gum nanocomposite, the electrode and the method which are disclosed by the invention have the beneficial effects that: the ZnSe quantum dot and xanthan gum nanocomposite is simple in preparation method and has no pollution, and the prepared composite modified electrode can implement simultaneous and respective detection on cadmium and copper ions; a chemical sensor using the electrode has the advantages of high stability, good reproducibility, high interference resistance, low detection limit and the like.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and relates to a zinc selenide quantum dot-xanthan gum nanocomposite material and a method for detecting Cd 2+ and / or Cu 2+ Electrodes and detection methods. Background technique [0002] With the rapid development of industry, the heavy metal pollution produced by a large number of industrialized production has brought harm and negative effects that cannot be ignored to human society and the living environment. Among them, cadmium and copper ions are particularly harmful to environmental pollution and human health. These metal ions are easily enriched in biological tissues and organs, causing permanent damage to the human body and organs. Therefore, how to quickly, accurately and qualitatively and quantitatively detect various heavy metal ions contained in the environment has become a major problem to be solved urgently. At present, relatively mature traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48B82Y30/00C01B19/04
CPCB82Y30/00C01B19/007C01P2004/03C01P2004/64G01N27/308G01N27/48
Inventor 丁永玲孙华东
Owner SHANDONG JIAOTONG UNIV
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