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A preparation method of nano-gold colorimetric sensor, its prepared sensor and application

A colorimetric sensor and nano-gold technology, which is applied in the fields of environmental science, laboratory chemistry and analytical chemistry, can solve the problems of strict sample storage conditions, high cost of analysis methods, and strong operation professionalism, achieving strong selectivity, high sensitivity, good repeatability

Active Publication Date: 2019-01-25
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a solution for the problems of strict sample storage conditions, high cost of analysis methods, long analysis time, and strong professionalism in most existing methods for detecting chromium ions, such as ICP, AAS, and AFS. A kind of preparation method of nano-gold colorimetric sensor, its prepared sensor and application

Method used

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  • A preparation method of nano-gold colorimetric sensor, its prepared sensor and application
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  • A preparation method of nano-gold colorimetric sensor, its prepared sensor and application

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Embodiment 1

[0074] Add 100mL of 0.24mM chloroauric acid tetrahydrate to a 250mL Erlenmeyer flask (soak overnight in freshly prepared aqua regia, wash with ultrapure water, dry, and set aside), heat to boiling, add 0.034M trisodium nitrilotriacetate solution under magnetic stirring 4mL, heat to reflux for 20min, the solution turns from light yellow to wine red, stop heating, continue to stir to room temperature, and store in the dark at room temperature.

[0075] Measure the ultraviolet-visible absorption spectrum of the nano-gold solution modified by trisodium nitrilotriacetate prepared in this embodiment, such as figure 1 shown. from figure 1 It can be seen that a characteristic absorption peak appears at 528 nm.

Embodiment 2

[0077] The nano-gold colorimetric sensor modified with trisodium nitrilotriacetate prepared above was mixed with an equal volume concentration of 1×10 -6 The potassium dichromate aqueous solution of M is mixed, and the change of the corresponding ultraviolet-visible spectrum is detected within 1 to 37 minutes using a UV-visible spectrometer (Uv-Vis). It can be seen that the UV-visible absorption peak of the nano-gold solution begins to be obvious at 7 minutes. reduce, such as figure 2 shown.

[0078] Observe the ratio of the absorption value corresponding to the characteristic absorption wavelength (A 650 / A 528 ) changes with time, such as image 3 As shown, it can be seen that the value is basically stable after 25min, so the nano-gold probe modified by nitrilotriacetic acid can quickly detect Cr 6+ .

Embodiment 3

[0080] The nano-gold colorimetric sensor modified with trisodium nitrilotriacetate prepared in Example 1 was used for 2×10 -6 M Cr 6+ For detection, take 1.5mL concentration as 2×10 -6 M potassium dichromate aqueous solution, and then measure 1.5mL containing other metal ions (FeCl 3 ,FeCl 2 , KCl, NaCl, CuCl 2 ,MnCl 2 ,CdCl 2 ,CoCl 2 ,NiCl 2 ,Pb(NO 3 ) 2 ,ZnCl 2 ,HgCl 2 ,MgCl 2 ,CaCl 2 ,AlCl 3 ,CrCl 3 ) concentration is 2×10 -5 For the aqueous solution of M, the above-mentioned gold nanoparticles modified by trisodium nitrilotriacetate were mixed with the solution containing the above-mentioned metal ions, and 100 μL of 0.2M acetic acid-sodium acetate buffer (pH=3.6) was added, and the color change was observed. It was found that only Cr 6+ The nano-gold solution turns from red to blue, such as Figure 4 shown.

[0081] Simultaneously measure the ultraviolet-visible absorption spectrum of the nanogold modified by trisodium nitrilotriacetate and the mixed so...

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Abstract

The invention discloses a preparation method of a nano gold colorimetric sensor, and a sensor prepared by the method and application thereof. The invention aims to overcome the defects of severe sample preservation conditions, high analysis method cost, long analysis time, high operation speciality and the like in most existing chromium ion detection processes (such as ICP (inductively coupled plasma), AAS (atomic absorption spectroscopy), AFS (atomic fluorescence spectroscopy) and the like). By using a gold salt as a gold nanoparticle source and trisodium nitrilotriacetate as a reducer and ligand, reaction is carried out under the condition of a boiling gold salt solution to obtain the stable water-soluble trisodium-nitrilotriacetate-modified nano gold colorimetric sensor. The sensor is convenient to carry, has the advantages of high sensitivity, high selectivity, stability and the like, can implement quick detection on Cr<6+>, has the advantages of high detection speed, high sensitivity and the like, and thus, has wide application prospects and higher market application value.

Description

technical field [0001] The invention relates to the fields of environmental science, laboratory chemistry and analytical chemistry, in particular to a preparation method of a nano-gold colorimetric sensor, a prepared sensor and an application thereof. The invention provides a sensor for fast, sensitive and visual detection and analysis of hexavalent chromium ions and its application, which has good effect. Background technique [0002] Chromium ion, as a trace element necessary for the human body, plays a special role in the body's glucose metabolism and lipid metabolism. The common valence states of chromium ions are trivalent and hexavalent. Trivalent chromium and hexavalent chromium in the environment will be converted into each other; hexavalent chromium can be reduced to trivalent chromium in the presence of a reducing agent. A small amount of trivalent chromium is beneficial to the human body, but excessive trivalent chromium enters the organism and will be toxic. At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 黄德顺赵鹏翔魏建宇岳国宗朱婧杨晓娇常凤雯
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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