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Salicylic acid functionalized graphene modified electrode and heavy metal detection method thereof

A salicylic acid and fossil technology, which is applied to the preparation of salicylic acid functionalized graphene modified electrodes and the field of heavy metal detection, can solve the problems of difficulty in rapid detection, easy to be polluted, matrix interference, etc., and is beneficial to surface functionalization. The effect of modification, improved sensitivity, and lower detection limit

Active Publication Date: 2014-03-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the flame atomic absorption method is easy to operate, fast in analysis speed, has little interference and stable signal when determining high-concentration elements, but the detection limit is high, which is not suitable for the detection of low-concentration heavy metals; graphite furnace atomic absorption method is sensitive and accurate in analysis. Inductively coupled plasma mass spectrometry has high analytical sensitivity, good selectivity, and can analyze multiple elements at the same time, but it is expensive and susceptible to contamination. At the same time, these methods are difficult to meet the needs of rapid detection

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  • Salicylic acid functionalized graphene modified electrode and heavy metal detection method thereof
  • Salicylic acid functionalized graphene modified electrode and heavy metal detection method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Electrode preparation process

[0033] (1) Preparation of salicylic acid functionalized graphene modified electrode;

[0034] a. Preparation of graphene oxide by Hummer method

[0035] b. Take 100 mg of the above product and place it in a round bottom flask, add 600 mg of aminosalicylic acid and 100 mL of 0.01 M sodium hydroxide solution, reflux at 80°C for 24 hours. After the reaction, stand still and cool, the product is centrifuged, washed, and vacuum-dried to obtain salicylic acid functionalized graphene.

[0036] (2) The salicylic acid functionalized graphene was prepared into a 0.5 mg / mL solution by ultrasonic dispersion;

[0037] (3) Take 5 μL of the above solution and drop-coat it on the surface of the glassy carbon electrode polished to a mirror surface, the diameter of the glassy carbon electrode is 3 mm;

[0038] (4) The electrode was made into a working electrode after drying at room temperature.

[0039] Detection process

[0040] (1) Test bottom fluid...

Embodiment 2

[0047] Electrode preparation process

[0048] (1) Preparation of salicylic acid functionalized graphene modified electrode;

[0049] a. Preparation of graphene oxide by Hummer method

[0050] b. Take 100 mg of the above product and place it in a round-bottomed flask, add 600 mg of aminosalicylic acid and 100 mL of 0.01 M sodium hydroxide solution, condense and reflux at 80° C. for 12 hours. After the reaction, stand still and cool, the product is centrifuged, washed, and vacuum-dried to obtain salicylic acid functionalized graphene.

[0051] (2) The salicylic acid functionalized graphene was prepared into a 1 mg / mL solution by ultrasonic dispersion;

[0052] (3) Take 5 μL of the above solution and drop-coat it on the surface of the glassy carbon electrode polished to a mirror surface, the diameter of the glassy carbon electrode is 2 mm;

[0053] (4) The electrode was made into a working electrode after drying at room temperature.

[0054] Detection process

[0055] (1) Te...

Embodiment 3

[0062] Electrode preparation process

[0063] (1) Preparation of salicylic acid functionalized graphene modified electrode;

[0064] a. Preparation of graphene oxide by Hummer method

[0065]b. Take 100 mg of the above product in a round-bottomed flask, add 300 mg of aminosalicylic acid and 100 mL of 0.01 M sodium hydroxide solution, condense and reflux at 80° C. for 24 hours. After the reaction, stand still and cool, the product is centrifuged, washed, and vacuum-dried to obtain salicylic acid functionalized graphene.

[0066] (2) The salicylic acid-functionalized graphene was prepared into a 0.2 mg / mL solution by ultrasonic dispersion;

[0067] (3) Take 10 μL of the above solution and drop-coat it on the surface of the glassy carbon electrode polished to a mirror surface, the diameter of the glassy carbon electrode is 4 mm;

[0068] (4) The electrode was made into a working electrode after drying at room temperature.

[0069] Detection process

[0070] (1) Test bottom l...

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Abstract

The invention provides a heavy metal ion electrochemical sensor detection method, and relates to a salicylic acid functionalized graphene modified electrode and a heavy metal detection method thereof, and belongs to the technical field of heavy metal detection and electrochemical analysis. The method specifically comprises the following steps that salicylic acid functionalized graphene is modified on the surface of a glassy carbon electrode so as to manufacture a sensor, and the heavy metal ions are detected by using an electrochemical differential pulse stripping voltammetry method. The method can be directly applied to rapid electrochemical detection on heavy metal ions, and has the advantages of high sensitivity, wide linear range, low detection limit and the like.

Description

technical field [0001] The invention relates to the technical field of heavy metal detection and electrochemical analysis, in particular to the preparation of a salicylic acid functionalized graphene-modified electrode and its heavy metal detection method. Background technique [0002] Heavy metals have great biological toxicity, and enrichment in the human body will cause great harm. Highly sensitive, rapid and accurate detection is the premise of heavy metal prevention and treatment, which has attracted strong attention of researchers at home and abroad. At present, conventional heavy metal detection techniques include graphite furnace atomic absorption spectrometry, flame atomic absorption spectrometry, atomic fluorescence spectrometry and so on. Among them, the flame atomic absorption method is easy to operate, fast in analysis speed, has little interference and stable signal when determining high-concentration elements, but the detection limit is high, which is not suit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 王会才赵修青姚晓霞马振华张金聪
Owner TIANJIN POLYTECHNIC UNIV
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