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Method for constructing photoelectric chemical sensor for mercury ion detection

A photoelectrochemical and construction method technology, applied in the field of photoelectrochemical sensor preparation, can solve problems such as affecting the sensitivity of photoelectrochemical detection, and achieve the effects of improving comprehensive analysis performance, easy operation, and increasing generation ratio.

Inactive Publication Date: 2015-06-10
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single semiconductor is easy to recombine with photogenerated electron pairs, which inhibits the generation of photoelectric signals and further affects the sensitivity of photoelectrochemical detection.

Method used

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  • Method for constructing photoelectric chemical sensor for mercury ion detection
  • Method for constructing photoelectric chemical sensor for mercury ion detection
  • Method for constructing photoelectric chemical sensor for mercury ion detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the detection method of the photoelectrochemical sensor that is used for mercury ion detection, as figure 1 shown, including the following steps:

[0027] (1) After polishing the glassy carbon electrode with a suspension of aluminum oxide with a particle size of 0.3 μm, it was cleaned with ethanol and pure water in sequence, and then left to dry at room temperature. 10 μL of perylene tetracarboxylic acid / graphene heterojunction suspension was drop-coated on the surface of the glassy carbon electrode and dried at room temperature to obtain a perylene tetracarboxylic acid / graphene heterojunction modified electrode.

[0028] The specific scheme for preparing perylenetetracarboxylic acid / graphene heterojunction is as follows: First, prepare 1×10 -4 mol L -1 DMF solution of perylenetetracarboxylic acid and 1 x 10 -2 mg mL -1 Graphene suspension, then take 10mL of perylenetetracarboxylic acid solution and 2mL of graphene suspension, mix and sonicate at room...

Embodiment 2

[0042] Embodiment 2: the detection method of the photoelectrochemical sensor that is used for mercury ion detection:

[0043] The specific scheme for preparing perylenetetracarboxylic acid / graphene heterojunction is as follows: First, prepare 0.5×10 -4 mol L -1 DMF solution of perylenetetracarboxylic acid and 0.5 x 10 -2 mg mL -1 Graphene suspension, then take 10mL of perylenetetracarboxylic acid solution and 2mL of graphene suspension, mix and sonicate at room temperature for 2 hours, then stir for another 2 hours and let stand overnight to generate perylenetetracarboxylic acid / graphene heterogeneous Knot.

[0044] After the glassy carbon electrode is polished with a 0.3 μm particle size aluminum oxide suspension, it is cleaned with ethanol and pure water in turn, and then placed at room temperature to dry. 10 μL of perylene tetracarboxylic acid / graphene heterojunction suspension was drop-coated on the surface of the glassy carbon electrode and dried at room temperature t...

Embodiment 3

[0046] Embodiment 3: the detection method of the photoelectrochemical sensor that is used for mercury ion detection:

[0047] The specific scheme for preparing perylenetetracarboxylic acid / graphene heterojunction is as follows: First, prepare 2×10 -4 mol L -1 DMF solution of perylenetetracarboxylic acid and 2 x 10 -2 mg mL -1 Graphene suspension, then take 10mL of perylenetetracarboxylic acid solution and 2mL of graphene suspension, mix and sonicate at room temperature for 1 hour, then stir for 1 hour and let stand overnight to generate perylenetetracarboxylic acid / graphene heterogeneous Knot.

[0048] After the glassy carbon electrode is polished with a 0.3 μm particle size aluminum oxide suspension, it is cleaned with ethanol and pure water in turn, and then placed at room temperature to dry. 10 μL of perylene tetracarboxylic acid / graphene heterojunction suspension was drop-coated on the surface of the glassy carbon electrode and dried at room temperature to obtain a per...

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Abstract

The invention discloses a method for constructing a photoelectric chemical sensor for mercury ion detection. The method comprises the following steps of: (1) cleaning a glassy carbon electrode, dispensing a photo-anode perylene tetracarboxylic / graphene heterojunction suspension on the surface of the glassy carbon electrode, and drying at room temperature; (2) fixing an aminated T base to the surface of the electrode subjected to EDC-NHS activated treatment; (3) dispensing to-be-detected mercury ions and interfering ions of different concentrations on different electrodes or on the surface of the same electrode in different times respectively; and (4) dispensing a mixed solution of hydroxylamine and chloroauric acid on the surface of the electrodes dispensed with the mercury ions, and forming nanogold on the surface of the electrode by utilizing catalysis of the mercury ions. The photoelectric chemical sensor prepared by the method has the characteristics of high ultra-sensitiveness, high specificity, low cost, simpleness and convenience in operation, easiness in carrying, low detection limit of 2pmolL<-1> and the like.

Description

technical field [0001] The invention relates to a preparation method of a photoelectrochemical sensor for detecting mercury ions, belonging to the field of chemical analysis and testing. Background technique [0002] Mercury ions are one of the common heavy metal pollutants, and their diffusion in the environment can lead to enrichment in human tissues and damage human tissues and organs. Currently, methods for detecting mercury ions include spectroscopic methods, chromatography methods, electrochemical methods, and immunoassay methods. However, each method has at least one of the following disadvantages, such as expensive equipment, complicated method, poor stability, time-consuming, low sensitivity, general selectivity and so on. Therefore, seeking a convenient, simple, ultra-sensitive, and highly specific mercury ion analysis method is one of the points of interest for analysts. [0003] Photoelectrochemical detection is a novel test method, which is based on the separa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
Inventor 李静李红波王伟高雷李威
Owner YANCHENG INST OF TECH
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