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Preparation method and application of TiS2 nanosheet-polyaniline-based electrochemical sensor for trace copper ion detection

A copper ion detection, polyaniline-based technology, applied in the field of environmental analysis, can solve the problems of harsh detection conditions, insufficient sensitivity and selectivity, secondary pollution, etc., and achieve the effects of high selectivity, high sensitivity and low noise value.

Active Publication Date: 2015-04-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sensing elements (probes) in the currently reported sensors have at least one of the following disadvantages: easy to cause secondary pollution, harsh detection conditions, insufficient sensitivity and selectivity
This is because these sensors mainly use organic matter or biomolecules to construct copper ion probes, and there are secondary pollution problems in the preparation and use of copper ion probes based on organic matter, while biomolecules (such as enzymes, aptamers, antibodies, etc.) ) constructed copper ion probe, which has strict requirements on the pH and temperature of the detection environment

Method used

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  • Preparation method and application of TiS2 nanosheet-polyaniline-based electrochemical sensor for trace copper ion detection
  • Preparation method and application of TiS2 nanosheet-polyaniline-based electrochemical sensor for trace copper ion detection
  • Preparation method and application of TiS2 nanosheet-polyaniline-based electrochemical sensor for trace copper ion detection

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A TiS for Trace Copper Ion Detection 2 Nanosheet-polyaniline-based electrochemical sensor, the construction process is as follows figure 1 shown, including the following steps:

[0038] (1) 15mg bulk TiS 2 Add 4.5mL of 0.278M n-butyllithium solution diluted with n-hexane, react in an anhydrous and oxygen-free environment at 60°C for 12h, filter and wash with anhydrous methanol and n-hexane in turn to obtain lithium intercalated TiS 2 , which is Li x TiS 2 .

[0039] (2) Take a certain amount of Li obtained in step (1) x TiS 2 Added to deionized water after deoxygenation, in which 1mg Li x TiS 2 Add 2 mL of deionized water; then in an ice-water bath with N 2 Ultrasonic peeling in a protected environment for 1 hour, and separation in a centrifuge at a speed of 2500r / min for 20 minutes, the obtained supernatant is high-quality TiS 2 Nanosheets.

[0040] (3) A certain amount of TiS 2 Nanosheets were added to 10mL of mixed solution containing 0.3M aniline and 0....

Embodiment 2

[0054] A TiS for Trace Copper Ion Detection 2 Nanosheet-polyaniline-based electrochemical sensor, the construction process is as follows figure 1 shown, including the following steps:

[0055] (1) 42mg block TiS 2 Add it to 10mL of 0.4M n-butyllithium n-hexane solution, react in an anhydrous and oxygen-free environment at 65°C for 15h, filter and wash with anhydrous methanol and n-hexane in turn to obtain lithium-intercalated TiS 2 , which is Li x TiS 2 .

[0056] (2) Take a certain amount of Li obtained in step (1) x TiS 2 Added to deionized water after deoxygenation, in which 1mg Li x TiS 2 Add 4 mL of deionized water; then in an ice-water bath with N 2 Ultrasonic peeling in a protected environment for 1 hour, and separation in a centrifuge at a speed of 3000r / min for 25 minutes, the obtained supernatant is TiS 2 Nanosheets.

[0057] (3) A certain amount of TiS 2 Nanosheets were added to 10mL of mixed solution containing 0.3M aniline and 0.1M HCl, ultrasonicated ...

Embodiment 3

[0066] A TiS for Trace Copper Ion Detection 2 Nanosheet-polyaniline-based electrochemical sensor, the construction process is as follows figure 1 shown, including the following steps:

[0067] (1) 27mg block TiS 2 Add it to 6mL of 0.3M n-butyllithium n-hexane solution, react in an anhydrous and oxygen-free environment at 60°C for 12h, filter and wash with anhydrous methanol and n-hexane in sequence to obtain lithium-intercalated TiS 2 , which is Li x TiS 2 .

[0068] (2) Take a certain amount of Li obtained in step (1) x TiS 2 Added to deionized water after deoxygenation, in which 1mg Li x TiS 2 Add 2 mL of deionized water; then in an ice-water bath with N 2 Ultrasonic peeling in a protected environment for 1 hour, and separation in a centrifuge at a speed of 2500r / min for 30 minutes, the obtained supernatant is TiS 2 Nanosheets.

[0069] (3) A certain amount of TiS 2 Nanosheets were added to 10mL of mixed solution containing 0.3M aniline and 0.1M HCl, ultrasonicat...

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Abstract

The invention discloses a preparation method and application of a TiS2 nanosheet-polyaniline-based electrochemical sensor for trace copper ion detection, belonging to the field of environmental analysis. By utilizing high selectivity obtained by a complexing effect of nitrogen atoms and copper ions on imidogen in polyaniline and high conductivity of the TiS2 nanosheets, a signal amplification effect is achieved, and trace copper ion detection is realized. Due to the presence of the TiS2 nanosheets, the stability and the interface electron transfer rate of the sensor can be enhanced. According to the synergistic effect of the TiS2 nanosheets and polyaniline, the TiS2 nanosheet-polyaniline-based electrochemical sensing method has the characteristics of high sensitivity, high selectivity and the like, the detection linearity range of copper ions is 25 microns-5 microns, the detection limit is 0.7nM, the method for preparing the TiS2 nanosheet-polyaniline-based electrochemical sensor is controllable, and secondary pollution is avoided. The electrochemical sensor disclosed by the invention has wide application prospects of monitoring copper ions in the water body in situ in real time.

Description

technical field [0001] The invention belongs to the field of environmental analysis and relates to a TiS used for the detection of trace copper ions 2 Preparation method and application of nanosheet-polyaniline-based electrochemical sensor. Background technique [0002] As a non-essential element, heavy metal ions can cause permanent damage to human tissues and internal organs. As far as its toxicity is concerned, even at low concentrations, long-term exposure to it can produce heritable toxicity. Although copper ions play an important role in human biochemical reactions, long-term exposure to high concentrations of copper sources can lead to Alzheimer's disease, Parkinson's disease, Wilson's disease and prion disease, so new and simple detection methods were developed to efficiently It is a very meaningful work to detect trace copper ions. [0003] Traditional copper ion detection methods mainly include atomic absorption or emission spectroscopy, fluorescence analysis, i...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/38
Inventor 赵慧敏甘小荣全燮陈硕于洪涛
Owner DALIAN UNIV OF TECH
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