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Mercury ion probe as well as preparation method and application thereof

A mercury ion and probe technology, applied in the field of organic molecular analysis and detection, can solve the problems of high detection cost, high detection limit, low sensitivity, etc., and achieve the effect of wide linear range, high detection and high sensitivity

Active Publication Date: 2017-08-18
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The methods for detecting mercury ions in the prior art include fluorescence, atomic emission methods, ICP-MS, etc., but these methods have higher detection limits and narrower detection ranges, and cannot meet the requirements of EPA and WHO; the comparison of sample pretreatment steps Complicated, high detection cost; low sensitivity, unable to remove mercury ions from the solution and other limitations
The methods that can remove mercury ions in the prior art have a long response time, so that the purpose of removing mercury ions in the true sense cannot be achieved
Furthermore, there is no literature reporting the ability to remove mercury ions from solution while detecting lower concentrations

Method used

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  • Mercury ion probe as well as preparation method and application thereof
  • Mercury ion probe as well as preparation method and application thereof
  • Mercury ion probe as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0081] The preparation of embodiment 1 mercury ion probe GC / HD / AuNS / PT+MB

[0082] First use 0.1 and 0.05μm Al 2 o 3 The surface of the glassy carbon electrode was polished with powder, then ultrasonically rinsed in acetone and water, and dried with nitrogen. The glassy carbon electrode was then immersed in 5 mM HAuCl electrochemically 4 The solution was deposited at -0.2V (Ag / AgCl as a reference electrode) for 180s to obtain GC / Au, and the Au / GC electrode was immersed in 50mM 1,6-hexanedithiol (1,6-hexanedithiol) for 12h, and then used The excess 1,6-hexanedithiol was washed away with ethanol, and then the surface of the electrode was blown dry with nitrogen to obtain a GC / HD electrode. Then soak the GC / HD electrode in the above-mentioned synthesized nano gold sphere solution for 12h to obtain the GC / HD / AuNS electrode, then put the GC / HD / AuNS electrode into the 1mM PT solution and add EDC and NHS as a catalyst, The obtained GC / HD / AuNS / PT electrode was immersed in 25 μM HS...

Embodiment 2

[0085] Example 2 Determination and removal of mercury ions by probe GC / HD / AuNS / PT+MB

[0086] The mercury ion probe GC / HD / AuNS / PT+MB prepared by the present invention is used as the working electrode, and square wave voltammetry is used to record the current signals under different mercury ion concentrations, and the current value generated by the mercury ion and the current value generated by the MB are obtained. A linear relationship between the ratio of the resulting current value and the concentration of mercury ions.

[0087] The corresponding linear relationship equation is: E=1.266C+0.064.

[0088] At the same time, the current signals at different times were recorded, and the removal efficiency of mercury ions was calculated. Figure 10 When the mercury ion probe GC / HD / AuNS / PT+MB prepared for Example 1 of the present invention measures mercury ions with an initial concentration of 1 μM, the corresponding SWV current response signal diagrams at different times, where a...

Embodiment 3

[0090] Example 3 Detection of Mercury Ion Concentration in Huangpu River Water Sample and Its Removal

[0091] (1) Electrochemical method to detect mercury ions

[0092] Using mercury ion probe GC / HD / AuNS / PT+MB as the working electrode, the potential was swept from 0.8V to -0.4V in 0.1M PBS (pH=7.4) solution by square wave voltammetry, and recorded at different mercury ion The current signal at the concentration. Obtain the linear relationship between the ratio of the current value produced by mercury ions to the current value produced by MB and the concentration of mercury ions; E=1.266C+0.064, where E is J p / J p R , C is the concentration of mercury ions in μM.

[0093] (2) Detect the concentration of mercury ions in Huangpu River water samples and remove them

[0094] First filter the Huangpu River water sample, take 5mL water sample, adjust the pH=7.4, then use square wave voltammetry, measure the current after 7 minutes, and get the mercury ion concentration of 2.67...

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Abstract

The invention discloses a mercury ion probe GC / HD / AuNS / PT+MB and a preparation method thereof. The method comprises the following steps: firstly, compounding organic functional molecule phenylthiourea PT specifically recognizing and combining with mercury ions, modifying onto an electrode, and adopting a method for electrically depositing gold and nanometer gold ball amplifying signals, thereby acquiring the mercury ion probe GC / HD / AuNS / PT+MB. The invention also provides an application of the mercury ion probe GC / HD / AuNS / PT+MB in detecting mercury ions. The mercury ion probe disclosed by the invention has the advantages of high sensitivity, high accuracy, high selectivity and low detection limit, the detection for mercury ions can be realized, the purpose of effectively removing mercury ions can be achieved, and thus the application prospect is wide.

Description

technical field [0001] The invention belongs to the analysis and detection technology of organic molecules, and relates to an organic small molecule mercury ion probe for specifically identifying and detecting mercury ions in water samples. Background technique [0002] As a heavy metal ion that is toxic to the environment and organisms, mercury ions not only cause serious damage to the human digestive system, nervous system, liver and other organs, especially to pregnant women and fetuses, even at very low concentrations can also cause serious damage. The U.S. Environmental Protection Agency (EPA) and the World Health Organization (WHO) stipulate that the concentration of mercury ions that can be detected in drinking water must be less than 2ppb. However, real-time determination of low-concentration mercury ions in complex environments and biological systems is still a huge challenge. In addition, mercury pollution is also very serious. In order to deal with mercury pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C335/16G01N27/26C02F1/46C02F101/20
CPCC02F1/46C02F2101/20C07C335/16G01N27/26
Inventor 田阳马荣励
Owner EAST CHINA NORMAL UNIV
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