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Method for separating and detecting paraquat based on nano channel

A gold nanochannel and paraquat technology, applied in the field of materials, can solve the problems of complicated pesticide operation, difficult to carry instruments, and limitations, and achieve the effects of being beneficial to detection, eliminating interference and simple separation process

Inactive Publication Date: 2011-11-02
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are complicated to detect pesticides, and the instruments are not easy to carry, which are limited in continuous monitoring and on-site determination

Method used

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  • Method for separating and detecting paraquat based on nano channel
  • Method for separating and detecting paraquat based on nano channel
  • Method for separating and detecting paraquat based on nano channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 Preparation of gold nanochannel array film

[0027] Gold was deposited on a 100 nm porous polycarbonate (PC) film by electroless deposition.

[0028] Immerse the PC membrane in anhydrous methanol for 30min to wash away the impurities adsorbed on the base membrane; then immerse the cleaned PC membrane in 0.025M SnCl 2 The solution was shaken at room temperature for 45min at a speed of 150 rpm to make the Sn 2+ Uniformly adsorbed on the surface of the basement membrane and membrane pores, taken out in N 2 Purging with methanol 3 times under air environment;

[0029] in N 2 The film was immersed in 0.029M Ag(NH 3 ) 2 + In the solution for 15 minutes, take it out and wash it with methanol for 3 times, and wash it with water for 3 times, and the immersion concentration is 7.9×10 -4 In M sodium gold sulfite deposition solution (pH = 10.00), after electroless gold plating at 4°C for 8.5 hours, take it out and wash it with water for 3 times, and then use 25%...

Embodiment 2

[0031] Embodiment 2 Determination of Atrazine and Paraquat Separation Effect

[0032] A U-shaped pool (the material is polytetrafluoroethylene) is used as a device for separating paraquat and atrazine. The U-shaped pool is divided into two parts: the sampling pool and the permeation pool, and the sampling pool and the permeation pool are respectively connected to the electrochemical workstation. . The gold nanochannel membrane obtained in Example 1 is placed in the middle of the sample injection tank and the permeation tank, and the effective permeation area of ​​the membrane is 0.196 cm 2 , Add a constant voltage of 3V at both ends.

[0033] Dissolve sodium chloride, paraquat and atrazine in water to prepare a concentration of 0.03mol / L sodium chloride, 1.55×10 -5 mol / L paraquat and 1.55×10 -5mol / L mixed solution of atrazine. Add 3ml of the above mixed solution into the sampling pool of the U-shaped connecting pool, add 3mL of pure water into the permeation tank, and use ...

Embodiment 3

[0036] The mensuration of embodiment 3 paraquat

[0037] The U-shaped pool is adopted as the device for separation of atrazine and paraquat. The U-shaped pool is divided into two parts, the sample pool and the permeation pool. The gold nanochannel membrane obtained in Example 1 is placed in the middle of the sample pool and the permeation pool. The effective transmission area is 0.196cm 2 , Add a constant voltage of 3V at both ends.

[0038] Add 3ml of paraquat sample solution containing 0.03mol / L sodium chloride (concentrations are 7.8×10 -6 , 1.55×10 -5 , 3.1×10 -5 , 6.2×10 -5 , 7.75×10 -5 , 1.55×10 -4 , 3.1×10 -4 , 4.6×10 -4 , 6.2×10 -4 mol / L), add 3ml of pure water in the osmosis tank, and detect the concentration of paraquat in the osmosis tank with ultraviolet light after 120 minutes.

[0039] The result shows that after 120 minutes, the concentration of paraquat in the permeation tank and the concentration of paraquat in the injection tank are 7.8×10 -6 ~6.2×...

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Abstract

The invention relates to a method for separating and detecting paraquat. The method comprises the following steps of: putting a gold nano channel membrane between a feeding tank and an infiltration tank of a u-shaped tank; putting strong electrolyte solution which contains a sample to be detected and has the ionic strength of between 0.01 and 0.1M into the feeding tank, and adding equivalent purewater into the infiltration tank; adding 1 to 10V of constant voltage between the feeding tank and the infiltration tank of the u-shaped tank; and detecting the concentration of the paraquat in the infiltration tank by using ultraviolet after 30 to 120 minutes. In the method, a gold nano channel membrane is prepared by a chemical deposition method on the basis of a gold nano channel membrane technology, and the effects of hydrophilcity and electrophoresis of a channel contribute to the passing of the ionic paraquat but do not contribute to the passing of atrazine molecules under the conditionof external driving force and the constant voltage. By the method, the paraquat can be separated from the atrazine molecules. The separation process is simple, the interference of atrazine is eliminated, and the detection of the atrazine is facilitated; and the method has a good application prospect.

Description

technical field [0001] The invention relates to the field of materials and sensing technology, and relates to a molecular-level membrane separation detection technology based on nano-channel membrane materials, specifically a method for separating and detecting paraquat and atrazine. Background technique [0002] In recent years, nanoscience and technology have developed rapidly, and its research objects involve many fields, resulting in many emerging topics and directions. As a new growth point and one of the important contents of bionanotechnology research, nanochannel provides a new technical platform for the effective separation and detection of chemical and biological components. Due to the characteristics of large specific surface area and controllable size effect of nanochannel membranes, nanochannels have been widely used in the fields of separation and detection of biological substances. Under the condition of voltage application, the surface of the gold nanochanne...

Claims

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Application Information

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IPC IPC(8): G01N30/08B82Y40/00
Inventor 黄杉生史汶灵
Owner SHANGHAI NORMAL UNIVERSITY
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