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Preparation and application of stabilizing probe for colorimetric detection of silver ions in seawater

A stabilized and seawater technology, applied in the measurement of color/spectral characteristics, analysis through chemical reactions of materials, and measurement devices, can solve problems such as low sensitivity and poor selectivity, and achieve high sensitivity, fast response time, and anti-corrosion. Disturbing effect

Active Publication Date: 2019-03-01
LUDONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another object of the present invention is to provide a method that can quickly and efficiently detect Ag in seawater. + The colorimetric detection method solves the problems of low sensitivity and poor selectivity of existing AuNPs-based colorimetric detection methods

Method used

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  • Preparation and application of stabilizing probe for colorimetric detection of silver ions in seawater
  • Preparation and application of stabilizing probe for colorimetric detection of silver ions in seawater

Examples

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Embodiment 1

[0025] Embodiment 1: the preparation of graphene oxide-hyperbranched polymer

[0026] Graphene oxide-hyperbranched polymer composites were prepared from graphene oxide and hyperbranched polymers. Graphene oxide and hyperbranched polymer were mixed in 20 mL N,N-dimethylformamide at a mass ratio of 2:1, stirred and refluxed for 24 h; then, the mixture was filtered and washed several times with ethanol ; The product was vacuum-dried at 40 °C for 24 h to obtain a graphene oxide-hyperbranched polymer composite.

Embodiment 2

[0027] Example 2: Preparation of graphene oxide-hyperbranched polymer stabilized AuNPs

[0028] Take 20 mL of 0.15 mM chloroauric acid (AuCl 3 ·HCl·4H 2 O) Heat the aqueous solution to boil, add 0.4 mL 0.25-2.45 mg / mL graphene oxide-hyperbranched polymer aqueous solution, mix the solution and react for 20 min until the solution turns red; finally, cool the mixed solution and let it stand to obtain graphene oxide - Stabilization of AuNPs by hyperbranched polymers.

Embodiment 3

[0029] Example 3: Construction of colorimetric detection method and investigation of detection sensitivity

[0030] In the present invention, graphene oxide-hyperbranched polymer stabilized AuNPs are used as detection probes to detect Ag in seawater systems. + The presence. During the detection process, when there is Ag + At this time, it can be observed by the naked eye that the detection system will change from the original light red to yellow, and the characteristic absorption peak of the ultraviolet absorption spectrum will be blue-shifted, so as to realize the detection of Ag in seawater. + colorimetric detection. Take 0-2.0 mL 3.94×10 -4 Ag of M + Seawater solution and 0.5 mL of 100 mg / mL ascorbic acid in seawater solution were added to 0.10-1.50 mL 0.15 mM graphene oxide-hyperbranched polymer stabilized AuNPs solution, and the final volume of the detection system was 4.5 mL, and the color and UV Absorption spectrum changes to examine the colorimetric probe for Ag ...

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Abstract

The invention discloses a method for colorimetric detection of silver ions (Ag+) in seawater based on graphene oxide hyperbranched polymer and stabilizing gold nanoparticles (AuNPs). The colorimetricprobe is prepared by reducing the graphene oxide hyperbranched polymer and stabilizing AuNPs. In the detection process, dual responses of color changing from red to yellow in the seawater system and the blue shifting of the ultraviolet absorption spectrum occur when the surface plasmon resonance property of AuNPs is utilized and the Ag+ exists. The Ag+ detection range of the colorimetric probe inseawater is 0-0.132 mm, and the lowest detection concentration is 0.44micrometre. The invented colorimetric probe has the advantages of simple preparation, good stability and the like, can realize highly sensitive, highly selective, and rapid detection of Ag+ in a seawater system with complex components and high salinity, and has wide application prospect.

Description

technical field [0001] The invention relates to the field of detection of heavy metal ions in seawater, in particular to a method for preparing stabilized AuNPs and Ag in seawater. + colorimetric detection method. Background technique [0002] In recent years, with the development of industrial economy, the discharge of industrial wastewater and domestic sewage has made the pollution of heavy metal ions in seawater more and more serious, which has had a huge impact on the development of my country's marine industry. Among them, silver ions (Ag + ) Although it has high electrical and thermal conductivity, ductility and photosensitivity, it is widely used in photography, imaging, electrical appliances, medicine and other fields. But Ag + It is extremely destructive to marine ecosystems and food chains, and can eventually be enriched in the human body through the food chain, and can combine with functional groups such as amines, imidazoles, and carboxyl groups of various met...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31G01N21/33G01N21/552
CPCG01N21/31G01N21/33G01N21/554G01N21/78
Inventor 刘训恿朱晨雪刘毅刘军深戴雨晴夏云霞高学珍
Owner LUDONG UNIVERSITY
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