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Paper sensor for rapid on-site detection of fluorine ions in water and preparation method thereof

A field detection and sensor technology, applied in instruments, measuring devices, scientific instruments, etc., to achieve remarkable effects, stable luminescence properties, and simple operation.

Inactive Publication Date: 2016-08-10
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, luminescent graphene oxide has not been reported for the visual detection of fluoride ions

Method used

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  • Paper sensor for rapid on-site detection of fluorine ions in water and preparation method thereof
  • Paper sensor for rapid on-site detection of fluorine ions in water and preparation method thereof
  • Paper sensor for rapid on-site detection of fluorine ions in water and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, the preparation of paper sensor

[0040] The paper sensor of the present embodiment is based on a filter membrane, and is printed with a membrane-based sensor with evenly distributed fluorescent nanoprobes on the filter membrane; figure 1 As shown, the fluorescent nanoprobe is based on the resonance energy transfer effect, so that the luminescent graphene oxide and silver nanoparticles are specifically combined in the form of boronate bonds through surface functional modification, thereby forming a fluorescent nanoprobe; F - The ions can destroy the specific binding of the borate bond, so that the silver nanoparticles are far away from the luminescent graphene oxide, the fluorescence of the probe system is restored, and the F - ion detection.

[0041] The preparation method of the paper sensor in this embodiment is as follows:

[0042] Step 1, preparation of luminescent graphene oxide:

[0043] (1) Heat 30mL concentrated sulfuric acid to 90°C, add 1g K ...

Embodiment 2

[0062] Embodiment 2, detect F with nanometer fluorescence sensor -

[0063] (1) Add 300 μL of the MPBA-AgNPs solution prepared in Step 4 of Example 1 dropwise to 1 mL of the 3-amino-1,2-propanediol-modified GO-glycine solution (1.0 mg / mL) prepared in Step 3 of Example 1 Add dropwise for 1 h to obtain a nano fluorescent probe solution. 3-Amino-1,2-propanediol-modified GO-glycine was quenched by MPBA-AgNPs to a large extent due to resonance energy transfer. In this embodiment, the fluorescence intensity of the 3-amino-1,2 propanediol-modified GO-glycine solution was measured when the concentration of MPBA-AgNPs was gradually increased. The fluorescence quenching spectra of MPBA-AgNPs added to 3-amino-1,2-propanediol-modified GO-glycine solution are shown in image 3 . It can be seen from the figure that after adding 0.129nM MPBA-AgNPs, the fluorescence of GO-glycine modified by 3-amino-1,2 propanediol was quenched by about 95%, and reached equilibrium, 3-amino-1,2 propanedio...

Embodiment 3

[0068] Embodiment 3, selectivity experiment

[0069] (1) Add 300 μL of the MPBA-AgNPs solution (concentration: 0.129 nM) prepared in Step 4 of Example 1 dropwise to 1 mL of the 3-amino-1,2-propanediol-modified GO-glycine solution prepared in Step 3 of Example 1 (1.0mg / mL) was added dropwise for 1h to obtain a nano fluorescent probe solution. 100 μL of 0.10 M PBS buffer (pH=7.4) was added to the probe solution.

[0070] (2) Add 0.55nM Cl at room temperature and shaking conditions - ,Br - , I - , HCO 3 - ,CH 3 COO - ,CO 3 2- ,HPO 4 2- ,NO 3 - and SO 4 2- Solution, react for 30min;

[0071] (3) Measure the fluorescence of the probe with a fluorescence detector, see the selectivity results Figure 6 , Figure 7 . It can be seen from the figure that among all the anions in the experiment, only fluoride ion can greatly restore the fluorescence of the nano-fluorescent probe, while other anions have almost no effect on the nano-fluorescent probe. Therefore, the nan...

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Abstract

The invention discloses a paper sensor for rapid on-site detection of fluorine ions in water and a preparation method thereof, and is characterized in that the paper sensor is a membrane based sensor with a filter membrane as a substrate, wherein the filter membrane is printed with uniformly distributed fluorescent nanoprobes; the fluorescent nanoprobes are prepared by making luminous graphene oxide and silver nanoparticles specifically combined in a manner of borate bonds through surface functionalization modification according to the effect of resonance energy transfer, so as to form the fluorescent nanoprobes; F<-> can destroy the specific combination of the borate bonds, so that silver nanoparticles are away from luminous graphene oxide, the probe system fluorescence is recovered, and thus F<-> is detected. The paper sensor aims at the deficiency of the prior art, can achieve rapid on-site visual detection of the fluorine ions in an environmental water body; the preparation method has the advantages of simple operation and low cost, can be completed in general chemistry laboratories, is easy to popularize, and has broad application prospects in environmental detection and protection and many other fields.

Description

technical field [0001] The invention relates to a fluorescent paper sensor, in particular to a paper sensor for rapid on-site detection of fluorine ions in water and a preparation method thereof. Background technique [0002] In recent years, many people in the world still drink high-fluoride water, and endemic fluorosis incidents have gradually attracted the attention of countries all over the world. Fluorine pollution is mainly reflected in high-fluorine water, and the causes of high-fluorine water mainly include natural and human factors. The natural factor is that fluoride is easily soluble in water and forms fluoride ions in water, so it dissolves after groundwater erosion, resulting in fluorine pollution of surface water and groundwater. At the same time, fluoride is also one of the main anions in atmospheric precipitation. The human factor is that in the development of modern industry, the waste water discharged from the production and processing of chemical raw mate...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/643G01N2021/6432
Inventor 蒋长龙张忠平陈晓春
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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