A thin film for portable fluorescence detection of heavy metal ions in water and its preparation method

A technology for heavy metal ion and fluorescence detection, applied in the field of fluorescence detection, can solve the problems of limited practical application, low mechanical strength, complex preparation process of thin films, etc., and achieve the effects of accelerated diffusion and penetration, simplified detection process, and simple preparation process.

Active Publication Date: 2022-05-10
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

The complex preparation process and low mechanical strength of the film limit its practical application in the field of heavy metal ion fluorescence sensing

Method used

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  • A thin film for portable fluorescence detection of heavy metal ions in water and its preparation method

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Effect test

Embodiment 1

[0027] Cr in the present embodiment is used in water body 2 o 7 2- The thin film for portable fluorescence detection adopts 85 parts by weight of column chromatography silica gel with a particle size of 50 μm, 10 parts by weight of zinc with a particle size of 500 nm, 2,5-diaminoterephthalic acid, 4,4'-linked A metal-organic framework material formed by pyridine coordination and 5 parts by weight of sodium carboxymethyl cellulose is prepared. The specific preparation method is:

[0028] (1) Preparation of MOFs: 29.8 mg of zinc nitrate, 18.1 mg of 2,5-diaminoterephthalic acid and 15.6 mg of 4,4'-bipyridine were dissolved in 3 mL of DMF and 3 mL of H 2 O mixed solvent, followed by adding 100 μL of nitric acid. The solution was packaged in a 20mL reactor liner and placed in an oven at 60°C for 24h. Cooled to room temperature, washed 3 times with DMF, obtained for the detection of Cr 2 o 7 2- metal organic framework materials.

[0029] (2) Preparation of metal-organic fra...

Embodiment 2

[0033] The present embodiment is used for Hg in water body 2+ The film for portable fluorescence detection adopts 90 parts by weight of column chromatography silica gel with a particle diameter of 80 μm, 5 parts by weight of cadmium with a particle diameter of 1000 nm and N2, N4, N6-tris (pyridin-4-yl) melamine coordination The formed metal organic framework material and 5 parts by weight of polyvinyl alcohol were prepared.

[0034] The specific preparation method is:

[0035] (1) Preparation of MOFs: 30 mg of cadmium nitrate and 19.44 mg of N2,N4,N6-tris(pyridin-4-yl)melamine were dissolved in 5 mL of DMA and 1 mL of H 2 O mixed solvent, followed by adding 500 μL acetic acid. The solution was packaged in a 20mL reactor liner and placed in an oven at 100°C for 48h. Cooled to room temperature, washed 3 times with DMA, obtained for the detection of Hg 2+ metal organic framework materials.

[0036] (2) Preparation of metal-organic framework material and silica gel mixture: m...

Embodiment 3

[0040] The present embodiment is used for Pb in water body 2+ The thin film for portable fluorescence detection adopts 90 parts by weight of column chromatography silica gel with a particle size of 100 μm, 9 parts by weight of europium with a particle size of 1500 nm and 4,4',4"-(phenyl-1,3,5 -trioxo)-benzoic acid coordination metal organic framework material and 1 weight part of polyvinylpyrrolidone are prepared. The specific preparation method is:

[0041] (1) Preparation of metal organic framework materials: 44.6 mg of europium nitrate, 74.5 mg of 4,4',4"-(phenyl-1,3,5-trioxo)-benzoic acid were dissolved in 2 mL of DMF and 5mL H 2 O mixed solvent, followed by adding 1000 μL hydrochloric acid. The solution was packaged in a 20mL reactor liner and placed in an oven at 150°C for 72h. Cooled to room temperature, washed 3 times with DMF, obtained for the detection of Pb 2+ metal organic framework materials.

[0042] (2) Preparation of metal-organic framework material and si...

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Abstract

The invention discloses a thin film for portable fluorescence detection of heavy metal ions in water bodies and a preparation method thereof. The thin film used for portable fluorescence detection of heavy metal ions in water is prepared by using silica gel with strong water absorption capacity, metal organic framework material and binder. The preparation method comprises the following steps: mixing silica gel, binder and water to obtain an emulsion, adding a metal-organic framework material therein, stirring evenly, taking an appropriate amount of the mixture on the surface of a glass slide, and scraping with a coating rod, After drying, a thin film for portable fluorescence detection of heavy metal ions in water can be obtained. The film prepared by the present invention takes a short time to detect heavy metal ions, has high detection sensitivity, and has the characteristics of low preparation cost and economical application while having a certain use strength. It can be used in combination with a hand-held fluorescence spectrometer to realize detection of heavy metal ions in water bodies. On-site real-time detection of heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of fluorescence detection, and relates to a film used for portable fluorescence detection of heavy metal ions in water bodies and a preparation method thereof. Background technique [0002] Heavy metal pollution is a serious environmental problem worldwide. In industrial production, heavy metal elements are usually discharged into the environment in the form of ions along with industrial wastewater. Even exposure to extremely low concentrations can threaten human health and cause various diseases. At the same time, heavy metal elements are non-degradable substances, and excessive accumulation in the environment and in organisms can lead to fatal problems such as gene mutations and cancer. Chromium, mercury, and lead are heavy metal elements commonly used in industry. Chromium is widely used in various industrial productions such as metallurgy, electroplating, and fuel combustion. Chromium waste is usually in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02G01N21/64
CPCC09K11/02G01N21/643
Inventor 崔元靖张舒云钱国栋杨雨
Owner ZHEJIANG UNIV
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