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.
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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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