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Application of nano fluorescent probe SiO2 (at) Tb in detection of Fe < 3 + > in water body

A nano-fluorescent probe and water body technology, which is applied in the direction of fluorescence/phosphorescence, color/spectral characteristic measurement, and measurement devices, can solve the problems of being easily affected by the environmental background, achieve good selectivity and sensitivity, and be easy to operate. The effect of simple equipment

Pending Publication Date: 2022-05-27
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be pointed out that the fluorescent probes currently used to detect iron ions, such as metal-organic framework materials (MOF), quantum dots, etc., are all non-ratio-type fluorescent probes, but these probes are easily affected by the environmental background during detection. Impact

Method used

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  • Application of nano fluorescent probe SiO2 (at) Tb in detection of Fe &lt; 3 + &gt; in water body
  • Application of nano fluorescent probe SiO2 (at) Tb in detection of Fe &lt; 3 + &gt; in water body
  • Application of nano fluorescent probe SiO2 (at) Tb in detection of Fe &lt; 3 + &gt; in water body

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Provide a ratiometric fluorescent probe SiO 2 The preparation of @Tb includes the following steps:

[0040] 1) Put 0.5 g of nano-SiO with a particle size of 9 nm 2 It was dispersed in 50 mL of ethanol by ultrasonic, and then 0.1 mL of 3-aminopropyl triethoxysilane (APTES) was added to react for 24 h. After the reaction is completed, the obtained product is centrifuged at high speed to obtain amino-modified silica nanoparticles (SiO 2 @NH 2 ).

[0041] 2) ultrasonically disperse the obtained amino-modified silica nanoparticles in 50 mL of tetrahydrofuran, add 0.1 g of trimellitic anhydride (TMA), stir and react for 8 h at room temperature, centrifuge the product at high speed, and wash with tetrahydrofuran and ethanol solution , to remove unreacted TMA to obtain carboxyl-modified silica nanoparticles (SiO 2 @COOH).

[0042] 3) ultrasonically disperse the carboxyl-modified silica nanoparticles obtained above in 30 mL of ethanol, drop an appropriate amount of triethy...

Embodiment 2

[0043] Example 2: Selectivity experiment

[0044] 1) Preparation of sample suspension: the nano-fluorescent probe SiO prepared in Example 1 was 2 @Tb (1 mg) was ultrasonically dispersed in 10 mL of deionized water to obtain uniformly dispersed SiO 2 @Tb suspension.

[0045] 2) Prepare aqueous solutions of different metal cations with a concentration of 0.01M respectively, and the cations are Fe 3+ , Na + , K + , Ba 2+ , Mg 2+ , Ca 2+ , Fe 2+ , Mn 2+ , Co 2+ .

[0046] 3) Detection method: take the SiO prepared in 1) for each 2 Put 2 mL of @Tb suspension in a cuvette, add the aqueous solutions (0.01 M, 20 μL) of different metal cations prepared in step 2), turn on the fluorescence spectrometer, and record the fluorescence emission spectrum under the excitation of ultraviolet light with a wavelength of 237 nm. The spectral data were analyzed, and the fluorescence intensity I at 545 nm and 461 nm was obtained from the emission spectrum 545 , I 461 , find I 545 / I ...

Embodiment 3

[0048] Example 3: Titration experiment to obtain working curve

[0049] 1) SiO 2 Preparation of @Tb Suspension: Same as Example 2.

[0050] 2) Prepare Fe with a concentration of 0.1 mM 3+ solution.

[0051] 3) Titration experiment: take the SiO prepared in 1) 2 Put 2.0 mL of @Tb suspension in a cuvette, turn on the fluorescence spectrometer, and record the emission spectrum under the excitation of ultraviolet light. Then add 20 μL, 20 μL, 20 μL, 20 μL, 20 μL, 20 μL, 40 μL, 40 μL, 40 μL, 40 μL, 40 μL Fe 3+ Aqueous solution (0.1mM), mix well, use 237nm excitation wavelength for excitation and record luminescence emission spectrum, record SiO 2 @Tb suspension fluorescence intensity and calculate I 545 / I 461 ratio to I 545 / I 461 The ratio of Fe to Fe 3+ The concentration of , and the data are fitted to obtain the linear equation (2):

[0052] y=8.74886-0.35993[C] (2)

[0053] where, y: fluorescence emission intensity I 545 / I 461 Ratio; [C]:Fe 3+ content.

[0054...

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Abstract

The invention discloses an application of a nano fluorescent probe SiO2 (at) Tb in detection of Fe < 3 + > in a water body. Fluorescence emission of a silicon dioxide matrix in the nanometer fluorescent probe SiO2 (at) Tb is used as a reference, characteristic emission fluorescence of rare earth terbium ions is quenched by Fe < 3 + >, a ratio type fluorescent probe is constructed, and the ratio type fluorescent probe has a self-reference characteristic, can effectively reduce system errors, and has the advantages of high selectivity and sensitivity, strong anti-interference capability, low requirements on a detection environment, high accuracy and low detection limit; the density is only 0.0752 [mu] M; meanwhile, instruments and equipment are simple, operation is convenient, and potential application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of detection of metal ions in water, and in particular relates to a silicon dioxide / terbium nano hybrid material (SiO 2 @Tb) is a ratiometric fluorescent probe, which can detect trace Fe in water by fluorescence 3+ content. Background technique [0002] Today, heavy metal wastewater pollution has become one of the important ways of water pollution in the world, and has become an urgent problem that plagues public health. With the continuous development of my country's economy, various heavy metal-containing materials are widely used in various production, processing and manufacturing industries, and are discharged into the environment along with industrial wastewater. Heavy metals are highly permeable in the environment and can accumulate continuously through food chain enrichment. They are difficult to be treated harmlessly, and their spontaneous degradation is very slow, posing a serious threat to the he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G01N21/33
CPCG01N21/64G01N21/6428G01N21/33G01N2021/6432Y02A20/20
Inventor 郭俊芳张梦瑶张寒
Owner WUHAN INSTITUTE OF TECHNOLOGY
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