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A heterogeneous photocatalytic resonance fluorescence method for accurate detection of trace uranium in environmental water samples

A resonance fluorescence and detection environment technology, which is applied in measuring devices, fluorescence/phosphorescence, and material analysis through optical means, can solve the problems of high cost of functionalized DNAzyme, low ability to resist matrix interference, and difficulty in popularization and application, and achieve convenience Magnetic separation, good selectivity, and the effect of improving extraction efficiency

Active Publication Date: 2019-08-16
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own advantages, but still need to further improve the detection efficiency, reduce the cost and simplify the tedious process of sample handling
There are also some simple and easy UO 2 2+ Sensing methods are developed to achieve UO 2 2+ On-site rapid detection, but the existing sensing detection methods cannot be directly used for trace UO in actual environmental water samples due to low sensitivity, poor selectivity, or low ability to resist matrix interference 2 2+ detection
Recently, it has been proposed to combine functionalized DNAzyme, nano-gold and horseradish peroxidase to detect uranium by ultraviolet-visible spectroscopy. The cost is high and it needs to be stored at extremely low temperature (-20°C), which is difficult to popularize under harsh conditions

Method used

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  • A heterogeneous photocatalytic resonance fluorescence method for accurate detection of trace uranium in environmental water samples
  • A heterogeneous photocatalytic resonance fluorescence method for accurate detection of trace uranium in environmental water samples
  • A heterogeneous photocatalytic resonance fluorescence method for accurate detection of trace uranium in environmental water samples

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Experimental program
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Effect test

Embodiment 1

[0035] 1. UMIP Preparation

[0036] Take 0.15g [uranyl-Salophen] and 3 ml 3-aminopropyltriethoxysilane and disperse in 50 mL absolute ethanol and stir for 0.5 hours, then add 4 mL tetraethoxysilane, continue stirring for 20 min, add 0.40 g Fe 3 o 4 @SiO 2 and 1 mL of 0.01 mol / L hydrochloric acid, and kept stirring at room temperature for 15 hours. After the reaction was completed, the uranyl-Salophen molecularly imprinted polymer (UMIP) on the surface of the synthesized magnetic core-shell nanoparticles was separated by a magnet, washed with absolute ethanol, and dried in vacuum at 60 °C. At the same time, as a reference, the magnetic non-molecularly imprinted polymer can be synthesized by the same method without adding uranyl.

[0037] 2. Preprocessing of UMIP

[0038] Put the synthesized UMIP product into a small beaker filled with 10 ml 0.5 mol / L HCl, stir and elute for 90 min; extract the synthesized product until the "magnetic Fe 3 o 4 Core-SiO 2 The template mole...

Embodiment 2

[0044] Such as figure 2 It is an experimental device for heterogeneous photocatalytic detection. This experimental device is mainly composed of four parts: photocatalytic reaction system, low heat and strong light source, air-cooled constant temperature system and electromagnetic stirring system.

[0045] The photocatalytic reaction system is composed of 8-10 transparent glass stoppered colorimetric test tubes, which are uniformly inserted into the air-cooled thermostat from above and distributed symmetrically around the light source. The reaction tubes are filled with reaction solution, UMIP for absorbing uranium and small magnetic stirrer ;The light source of low heat and strong light adopts straight energy-saving lamps; the air-cooled constant temperature system consists of two parts: an air-cooled constant temperature box and an air compressor (or vacuum pump). It is made of light wood or plastic plate, and the bottom layer is a thinner stainless steel plate to facilitate...

Embodiment 3

[0047] After centrifuging and filtering the collected pond water and factory sewage of Nanhua University, the water samples were treated with cation exchange resin to separate the ions that may interfere. Take 1ml water samples respectively and operate according to the method of Example 1, and compare the Δ of the standard uranyl concentration obtained in Example 1 F value, for the UO in the water sample 2 2+ Carry out quantitative detection, detection result is as shown in table 1, and the measurement result of ICP-MS is approximately the same, illustrates that the method of the present invention is a kind of can accurately detect UO in water environment. 2 2+ The method is suitable for sample detection in water environment,

[0048] Table 1. UO in pond water and factory sewage water samples of Nanhua University using the established method 2 2+ Ion analysis results and comparison with ICP-MS detection results

[0049] .

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Abstract

The invention relates to a heterogeneous photocatalysis resonance fluorescence method for accurately detecting trace uranium in an environmental water sample. The method mainly comprises the following steps: quantitatively separating the trace uranyl in a complex environmental water sample by using solid phase extraction particles UMIP having a specific recognition and adsorptive action on UO2<2+>, and adsorbing the trace uranyl to the surface of the UMIP to form a uranium-containing molecularly imprinted polymer; then accurately detecting the content of the uranium by the heterogeneous photocatalysis resonance fluorescence method. The method has the characteristics of high sensitivity, high specificity, high matrix interference resistance, simplicity, quickness and low cost. The invention also discloses a heterogeneous photocatalysis kinetic analysis and detection device which comprises a photocatalytic reaction system, a low-heat high light source, an air-cooled constant temperature system and an electromagnetic-stirring system.

Description

technical field [0001] The invention belongs to the technical field of water environment safety detection, and in particular relates to solid-phase extraction and separation of trace uranium in environmental water samples, multiphase photocatalytic resonance fluorescence analysis and detection, and the application of the two in the detection of uranium pollutants in environmental water samples. Background technique [0002] With the rapid development of the nuclear industry, which uses uranium as one of the important raw materials, the pollution of uranium in the living environment has become a research hotspot. Uranium is a heavy metal element with both chemical toxicity and radiotoxicity, which seriously endangers human health and the ecological environment. The chemical genotoxicity of uranium is similar to that of hexavalent chromium, and the radiotoxicity of uranium is closely related to the intensity of radiation received. The radioactive damage of high-dose uranium ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64
CPCG01N21/6428G01N21/6458
Inventor 李贵荣李节康让蔚清杨慧仙徐梦媛
Owner NANHUA UNIV
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