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Novel nano-composite, preparation method thereof and application of novel nano-composite in sewage detection

A nanocomposite, a new type of technology, applied in chemical instruments and methods, measuring devices, fluorescence/phosphorescence, etc., can solve the problems of detection sensitivity and accuracy limitations

Pending Publication Date: 2020-08-11
CHONGQING VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Titration and electrochemical analysis methods are commonly used in the current methods for detecting phosphate. Although these methods can achieve effective phosphate detection, there are still certain limitations in the detection sensitivity and accuracy in complex systems.

Method used

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  • Novel nano-composite, preparation method thereof and application of novel nano-composite in sewage detection
  • Novel nano-composite, preparation method thereof and application of novel nano-composite in sewage detection
  • Novel nano-composite, preparation method thereof and application of novel nano-composite in sewage detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 The preparation of the carbon quantum that emits yellow fluorescence

[0029] Mix the amino acid, methylumbelliferone and water evenly under stirring. Among them, the amino acid is D-arginine (Arg), and the methylumbelliferone is 4-methylumbelliferone (4-MU). The feeding molar ratio of the two is 1:1, and the total substance amount is 0.5 mmol. Then add 10mL of water, mix uniformly in the hydrothermal reaction kettle, and react at 180°C for 12h under hydrothermal conditions, wherein D-arginine forms carbon quantum dots (CDs) under hydrothermal conditions, and further reacts with 4-MU Luminescent nanoparticles (denoted as CDs-4-MU) were formed. After the reaction, the obtained product was first centrifuged (10000rpm, 5min), then the supernatant was taken into a dialysis bag (MWCO=200Da), dialyzed for 2h, and finally freeze-dried to obtain luminescent nanoparticles, named CDs-4-MU . Then CDs-4-MU was formulated into a solution with a concentration of 0.05...

Embodiment 2

[0030] Embodiment 2 The preparation of the carbon quantum that emits yellow fluorescence

[0031] Mix the amino acid, methylumbelliferone and water evenly under stirring. Among them, the amino acid is D-tryptophan, and the methylumbelliferone is 3,4-dimethylumbelliferone. The feeding molar ratio of the two is 1:1, and the total substance amount is 0.5 mmol. Then add 10mL of water, mix evenly in the hydrothermal reaction kettle, and react at 180°C for 12h under hydrothermal conditions, wherein tryptophan forms carbon quantum dots (CDs) under hydrothermal conditions, and reacts with 3,4-dimethyl Umbelliferone further forms luminescent nanoparticles. After the reaction, the obtained product was first centrifuged (10000rpm, 5min), then the supernatant was placed in a dialysis bag (MWCO=200Da), dialyzed for 2h, and finally freeze-dried to obtain luminescent nanoparticles, and then the nanoparticles were prepared into a concentration For a solution of 0.05mg / mL, take 0.25mL of a ...

Embodiment 3

[0032] Example 3 TEM Characterization of Nanoparticles Emitting Blue Fluorescence

[0033] The luminescent nanoparticle CDs-4-MU synthesized in Example 1 was freeze-dried and dispersed into water (nanoparticle concentration: 0.5 mg / mL), ultrasonicated for 30 min, and then a drop was dropped onto the copper grid with a dropper, and the copper grid was After drying, observe the morphology of the carbon quantum dots under a transmission electron microscope. figure 1 It is the transmission electron microscope figure of the synthesized luminescent nanoparticle CDs-4-MU in embodiment 1, by figure 1 It can be seen that the synthesized luminescent nanoparticles present a uniform shuttle-shaped structure, which proves that the luminescent nanoparticles have been successfully synthesized.

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Abstract

The invention discloses a preparation method of a novel nano-composite. The preparation method comprises the following steps: 1) adding amino acid and methylumbelliferone into water according to a feeding molar ratio of 1: 1, and carrying out uniform mixing; 2) carrying out hydrothermal reaction in a hydrothermal reaction kettle at the reaction temperature of 100-240 DEG C for 5-20 hours; (3) after the reaction is finished, centrifuging the obtained product, taking a supernatant for dialyzing and carrying out drying to obtain nanoparticles emitting blue fluorescence; 4) preparing the nanoparticles obtained in the step 3) into a solution; and 5) mixing the solution obtained in the step 4) with a metal ion solution in a Tris-HCl buffer solution system to form the nano-composite. The preparednovel nano-composite containing the metal ions can be used for detecting the content of phosphate radicals in sewage.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and relates to a novel nanocomposite, its preparation method and its application in sewage detection. Background technique [0002] Phosphorus in water mainly comes from the weathering of phosphorus-containing ore, industrial wastewater, domestic sewage and agricultural drainage. Fertilizers, pesticides, food processing, fermentation, detergent, smelting, electroplating and other industries discharge a large amount of phosphorus-containing wastewater; phosphorus-containing detergents and human metabolites that have been used in large quantities enter rivers through urban drainage systems; Part of it is directly absorbed and utilized by crops, and the rest is absorbed and retained by the soil, or enters the water body through soil erosion and ground runoff. The excrement of livestock and poultry raised in rural areas contains a lot of phosphorus, and will also be washed into the w...

Claims

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Application Information

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IPC IPC(8): G01N21/64C09K11/65C09K11/06
CPCG01N21/6428G01N21/643C09K11/06C09K11/65G01N2021/6432C09K2211/1088
Inventor 朱韵张东岳
Owner CHONGQING VOCATIONAL INST OF ENG
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