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Preparation method and application of carbon dot modified silicon dioxide nanoparticle-based hydrogel composite material

A technology of silica and nanoparticles, applied in the direction of gel preparation, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of urgent development and other applications, and achieve rapid adsorption and detection, good fluorescence performance, and good fluorescence stability and environmental effects

Pending Publication Date: 2021-10-19
武汉软件工程职业学院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, fluorescent nanoparticles can realize the detection of metal ions in water well. However, the preparation of fluorescent hydrogel composites, especially fluorescent hydrogel composites with high strength and good fluorescence stability, has not been realized. Based on this The application of this kind of hydrogel metal ion sensor needs to be developed urgently

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  • Preparation method and application of carbon dot modified silicon dioxide nanoparticle-based hydrogel composite material
  • Preparation method and application of carbon dot modified silicon dioxide nanoparticle-based hydrogel composite material
  • Preparation method and application of carbon dot modified silicon dioxide nanoparticle-based hydrogel composite material

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Effect test

Embodiment 1

[0029] The preparation of cross-linkable carbon dot modified silica nanoparticles comprises the following steps:

[0030] (1) Preparation of monodisperse silica nanoparticles: first mix 1-5mL tetraethyl orthosilicate and 50mL absolute ethanol evenly, then mix 1-5mL deionized water, 1-5mL ammonia water, 40mL absolute ethanol After mixing evenly, the above two solutions were mixed under room temperature and magnetic stirring, and the reaction was continuously stirred for 20 hours. After the reaction, it was washed three times by ethanol centrifugation. figure 1 shown.

[0031] (2) Preparation of carbon dot-modified silica nanoparticles: mix the silica nanoparticles obtained in (1) with 1 wt% sodium alginate and 1 wt% ethylenediamine, and place them in a high-pressure hydrothermal reactor ( The pressure is 1-5MPa) and reacted in an oven at 180° C. for 5 hours, and the solvent is deionized water. After the reaction was completed, it was cooled to room temperature, washed with e...

Embodiment 2

[0034] The preparation method of the carbon dot modified silicon dioxide nanoparticle-based hydrogel composite film comprises the following steps:

[0035] (1) Blend 1wt% cross-linkable carbon dot modified silica nanoparticles with 0.3mL acrylic acid and 4mL hydroxyethyl methacrylate monomer, after mixing evenly, add 1wt% 1173 initiator, A homogeneous suspension was obtained.

[0036] (2) The suspension prepared above is poured into a mold, and then placed under 365nm UV light irradiation for 5-15 minutes to polymerize. After complete polymerization, the obtained carbon dot modified silica nanoparticle-based hydrogel The composite film and the mold are put into water together. After the swelling balance is reached, the hydrogel composite film is automatically peeled off from the mold, so that a carbon dot modified silica nanoparticle-based hydrogel composite film consistent with the shape of the mold is obtained, as shown in Figure 5 , 6 shown. The obtained hydrogel compos...

Embodiment 3

[0039] Adsorption and Detection of Copper Ions in Silica Nanoparticle-Based Hydrogel Composite Films Modified by Carbon Dots

[0040] (1) Prepare 10mM aqueous solutions of different metal ions, including Na + , K + , Zn 2+ , Cu 2+ ,Pb 2+ , Hg 2+ , Ni 2+ , Ca 2+ , Mg 2+ , Cr 3+ , Fe 3+ and other eleven metal ion aqueous solutions.

[0041] (2) Soak the prepared hydrogel composite film into the above-mentioned eleven kinds of metal ion aqueous solution, take it out after soaking for 1 hour, dry the water on the surface of the hydrogel film with filter paper, and then use the fluorescence spectrometer Measure the fluorescence intensity of the hydrogel composite film.

[0042] (3) Through comparative analysis, among the above ten metal ions, the hydrogel composite film only has a strong extinction phenomenon for copper ions, such as Figure 8 It is shown that the hydrogel composite film has a good ability to detect copper ions. In addition, before and after the adsorp...

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Abstract

The invention discloses a preparation method and application of a carbon dot modified silicon dioxide nanoparticle-based hydrogel composite material. The preparation method comprises the following steps: 1) performing a one-step hydrothermal method on sodium alginate, ethylenediamine and silicon dioxide nanoparticles to obtain carbon dot modified silicon dioxide nanoparticles, and performing a dehydration reaction on the nanoparticles and hydroxyethyl methylacrylate to obtain cross-linkable carbon dot modified silicon dioxide nanoparticles, wherein the particle size of the silicon dioxide nanoparticles is 50-200 nm, and the water suspension of the silicon dioxide nanoparticles can emit blue fluorescence under the irradiation of ultraviolet light; and 2) taking the carbon dot modified silicon dioxide particles as a cross-linking agent, blending the carbon dot modified silicon dioxide particles with acrylic acid and hydroxyethyl methylacrylate monomers, and obtaining a hydrogel composite material through a one-step photopolymerization method. According to the invention, the prepared hydrogel composite material can be applied to adsorption and detection of copper ions (Cu<2+>) in water, and is simple to prepare, good in mechanical stability, high in ion selectivity, non-toxic and environment-friendly.

Description

technical field [0001] The invention relates to the field of synthesis of a hydrogel composite material, in particular to a preparation method and application of a carbon point-modified silica nanoparticle-based hydrogel composite material. Background technique [0002] Due to the advantages of hydrogels, such as high water content, biocompatibility, multiple stimuli responsiveness and fluorescent properties, fluorescent hydrogel composites are widely used in biomedicine, tissue engineering, drug carriers, sensors, actuators and other fields. At present, the preparation method of fluorescent hydrogel composite materials is mainly obtained by embedding fluorescent nanomaterials inside the hydrogel matrix through chemical or physical cross-linking methods. So far, a variety of fluorescent nanoparticles, such as semiconductor quantum dots, perovskite quantum dots, nanocrystalline metal particles, carbon dots, and upconverting nanoparticles, etc., have been used in the preparat...

Claims

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Application Information

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IPC IPC(8): B01J13/00B01J20/28B01J20/30B01J20/26C02F1/28C02F101/20
CPCB01J13/0065B01J13/0056B01J20/28047B01J20/267C02F1/285C02F1/281C02F2101/20
Inventor 魏来徐宗涂小进戴思芮
Owner 武汉软件工程职业学院
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