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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At present, fluorescent nanoparticles can realize the detection of metal ions in water well. However, the preparation of fluorescent hydrogel composites, especially fluorescent hydrogel c...

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.

Application Domain

Other chemical processesWater contaminants +4

Technology Topic

Silica nanoparticlesSilicon dioxide nanoparticles +18

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Experimental program(3)

Example Embodiment

[0028] Example 1

[0029] The preparation of the crosslinkable carbon dot modified silica nanoparticles, including the following steps:

[0030] (1) Preparation of single-dispersed silica nanoparticles: 1-5 ml of tetraeth ester with 50 ml of orthosilic acid is mixed uniform, and then 1-5 ml of deionized water, 1-5 mL ammonia water, 40 ml absolute ethanol The above two solutions were mixed under mixing, and the above two solutions were mixed at room temperature and magnetic stirring, and the reaction was continuously stirred for 20 hours. After the reaction, the use of ethanol is cleaned three times, such as figure 1 Indicated.

[0031] (2) Preparation of carbon dot modified silica nanoparticles: The silica nanoparticles obtained in (1) were mixed with 1 wt% alginate, 1 wt% ethylenediamine, and placed in a high pressure hydrothermal reaction kettle ( The pressure was 1-5 MPa in an oven at 180 ° C for 5 hours, and the solvent was deionized water. After cooling, cooled to room temperature, centrifuged with ethanol and washed three times. figure 2 Indicated.

[0032] (3) Preparation of the crosslinked carbon dot modified silica nanoparticles: The above-mentioned carbon dot modified silica nanoparticles and 10 ml of hydroxyethyl methacrylate are mixed uniform and catalyzed at 1 mL of EDC. o C is stirred for 3 h for dehydration reaction, and the reaction is cleaned three times with deionized water centrifugation. image 3 Indicated. Infrared spectrum data ( Figure 4 It is confirmed that the crosslinkable carbon dot modified silica nanoparticles contain features of inorganic silica nanoparticles and organic carbon dots.

Example Embodiment

[0033] Example 2

[0034] Method for preparing the carbon dot modified silica nanoparticle base hydrogel composite film, including the following steps:

[0035] (1) 1 wt% crosslinkable carbon dot modified silica nanoparticles and 0.3 ml of acrylic acid and 4 mL of methyl methacrylate monomer, mix well, add 1% by weight of 1173 initiator, Get a homogenous suspension.

[0036] (2) Pour the above-mentioned suspension in the mold, then placed in 365 nm UV light irradiation, polymerization for 5-15 minutes, after the polymerization is complete, the obtained carbon dot is modified from the silica nanoparticle base water gel. After the composite film and the mold are placed in water, after the swelling balance is reached, the hydrogel composite film is automatically peeled off from the mold, thereby obtaining a carbon dot modified silica nanoparticle-based hydrogel composite film consistent with the mold shape. Figure 5 , 6 Indicated. The resulting hydrogel composite film is a transparent hydrogel film under visible light, and a strong blue fluorescence can be emitted under ultraviolet light, such as Figure 5. Excited in different excitation wavelengths such as from 340 nm to 440 nm, the emission color of the resulting hydrogel composite film is basically stable in the blue range, such as Image 6 Indicated.

[0037] (3) The prepared carbon dot modified silica nanoparticle base hydrogel composite film has good mechanical stability, its tensile strength, such asFigure 7 As shown, the tensile strength can reach 13.2 MPa under conditions having a water content of 10 wt%.

Example Embodiment

[0038] Example 3

[0039] Copper ion adsorption and detection of carbon dot modified silica nanoparticle base hydrogel composite film

[0040] (1) Formulated 10 mM different metal ionic solution, including NA + K + , Zn 2+ Cu 2+ , PB 2+ Hg 2+ Ni 2+ CA 2+ Mg 2+ , Cr 3+ , Fe 3+ Wait for 11 metal ionic solutions.

[0041] (2) The prepared hydrogel composite film is soaked into the above-mentioned eleven metal ionic aqueous solution, soaked in 1 hour, remove the water surface of the water gel film, and then fluorescence spectrometer Measuring the fluorescence intensity of the hydrogel composite film.

[0042] (3) By comparative analysis, in the above ten metal ions, the hydrogel composite film is only strong to the copper ions, such as Figure 8 As shown, it shows that this hydrogel composite film has good copper ion detection capabilities. Further, before and after the adsorption of copper ions, the color of the hydrogel composite film became a green, such as Figure 5 with 9 As shown, it shows that this hydrogel composite film has good copper ion adsorption properties.

PUM

Property	Measurement	Unit
Tensile strength	13.2	mPa

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Classification and recommendation of technical efficacy words

High mechanical strength

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

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