Carbon nitride hydrogel and preparation method thereof

A technology of carbon hydrogel and carbon nitride, applied in gel preparation, chemical instruments and methods, water treatment of special compounds, etc., can solve the problems of unfavorable hydrogel uniform growth, difficult to degrade basic dyes, etc., and achieve outstanding adsorption and degradation, simple and easy to operate, highlighting the effect of fluorescence effect

Inactive Publication Date: 2017-04-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon nitride raw materials used in this process are all from the hard-to-disperse massive traditional carbon nitride (made by direct calcination of melamine), which is not conducive to the uniform growth of hydrogel [Zhang Y, Zhou Z, Shen Y, Zhou Q, Wang J, Liu A, Liu S, Zhang Y. Reversible assembly of graphitic carbon nitride 3D network for highly selective dyes absorption and regeneration. ACS Nano, 2016, 10, 9036-9043]
In order to solve the above problems, the research group used sodium hydroxide to modify its surface to improve solubility, but it is difficult to degrade basic dyes (such as methylene blue, etc.) due to the introduction of strong alkali.
Therefore, carbon nitride hydrogels with outstanding adsorption and degradation effects on basic dyes have not been reported yet.

Method used

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  • Carbon nitride hydrogel and preparation method thereof
  • Carbon nitride hydrogel and preparation method thereof
  • Carbon nitride hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: ultrasonically disperse 1 mg of carbon nitride in 100 mL of deionized water for 24 h to obtain a carbon nitride aqueous solution;

[0029] In the second step, 400 mg of N,N-dimethylacrylamide and 4 mg of N,N'-methylenebisacrylamide were dissolved in 4.6 g of carbon nitride aqueous solution, and ultrasonicated for 5-10 minutes;

[0030] In the third step, nitrogen gas is passed into the above-mentioned mixed solution to replace the dissolved oxygen, and then a certain amount of mixed solution is drawn with a 5 ml cylindrical syringe;

[0031] The fourth step is to place the syringe vertically under a white LED lamp (power 50-200W), and keep a certain distance (5-10 cm) from the light source, and irradiate until the solution turns into a gel.

[0032] The preparation process adopted in the present invention is as figure 1 shown.

Embodiment 2

[0034] Step 1: ultrasonically disperse 2 mg of carbon nitride in 100 mL of deionized water for 24 h to obtain a carbon nitride aqueous solution;

[0035] In the second step, 400 mg of N,N-dimethylacrylamide and 4 mg of N,N'-methylenebisacrylamide were dissolved in 4.6g of carbon nitride aqueous solution and ultrasonicated for 5-10 minutes;

[0036] In the third step, nitrogen gas is passed into the above-mentioned mixed solution to replace the dissolved oxygen, and then a certain amount of mixed solution is drawn with a 5 ml cylindrical syringe;

[0037] The fourth step is to place the syringe vertically under a white LED lamp (power 50-200W), and keep a certain distance (5-10 cm) from the light source, and irradiate until the solution turns into a gel.

Embodiment 3

[0039] Step 1: ultrasonically disperse 3 mg of carbon nitride in 100 mL of deionized water for 24 h to obtain a carbon nitride aqueous solution;

[0040] In the second step, 400 mg of N,N-dimethylacrylamide and 4 mg of N,N'-methylenebisacrylamide were dissolved in 4.6g of carbon nitride aqueous solution and ultrasonicated for 5-10 minutes;

[0041] In the third step, nitrogen gas is passed into the above-mentioned mixed solution to replace the dissolved oxygen, and then a certain amount of mixed solution is drawn with a 5 ml cylindrical syringe;

[0042] The fourth step is to place the syringe vertically under a white LED lamp (power 50-200W), and keep a certain distance (5-10 cm) from the light source, and irradiate until the solution turns into a gel.

[0043] The fifth step is to study the photodegradation of the above-mentioned gel with dyes. The specific steps are as follows: cut the prepared hydrogel into a 0.5 mL cylinder, and then add 5 mL of methylene blue (MB) and me...

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Abstract

The invention discloses carbon nitride hydrogel and a preparation method thereof. The hydrogel consists of high-dispersion carbon nitride, N,N-dimethyl acrylamide as a polymer monomer and N,N'-methylene bisacrylamide as a cross-linking agent jointly. The preparation method comprises the following steps: generating photo-induced electrons and cavities by using a semi-conductor carbon nitride material under the condition of photo-initiation; reacting the photo-induced electrons and the cavities with abundant water to generate a large number of hydroxyl radicals; and then carrying out polymerization reaction on monomers for polymerization and the cross-linking agent to form the carbon nitride hydrogel. The carbon nitride hydrogel has good mechanical strength and deformation recovery ability, and has unique hydrophilicity and ultraviolet response. The swelling property of the hydrogel is utilized fully, and after the hydrogel is used for treating water pollution, people can discover that the carbon nitride hydrogel has outstanding adsorption and degradation effects on cationic dyes such as methylene blue (MB).

Description

technical field [0001] The invention relates to the design, preparation and application of a carbon nitride hydrogel material, belonging to the field of nanometer material applications. Background technique [0002] Hydrogels are among the most widely studied soft materials in recent years and are ubiquitous in nature. It is a gel with water as the dispersion medium. A part of hydrophobic groups and hydrophilic residues are introduced into the water-soluble polymer with network crosslinked structure. The hydrophilic residues combine with water molecules to connect water molecules in the network. internally, while the hydrophobic residues swell with water-swelling cross-linked polymers. It is a polymer network system, which is soft in nature, can maintain a certain shape, and can absorb a large amount of water. As a material with high water absorption and high water retention, hydrogel is widely used in various fields, such as drought resistance in arid areas, facial masks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00B01J20/26B01J20/30B01J20/28B01J31/02C02F1/28C02F1/30
CPCB01J13/0065B01J20/0259B01J20/261B01J20/28047B01J31/0237B01J35/004B01J2220/46B01J2220/4806B01J2220/4812C02F1/28C02F1/30C02F2101/308C02F2305/10
Inventor 汪信孙敬文付永胜朱俊武
Owner NANJING UNIV OF SCI & TECH
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