Preparation method of targeted adsorption in-situ regeneration hydrophilic nano molecularly imprinted material
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An in-situ regeneration and nano-molecular technology, applied in chemical instruments and methods, catalyst activation/preparation, water pollutants, etc., can solve problems such as easy collapse, small specific surface area, complex process, etc., to improve removal capacity and dosage The effect of less and simple operation
Active Publication Date: 2020-09-15
MINNAN NORMAL UNIV
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[0004]
2. The preparation process is complicated, and the prepared polymer has few sites and is easy to collapse. Due to the preparation in organic solvent, the hydrophilicity is poor, and the molecular recognition ability in aqueous solution is weak, which limits the application in the fields of food, biology and environment;
[0005]
3. Traditional molecularly imprinted polymers are blocky and need to be further ground and sieved to obtain particles of a certain size. The shape of the particles is irregular, the particles are large, the specific surface area is small, the recognition site is not easy to access, and the template molecules are difficult to elute;
[0007]
5. After the target molecule is adsorbed, it cannot be regenerated or needs to be regenerated with a solvent, and the process is complicated
[0008]
Therefore, traditional molecularly imprinted polymers have low yield and binding capacity
Method used
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Embodiment 1
[0036] see figure 1 and figure 2 , a method for preparing a targeted adsorption in-situ regeneration hydrophilic nano-molecularly imprinted material, comprising the following steps:
[0037] S1, using syrup waste liquid and sodium lauryl sulfate to synthesize syrup nano-carbon spheres through hydrothermal reaction;
[0038] S2. Disperse 100 mg of syrup nanocarbon spheres (DDSC) in 20 mL of absolute ethanol, then add 2 mL of tetrabutyl titanate (TBOT), stir at room temperature for 24 hours, then suction filter, wash, and dry at 80 ° C. Dry under vacuum for more than 12 hours, and finally calcined at 400-600°C for 1-3 hours to obtain HollowC,N-TiO 2 @C microspheres; in the preparation process, in order to prevent HollowC, N-TiO 2 @C microspheres are oxidized, and a protective atmosphere (such as nitrogen) can be added during calcination.
[0039]S3. Add 1-2 parts of formaldehyde aqueous solution, 2-4 parts of resorcinol, and 40-60 parts of ultrapure water into a three-necke...
Embodiment 2
[0045] S1, using syrup waste liquid and sodium lauryl sulfate to synthesize syrup nano-carbon spheres through hydrothermal reaction;
[0046] The preparation process of the syrup nano-carbon spheres in this example is as follows: Weigh 50.00 g of syrup waste liquid and 0.05 g of sodium dodecyl sulfate (SDS) in a beaker, stir for 30 min at a constant temperature of 40 ° C, and then transfer to a 100 mL high-pressure In the reaction kettle, heat at 180°C for 8h. After cooling to room temperature, filter with suction (0.22um water-based filter membrane), wash the product with distilled water and absolute ethanol three times, and vacuum-dry at 80°C for more than 12 hours to obtain syrup nanocarbon spheres.
[0047] S2. Disperse 100 mg of syrup nanocarbon spheres (DDSC) in 20 mL of absolute ethanol, then add 2 mL of tetrabutyl titanate (TBOT), stir at room temperature for 24 hours, and then suction filter (0.22 μm is used in this embodiment) water-based filter membrane), washed, a...
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Abstract
The invention relates to the field of molecularly imprinted materials, and discloses a preparation method of a targeted adsorption in-situ regeneration hydrophilic nano molecularly imprinted material.The preparation method comprises the following steps: preparing multi-group nano carbon spheres from syrup wastewater, synthesizing carbon and nitrogen co-doped nano TiO2 carbon spheres on the surfaces of the nano carbon spheres in situ by adopting a sol-gel method, and calcining to remove cores to form a hollow structure, thereby enhancing the yield and specific surface area of the surface molecularly imprinted polymer, and having multiple binding sites and high mass transfer rate; using sulfanilamide and nitrosamine pollutants as target molecules, using resorcinol and melamine as bifunctional monomers, using a formaldehyde aqueous solution and TiO2 as double cross-linking agents, and using acetonitrile i as a pore-forming agent to form a carbon nanosphere surface molecularly imprinted hollow material so that the specific surface area of the molecularly imprinted material is increased, higher targeted adsorption capacity is achieved, operation is easy, and the use amount of chemicalagents is small; with the use of C, N-TiO2 photocatalytic material in the material, visible light is directly utilized to catalyze and degrade target molecules, and in-situ regeneration and repeated utilization of the molecularly imprinted material are realized.
Description
technical field [0001] The invention relates to the field of molecularly imprinted materials, in particular to a preparation method for targeted adsorption in-situ regeneration hydrophilic nanometer molecularly imprinted materials. Background technique [0002] Traditional molecularly imprinted polymers have several disadvantages: [0003] 1. Reagents used for preparation such as functional monomers (such as methacrylic acid, ethylene glycol dimethacrylate, 5-vinyl-8-hydroxyquinoline or tetraethyl orthosilicate, etc.), crosslinking agents (such as 2,2-Azoisobutyronitrile, Ethylene Glycol Dimethacrylate, 1,4-Diacryloylpiperazine or N,N'-1,4-Phenyldiallylamine, etc.) and porogens (such as Tetrahydrofuran) etc. are all organic reagents; [0004] 2. The preparation process is complicated, and the prepared polymer has few sites and is easy to collapse. Due to the preparation in organic solvent, the hydrophilicity is poor, and the molecular recognition ability in aqueous solutio...
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