Preparation method of magnetic imprinting composite photocatalyst with good light transmission

A light-transmitting, photocatalyst technology, applied in the direction of organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the drug resistance and side effects of pathogenic bacteria Harmful to human health, drug-resistant ecological environment and human health hazards, etc., achieve the effect of convenient separation and recovery, and improve photocatalytic activity

Inactive Publication Date: 2013-07-31
JIANGSU UNIV
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  • Abstract
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Problems solved by technology

However, its drug resistance and its side effects have also caused great harm to the ecological environment and human health. Studies have shown that a part of enrofloxacin hydrochloride will enter the soil environment along with the excrement, causing the increase of microbial drug resistance and affecting the soil. The material conversion activity of microorganisms such as respiration and various enzyme activities in the soil have an impact; in addition, some enrofloxacin hydrochloride accumulates in the tissues, organs and products of animals in the form of prototypes and metabolites, resulting in contamination in animal foods. Drug residues accumulate, and their toxic and side effects will directly endanger human health. What is more serious is that the residual low concentration of drugs can easily induce drug resistance in human pathogenic bacteria, which is not conducive to the treatment of human diseases by such drugs

Method used

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  • Preparation method of magnetic imprinting composite photocatalyst with good light transmission
  • Preparation method of magnetic imprinting composite photocatalyst with good light transmission
  • Preparation method of magnetic imprinting composite photocatalyst with good light transmission

Examples

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Embodiment 1

[0045] Example 1: (1) Magnetic Fe 3 o 4 Preparation of nanospheres: Add 1.35g of ferric chloride hexahydrate and 3.6g of sodium acetate into a beaker containing 50mL of ethylene glycol, stir magnetically until the mixture is evenly dispersed, then transfer the yellow solution to an autoclave, React at 200°C for 8 hours, then remove the autoclave, cool to room temperature, rinse the obtained black magnetic particles with absolute ethanol for 5 times, recover the black magnetic particles with a magnet, and dry them in vacuum at 30°C to obtain magnetic Fe 3 o 4 nanospheres.

[0046] (2) SiO 2 Fe 3 o 4 Preparation: Add 5mL of tetraethyl orthosilicate and 35mL of absolute ethanol into a three-neck flask, seal and stir for 15 minutes, then add dropwise a mixture containing 3mL of distilled water, 9mL of concentrated ammonia water and 36mL of absolute ethanol , stirred rapidly for 30 minutes after the dropwise addition was completed, and nitrogen gas was passed, and then 2g of ...

Embodiment 2

[0053] Example 2: Carry out the same steps as the preparation process of Example 1, except that five groups (0.01mL, 0.02mL, 0.04mL, 0.06mL, 0.08mL) of different concentrations of methyl methacrylate ( MMA) to prepare different magnetic surface imprinted composite photocatalysts, investigate the effect of different concentrations of methyl methacrylate (MMA) on the photocatalytic activity of magnetic surface imprinted composite photocatalysts, and investigate the photodegradation according to the step (7) in Example 1 Activity of enrofloxacin hydrochloride in antibiotic wastewater. The photocatalytic effect is as figure 2 As shown, it can be seen that the magnetic surface imprinted composite photocatalyst prepared with a concentration of 0.04mL methyl methacrylate (MMA) has the best photodegradation effect on enrofloxacin hydrochloride antibiotic wastewater.

Embodiment 3

[0054] Example 3: TiO 2 SiO 2 Fe 3 o 4 The FTIR spectra of the photocatalyst and the magnetic surface imprinted composite photocatalyst are shown in image 3 As shown, it can be seen from the figure that 3442cm -1 Office and 2924cm -1 The characteristic absorption peaks of hydroxyl and water are at 1106cm -1 The characteristic absorption peak of Si-O-Si is at 600cm -1 to 400cm -1 Between them are the absorption peaks of inorganic substances Ti-O and Fe-O. In addition, with image 3 a compared to image 3 The extra absorption peaks in b are: 1600cm -1 to 1450cm -1 The absorption peak between is due to the benzene ring in styrene, 1718cm -1 , 1443cm -1 and 1298cm -1 The absorption peaks at are respectively composed of -C=O, O-CH 3 and C-O, the above results indicate that the surface imprinted polymer has been successfully coated on TiO 2 SiO 2 Fe 3 o 4 , and polymethyl methacrylate (PMMA) was also formed in the surface imprinted layer.

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Abstract

The invention provides a preparation method of a magnetic imprinting composite photocatalyst with good light transmission, belonging to the technical field of preparation of environmental materials. The method comprises using magnetic Fe3O4 nanoparticles as carriers, coating SiO2 insulating layers on surfaces of the nanoparticles, using a sol-gel technology to prepare a TiO2@SiO2@Fe3O4 photocatalyst, using polyethylene glycol to treat surface of the photocatalyst, and using modified TiO2@SiO2@Fe3O4 as a base material, enrofloxacin hydrochloride as a template molecule, methyl methacrylate as an imprinting functional monomer, styrene as a polymerization monomer, trimethylol propane trimethacrylate as a cross-linking agent, azodiisobutyronitrile as an initiator and a mixed solution of dimethyl sulphoxide and water as solvents to prepare the magnetic imprinting composite photocatalyst with the good light transmission. The invention is advantageous in that a magnetic separation characteristic of the photocatalyst enables separation and recovery of samples to be relatively convenient and high-efficiency.

Description

technical field [0001] The invention combines methods such as sol-gel method, surface molecular imprinting technology and microwave heating polymerization to prepare a magnetic surface imprinted composite photocatalyst with good light permeability and high selectivity, belonging to the technical field of environmental material preparation. [0002] Background technique [0003] Enrofloxacin hydrochloride (ENRH) is the first animal-specific fluoroquinolone antibiotic drug on the market. It has strong bactericidal ability and broad-spectrum antibacterial properties. However, its drug resistance and its side effects have also caused great harm to the ecological environment and human health. Studies have shown that a part of enrofloxacin hydrochloride will enter the soil environment along with the excrement, causing the increase of microbial drug resistance and affecting the soil. The material conversion activity of microorganisms such as respiration and various enzyme activiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C02F1/30C02F1/58
Inventor 逯子扬闫永胜霍鹏伟潘建明罗莹莹李继琴马中飞
Owner JIANGSU UNIV
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