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Titanium dioxide/thermo-sensitive polymer hybrid material as well as preparation method and application thereof

A temperature-sensitive polymer and titanium dioxide technology, applied in chemical instruments and methods, water pollutants, light water/sewage treatment, etc., can solve problems such as difficult recycling, water system pollution, etc., achieve high synthesis rate, stable structure, Realize the effect of photocatalytic degradation and recycling

Inactive Publication Date: 2019-02-05
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when applied to the field of photocatalytic water treatment, ordinary nano-TiO 2 Due to its own size effect in the water system, it is difficult to settle in the water system, it is difficult to recycle in the water system, and it is easy to cause secondary pollution to the water system

Method used

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  • Titanium dioxide/thermo-sensitive polymer hybrid material as well as preparation method and application thereof
  • Titanium dioxide/thermo-sensitive polymer hybrid material as well as preparation method and application thereof
  • Titanium dioxide/thermo-sensitive polymer hybrid material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] TiO 2 / poly(DEGEEA)-r-(PEGA 480 ) preparation method of hybrid material, concrete steps are as follows:

[0051] Step 1, the Me 6 Add TREN to water, blow nitrogen to remove oxygen, add an equimolar amount of CuBr, continue to flow nitrogen, and stir in an ice-water bath until Cu + Disproportionation to Cu 2+ and Cu, the blue solution becomes purple, and the catalyst solution is obtained;

[0052] Step 2, i-PrOH, DOPA-Br, DEGEEA and PEGA 480 Add it into water, pass through nitrogen to remove oxygen, and obtain a monomer mixed solution;

[0053] Step 3, adding the monomer mixed solution into the catalyst solution, stirring and reacting under the protection of nitrogen, dialyzing to remove unreacted monomer and small molecular impurities after the reaction, and freeze-drying to obtain the temperature-sensitive polymer poly(ethylene glycol) Ester ethyl ether-random-(ethylene glycol) methyl ether acrylate poly(DEGEEA)-r-(PEGA 480 );

[0054] Step 4, the nano-TiO 2 a...

Embodiment 2

[0057] TiO 2 / poly(DEGEEA)-r-(PEGA 480 ) The preparation of the hybrid material is prepared by a one-pot method, and the specific steps are as follows:

[0058] Step 1, the Me 6 Add TREN to water, blow nitrogen to remove oxygen, add an equimolar amount of CuBr, continue to flow nitrogen, and stir in an ice-water bath until Cu + Disproportionation to Cu 2+ and Cu, the blue solution becomes purple, and the catalyst solution is obtained;

[0059] Step 2, isopropanol (i-PrOH), dopamine initiator (DOPA-Br), DEGEEA and PEGA 480 Add it into water, pass through nitrogen to remove oxygen, and obtain a monomer mixed solution;

[0060] Step 3, the nano-TiO 2 Dispersed in water, nitrogen was passed through to remove oxygen, and the degassed TiO 2 Add the aqueous solution and the monomer mixed solution to the catalyst solution, stir at 0°C to 5°C under nitrogen protection for more than 2 days, add water to dilute, ultrasonically disperse to form a uniform suspension, centrifuge, rep...

Embodiment 3

[0062] TiO 2 / poly(DEGEEA)-b-(PEGA 480 ) preparation method of hybrid material, concrete steps are as follows:

[0063] Step 1, the Me 6 Add TREN to water, blow nitrogen to remove oxygen, add an equimolar amount of CuBr, continue to flow nitrogen, and stir in an ice-water bath until Cu + Disproportionation to Cu 2+ and Cu, the blue solution becomes purple, and the catalyst solution is obtained;

[0064] Step 2, adding i-PrOH, DOPA-Br and DEGEEA into water, passing nitrogen to remove oxygen, and obtaining a monomer mixed solution;

[0065] Step 3, add the monomer mixed solution to the catalyst solution, stir and react under nitrogen protection, after reacting for 2 hours, add PEGA 480 , DOPA-Br, DEGEEA and PEGA 480 The molar ratio is 1:40:4.8. After continuing to react for 1 hour, unreacted monomers and small molecular impurities are removed by dialysis, and freeze-dried to obtain the temperature-sensitive polymer poly(DEGEEA)-b-(PEGA 480 );

[0066] Step 4, the nano-Ti...

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Abstract

The invention discloses a titanium dioxide / thermo-sensitive polymer hybrid material as well as a preparation method and application thereof. The hybrid material is characterized in that nano-TiO2 is taken as a core, and a thermo-sensitive polymer, namely, poly-(glycol)ester ethylether-random-(glycol)methyl ether acrylic ester or poly-(glycol)ester ethylether-segmented-(glycol)methyl ether acrylicester is grafted onto the surface. Based on an SET-LRP (Single Electron Transfer-Living Radical Polymerization) method, a nitrogen-containing ligand which has high catalytic activity and tends to cause the disproportionation of copper is selected in the presence of a catechol initiator, so that strong complexing of a copper halide is realized, and the interference with a metal catalyst caused by acatechol group is realized in order to prepare a series of water-soluble polymers. The hybrid material is stable in structure, the low critical dissolving temperature of the water-soluble polymer isregulated and controlled by controlling the molecular weight of the polymer, uniform dispersion as well as self-fluctuation and recovery of TiO2 nanoparticles in water can be realized through a temperature switch, and sunlight photocatalytic degradation of target pollutants is realized. The hybrid material is suitable for sewage of different temperatures.

Description

technical field [0001] The invention belongs to the field of polymer materials and relates to a TiO 2 / temperature-sensitive polymer hybrid material and its preparation method and application, specifically relate to a kind of water system under SET-LRP method to prepare temperature-sensitive polymer poly(DEGEEA)-r-(PEGA 480 ) and poly(DEGEEA)-b-(PEGA 480 ) grafted onto TiO 2 Surface-formed TiO2 / thermo-sensitive polymer hybrid materials and their application in photocatalytic degradation of pollutants. Background technique [0002] Organic-inorganic hybrid composite materials not only have the characteristics of high structural strength and excellent heat resistance of inorganic materials, but also have the advantages of good flexibility and reasonable price of organic materials, and have attracted widespread attention. Hybrid nanoparticles usually consist of two parts: the inner nanoparticle and the outer polymer layer. The structure of the polymer layer in the outer la...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08F293/00C08K3/22C02F1/30C02F101/30
CPCC02F1/30C02F2101/308C08F293/005C08G83/001C08K3/22C08K2003/2241C08K2201/011
Inventor 张强王东浩
Owner NANJING UNIV OF SCI & TECH
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