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Preparation method of core-shell type titanium dioxide-coated carboxyl chitosan nanoparticles

A carboxyl chitosan, titanium dioxide technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc. to avoid hydrolysis and agglomeration, improve reaction efficiency and uniformity, and improve biocompatibility

Active Publication Date: 2021-09-28
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-titanium dioxide also has the following problems: due to its high specific surface area and small size, it is very easy to agglomerate; the electrons and holes that play a major role in the photocatalytic process are easy to recombine, which affects the photocatalytic effect; its photocatalytic reaction is spontaneous and non-selective. Yes, while decomposing pollutants, it will also cause severe corrosion of the attached carrier
In addition, for the composite methods of the two, most of the studies are simple direct composites, which cannot completely cover nano-titanium dioxide, resulting in certain photocatalytic damage to the carrier by the composite particles, which in turn affects the service life of the substrate.

Method used

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  • Preparation method of core-shell type titanium dioxide-coated carboxyl chitosan nanoparticles
  • Preparation method of core-shell type titanium dioxide-coated carboxyl chitosan nanoparticles
  • Preparation method of core-shell type titanium dioxide-coated carboxyl chitosan nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In this example, core-shell titanium dioxide@carboxychitosan nanoparticles were prepared according to the following steps:

[0038] (1) Under strong stirring, add 1mL tetrabutyl titanate dropwise to 10mL ionic liquid 1-ethyl-3-methylimidazole acetate within 5min at a constant speed, react at room temperature for 0.5h, and add 2mL dropwise at a constant speed within 5min. Ionized water, reacted at 40°C for 4 hours, added 20mL of absolute ethanol, stirred evenly, centrifuged three times at high speed, discarded the supernatant, sonicated three times with 50% ethanol, filtered, and dried in vacuum at 40°C to obtain anatase nano-titanium dioxide.

[0039] (2) Take 0.025g of titanium dioxide prepared in the above step (1) and disperse it in 50mL of 2% acetic acid (v / v) solution, add 1mmol CTAB, stir vigorously for 30min, put it into a reaction kettle, place it in a microwave reactor, and ℃ for 20 minutes to prepare a cation-modified titanium dioxide dispersion. The power of...

Embodiment 2

[0043] In this example, core-shell titanium dioxide@carboxychitosan nanoparticles were prepared according to the following steps:

[0044] (1) Under strong stirring, add 2.5mL tetrabutyl titanate dropwise to 15mL ionic liquid 1-ethyl-3-methylimidazole acetate within 10min at a constant speed, react at room temperature for 1h, and add 5mL dropwise at a constant speed within 10min to remove Ionized water, reacted at 45°C for 5 hours, added 30mL of absolute ethanol, stirred evenly, centrifuged at high speed for 3 times, discarded the supernatant, ultrasonicated 50% (v / v) ethanol three times, filtered, and dried in vacuum at 40°C to obtain anatase type nano titanium dioxide.

[0045] (2) Take 0.05g of titanium dioxide prepared in the above step (1) and disperse it in 50mL of 2% acetic acid (v / v) solution, add 3mmol CTAB, stir vigorously for 30min, put it into a reaction kettle, place it in a microwave reactor, and ℃ for 30 minutes to prepare a cation-modified titanium dioxide dis...

Embodiment 3

[0049] In this example, core-shell titanium dioxide@carboxychitosan nanoparticles were prepared according to the following steps:

[0050] (1) Under strong stirring, add 5 mL of tetrabutyl titanate to 20 mL of ionic liquid 1-ethyl-3-methylimidazole acetate at a constant speed within 15 minutes, react at room temperature for 1.5 hours, and add 8 mL at a constant speed within 20 minutes to remove Ionized water, reacted at 50°C for 6h, added 40mL of absolute ethanol, stirred evenly, centrifuged at high speed for 3 times, discarded the supernatant, ultrasonicated 50% (v / v) ethanol for three times, filtered, and dried in vacuum at 40°C to obtain anatase Nano titanium dioxide.

[0051] (2) Take 0.10 g of titanium dioxide prepared in the above step (1) and disperse it in 50 mL of 2% acetic acid (v / v) solution, add 6 mmol of CTAB, stir vigorously for 30 min, put it into a reaction kettle, place it in a microwave reactor, and ℃ for 50 minutes to prepare a cation-modified titanium diox...

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Abstract

The invention discloses a preparation method of core-shell type titanium dioxide and carboxyl chitosan nanoparticles. Anatase type nano titanium dioxide prepared by ionic liquid reaction and carboxyl chitosan are used as raw materials, and the core-shell type titanium dioxide-coated carboxyl chitosan nanoparticles are prepared through the ionic gelation effect of CTAB cation modified titanium dioxide and phosphate and the cross-linking assembly of a polymer assistant. The method disclosed by the invention is simple and convenient to operate, green and environment-friendly, the prepared core-shell nanoparticles can effectively avoid photo-corrosion of nano titanium dioxide to a carrier, and as amino and carboxyl of carboxyl chitosan can be respectively combined with photo-induced electrons and holes of nano titanium dioxide, the photocatalytic performance of titanium dioxide is remarkably enhanced, and electrostatic repulsion exists on the surfaces of the core-shell nanoparticles, so that the defect that the nanoparticles are easy to agglomerate is overcome, and the application prospect is wide.

Description

technical field [0001] The invention relates to a method for preparing core-shell titanium dioxide@carboxychitosan nanoparticles, belonging to the technical field of functional nanomaterial preparation. Background technique [0002] Chitosan is the product of deacetylation of chitin, the second largest biomass resource in nature, and the only natural cationic basic aminopolysaccharide in nature. It has wide sources, renewable, low cost, good biocompatibility, degradability, Non-toxic and other advantages. However, it is insoluble in water itself, but soluble in acidic solution, which is highly corrosive and pollutes the environment. Carboxychitosan is the product of chitosan after selective oxidation by an oxidation system. It is characterized in that some of the hydroxyl groups on the C6 position are oxidized to carboxyl groups while the rest of the functional groups remain unchanged, and carboxychitosan has good water solubility and chemical reactivity. The unique advant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J35/02B01J21/06B01J35/00
CPCB01J31/069B01J21/063B01J35/398B01J35/40B01J35/39
Inventor 李日新许云辉丁朝阳张月邓梦晴丁文倩郭仕豪许成刚
Owner ANHUI AGRICULTURAL UNIVERSITY
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