Preparation method for coating metal nanoparticles on surface of nano-titania

A technology of metal nanoparticles and nano-titanium dioxide, which is applied in the field of preparation of loaded metal nanoparticles, can solve problems such as poor surface dispersion of titanium dioxide, loaded metal nanoparticles, and large particle size of metal particles, achieving strong repeatability, stable performance, low cost effect

Inactive Publication Date: 2015-03-11
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are reports in the literature that metal nanoparticles such as silver, platinum, and zinc are loaded on anatase titanium dioxide nanoparticles, the preparation conditions are relatively harsh, the steps are cumbersome, and the particle size of the metal particles is large and uneven. The dispersion is also poor
[0006] At present, there is no related report that a variety of metal nanoparticles can be uniformly loaded on the surface of nano-titanium dioxide by one-step hydrothermal method, and there is no related report about loading metal nanoparticles on the surface of brookite titanium dioxide.

Method used

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  • Preparation method for coating metal nanoparticles on surface of nano-titania
  • Preparation method for coating metal nanoparticles on surface of nano-titania

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 0.222g of copper nitrate hexahydrate, 3.124g of sodium nitrate and 0.1 milliliter of methanol were successively added to 65 milliliters of ammonia water with a mass fraction of 10%, stirring and dissolving completely; 8 milliliters of isopropyl titanate was directly added to the above-mentioned ammonia solution, and The isopropyl titanate is rapidly hydrolyzed while stirring vigorously to make it evenly mixed. Then the suspension was put into a Teflon-lined stainless steel autoclave and reacted at 443K for 72 hours. After the reaction, the precipitated product was washed with deionized water, and then vacuum-dried at 333K for 12 hours to obtain brookite-type titanium dioxide nanoparticles supported by copper nanoparticles.

[0027] The prepared brookite-type titanium dioxide nano-rods are in the shape of a bunch of aggregated bouquets, the diameter of a single nano-rod is 40-50 nanometers, and the length is between 1000-2500 nanometers. The size of copper nanoparticles...

Embodiment 2

[0029] Add 0.218g nickel nitrate hexahydrate and 0.15 milliliters of ethanol to 50 milliliters of ammonia water with a mass fraction of 6% successively, stir and dissolve completely; directly add 6 milliliters of n-butyl titanate to the above-mentioned ammonia solution, Stir vigorously while rapidly hydrolyzing to make it evenly mixed. Then the suspension was put into a Teflon-lined stainless steel autoclave and reacted at 473 K for 12 h. After the reaction, the precipitated product was washed with deionized water, and then vacuum-dried at 333K for 6 hours to obtain anatase titanium dioxide nanoparticles supported by nickel nanoparticles.

[0030] The size of the prepared anatase titanium dioxide nanoparticles is about 30 nanometers. The size of nickel nanoparticles is about 2-4 nanometers, and they are evenly loaded on the surface of anatase titanium dioxide nanoparticles. The product purity is above 99%.

Embodiment 3

[0032] Add 0.465g of zinc nitrate hexahydrate and 0.3 ml of methanol to 62 ml of ammonia water with a mass fraction of 15% in turn, stir and dissolve completely; directly add 10 ml of isopropyl titanate to the above ammonia solution, Stir vigorously while rapidly hydrolyzing to make it evenly mixed. Then the suspension was put into a Teflon-lined stainless steel autoclave and reacted at 433K for 48 hours. After the reaction, the precipitated product was washed with deionized water, and then dried under normal pressure at 343K for 24 hours to obtain anatase titanium dioxide nanoparticles loaded with zinc nanoparticles.

[0033] The size of the prepared anatase titanium dioxide nanoparticles is about 20 nanometers. The size of zinc nanoparticles is about 1-2 nanometers, and they are evenly loaded on the surface of anatase titanium dioxide nanoparticles. The product purity is above 99%.

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Abstract

The invention provides a preparation method for coating metal nanoparticles on the surface of nano-titania. The preparation method comprises the following steps of 1, dissolving a nitrate of a transition metal in ammonia water to obtain a metal-ammonia complex ion-containing solution, 2, adding a titanate into the metal-ammonia complex ion-containing solution obtained by the step 1, and vigorously stirring during titanate fast-hydrolysis so that the mixture is mixed uniformly, 3, putting the suspension mixed uniformly by the step 2 into a stainless steel high-pressure kettle with a Teflon lining, and carrying out a hydrothermal reaction process at a temperature of 433 to 473K for 12 to 72 hours, and 4, washing precipitates by deionized water after the hydrothermal reaction, and drying at a temperature of 333 to 373K for 6 to 24 hours to obtain a nano-titania product of which surface is uniformly coated with metal nanoparticles. The preparation method has the advantages of simple process flow, wide parameter adjustment range, low cost, strong repeatability and large synthesis amount.

Description

technical field [0001] The invention relates to a preparation method for loading metal nanoparticles, in particular to a preparation method for loading metal nanoparticles on the surface of nano titanium dioxide. Background technique [0002] In the field of nanomaterials research, the advent of nanoscale titanium dioxide materials is undoubtedly a milestone. Titanium dioxide nanomaterials have the advantages of strong photocatalytic ability, good chemical stability, light corrosion resistance, safety and non-toxicity, no secondary pollution, low cost, and easy availability of raw materials. They are used in air purification, sewage treatment, photolysis of water to produce hydrogen, Many fields such as antibacterial, anti-fog self-cleaning and solar cells have attracted the attention of researchers, and a lot of research has been carried out in many basic and application aspects. [0003] However, titanium dioxide has a wide band gap and low solar light utilization efficie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/10B01J23/72B01J23/755B01J23/75B01J23/50B01J23/44B01J23/42B82Y40/00
Inventor 赵斌焦艳超杨红云张鹏金彩虹何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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