Method for preparing TiO2@Au core-shell structure in template method

A technology of core-shell structure and template method, which is applied in the direction of chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of high probability of band gap and electron-hole recombination, and the reaction process cannot be carried out directly. Observation, photocatalytic performance is not greatly improved and other problems, to achieve the effect of uniform size, avoiding gold falling off, and improving stability

Inactive Publication Date: 2018-01-19
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] As a semiconductor material, titanium dioxide has been widely used in the field of photocatalysis. However, due to its wide band gap and high probability of electron-hole recombination, its photocatalytic performance has not been greatly improved.
However, the hydrothermal method has a long reaction period, and the reaction process is carried out in a closed system, so the reaction process cannot be directly observed.

Method used

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  • Method for preparing TiO2@Au core-shell structure in template method
  • Method for preparing TiO2@Au core-shell structure in template method
  • Method for preparing TiO2@Au core-shell structure in template method

Examples

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preparation example Construction

[0028] Preparation of gold sol:

[0029] Take 90ml of ultrapure water, add it into the flask and stir, then add 1ml of 1% HAuCl 4 (chloroauric acid) and let it stir for 1min, add 2ml trisodium citrate solution after 1min, add 1mlNaBH after stirring for 1min 4 and 1ml of trisodium citrate, the wine red solution obtained after stirring for 5min is gold nanoparticles (NaBH 4 Solution preparation method: 0.025g NaBH 4 Dissolve in 20ml of water to obtain NaBH with a concentration of 1.25mg / ml 4 solution; trisodium citrate solution preparation method: 0.224g trisodium citrate is dissolved in 20ml water)

Embodiment 1

[0031] 1. The preparation method of PS@Au, comprising the following steps:

[0032] (1) Dissolve 0.5g of potassium persulfate and 0.06g of sodium styrene sulfonate in 45ml of water and 165ml of alcohol, and heat it to 70 degrees in an oil bath, so that potassium persulfate and sodium styrene sulfonate can be fully dissolved .

[0033] (2) Prepare a mixed liquid of styrene (1.98ml) and divinylbenzene (0.02ml) with a volume ratio of 99:1, add it to the mixed liquid in (1), start timing at the same time, add 30ml after 2min Prepared gold sol.

[0034] (3) Allow the reaction solution in (2) to react at 70° C. for 4 h, and then stop the reaction to obtain purple PS@Au spheres with Tyndall effect.

[0035] Label the sample as PS@Au, such as figure 1 Its SEM image.

[0036] 2. TiO 2 The preparation method of @PS@Au comprises the following steps:

[0037] (1) The PS@Au pellets prepared in Example 1 were centrifuged and dispersed in absolute ethanol to prepare a 0.01 g / ml PS@Au s...

Embodiment 2

[0044] 1. The preparation method of PS@Au, comprising the following steps:

[0045] (1) Dissolve 0.5g of potassium persulfate and 0.06g of sodium styrene sulfonate in 45ml of water and 165ml of alcohol, and heat it to 70 degrees in an oil bath, so that potassium persulfate and sodium styrene sulfonate can be fully dissolved .

[0046] (2) Prepare a mixed liquid of styrene (1.98ml) and divinylbenzene (0.02ml) with a volume ratio of 99:1, add it to the mixed liquid in (1), start timing at the same time, add 30ml after 2min Prepared gold sol.

[0047] (3) Allow the reaction solution in (2) to react at 70° C. for 4 h, and then stop the reaction to obtain purple PS@Au spheres with Tyndall effect.

[0048] 2. TiO 2 The preparation method of @PS@Au comprises the following steps:

[0049] (1) The PS@Au pellets prepared in Example 1 were centrifuged and dispersed in absolute ethanol to prepare a 0.01 g / ml PS@Au solution.

[0050] (2) Disperse 0.1g polyvinylpyrrolidone (PVP) in a m...

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Abstract

The invention discloses a method for preparing TiO2@Au core-shell structure in a template method. The method comprises the following steps: preparing PS@Au in a template method, coating the PS@Au witha layer of amorphous titanium dioxide to obtain TiO2@PS@Au, and calcining the TiO2@PS@Au to obtain TiO2@Au. PS is used as a template, Au is wrapped in the TiO2, a uniform and stable TiO2@Au core-shell structure can be obtained after the calcinations, and the dispersion property is good. The core-shell structure is a hollow structure, the weight is light, and the surface area is relatively large under the same mass. Nano gold can be combined with various biological macromolecules, the bioactivity is not influenced, the nano gold can be applied to the biological catalysis and biological sensing, the TiO2@Au obtained by the invention can be used as an enzyme reactor, compared with the method only adopting the pure titanium dioxide as the carrier, the separation of the nano gold in the subsequent reaction can be avoided, the advantages of the titanium dioxide semiconductor can be played, and the overall catalytic efficiency can be increased.

Description

technical field [0001] The invention relates to a template method for preparing TiO 2 @Au core-shell structure method, a TiO with uniform size is prepared by PS synthesis as a template 2 @Au core-shell structure. Background technique [0002] As a semiconductor material, titanium dioxide has been widely used in the field of photocatalysis. However, due to its wide band gap and high probability of electron-hole recombination, its photocatalytic performance has not been greatly improved. Therefore, doping noble metals and increasing the proportion of high-energy surface preparation have become popular methods to improve the photocatalytic performance of titanium dioxide. Doping gold into titanium dioxide can increase its absorption of ultraviolet light, and can effectively separate electrons and holes; increasing the proportion of high-energy surfaces can mainly make it generate more ultraviolet light when it receives light. electrons and holes to achieve the purpose of imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52
Inventor 阳晓宇王雪琴肖洒王永陈丽华李昱王洪恩吴旻刘婧室黎新肖冰玉
Owner WUHAN UNIV OF TECH
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