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Rapid preparation method of titanium dioxide supported gold nanoparticles at normal temperature

A technology of gold nanoparticles and titanium dioxide, which is applied in the field of rapid preparation of titanium dioxide-loaded gold nanoparticles at room temperature, can solve the problems of non-repeatable materials, limited application of titanium dioxide, and long preparation process time, etc., to achieve good preparation and repeatability properties, good aqueous solution stability, and high visible light absorbance

Active Publication Date: 2020-12-08
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Titanium dioxide has two crystal structures, which are rutile phase and anatase phase. Among them, the semiconductor band gap of the rutile phase is 3.0eV; the semiconductor band gap of the anatase phase is 3.2eV; this determines Regardless of the configuration phase, titanium dioxide can only absorb photon energy in the ultraviolet band, and the ultraviolet light content in the solar spectrum is less than 10%, which limits the application of titanium dioxide in photocatalysis to a large extent.
For the method of supporting metals, there are mainly photoreduction, precipitation deposition method (chemical reduction), high-energy ray reduction and other methods at present. The main problems are that the preparation conditions are harsh, the preparation process takes a long time, and the dispersion cannot be obtained. How to prepare uniformly dispersed metal-loaded titanium dioxide nanoparticles quickly and reproducibly under mild conditions is worth further discussion and research.

Method used

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  • Rapid preparation method of titanium dioxide supported gold nanoparticles at normal temperature
  • Rapid preparation method of titanium dioxide supported gold nanoparticles at normal temperature
  • Rapid preparation method of titanium dioxide supported gold nanoparticles at normal temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) In a beaker with no water residue, drop 1ml of tetrabutyl titanate (TBOT) into 22.5ml of polyethylene glycol (EG), and stir at room temperature for 10h, the solution gradually changes from milky white to colorless and transparent; Add 100ml of acetone to the beaker with no water remaining, and add 0.4ml of glacial acetic acid and 1.25ml of deionized water to it, mix well, pour the above colorless transparent solution into it, and stir at room temperature for 3h, the solution changes from colorless to Transparency gradually becomes milky white;

[0031] 2) Place the above reaction solution in a centrifuge tube for high-speed centrifugation at a speed of 8000r / min for 30 minutes; discard the supernatant, resuspend the precipitate with 100ml of absolute ethanol, and centrifuge again at the same speed as above; take the upper layer Discard the supernatant, resuspend the precipitate with 100ml of deionized water, and centrifuge again at the same speed as above; after wash...

Embodiment 2

[0047] This example provides the prepared Au@TiO 2 The testing method of NPs nanoparticle ultraviolet-visible absorption spectrum, described preparation method comprises the following steps:

[0048] Take the prepared Au@TiO 2 Dilute NPs nanoparticles with water according to an appropriate ratio (until the solution is in a transparent state), place them in a cuvette, place them in the test groove of a UV-Vis spectrophotometer, and adjust the test wavelength to 800nm-350nm for scanning to obtain Au@TiO 2 UV-Vis absorption spectra of NPs nanoparticles.

[0049] The ultraviolet-visible absorption spectrum test method of titanium dioxide nanoparticles is consistent with the above-mentioned method.

[0050] The Au@TiO prepared in this specific example 2 The characterization results of NPs nanoparticles UV-Vis absorption spectrum are as follows:

[0051] Such as Figure 5 Shown is the Au@TiO prepared in this example 2 NPs nanoparticles and TiO 2 The ultraviolet-visible ...

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Abstract

The invention discloses a rapid preparation method of titanium dioxide supported gold nanoparticles at normal temperature. The method comprises the following steps: dropwise adding tetrabutyl titanateTBOT into polyethylene glycol (EG) of which the volume is 20 times that of TBOT or more, and stirring at room temperature for 5 hours or more; putting the reaction solution into a centrifuge tube forhigh-speed centrifugation, resuspending the precipitate by using absolute ethyl alcohol of which the volume is 80 times that of TBOT or more, and centrifuging again; uniformly mixing VC of which themass is 2-3 times that of TBOT and polyvinylpyrrolidone into an aqueous solution of which the volume is 200 times that of TBOT or above, adding a chloroauric acid solution of which the volume is 2-3 times that of TBOT and the concentration is 1 mM into the solution at a time, and performing continuous stirring so that rapid preparation can be completed, and gold nanoparticles of different loadingcapacities are freely loaded on titanium dioxide.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterials, and in particular relates to a rapid preparation method of titanium dioxide-loaded gold nanoparticles at normal temperature. Background technique [0002] Titanium dioxide is a classic light-responsive semiconductor material discovered earlier and still used today. It has been widely developed and used in the field of photoelectrochemistry due to its stable physical and chemical properties and good separation efficiency of photogenerated carriers. Titanium dioxide has two crystal structures, which are rutile phase and anatase phase. Among them, the semiconductor band gap of the rutile phase is 3.0eV; the semiconductor band gap of the anatase phase is 3.2eV; this determines Regardless of the configuration phase, titanium dioxide can only absorb photon energy in the ultraviolet band, and the ultraviolet light content in the solar spectrum is less than 10%, which largely limits t...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/02
CPCB01J23/52B01J35/394B01J35/50B01J35/39
Inventor 李文博姚颖方李梦璐宋文涛吴聪萍邹志刚
Owner NANJING UNIV
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