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TiO2/Au nano-rod urchin-like heterostructure photocatalyst and preparation method thereof

A heterostructure, photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high semiconductor carrier recombination rate and solar energy utilization. Low efficiency, low photon efficiency and other problems, to achieve the effect of excellent anti-reflection characteristics, stable and efficient visible light catalytic performance, and large specific surface area

Active Publication Date: 2016-12-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, pure TiO 2 There are still two problems to be solved urgently in the practical application of catalysts: first, the utilization efficiency of solar energy is low, TiO 2 The absorption of light is mainly in a short section of the ultraviolet region, and only 4% of the solar spectrum can be used for light energy; second, the recombination rate of semiconductor carriers is high, and the photon quantum efficiency is low
But this method is difficult to obtain other shapes of gold nanoparticles
So far, no solution-phase noble metal nanorods have been used to modify TiO on the outside. 2 heterostructure reports

Method used

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  • TiO2/Au nano-rod urchin-like heterostructure photocatalyst and preparation method thereof
  • TiO2/Au nano-rod urchin-like heterostructure photocatalyst and preparation method thereof
  • TiO2/Au nano-rod urchin-like heterostructure photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A colloidal solution of Au nanorods (AuNR) was prepared using CTAB as a surfactant (the diameter of AuNR was 10nm, the length was 44nm, and the concentration of Au atoms was 0.492mM). Centrifuge 8 mL of Au nanorod (AuNR) colloidal solution at 7000 rpm for 8 minutes, then remove the lower layer concentrate (volume is 0.2 mL, the mass of which contains Au nanorods (AuNR) is 0.78 mg), and then add 30mL of deionized water, after stirring at room temperature for 10min, add 0.5mL of 5mg / mL titanium tetrafluoride aqueous solution. The mixture was stirred at room temperature for 30 minutes, and then heated at 100°C for 6 hours to obtain lavender TiO 2 / AuNR sea urchin-like heterostructure photocatalyst, the product mass is 1.1mg.

[0021] Example 1 performance test

[0022] Take 4mg of TiO prepared by the invention 2 / Au nanorods (AuNR) sea urchin-like heterostructure photocatalyst was added to 4mL of rhodamine B aqueous solution (5ppm), and allowed to stand for 30min at room tempe...

Embodiment 2

[0028] A colloidal solution of AuNR was prepared using CTAB as a surfactant (the diameter of AuNR is 16 nm, the length is 40 nm, and the concentration of Au atoms is 0.492 mM). After centrifuging 8mL of AuNR colloid solution at 8000rpm for 10 minutes, remove the lower concentrated solution (volume is 0.2mL, the mass of which contains AuNR is 0.78mg), then add 30mL of deionized water and stir for 10min at room temperature. Then add 0.5 mL of 5 mg / mL titanium tetrafluoride aqueous solution. The mixture was stirred at room temperature for 30 minutes, and then heated at 100°C for 6 hours to obtain lavender TiO 2 / AuNR sea urchin-like heterostructure photocatalyst, the product mass is 1.1mg.

[0029] Attached Figure 5 Is the obtained TiO 2 / AuNR transmission electron micrograph of sea urchin-like heterostructure photocatalyst. As shown in the figure, a uniform sea urchin-like structure is displayed in a large area, with an average diameter of 200 nm; among them, AuNR is uniformly m...

Embodiment 3

[0031] A colloidal solution of AuNR was prepared using CTAB as a surfactant (the diameter of AuNR is 18nm, the length is 47nm, and the concentration of Au atoms is 0.492mM). After centrifuging 8 mL of AuNR colloidal solution at 6000 rpm for 8 minutes, remove the lower concentrated solution (the volume is 0.2 mL, and the mass containing AuNR is 0.78 mg), then add 30 mL of deionized water, and stir at room temperature for 10 minutes. Then add 0.5 mL of 5 mg / mL titanium tetrafluoride aqueous solution. The mixture was stirred at room temperature for 30 minutes, and then heated at 100°C for 6 hours to obtain lavender TiO 2 / AuNR sea urchin-like heterostructure photocatalyst, the product mass is 1.1mg.

[0032] TiO 2 The average diameter of / AuNR sea urchin-like heterostructure photocatalyst is 200nm; among them, AuNR is uniformly modified in TiO 2 On the surface, the diameter of AuNR is 18nm and the length is 47nm.

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Abstract

The invention relates to a TiO2 / Au nano-rod urchin-like heterostructure photocatalyst and a preparation method thereof, and belongs to the technical field of semiconductor photocatalysts. The method comprises the following steps: concentrating 8-16 mL of an Au nano-rod colloid solution with the Au nano-rod mass being 0.78-1.56 mg in a centrifuge manner to make the final volume be 2-3% of the original volume, adding 10-30 mL of deionized water to a lower layer concentrate product, carrying out room temperature stirring for 10-20 min, adding 0.5-1 mL of an aqueous titanium salt solution with the concentration of 5-10 mg / mL, continuously stirring the above mixture at room temperature for 30-50 min, and heating the stirred mixture at 100-130 DEG C for 2-6h to obtain the lavender TiO2 / Au nano-rod urchin-like heterostructure photocatalyst. The TiO2 / Au nano-rod urchin-like heterostructure photocatalyst prepared in the invention has a strong SPR absorption effect on Au nano-rods in the visible light region, has excellent anti-reflection characteristic, and can capture sunshine, AuNR can improve the separation efficiency of photoinduced electrons and holes, and the urchin-like structure has a large specific surface area, so the increase of the catalysis efficiency of the photocatalyst is facilitated.

Description

Technical field [0001] The invention belongs to the technical field of semiconductor photocatalysts, and specifically relates to a TiO 2 / Au nanorod sea urchin-like heterostructure photocatalyst and preparation method thereof. Background technique [0002] Photocatalytic oxidation technology is considered to be one of the most promising technologies for solving environmental pollution problems. So far, more than 3000 hard-to-degrade organic compounds have been found to be rapidly degraded by photocatalytic oxidation. Among the semiconductors commonly used in photocatalytic technology, TiO 2 The preparation cost is relatively low, and it has the advantages of mild reaction conditions, high chemical stability, safety, non-toxic side effects, long service life, etc., which has attracted more and more attention. Currently, pure TiO 2 In the actual application of the catalyst, there are still two problems to be solved urgently: First, the utilization efficiency of solar energy is low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/02B01J35/10B01J35/00
CPCB01J21/063B01J23/52B01J35/60B01J35/39
Inventor 孙航曾珊何沁容尹升燕佘萍商殷兴
Owner JILIN UNIV
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