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

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...

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

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