Preparation method of gold cluster/TiO2 composite nano material

Abstract

The invention discloses a preparation method of a gold cluster / TiO2 composite nano material, which comprises the following steps of (a) placing TiO2 nanopowder in chloroauric acid aqueous solution and conducting ultrasonic dispersion to obtain solution to be reacted; and (b) heating the solution to be reacted at 125-135 DEG C, adding trisodium citrate solution in an one-off mode under stirring when solution boils, continuously stirring when solution is changed from white to purple, and finally obtaining the gold cluster / TiO2 composite nano material in which TiO2 loads gold cluster structure. The obtained composite nano material has high catalytic activity compared with pure TiO2 nanoparticles, modified electrodes papered by using the composite nano material have strong sensibilization on electrochemical luminescence of luminol, dissolved oxygen and hydrogen peroxide can be sensitively detected, detection limit of the dissolved oxygen can achieve 2mu g / L, and detection limit of the hydrogen peroxide can achieve 5.54'10-12mol / L. Compared with reports capable of consulting at present, detection sensitivity of the dissolved oxygen and the hydrogen peroxide is obviously improved, and unexpected technique effects are achieved.

Description

technical field [0001] The invention relates to a gold atom cluster / TiO 2 Preparation methods of composite nanomaterials. Background technique [0002] Nano-TiO 2 It is a very important semiconductor material, which has the surface effect and long-lasting chemical stability of nanomaterials. It has been widely used in many fields such as photocatalytic degradation and has achieved remarkable research progress. [0003] On the other hand, gold has been considered as a low activity material, but nanoscale gold can exhibit high catalytic activity. Due to the large surface energy of gold nanoparticles, they are easy to agglomerate, and are generally dispersed and loaded on the carrier by impregnation method, but the gold particles prepared by this method are usually larger than 30nm. Supported gold catalysts have good catalytic activity for many reactions, and it is generally believed that the optimal particle size is less than 5nm. Kinetic studies also show that loading on T...

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Problems solved by technology

[0004] Existing supported structures of Au / TiO 2 Composite materials are usually based on mesoporous TiO 2 , Microporous TiO 2 or TiO 2 Nanotubes are used as the carrier, and the deposition-precipitation method is used to prepare the loaded Au; in the composite material obtained by this method, the gold crystal grains loaded are mainly dispersed between the surface of the carrier and the gap between the grains of the carrier, and the gold grains are not uniformly dispersed, and Its catalytic activity is low

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