Composite catalyst with titanium dioxide coated gold nanocage structure, as well as preparation method and application of composite catalyst

Abstract

The invention relates to a composite catalyst with a titanium dioxide coated gold nanocage structure, as well as a preparation method and application of the composirte catalyst. The composite catalyst comprises an inner core and an outer layer, wherein the inner core is a hollow gold nanocage with a particle size being 200-500nm; the outer layer is a nano titanium dioxide coated layer with a thickness being 5-20nm. According to the composite catalyst, a large quantity of gaps are formed in a gold nanocage layer and a TiO2 nanolayer; by virtue of the gaps, the diffusion of reactants and products can be accelerated; the composite catalyst is capable of firmly limiting the reactants in the inner space and enabling the reactants to reach the extremely-high concentration condition, thereby accelerating catalytic reaction; meanwhile, the composite catalyst is high in reaction activity, small in possibility of catalyst poisoning and capable of greatly improving the catalytic performance, so that the composite catalyst can be widely used in a plurality of composite structural materials with oxides-coated metals.

Description

technical field [0001] The present invention relates to inorganic nanomaterials and catalytic organic pollutant degradation technology, specifically, a kind of AuTiO 2 Composite catalyst with nanocage structure (gold nanocage structure coated with titanium dioxide) and its preparation method and application in catalytic reduction of 4-nitrophenol. Background technique [0002] Hollow materials have attracted the attention of many scientists because of their excellent properties such as low density, high specific surface area, low thermal expansion coefficient, and low refractive index. Among them, the research on hollow nanospheres is the most in-depth. The practical technology of nano-hollow spheres has gradually matured and gradually become practical. Due to its irregular shape and anisotropy, non-spherical hollow structure materials are increasingly used in biomedicine, targeted drug release, energy storage, etc. play an important role. [0003] Gold nanocage structure...

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Problems solved by technology

[0005] However, due to the angular effect of non-spherical metal structures such as gold nanocages, it is very difficult to uniformly coat the oxide layer on the surface, and there are no relevant research reports so far.

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