Titanium dioxide-silver composite core-shell structure sphere and its preparation method and application

Abstract

The invention discloses a titanium dioxide-silver composite ball adopting a core-shell structure as well as a preparation method and an application of the ball. The diameter of a ball shell of the ball adopting the core-shell structure ranges from 0.5 mu m to 1 mu m, the diameter of a ball core ranges from 0.4 mu m to 0.8 mu m, and the ball comprises, in percentage by weight, 85 %-95 % of titanium dioxide and 5 %-15 % of silver; and the ball shell and the ball core are composited by titanium dioxide nano-particles and silver nano-particles, the diameter of each titanium dioxide nano-particle ranges from 8 nm to 12 nm, and the diameter of each silver nano-particle ranges from 20 nm to 100 nm. According to the method, titanyl sulfate, urea and silver nitrate are added into an ethanol water solution with the concentration of 45%-55% according to the molar ratio of (1.5-2.5): (3.5-4.5): (0.044-0.22), and a mixed solution is obtained; the molar ratio of titanyl sulfate in the mixed solution to ethanol in the ethanol water solution is 1: (50-250); and then, the mixed solution is placed in an airtight microwave heating state and reacts at the temperature ranging from 160 DEG C to 200 DEG C, and a target product is prepared. The titanium dioxide-silver composite ball can be widely applied to ultraviolet light catalytic degradation of water polluted by hexavalent chromium or methylthionine chloride.

Description

technical field [0001] The invention relates to a composite core-shell structure sphere and its preparation method and application, in particular to a titanium dioxide-silver composite core-shell structure sphere and its preparation method and application. Background technique [0002] As a traditional wide bandgap semiconductor material, titanium dioxide (TiO 2 ) has the advantages of stable properties, non-toxicity, and good light absorption performance, and has been widely used in photocatalytic treatment of environmental pollutants. In recent years, with the development of nanotechnology, people have applied it to titanium dioxide to obtain nano-titanium dioxide with higher light utilization efficiency, such as the Chinese invention patent application CN101857267A published on October 13, 2010. Preparation method of titanium dioxide nanomaterial. The preparation method uses trivalent titanium salt and glucose as basic raw materials to obtain a product through the proce...

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Problems solved by technology

The disadvantage of these methods is that Ag can only be compounded on TiO 2 The surface of the matrix cannot be composited on TiO with a core-shell structure 2 The core surface in the shell of the matrix; the second is that the recombination efficiency of Ag is very low, not only the ratio of recombination is very low, generally less than 10%, which makes it difficult to fully reflect the effectiveness of Ag, and the efficiency of Ag ions converted to Ag during recombination is too low , resulting in the waste of a large amount of Ag sources; the third is that the preparation cycle is very long, which is not suitable for large-scale industrial production

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