Noble metal directional loaded titanium dioxide photocatalyst and preparation method thereof

Abstract

The invention discloses a noble metal orientation load titanium dioxide photocatalyst and a preparation method thereof. A titanium dioxide carrier has a rutile phase structure and a uniform spherical appearance, wherein the microsphere diameter is about 10 to 16 mu m; the surface is cracked; the titanium dioxide carrier is formed by self-assembling nanowires with the length of 5 to 8 mu m and diameter of 3 to 6 mu m; and the exposed surface of each nanowire is a crystal face (110). The noble metal is one or more of platinum, gold, ruthenium, rhodium, silver and palladium; the load quantity of the noble metal is 0 to 3 percent of the mass of the titanium dioxide carrier; the noble metal exists in the form of a zero-valence simple substance; the grain size of the noble metal is 2 to 10 nm; and the noble metal is orientationally deposited on the crystal face (110) of the titanium dioxide nanowires. The noble metal load titanium dioxide material serving as an effective photocatalyst is applied to light degradation of organic pollutants in a waste water solution.

Description

technical field [0001] The invention relates to a noble metal directional loaded titanium dioxide photocatalyst in the field of semiconductor photocatalysis and a preparation method thereof. Background technique [0002] Under the background of global energy shortage and environmental deterioration, people have to speed up the pace of new energy development and environmental protection, so the development and utilization of solar energy has attracted great attention from all countries in the world. Among them, photocatalytic technology has the advantages of direct utilization of solar energy, low cost of catalytic materials, environmental friendliness, and no secondary pollution, and has become a key research object in the field of energy and environmental protection. With the rapid development of photocatalysis technology, photocatalysis is forming an independent research field, and has played an important role in solar energy conversion, synthesis of new substances and env...

AI Technical Summary

Problems solved by technology

However, the energy band structure of titanium dioxide itself determines that it still has some defects in the application of photocatalytic technology: (1) The band gap of titanium dioxide is wide (3.0eV for rutile, 3.2eV for anatase), and the spectral response range is narrow , the light absorption wavelength is mainly concentrated in the ultraviolet region (<387.5nm), and the ultraviolet light radiated to the ground only accounts for about 5% of sunlight, so from the perspective of utilizing solar energy, the efficiency of titanium dioxide in utilizing solar energy is very low

(2) The recombination rate of photogenerated carriers is high, resulting in low quantum efficiency. The quantum efficiency of conventional titanium dioxide semiconductor photocatalysts is only about 4%.

(3) There is deactivation phenomenon in the process of photocatalytic oxidation of some volatile organic pollutants by titanium dioxide, which greatly restricts its industrial application

However, there are still big problems in the structure and loading method of noble metal-supported titanium dioxide materials, which seriously restrict the improvement of photocatalyst performance and its practical application.

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