Preparation method of nano TiO2-SnO2 solid solution photocatalytic material

Abstract

The invention relates to a preparation method of a nano TiO2-SnO2 solid solution photocatalytic material. Low-corrosion potential elements or an amorphous alloy with a Ti / Sn atomic ratio of 4:1 to 6:1are adopted as a precursor, nitric acid is adopted as a corrosive and an oxidant, and a nano TiO2-SnO2 solid solution is synthesized through de-alloying oxidation. The method comprises the followingspecific steps: (1) selecting four metal raw materials including Cu, Ti, Sn and low-corrosion potential active elements or three metal raw materials including Cu, Ti and Sn, and smelting the metal rawmaterials through a vacuum arc furnace to prepare an alloy melt ingot; (2) heating the alloy melt ingot by utilizing a magnetic induction coil of vacuum rotary quenching equipment, and spraying alloyliquid to the surface of a copper roller rotating at a high speed when the alloy is completely molten, so as to obtain an amorphous strip; and (3) under the condition of constant temperature, performing de-alloying oxidation treatment on the amorphous strip in a nitric acid solution. The method is simple to operate, use of a large amount of solutions and harsh reaction conditions are not involved, the minimum unit particle size of the prepared material is 3.5-6 nm, and the catalytic degradation efficiency of the prepared material on rhodamine B under 500 W ultraviolet light reaches 99% or above.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, in particular to a nano-TiO 2 -SnO 2 Preparation method of solid solution photocatalytic material. Background technique [0002] Wide bandgap n-type semiconductor TiO 2 (E g =3.0~3.2eV) and SnO 2 (E g =3.6eV) not only has high photocatalytic activity, stable chemical properties, but also is cheap, green and pollution-free, and is considered to be a photocatalytic material with great potential, and the TiO formed based on the two 2 -SnO 2 The solid solution also has semiconductor synthesis effect and special electronic structure, so it has more excellent photocatalytic performance. It is worth mentioning that TiO 2 and SnO 2 They are very similar in terms of crystal structure characteristics, and the ionic radius and electrical characteristics are also very similar to each other, which is the reason for the formation of TiO 2 -SnO 2 Solid solutions provide fa...

AI Technical Summary

Problems solved by technology

However, TiO 2 -SnO 2 The synthesis of solid solution needs to be realized by adding Sn element to Cu-Ti amorphous alloy. Sn element has a strong corrosion retarding effect, which will greatly increase the sample preparation cycle (extended from 2 days to 7 days), causing TiO 2 -SnO 2 The coarsening behavior of the solid solution, which in turn adversely affects the photocatalytic activity of the material

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