Anatase type TiO2 nanocrystalline with co-exposed {101}, {100} and {111}-crystal faces

Abstract

The invention discloses a preparation method and application of anatase type TiO2 nanocrystalline with co-exposed {101}, {100} and {111} crystal faces. According to the method, tetraisopropyl titanateis used as a titanium source, absolute ethyl alcohol is used as a solvent, hydrofluoric acid or hydrofluoric acid and hydrogen peroxide are used as a morphology control agent, and the square anatasetype TiO2 nanocrystalline with co-exposed {101}, {100} and {111} crystal faces are synthesized through a sol-gel method. The prepared square anatase type TiO2 can be applied to photocatalytic degradation of organic pollutants such as rhodamine B, methylene blue and p-nitrophenol, and can also be applied to solar cells and cosmetics. The preparation method provided by the invention has the advantages of simple process, short production period, strong controllability and low synthesis cost, meets the requirements of green chemistry, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of nanocrystalline materials, in particular, it relates to anatase-type TiO with exposed {101}, {100} and {111}-crystal planes 2 Preparation methods and applications of nanocrystals. Background technique [0002] In 1972, Japanese scientists Fujishima and Honda discovered that TiO 2 The electrode can photolyze water to produce H 2 , This report has aroused the attention of scientists from all over the world. Given TiO 2 It has the advantages of biological and chemical inertness, strong photooxidative ability, long-term stability to light and chemical corrosion, non-toxic, non-polluting and low price, making it widely used in photocatalysis, air purification, lithium-ion batteries, solar cells, water It has potential application prospects in purification and other aspects, and is expected to solve the world's energy and environmental crises. TiO 2 There are mainly three crystal forms in nature: anatase,...

AI Technical Summary

Problems solved by technology

[0004] In recent years, it has been reported that the preparation of preferentially exposed {010} or {111}-faceted anatase TiO 2 Some methods, such as, using layered titanate as precursor, through proton exchange, intercalation reaction, exfoliation reaction, prepared anatase type with different morphology exposed {010} or {111}-crystal plane TiO 2 nanocrystals, but the preparation process takes a long time, and the concentrated hydrochloric acid used in the preparation process is a dangerous chemical with a large amount, and the stripping reagent tetramethylammonium hydroxide used is expensive and difficult to produce on a large scale; TiF 4 As the titanium source, ammonia water is used as the morphology control agent to prepare square plate-shaped anatase TiO with exposed {111} crystal facets. 2 Microcrystalline, but the TiF used in the preparation of the microcrystalline 4 Very fast hydrolysis, difficult to control during experiments and expensive

Above-mentioned reason causes the price of obtained product higher, is difficult to industrialized large-scale production

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