Preparation and application of hollow tree-like bismuth oxide-bismuth sulfide complex

Abstract

The invention provides a method for preparing a hollow dendritic bismuth oxide-bismuth sulfide composite: (1) Stir and dissolve bismuth nitrate pentahydrate in dilute nitric acid, and then use a quantitative alkali solution to adjust the pH value of the bismuth nitrate solution to 9- 14; Then transfer the solution to the crystallization reactor, react at 80-200°C for 0.5-12 hours, cool, filter and separate, wash with deionized water, wash with absolute ethanol, dry and roast, to obtain hollow tubular bismuth oxide; ( 2) Disperse the hollow tubular bismuth oxide prepared above in deionized water, add water-soluble sulfide under stirring, control the molar ratio of bismuth oxide to sulfide to 1:[1~8], and then transfer the resulting solution to a crystal In a reaction kettle, react at 40-180°C for 0.5-36 hours, cool, filter and separate, wash three times with deionized water, wash with absolute ethanol, and dry to obtain a hollow dendritic bismuth oxide-bismuth sulfide composite. The invention also relates to the application of the hollow dendritic bismuth oxide-bismuth sulfide composite as a photocatalyst.

Description

[Technical field] [0001] The invention relates to the field of catalysts, in particular to the preparation and application of a hollow dendritic bismuth oxide-bismuth sulfide photocatalyst. [Background technique] [0002] With the development of society, the problem of energy shortage and environmental pollution has been paid more and more attention. Solving these two problems is an urgent need to achieve sustainable development. Solar energy is a kind of clean, inexhaustible energy source, so the full utilization of solar energy is considered to be one of the most likely ways to solve these two problems. Photocatalytic materials have important application prospects in the use of sunlight to photolyze water to produce hydrogen and eliminate organic pollutants. Traditional photocatalytic material TiO 2 Because of its wide band gap, it can only absorb ultraviolet light in sunlight, and its utilization efficiency of sunlight is low. In recent years, BiWO 6 , Bi 2 o 3 , Bi...

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Problems solved by technology

[0005] However, the method of synthesizing these special morphology monoclinic bismuth oxides usually requires the introduction of organic solvents, surfactants, organic structure-directing agents, etc., because the introduction of these organic substances not only increases the difficulty of the post-processing process and pollutes the environment, but also Organic intermediates that are more toxic and harmful than these organics are more likely to be produced during material synthesis

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