A kind of α/β-bismuth oxide phase heterojunction photocatalyst and its preparation method and application

Abstract

The invention provides an α / β-Bi 2 O 3 Preparation method and use of phase heterojunction photocatalyst. First, dissolve 2-4 mmol of bismuth source material in 70 mL of reducing solvent, stir magnetically at room temperature for 30 min, then add 0-2.0 mL of aniline to the above solution, and continue stirring for 10 min. Transfer the above mixture to the reaction kettle, put it in an oven and perform a solvothermal reaction at 150°C-180°C for 8-12h to obtain a bismuth-based precursor. The precursor is washed, dried, ground, and placed in a muffle furnace to be calcined at 300°C for 0.5-2.0h. The resulting yellow to green powder is α / β-Bi 2 O 3 Phase heterojunction photocatalyst. The α / β-Bi prepared by the present invention 2 O 3 Phase heterojunction photocatalyst is used to degrade organic pollutants in water, which is superior to commercial TiO 2 (P25), pure phase α‑Bi 2 O 3 and pure phase β‑Bi 2 O 3 Isophotocatalysts have higher visible light catalytic activity.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to an α / β-Bi 2 o 3 Preparation method and application of phase heterojunction photocatalyst. Background technique [0002] Photocatalytic technology has the advantages of high efficiency, low cost, no secondary pollution, and easy operation. Using semiconductors as photocatalysts and using sunlight as a light source to photocatalytically degrade organic and inorganic pollutants in air and water environments has already attracted widespread attention. Semiconductor photocatalysts widely used today are mainly transition metal oxides, such as TiO 2 , ZnO, Fe 2 o 3 etc., where TiO 2 It has been extensively studied for its excellent optoelectronic properties. However, TiO 2 still has two defects that limit its practical application: (1) TiO 2 The band gap is 3.2eV, and it can only absorb ultraviolet light with a wavelength below 387nm, and ultraviolet light only accounts for about ...

AI Technical Summary

Problems solved by technology

[0004] However, a single Bi 2 o 3 There are still the following problems: the photogenerated electrons and holes are easy to recombine, and the photocatalytic activity is low

[0010] 1. The synthesis method is complex and the production cost is high;

[0011] 2. The temperature required in the reaction process or calcination process is high, the synthesis time is long, the energy consumption is high, and the synthesis cost is increased;

[0012] 3. The organic solvent (benzyl alcohol) used in the existing preparation process is toxic, has anesthesia effect, has a strong stimulating effect on the eyes, skin and respiratory system, and is harmful to the body if swallowed, inhaled or in contact with the skin;

[0013] 4. The prepared photocatalyst has low activity and cannot achieve efficient and rapid removal of organic pollutants

Images