Floral Beta-Bi2O3@CoO heterojunction photocatalyst, preparation method and application thereof
A photocatalyst, -bi2o3 technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the limitation of photocatalytic technology, it is difficult to use visible light parts, etc. problem, to achieve the effect of rich porous structure, outstanding redox ability, good stability and reusability
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Embodiment 1
[0033] (1) Flower-shaped β-Bi 2 o 3 Preparation of @CoO Heterojunction Photocatalyst
[0034] 1.25g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 10 mL of acetic acid, and then 12.5 mL of ethanol was added to form a white suspension. After stirring for 45min, add 25mL of N,N-dimethylformamide and continue stirring until the solution is clear. Transfer to a 100 mL Teflon-lined autoclave and keep at 100 °C for 40 min. After cooling to room temperature, the collected white powder samples were washed with water and ethanol, and dried in an oven at 80 °C. The obtained white precursor was heated in a muffle furnace at 2°C / min to 350°C for 4h to obtain β-Bi 2 o 3 powder.
[0035] 0.5g β-Bi 2 o 3 Disperse in 20mL deionized water, add 0.083g Co(CH 3 COO) 2 4H 2O, and continued to stir for 24h. Subsequently, the mixture was evaporated to dryness at 60°C. in N 2 Under protection, the temperature was raised to 350°C at 2°C / min and calcined for 2 hours to obtain β-Bi 2 o 3 @CoO c...
Embodiment 2
[0045] (1) Degradation of organic pollutants under visible light irradiation
[0046] The β-Bi prepared by 20mg embodiment 1 2 o 3 @CoO was dispersed in 50mL of 10mg / L TC, CTC or OTC aqueous solution. Before light exposure, the suspension was magnetically stirred for 30 min in the dark to achieve adsorption-desorption equilibrium. Subsequently, irradiate the suspension with a 300W xenon lamp (λ≥420nm), collect 5mL of the suspension every 20min, centrifuge to remove the catalyst, measure the concentration with a UV-Vis spectrophotometer, and calculate the degradation rate, the result is as follows Figure 7a , Figure 7b and Figure 7c .
[0047] Under visible light irradiation, the prepared β-Bi was evaluated by catalytic degradation of TC, CTC, OTC in aqueous solution, respectively 2 o 3 Photocatalytic activity of @CoO composites. Figure 7a As shown, after 60min, β-Bi 2 o 3 The degradation efficiency of TC by @CoO is about 86%, while β-Bi 2 o 3 The degradation ra...
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