| abstract |
The invention provides a photocatalytic system containing ɑ-MnO 2 , its preparation method and application, and belongs to the technical field of photocatalysts. The photocatalytic system includes ɑ-MnO 2 and NaHSO 4 , the mass ratio of NaHSO 4 to ɑ-MnO 2 is 0.05-1:1; ɑ-MnO 2 is prepared by the following method: KMnO 4 is dissolved in deionized water, Drop into the aqueous solution containing MnSO 4 ·H 2 O under stirring to obtain a mixed slurry, transfer it to a stainless steel autoclave lined with polytetrafluoroethylene, and keep it in an oven at 130-145°C for 10-13h; the mixed slurry After the material is cooled, it is filtered and washed, dried in an oven, and calcined in an air atmosphere at 280-320°C for 1.5-2.5 hours in a muffle furnace to obtain ɑ-MnO 2 . The invention has high photocatalytic efficiency, obvious degradation effect on various organic substances, high degradation efficiency and simple system operation. |