Preparation method of silver carbonate compounded silver bromide photocatalyst

Abstract

The invention discloses a preparation method of a silver carbonate compounded silver bromide photocatalyst. The preparation method particularly includes the steps: weighing 12-16mmol of silver nitrate to prepare into 15mmol / L silver nitrate solution, and weighing 6.6-8mmol of sodium carbonate to prepare into 20mmol / L sodium carbonate solution; mixing the silver nitrate solution and the sodium carbonate solution at the rotating speed of 350-400 revolutions / minute to form gelatinous substances, continually stirring the gelatinous substances for 3-4h, and enabling the sodium carbonate and the silver nitrate to react in the stirring process to generate silver carbonate colloids; washing the silver carbonate colloids in semi-permeable membrane bags for 3-4 times by the aid of distilled water to remove free ions, adding the silver carbonate colloids into 160-180mL of sodium bromide solution with the concentration of 1-2mol / L to soak for 2-4 days, forming silver bromide nano-particles on the surfaces of silver carbonate particles, performing solid-liquid separation, washing the solid for 2-3 times by the aid of distilled water, and drying the solid at the temperature ranging from 75 DEG C to 105 DEG C to prepare the silver carbonate compounded silver bromide photocatalyst. According to the method, the catalyst is formed on the surface of a carrier, and the catalyst and the carrier are closely combined.

Description

technical field [0001] The invention relates to a preparation method of a silver carbonate composite silver bromide photocatalyst, belonging to the technical field of sewage treatment in environmental protection. Background technique [0002] Traditional water treatment methods have problems such as low efficiency, high cost, and secondary pollution, and sewage treatment has not been well resolved. The development and application of nanotechnology is likely to completely solve this problem. TiO was discovered in 1972 2 High oxidation activity, good chemical stability, non-toxic to the human body, low cost, no pollution, wide application range, so it is the most important, but TiO 2 The bandgap width is large (such as anatase TiO 2 The forbidden band width Eg=3.2eV), can only absorb the light in the ultraviolet region (wavelength less than 387nm), and the utilization efficiency of solar energy is low. [0003] Semiconductor photocatalysis is one of the most promising appr...

AI Technical Summary

Problems solved by technology

However, due to the limitation of its own characteristics, the performance of silver carbonate needs to be improved in terms of photocatalytic degradation.