Method for preparing cobalt carbonate-cobalt phosphate composite photocatalyst

Abstract

The invention discloses a method for preparing a cobalt carbonate-cobalt phosphate composite photocatalyst. The method comprises the following specific steps: weighing 12mmol to 16mmol of cobalt nitrate, preparing a 12mmol / L cobalt nitrate solution, weighing 6.6mmol to 8mmol of sodium carbonate, and preparing a 16mmol / L sodium carbonate solution; mixing the two kinds of solutions at the revolution rate of 350rpm to 400rpm so as to form a colloidal substance, carrying out sustained stirring for 3 to 4 hours, and subjecting sodium carbonate and cobalt nitrate to a reaction during stirring, so as to produce cobalt carbonate colloid; putting the cobalt carbonate colloid in a semi-permeable membrane bag, washing with distilled water for 3 to 4 times so as to remove free ions, then, adding the cobalt carbonate colloid into 60mL to 80mL of 2mol / L to 4mol / L sodium phosphate solution, carrying out soaking for 2 to 4 days so as to form cobalt phosphate nanoparticles on surfaces of cobalt carbonate particles, carrying out solid-liquid separation, washing solids with deionized water for 2 to 3 times, and carrying out drying at the temperature of 75 DEG C to 105 DEG C, thereby preparing the cobalt carbonate-cobalt phosphate composite photocatalyst. According to the method, a catalyst is formed on the surface of cobalt carbonate, and the catalyst and a support are combined tightly.

Description

technical field [0001] The invention relates to a preparation method of a cobalt carbonate composite cobalt phosphate 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 ap...

AI Technical Summary

Problems solved by technology

Due to the limitation of its own characteristics, the performance of cobalt carbonate needs to be improved in terms of photocatalytic degradation