Preparation method of sulfur-doped cobalt ferrite catalyst

The invention discloses a preparation method of a sulfur-doped cobalt ferrite catalyst. The preparation method comprises the following steps: crushing 50 g of pyrite to reach 10-50 meshes, adding 20-30 g of soda ash, performing uniform stirring by using a stirrer, placing the obtained mixture in a muffle furnace, calcining the mixture at 800-1000 DEG C for 2-4 h, adding the calcined mixture into 100-200 mL of a sodium hydroxide solution with the concentration being 0.2-0.5 mol/L, adding 15-35 mL of commercial sodium hypochlorite containing 10 mass% of effective chlorine while strong stirring,continuously performing strong stirring for 2-3 h, adding 1-3 g of cobalt chloride, continuously performing stirring for 2-4 h, performing solid-liquid separation, removing the obtained supernatant, washing the obtained solid with distilled water 3-4 times, drying the washed solid at 105 DEG C, calcining the dried solid in the muffle furnace at 450-650 DEG C for 4-5 h, and cooling the calcined solid to room temperature in