Patent ID: 11951460
Assignee: TAIYUAN UNIVERSITY OF TECHNOLOGY
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A preparation method of a tailings-based zeolite@carbon dots-titanium dioxide (CDs-TiO2) composite photocatalyst, comprising:
step 1: tailings pretreatment, comprising: performing an acidification treatment on tailings powder by immersing the tailings powder into acid liquor and stirring evenly to obtain acidified tailings powder; roasting the acidified tailings powder at a temperature of 700-900 Celsius degrees (° C.) under a nitrogen (N2) preservation and then keeping the temperature unchanged to obtain modified tailings powder; wherein the acidification treatment comprises: adding the tailings powder into diluted hydrochloric acid with a molar concentration of 1 molar per liter (M) and performing an ultrasonic treatment on the diluted hydrochloric acid added with the tailings powder for 1.5-2.5 hours (h);
step 2: adding titanium dioxide (TiO2) and the modified tailings powder into lye sequentially and stirring to obtain a mixed suspension, wherein a weight ratio of the TiO2 and the modified tailings powder is in a range of 0.5-1; and stirring and aging the mixed suspension for 8-16 h under a condition of ultraviolet irradiation to obtain an aged suspension; wherein a light intensity of the ultraviolet irradiation is in a range of 10-20 milliwatts per square centimeter (mW/cm2); and the lye is sodium hydroxide (NaOH) solution with a molar concentration of 1-3 M; and
step 3: performing a hydrothermal reaction on the aged suspension to obtain a product, filtering the product to obtain a filtered product, and washing and drying the filtered product to obtain the tailings-based zeolite@CDs-TiO2 composite photocatalyst; wherein a temperature of the hydrothermal reaction is in a range of 115-125° C., and a period of the hydrothermal reaction is in a range of 20-30 h.