Effect of UV radiation on the enhancement of CO₂ uptake capacity of fly ash catalysed Mg(OH)₂

Abstract The use of low-cost and easily accessible fly ash for CO 2 mineralization and sequestration can effectively control carbon emissions. In this paper, Mg(OH) 2 was used as a reaction catalyst, and ultraviolet radiation was applied to fly ash to enhance its CO 2 uptake capacity. The effects of temperature, catalyst content, and UV radiation time on the CO 2 uptake performance of fly ash under low-concentration CO 2 conditions were studied respectively. The experimental results show that UV radiation can effectively promote the CO 2 uptake capacity of modified fly ash. After adding 0.5 g of Mg(OH) 2 and 24 h UV radiation pretreatment, the CO 2 uptake capacity of fly ash reaches 70.77 g-CO 2 /kg-FA, and the carbonation efficiency is 58.31%.