Rapid Degrading Carbamazepine in a Novel Advanced Oxidation Process of Bisulfite Activated by Lithium Cobaltate Recovered from Spent Lithium-ion Battery

Maximizing the sustainable recycling of spent lithium-ion batteries (LIBs) shows economic and environmental significance. This study recovered lithium cobaltate (LiCoO 2 , LCO) from spent LIBs cathode powder. The recovered LCO was then combined with NaHSO 3 to remove refractory organic pollutants of carbamazepine (CBZ) in water. The degradation of CBZ reached 80.0% within 60 min, by 1 O 2 , SO 4 − ⋅ , ⋅ OH and O 2 − ⋅ generated in the LCO/NaHSO 3 reaction. The electron transfer between Co (III) and Co (II) was beneficial to the generation of free radicals. The LCO/NaHSO 3 degraded CBZ effectively in both secondary outlet water and tap water. However, high concentrations of inorganic ions (Cl − , HCO 3 − , HPO 4 2− , SO 4 2− , NO 3 − ) and natural organic matter (humic acid, HA) could inhibit the degradation of CBZ. After three cycles, the stability of the LCO/NaHSO 3 system was demonstrated by the maintained high efficiency in the degradation of CBZ. The obtained data indicate that the LCO/NaHSO 3 system holds great application potential in the field of advanced oxidation degradation of pollutants.