Synergistic degradation of organic pollutants on CoFe2O4/rGO nanocomposites by peroxymonosulfate activation under LED irradiation

The possible catalytic degradation mechanism of CFOG/LED/PMS system. • The optimal CoFe 2 O 4 /rGO nanocomposites exhibited excellent catalytic performance as the catalyst in the coupled system of LED-induced photocatalysis and PMS activation for the degradation of CBZ. • The radical quenching experiments, ESR experiments and XPS analysis were utilized to investigate the degradation mechanism of oxidizing CBZ in CFOG/LED/PMS system. The results confirmed that cobalt species, iron species and oxygen species are involved in the catalytic process, and ∙ O 2 - and S O 4 ∙ - were the main active species in the CFOG/LED/PMS degradation process. • The degradation intermediates were identified by HPLC-MS, and the plausible degradation pathways on the CBZ oxidation were proposed. • The degradation experiments of Antibiotic (Tetracycline) and Dyes (RhB, Congo Red) was also conducted to further illustrate the wide applicable of the CFOG/LED/PMS system. A series of cobalt ferrite/reduced graphene oxide (CoFe 2 O 4 /rGO, CFOG) magnetic nanocomposites were synthesized, and the morphological, structural, and surface chemical properties were characterized. The as-prepared materials exhibited excellent photocatalytic activity under LED illumination, and could also be applied as catalyst of SR-Fenton system to generate sulfate radical for the degradation of organic pollutants. Herein, we constructed a CFOG/LED/PMS system for the activation of peroxymonosulfate (PMS) to degrade organic contaminants under LED irradiation. The effects of key factors (PMS concentration, catalyst dosage, initial pH) were evaluated through the degradation of Carbamazepine (CBZ) in CFOG/LED/PMS system. Besides, the radical quenching experiments, ESR experiments and XPS analysis were utilized to investigate the degradation mechanism of oxidizing CBZ in CFOG/LED/PMS system. And the possible degradation pathways were proposed by the intermediates detected by HPLC-MS. The excellent degradation performance of Tetracycline, Rhodamine B, and Congo Red further confirmed that CFOG/LED/PMS system possessed wide applicable for the removal of organic pollutants, providing a promising option for the wastewater treatment technology.