Activation of peroxymonosulfate by palygorskite supported Co-Fe for water treatment

In the present work, palygorskite (PAL) supported Co-Fe oxides (CoFe@PAL) were prepared and used as a peroxymonosulfate (PMS) activator for removal of rhodamine B (RhB) in water. The results showed that CoFe@PAL prepared at impregnation solution of 50 g L-1 and calcination temperature of 500 degrees C showed the best catalytic performance. The removal efficiency of RhB (10 mg L-1) by PMS (0.1 mmol L-1) activated with CoFe@PAL (1 g L-1) was above 98% within 60 min. The effects of various environmental factors including initial pH, humic acid (HA) and inorganic anions on the removal effect were simultaneously investigated. The radical quenching experiments and EPR characterization revealed that OH, SO4-, O-2(-) and O-1(2) radicals existed in the CoFe@PAL/PMS system simultaneously. The intermediates during RhB degradation were analyzed by LC-MS and possible degradation pathways of RhB were proposed. Moreover, CoFe@PAL exhibited superior stability and reusability.

Automated summary

In this study, palygorskite supported cobalt-iron oxides (CoFe@PAL) were prepared and used as an activator for peroxymonosulfate (PMS) to remove rhodamine B (RhB) from water. The optimal catalytic performance was achieved for CoFe@PAL prepared with an impregnation solution concentration of 50 g L-1 and calcination temperature of 500 degrees C. The removal efficiency of RhB (10 mg L-1) by PMS (0.1 mmol L-1) activated with CoFe@PAL (1 g L-1) exceeded 98% within 60 minutes. The study also investigated the effects of various environmental factors on the removal efficiency, and identified the presence of multiple radicals in the CoFe@PAL/PMS system.