Chemiluminescence-assisted study on a peracetic acid-based advanced oxidation process activated with CoP.

In recent years, the elimination of organic pollutants by advanced oxidation processes (AOPs) based on peracetic acid (PAA) has drawn increasing attention owing to the high oxidative potential and low byproducts. However, in order to explore more efficient and stable PAA-based AOPs, there is still great room for study on the activation of PAA and degradation mechanism in the reaction process. In this study, a new PAA-based AOP activated by metal-organic frameworks-derived cobalt phosphide (CoP) and accompanied with chemiluminescence (CL) behavior was explored. The CoP/PAA system could efficiently degrade 99.98% of RhB (20 mg L -1 ) within 5 min at pH 7 compared with conventional Co 3 O 4 /PAA system (merely 17.3%), and the degradation process was matched well with the preudo-first-order kinetic, and the kinetic constants was about 23.7 times higher than that of Co 3 O 4 (0.546 min -1 for CoP vs. 0.023 min -1 for Co 3 O 4 ). In CoP/PAA/RhB process, the CL intensity was related to the concentration of 1 O 2 , O 2 •- and acetylperoxyl radicals (CH 3 C(O)OO• and CH 3 C(O)O•). Therefore, CL analysis combined with quenching tests and electron paramagnetic resonance analysis was employed to study the degradation mechanism in detail and 1 O 2 was confirmed as the dominate contributor for the dye degradation.