Magnetic recyclable CoFeO@PPy prepared by Fenton oxidization polymerization with advanced photo-Fenton performance.

Here we present a magnetic recyclable photo-Fenton catalyst CoFeO@PPy with uniform morphology and excellent dispersibility prepared simple Fenton oxidization polymerization. The CoFeO core provides good magnetic recyclability for the catalysts as well as the ion source for catalyzed decomposition of HO in PPy coating. The optimal catalytic effect can be obtained by adjusting the ratio of CoFeO and PPy. Methylene blue, Methyl orange and Rhodamine B (RhB) employed as model pollutants certificated that the catalyst exhibits a wide range of photodegradability. The decoloration rates reach nearly 100% in the photodegradation of 10 mg L RhB after 2 h visible-light irradiation and only low toxicity small molecules are detected by LC-MS. Moreover, the catalytic activity remains after 5 cycles with decoloration rates up to 90%. The degradation measurement in the presence of scavengers of reactive species reveals that the positive holes (h) and hydroxyl radical (·OH) are the main reactive oxygen species in the CoFeO@PPy system. The performance enhancement may be attributed to the combination of improved Fenton activity by coordinated Fe and PPy redox pairs and photo-catalytic activity by broaden adsorption and photo-generated charge separation.