Magnetic recyclable CoFe 2 O 4 @PPy prepared by in situ Fenton oxidization polymerization with advanced photo-Fenton performance.

Here we present a magnetic recyclable photo-Fenton catalyst CoFe 2 O 4 @PPy with uniform morphology and excellent dispersibility prepared via simple in situ Fenton oxidization polymerization. The CoFe 2 O 4 core provides good magnetic recyclability for the catalysts as well as the ion source for catalyzed decomposition of H 2 O 2 in PPy coating. The optimal catalytic effect can be obtained by adjusting the ratio of CoFe 2 O 4 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 -1 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 CoFe 2 O 4 @PPy system. The performance enhancement may be attributed to the combination of improved Fenton activity by coordinated Fe 2+ and PPy redox pairs and photo-catalytic activity by broaden adsorption and photo-generated charge separation.