Filter‐membrane treatment of continuous‐flow tetracycline through photocatalysis‐assisted peroxydisulfate oxidation

Abstract Herein, we craft a high‐performance advanced oxidation process (AOP) of photocatalysis‐coupled peroxydisulfate (PDS) system toward practical applications in organic wastewater treatment. CoFe 2 O 4 nanoparticles well grow onto TiO 2 nanotube arrays (TNAs) mesh (CoFe 2 O 4 /TNAs). The artful CoFe 2 O 4 /TNAs composite plays a bifunctional role in the proposed AOP. On one hand, CoFe 2 O 4 /TNAs itself is a visible‐light‐response photocatalyst. On the other hand, the Co(II) or Fe(II) in CoFe 2 O 4 can heterogeneously activate PDS to generate energetic active species ( • OH, SO 4 ˙ – , O 2 ˙ – , and 1 O 2 ). Meanwhile, the photo‐induced electrons can be also captured by electron traps Co(III) (or Fe(III)) which are further reduced to Co(II) (or Fe(II)) for continuous activation of PDS. As a result, the robust AOP of photocatalysis‐coupled PDS can almost completely degrade 10 mg/L refractory tetracycline within 40 min. Moreover, the proposed process shows a stable continuous‐flow treatment performance. This work provides basic understanding and support for continuous‐flow treatment of organic wastewater by photocatalysis‐coupled PDS system.