Filter‐membrane treatment of continuous‐flow tetracycline through photocatalysis‐assisted peroxydisulfate oxidation
Zuoyan Zhu, Haifang Tang, Yi Du, Yuanfeng Wei, Yuqing Chen, Weijian Yang, Danyu Zhang, Ziru Li, Chengbin Liu
Abstract
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.