Donor-Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations Towards Tetracyclines.

Abstract

Photocatalysis is an efficient and green technology in the environmental protection. Due to the high charge separation and transfer, donor-acceptor (D-A) conjugated polymers attract much attention for their photocatalytic degradations towards organic pollutants. Herein, we reported three novel D-A conjugated polymers, named as HPBP, HPTP and HPF, with heptazine moieties as electron acceptors, while biphenyl, terphenyl or fluorene moieties as electron donors, respectively, which indeed exhibit a highly efficient photocatalytic degradation towards tetracyclines upon the visible-light irradiation. Among them, the photocatalytic performance of HPF is especially noticeable with the degradation rate up to 87% within 30 minutes, almost 11 times in comparison to those of pristine g-C3 N4 , which is mainly attributed to its high crystallinity and conjugation. For their photocatalytic mechanism, the •O2 - radical anions are regarded as the active species. This article is protected by copyright. All rights reserved.