Selective reduction of Cu2+ with simultaneous degradation of tetracycline by the dual channels ion imprinted POPD-CoFe2O4 heterojunction photocatalyst

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2019-03, Vol.360, p.750-761
• Main Authors: He, Fan, Lu, Ziyang, Song, Minshan, Liu, Xinlin, Tang, Hua, Huo, Pengwei, Fan, Weiqiang, Dong, Hongjun, Wu, Xiangyang, Han, Song
• Format: Article
• Language: English
• Subjects: Dual channels; Ion imprinting technique; POPD-CoFe2O4 heterojunction photocatalyst; Selective Cu2+ reduction; Simultaneous tetracycline degradation
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2018.12.034

Magnetic ion imprinted heterojunction photocatalyst realize selective reduction of Cu2+ and simultaneous degradation of tetracycline based on the imprinted cavity and mesoporous dual channels. [Display omitted] •The as-prepared photocatalyst is obtained by microwave-assisted ion imprinting technique.•The existence of the Cu2+ imprinted cavities in the imprinted layer improves the selectivity.•Tetracycline contact with CoFe2O4 via mesoporous in the imprinted layer and further be degraded.•Heterojunction formed between CoFe2O4 and POPD greatly improves the photocatalytic activity.•Dual channels realize selective reduction of Cu2+ and simultaneous degradation of tetracycline. The dual channels ion imprinted POPD-CoFe2O4 heterojunction photocatalyst (magnetic ion imprinted heterojunction photocatalyst) was synthesized by utilizing the microwave-assisted ion imprinting technique. The as-prepared photocatalyst can selectively reduce Cu2+ owing to abundant Cu2+ imprinted cavities existed in the imprinted layer and Cu2+ was rapidly reduced by e− in POPD, the ions selectivity coefficient (kions) of Cu2+ to other ions over magnetic ion imprinted heterojunction photocatalyst was 11.495 (kions (Cu2+/Cd2+)), 4.716 (kions (Cu2+/Fe3+)) and 15.910 (kions (Cu2+/Zn2+)), respectively, and the materials selectivity coefficient (kmaterials) of magnetic ion imprinted heterojunction photocatalyst relative to other materials was 4.998, 2.545, 10.474 and 4.918, respectively, both showed excellent selectivity. Furthermore, with the existence of mesoporous in the imprinted layer, tetracycline can easily contact with CoFe2O4 and further be degraded by h+ in CoFe2O4. Consequently, selective reduction of Cu2+ and simultaneous degradation of tetracycline can be realized via the dual channels of imprinted cavity and mesoporous. More importantly, the heterojunction structure formed between CoFe2O4 and POPD effectively separated e− and h+, which greatly promoted the photocatalytic activity of selective reduction of Cu2+ and simultaneous degradation of tetracycline. With an enhanced stability for recyling, this work provided a high-efficient and economic technical approach for selective reduction of specific heavy metal ions and simultaneous degradation of organic contaminant in complex water environment.