Selective reduction of Cu2+ with simultaneous degradation of tetracycline by the dual channels ion imprinted POPD-CoFe2O4 heterojunction photocatalyst
Selective reduction of Cu2+ with simultaneous degradation of tetracycline by the dual channels ion imprinted POPD-CoFe2O4 heterojunction photocatalyst
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双通道离子印迹POPD-CoFe2O4异质结光催化剂选择性还原Cu2并同时降解四环素
DOI：
10.1016/j.cej.2018.12.034
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发表时间：
2019-03-15
影响因子：
15.1
通讯作者：
Han, Song
中科院分区：
文献类型：
--
作者：
He, Fan;Lu, Ziyang;Han, Song
利用微波辅助离子印迹技术合成了双通道离子印迹POPD-CoFe 2 O 4异质结光催化剂（磁性离子印迹异质结光催化剂）。由于印迹层中存在丰富的Cu 2+印迹空穴，所制备的磁性离子印迹异质结光催化剂对Cu 2+具有选择性还原作用，且在POPD中Cu 2+被e-迅速还原，Cu 2+对其它离子的选择性系数（k（ions））为11.495（k（ions）（2+2+）（（Cu/Cd），磁性离子印迹异质结光催化剂的材料选择性系数（k（materials））分别为4.998、2.545、10.474和4.918，均表现出良好的选择性。此外，由于印迹层中介孔的存在，四环素很容易与CoFe 2 O 4接触，并被CoFe 2 O 4中的H（+）降解。因此，通过印迹孔和介孔的双重通道，可以实现对Cu 2+的选择性还原和对四环素的同时降解。更重要的是，CoFe 2 O 4与POPD之间形成的异质结结构有效地分离了e（-）和h（+），极大地促进了选择性还原Cu 2+同时降解四环素的光催化活性。本研究为复杂水环境中特定重金属离子的选择性还原和有机污染物的同步降解提供了一条高效、经济的技术途径。
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 asprepared 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 (k(ions)) of Cu2+ to other ions over magnetic ion imprinted heterojunction photocatalyst was 11.495 (k(ions) (2+2+)((Cu/Cd))), 4.716 (k(ions) (3+)((Cu/Fe)) and 15.910 (k(ions) (2+2+)((Cu/Zn)), respectively, and the materials selectivity coefficient (k(materials)) 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.