Perylene diimide/iron phthalocyanine Z-scheme heterojunction with strong interfacial charge transfer through π-π interaction: Efficient photocatalytic degradation of tetracycline hydrochloride.
Perylene diimide/iron phthalocyanine Z-scheme heterojunction with strong interfacial charge transfer through π-π interaction: Efficient photocatalytic degradation of tetracycline hydrochloride.
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DOI：
10.1016/j.chemosphere.2023.138617
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发表时间：
2023-04
期刊：
影响因子：
8.8
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中科院分区：
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开发具有匹配能带结构、高效电子转移和优异光催化性能的全有机Z型异质结光催化剂对可持续发展具有重要价值。采用自组装方法制备了一种新型的具有强π-π相互作用的二萘嵌苯二酰亚胺/酞菁铁（PDI/FePc）异质结，该异质结在可见光驱动下对盐酸四环素（TC）具有较强的光催化降解活性。PDI/FePc对TC的去除率分别是PDI和FePc的3倍和87.5倍。PDI/FePc（131.1 mv·dec−1）的Taffel斜率低于PDI（228.6 mv·dec−1）。这可能是由于PDI和FePc之间的强π-π相互作用，这可以减小超分子结构的层间距，并促进光生载流子在内建电场中的分离和转移。此外，自由基猝灭试验表明，超氧自由基（·O2−）在光催化氧化中起主导作用。Fe Pc修饰的PDI比表面积的增加也为电荷转移提供了快速途径，提高了吸附能力。这为形成异质结提高有机超分子材料的光催化活性提供了新的思路。
The development of an all-organic Z-scheme heterojunction photocatalyst with the matched band structure, efficient electron transfer and excellent photocatalytic performance is valuable for a sustainable future. A novel perylene diimide/phthalocyanine iron (PDI/FePc) heterojunctions with strong π-π interaction were synthesized by a self-assembled method, which exhibited strong visible-light-driven photocatalytic degradation activities of tetracycline hydrochloride (TC). The TC removal rate over PDI/FePc was achieved three times and 87.5 times higher than that of PDI and FePc. PDI/FePc (131.1 mv·dec−1) presented a lower Taffel slope than that of PDI (228.6 mv·dec−1) for the oxidation. This may be due to the strong π-π interactions between PDI and FePc, which can reduce the layer spacing of the supramolecular structure and facilitate the separation and transfer of photogenerated carriers in the built-in electric field. In addition, radical quenching tests revealed that superoxide radicals (•O2−) acted as a dominant role in photocatalytic oxidation. An increscent specific surface area of PDI decorated by FePc also gave the rapid pathway for charge transfer and enhanced the adsorption ability. This provides a new idea for the formation of heterojunction to improve the photocatalytic activity of organic supramolecular materials.