Herein, we proposed a method by pre-embedding organic covalent organic framework TpTt-COF(TpTt) (consisting of the electron donor 1,3,5-triazine-2,4,6-triamine (Tt) and electron acceptor 2,4,6-triformylphloroglucinol (Tp) aldehyde) within inorganic ZnFeO core to serve as seed for the in-situ grafting of organic TpTt shell tightly. The as-formed ZnFeO-seed@TpTt-COF (Z-S@TpTt) core–shell structure exhibited visible-light-driven photocatalytic degradation of BPA effectively. This may stem from the rationally tuned energy band structure of ZnFeO-seed via TpTt pre-anchoring, thus enabled a Z-scheme electron transfer way within the heterojunction to broaden the light adsorption, accelerate the charge transfer and maintain their thermodynamic redox capacity. More strikingly, humic acid (HA) in the actual wastewater (food waste leachate (FWL), where BPA highly frequently presented) could even boost the photocatalytic degradation of BPA. Comprehensive characterizations and DFT calculations revealed that HA acts as a critical “electron shuttle” to further promote the separation of electron-hole pairs via the formation of an EDA complex with the Z-S@TpTt. The gathered electrons on CB of ZnFeO-seed and holes on VB of TpTt may generate more •O and O, thus the improved performance of Z-S@TpTt core–shell heterojunction in BPA degradation was achieved. Besides the promoted catalytical activity, the convenient separation ability and extraordinary chemical/thermal stability inherited from the magnetic core and the COF shell also enabled robust reuse of Z-S@TpTt heterojunction in FWL. All of these properties endowed Z-S@TpTt heterojunction with the practical application potential to remove BPA in an economical and environment-friendly way, which is also compatible with the “waste control by waste” strategy today.

中文翻译：

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合理制备Z型异质结ZnFe2O4-seed@TpTt-COF，用于可见光驱动原始腐殖酸光催化降解食品垃圾渗滤液中双酚A

在此，我们提出了一种预嵌入有机共价有机骨架TpTt-COF(TpTt)（由电子供体1,3,5-三嗪-2,4,6-三胺（Tt）和电子受体2,4组成）的方法。 ,6-三甲酰间苯三酚 (Tp) 醛）位于无机 ZnFeO 核内，作为紧密接枝有机 TpTt 壳的种子。所形成的 ZnFeO-seed@TpTt-COF (ZS@TpTt) 核壳结构有效地表现出可见光驱动的 BPA 光催化降解作用。这可能源于通过TpTt预锚定合理调整ZnFeO种子的能带结构，从而在异质结内实现Z型电子转移方式，从而扩大光吸收，加速电荷转移并保持其热力学氧化还原能力。更引人注目的是，实际废水（食物垃圾渗滤液（FWL）中经常存在 BPA）中的腐殖酸（HA）甚至可以促进 BPA 的光催化降解。综合表征和 DFT 计算表明，HA 作为关键的“电子穿梭”，通过与 ZS@TpTt 形成 EDA 复合物，进一步促进电子-空穴对的分离。 ZnFeO-种子的CB上聚集的电子和TpTt的VB上的空穴可以产生更多的·O和O，从而提高了ZS@TpTt核壳异质结在BPA降解方面的性能。除了提高催化活性外，磁核和COF壳继承的便利分离能力和出色的化学/热稳定性也使得ZS@TpTt异质结在FWL中的稳健重复使用成为可能。所有这些特性都赋予ZS@TpTt异质结以经济环保的方式去除BPA的实际应用潜力，这也与当今“以废治废”的策略相契合。