BiOBr-based nanocomposite photocatalysts are used for removing the organic pollutants, but their poor adsorption/photocatalytic performances and the low potential for recycling limit their application. To solve the issue, herein we report a large-area recyclable CFC/BiOBr/ZIF-67 filter-membrane-shaped photocatalyst prepared by in situ growth of BiOBr/ZIF-67 nanocomposites on carbon fiber cloth (CFC). Fabrication process is based on hydrothermal synthesis of BiOBr nanosheets (diameter 0.5–1 μm) on carbon fiber cloth (as substrate material) and then a chemical bath route is used to grow ZIF-67 nanoparticles (diameter 300–600 nm) in situ on the surface of CFC/BiOBr. Resulted composite, CFC/BiOBr/ZIF-67, exhibits a high specific surface area (545.82 m² g⁻¹) and a wide photoabsorption, accompanied by an absorption edge (~ 620 nm). In dark condition, CFC/BiOBr/ZIF-67 adsorbs bisphenol A (BPA) and orange 7 (AO7) within 60 min, respectively with 20.0% and 40.1% efficiency. This level of efficiencies are correspondingly 2.6 and 3.2 times more that of the bare CFC/BiOBr (7.6% for BPA and 12.4% for AO7). Under visible light irradiation, CFC/BiOBr/ZIF-67 can degrade 69.7% of BPA and 96.0% of AO7, in 120 min, which are, respectively, 1.3 and 1.8 times higher than the absorption efficiency of bare CFC/BiOBr (53.2% for BPA, 52.0% for AO7). When CFC/BiOBr/ZIF-67 is used as a filter membrane for photocatalytic removal of pollutants in flowing wastewater (AO7, rate: ~ 1.5 L h⁻¹), 92.2% of AO7 can be decomposed after 10 filtering cycles. This study suggests CFC/BiOBr/ZIF-67 as a novel highly functional, recyclable and environmental friendly photo-driven membrane filter for purification and recovery of flowing surface waste waters.

Graphical abstract

中文翻译：

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BiOBr/ZIF-67纳米复合材料在碳纤维布上的生长作为滤膜状光催化剂用于降解流动废水中的污染物

BiOBr基纳米复合光催化剂用于去除有机污染物，但其较差的吸附/光催化性能和低回收潜力限制了它​​们的应用。为了解决这个问题，我们报告了一种大面积可回收的 CFC/BiOBr/ZIF-67 滤膜状光催化剂，该催化剂是通过在碳纤维布 (CFC) 上原位生长 BiOBr/ZIF-67 纳米复合材料制备的。制造过程基于在碳纤维布（作为基底材料）上水热合成 BiOBr 纳米片（直径 0.5-1 μm），然后使用化学浴法在原位生长 ZIF-67 纳米粒子（直径 300-600 nm ） CFC/BiOBr 的表面。所得复合材料 CFC/BiOBr/ZIF-67 具有高比表面积 (545.82 m ²  g^-1 ) 和宽光吸收，伴随着吸收边 (~ 620 nm)。在黑暗条件下，CFC/BiOBr/ZIF-67 在 60 分钟内吸附双酚 A (BPA) 和橙色 7 (AO7)，效率分别为 20.0% 和 40.1%。这一效率水平是裸 CFC/BiOBr 的 2.6 倍和 3.2 倍（BPA 为 7.6%，AO7 为 12.4%）。在可见光照射下，CFC/BiOBr/ZIF-67可在120 min内降解69.7%的BPA和96.0%的AO7，分别是裸CFC/BiOBr的吸收效率（53.2%）的1.3倍和1.8倍。 BPA，AO7 为 52.0%）。当 CFC/BiOBr/ZIF-67 用作滤膜用于光催化去除流动废水中的污染物时（AO7，速率：~ 1.5 L h ^-1), 92.2% 的 AO7 可在 10 个过滤循环后分解。该研究表明 CFC/BiOBr/ZIF-67 作为一种新型的高功能、可回收和环保的光驱动膜过滤器，用于净化和回收流动的地表废水。

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