Despite widespread deployment and investigation of ultrafiltration (UF) for secondary effluent purification, the challenge of membrane fouling due to effluent organic matter (EfOM) remains formidable. This study introduced a novel pretreatment method utilizing Co nanoparticles-encapsulated carbon nanotubes activated peroxymonosulfate (Co@CNT/PMS) to degrade EfOM and mitigate membrane fouling. Characterization of Co@CNT revealed the efficient encapsulation of Co nanoparticles within nanotubes, which notably enhanced the catalytic degradation of bisphenol A and typical organics. The tube-encapsulated structure increased the concentration of reactive species within the confined nanoscopic space, thereby improving the probability of collisions with pollutants and promoting their degradation. The Co@CNT/PMS pretreatment led to substantial reductions in aromatic compounds, fluorescent components, and both high and middle molecular weight substances. These changes proved crucial in diminishing the fouling potential in subsequent UF processes, where reversible and irreversible fouling resistances decreased by 97.1 % and 72.8 %, respectively. The transition volume from pore blocking to cake filtration markedly increased, prolonging the formation of a dense fouling layer. Surface properties analysis indicated a significant reduction of pollutants on membrane surfaces after the Co@CNT/PMS pretreatment. This study underscored the efficacy of confinement-based advanced oxidization pretreatment in enhancing UF performance, presenting a viable resolution to membrane fouling.

中文翻译：

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使用 Co 纳米颗粒封装的碳纳米管进行纳米限制催化，以增强二次污水处理中的过氧一硫酸盐氧化：改善水质和缓解膜污染


尽管超滤 （UF） 在二次流出物净化中得到了广泛部署和研究，但流出物有机物 （EfOM） 造成的膜污染挑战仍然令人生畏。本研究介绍了一种新的预处理方法，利用 Co 纳米颗粒封装的碳纳米管活化过氧一硫酸盐 （Co@CNT/PMS） 降解 EfOM 并减轻膜污染。Co@CNT 的表征揭示了 Co 纳米颗粒在纳米管内的有效封装，这显着增强了双酚 A 和典型有机物的催化降解。管封装结构增加了受限纳米空间内反应性物质的浓度，从而提高了与污染物碰撞的可能性并促进了它们的降解。Co@CNT/PMS 预处理导致芳香族化合物、荧光成分以及高分子量和中分子量物质的大幅减少。事实证明，这些变化对于减少后续超滤工艺中的结垢可能性至关重要，其中可逆和不可逆的抗结垢性分别降低了 97.1% 和 72.8%。从孔隙堵塞到滤饼过滤的过渡体积显著增加，延长了致密污垢层的形成。表面性质分析表明，Co@CNT/PMS 预处理后膜表面的污染物显著减少。本研究强调了基于约束的先进氧化预处理在提高超滤性能方面的功效，为膜污染提供了可行的解决方案。