Abstract Fischer-Tropsch waste water (FTW) is with complex organic compositions, and is toxic/stinking odor. So far, FTW is very difficult to be treated in industry. In this work, Fe-based bi-MOFs heterojunctions, i.e., MIL-88A(Fe)@MIL-88B(Fe) are synthesized through internal extended growth of rod-like MIL-88A on spindle-like MIL-88B. The compositions, structure and characteristics are systematically investigated. By virtue of larger surface area, rich active sites and strong interfacial coupling, this bi-MOFs catalyst establish better h+-e− separation/transfer. As expected, this bi-MOFs hybrid materials shows remarkable photo-catalytic performance toward FTW remediation by the help of ozone. The COD removal in bi-MOFs/O3 system is 4.2 times higher than that of ozonation alone. Furthermore, h+, O2− and OH are the predominant active radicals for FTW remediation. Bi-MOFs displays acceptable stability after 5 cycles. This work provides a new way for photo-catalytic ozonation and may drive the development of MOFs-based photo-catalytic ozonation for waste water treatment, not limited in FTW.

中文翻译：

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构建铁基双 MOFs 用于光催化 Fischer-Tropsch 废水中的有机污染物臭氧化

摘要 Fischer-Tropsch 废水（FTW）具有复杂的有机成分，并且具有有毒/恶臭的气味。到目前为止，FTW在工业上是很难被处理的。在这项工作中，铁基双 MOFs 异质结，即 MIL-88A(Fe)@MIL-88B(Fe) 是通过棒状 MIL-88A 在纺锤状 MIL-88B 上的内部扩展生长合成的。系统地研究了组成、结构和特性。凭借更大的表面积、丰富的活性位点和强界面耦合，这种双 MOFs 催化剂建立了更好的 h+-e- 分离/转移。正如预期的那样，这种双 MOF 杂化材料在臭氧的帮助下对 FTW 修复显示出卓越的光催化性能。bi-MOFs/O3 系统的 COD 去除率是单独臭氧化的 4.2 倍。此外，h+，O2− 和 OH 是 FTW 修复的主要活性自由基。Bi-MOFs 在 5 个循环后显示出可接受的稳定性。这项工作为光催化臭氧化提供了一种新方法，并可能推动基于 MOFs 的光催化臭氧化废水处理的发展，而不仅限于 FTW。