Bisthiourea immobilized UiO-66-NH supported FeO nanoparticles to accelerate dual centers Fenton-like reaction.

In this paper, an efficient catalyst UiO-66-BTU/FeO was synthesized by using bisthiourea modified zirconium-based metal organic framework (Zr-MOF). The UiO-66-BTU/FeO system features outstanding Fenton-like activity that is 22.84 times and 12.91 times larger than FeO and conventional UiO-66-NH/FeO system. It also exhibits good stability, broad pH range and recycle ability. Through comprehensive mechanistic investigations, we have ascribed the excellent catalytic performance of the UiO-66-BTU/FeO system to O and HO as the reactive intermediates, cause Zr centers can make complexation with Fe to form dual centers. Meanwhile, the CS on the bisthiourea can form Fe-S-C bonds with FeO, reducing the redox potential of Fe(III)/Fe(II) and influencing the decomposing of HO, which indirectly regulate the interaction between Fe and Zr to accelerate electron transfer during the reaction. This work exhibits the design and understanding of the iron oxides incorporated in modified MOFs with excellent Fenton-like catalytic performance to remove phenoxy acid herbicides.