Constructing Nano-Heterostructure with Dual-Site to Boost HO Activation and Regulate the Transformation of Free Radicals.

A major issue with Fenton-like reaction is the excessive consumption of HO caused by the sluggish regeneration rate of low-valent metal, and how to improve the activation efficiency of HO has become a key in current research. Herein, a nano-heterostructure catalyst (1.0-MnCu/C) based on nano-interface engineering is constructed by supporting Cu and MnO on carbon skeleton, and its kinetic rate for the degradation of tetracycline hydrochloride is 0.0436 min, which is 2.9 times higher than that of Cu/C system (0.0151 min). The enhancement of removal rate results from the introduced Mn species can aggregate and transfer electrons to Cu sites through the electron bridge Mn-N/O-Cu, thus preventing Cu from oxidizing HO to form O , and facilitating the reduction of Cu and generating more reactive oxygen species (O and ·OH) with stronger oxidation ability, resulting in HO utilization efficiency is 1.9 times as much as that of Cu/C. Additionally, the good and stable practical application capacity in different bodies demonstrates that it has great potential for practical environmental remediation.