Title: MOF-derived Single Site Catalysts with Electron-Rich Fe-N4 sites for Efficient Elimination of Trichloroacetamide DBP

Authors: Yao-Yin Lou, Shuhu Yin, Jian Yang, Lifei Ji, Jiayi Fang, Shengqi Zhang, Mingbao Feng, Xin Yu, Yan-Xia Jiang, Shi-Gang Sun*

Abstract: Herein, Fe/Co was firstly co-doped on zeolitic imidazolate framework-8 and then calcination to form electron-rich Fe-N4 single site catalysts ( eFeNSCs). The eFeNSCs are composed of FeCo nanoparticles (∼5 nm) surrounded by Fe-N₄ active sites, giving the sites negatively charged. The electrochemical in-situ Fourier transform infrared reflection (FTIR) spectroscopy and linear sweep voltammetry analysis demonstrate that the eFeNSCs promote the adsorption of trichloroacetamide and facilitate the C-Cl bond breaking, following a concerted mechanism. Over 97% trichloroacetamide removal, 90% of dechlorination selectivity, and 37% of current efficiency were achieved on eFeNSCs within 90 min at -1.2V, which are significantly superior to Fe-N₄ single site catalysts (FeNSCs) without FeCo nanoparticle. The high dechlorination selectivity of the eFeNSCs brought in the lower genotoxicity of the treated solution, which has been firstly demonstrated by SOS/umu tests. This study provides a new strategy in designing electron-rich single sites electrocatalysts for efficient elimination of disinfection by-products.

Full-Link: https://www.sciencedirect.com/science/article/pii/S1385894722025529#!