催化作用
生物炭
纳米颗粒
电子转移
降级(电信)
化学
化学工程
多孔性
纳米-
蚀刻(微加工)
腐植酸
电化学
热解
光化学
材料科学
纳米技术
物理化学
电极
有机化学
工程类
图层(电子)
电信
计算机科学
肥料
作者
Zhuoqian Li,Kai Li,Shuanglong Ma,Bingjun Dang,Yang Li,Haichao Fu,Jinge Du,Qiang Meng
标识
DOI:10.1016/j.jcis.2020.08.049
摘要
A convenient and efficient method to fabricate isolated Fe single-atom catalysts deposited on Myriophyllum aquaticum-based biochar (ISA-Fe/MC) is reported for peroxymonosulfate-based organics degradation. Firstly, the Fe nanoparticles anchored on the hierarchical porous biochar (nano-Fe/MC) can be obtained by utilizing K2FeO4 as a synchronous activation and graphitization agent. Subsequently, ISA-Fe/MC was achieved by HCl etching of nano-Fe/MC to remove the excess Fe nanoparticles. Compared with nano-Fe/MC, ISA-Fe/MC demonstrated outperformed catalytic capacity towards PMS activation for phenol degradation. The combination of super high surface area, hierarchical porous structure, graphitization structure and atomically dispersed Fe species should be responsible for prominent catalytic oxidation ability and outstanding resistance to common anions and humic acid. Based on the chemical scavengers, EPR experiments and electrochemistry tests, the SO4•- dominated radical degradation pathway for nano-Fe/MC and electron transfer reigned non-radical degradation pathway for ISA-Fe/MC was revealed. In contrast to nano-Fe/MC, density functional theory calculations demonstrated the enhanced density of states around Fermi level in ISA-Fe/MC meaning the increased catalytic performance and more electron transfer between single-atom Fe to adjacent graphitic C and N which could serve as electron transfer channel for PMS activation.
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