催化作用
纳米片
化学
电子转移
吸附
双金属片
双锰矿
氧化物
污染物
降级(电信)
协同催化
无机化学
比表面积
化学工程
反应速率常数
氧化石墨
动力学
光化学
氧化锰
有机化学
电信
计算机科学
工程类
物理
量子力学
作者
Xiuying Liu,Jiao Zhou,Qianna Xia,Bowen Li,Qiaohui Gao,Shuaiqi Zhao,Aimal Khan,Aihua Xu,Xiaoxia Li
标识
DOI:10.1016/j.jhazmat.2022.130178
摘要
The development of efficient and eco-friendly Mn-based hybrids for the degradation of biorefractory organic pollutants via peroxymonosulfate (PMS) activation is highly desired. In this study, a novel graphite nanosheet (GNs)-based Fe-Mn bimetallic oxide (Fe doped birnessite MnO2, FeMn/GNs) was synthesized under mild conditions. Compared with monometallic Fe or Mn oxide on GNs, FeMn/GNs exhibited a higher surface area, decreased Mn oxidation states, stronger interaction with GNs, and more active sites for PMS adsorption. Among different Fe/Mn ratios, Fe2Mn1/GNs showed the optimum performance for bisphenol A (BPA) degradation with the first-order rate constant of 0.22 min-1, which was about 8.5 and 12.9 times higher than that of Mn/GNs and Fe/GNs, respectively. Different from the pollutant-catalyst-PMS electron transfer mechanism for Mn/GNs, the direct two-electron transfer in FeMn/GNs+PMS system, was mainly processed between the simultaneously activated BPA and PMS. This was probably based on the double adsorption sites of Fe and Mn species on the same catalyst: PMS was adsorbed by Fe species through hydroxyl groups, while BPA was mainly coordinated with Mn species due to the layered structure and hydrophobicity of the Mn oxide. This study is expected to provide the rational design of efficient Mn-based hybrids for PMS activation.
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