双金属片
催化作用
浸出(土壤学)
纳米复合材料
多相催化
化学
化学工程
亚甲蓝
材料科学
零价铁
无机化学
纳米技术
光催化
吸附
物理化学
有机化学
工程类
环境科学
土壤科学
土壤水分
作者
Liangqian Fan,Xianda Wang,Jiaxin Miao,Jie Cai,Fenghui Chen,Wei Chen,Huibo Luo,Lin Cheng,Xiaochan An,Xiaoxiao Zhang,Ke Zhang,Dandan Ma
标识
DOI:10.1016/j.molliq.2023.122069
摘要
Zero-valent iron (Fe0) is a promising catalyst for the heterogeneous electro-Fenton (EF) process. However, for practical application of Fe0, there are some problems such as the Fe2+/Fe3+ cycle is not fast enough, the leaching stability is poor, and F0 is easy to be oxidized. Herein, to overcome the defects, core–shell structured Fe0/Mn0@Fe/Mn oxides bimetallic nanocomposites (C-nZVIM) were developed, which were used as novel heterogeneous EF catalysts for treating MB-containing wastewater to explore their catalytic effect and mechanism. Results indicated that the suitable Mn/Fe mass ratio for the preparation of C-nZVIM was 3:1. C-nZVIM had a core–shell structure with an Fe0/Mn0 core surrounded by an Fe/Mn oxides shell. C-nZVIM could be applied to the heterogeneous EF process over a wide range of initial pH (2.5–8) with high MB removal efficiencies (96.75 %–81.97 %). Mn doped in C-nZVIM promoted the Fe2+/Fe3+ cycle and enhanced •OH generation. Considerable MB mineralization (62.3 % at 150 min and 71.2 % at 300 min) was gained due to •OH. The application of C-nZVIM in the heterogeneous EF process for MB removal achieved a low total leaching of Fe and Mn and desirable catalytic effect. This work offered a novel efficient and stable catalyst for the heterogeneous EF process and provided accurate guidance for its application.
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