Structural effects on the catalytic activity of carbon-supported magnetite nanocomposites in heterogeneous Fenton-like reactions.
Structural effects on the catalytic activity of carbon-supported magnetite nanocomposites in heterogeneous Fenton-like reactions.
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碳负载磁铁矿纳米复合材料在非均相类芬顿反应中的结构对催化活性的影响
DOI：
10.1039/c8ra02286k
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发表时间：
2018-04-27
期刊：
影响因子：
3.9
通讯作者：
Liu, Juan
中科院分区：
文献类型：
--
作者：
Zang, Hongmei;Miao, Chunyan;Shang, Jianying;Liu, Yingxin;Liu, Juan
比较了合成的裸磁铁矿纳米颗粒、活性炭负载磁铁矿（AC-Mt）和氧化石墨烯负载磁铁矿（GO-Mt）对亚甲基蓝（MB）的非均相类Fenton氧化的催化活性，以研究载体的结构特征如何影响纳米复合材料的催化活性。系统研究了活性炭和石墨油对亚甲基蓝去除率、羟基自由基生成、铁浸出和表面失活的不同影响。AC-Mt去除MB的速率常数为0.1161 min-1，比裸磁铁矿纳米颗粒的值（0.0566 min-1）大一个数量级。活性炭负载的磁铁矿具有较高的催化活性，这可能是由于分散性好的磁铁矿具有较大的反应比表面积，并且活性炭负载的磁铁矿表面通过Fe-O-C键进行了再填充。然而，MB的去除率由GO-Mt是一个数量级慢于裸磁铁矿纳米粒子在相同的实验条件下，可能是由于GO包裹在磁铁矿纳米粒子或GO-Mt复合材料的广泛聚集。这些研究结果揭示了载体结构对碳载磁铁矿纳米复合材料催化活性的显著影响，这对于开发高效的磁铁矿基废水处理催化剂具有重要意义。
The catalytic reactivity of synthetic bare magnetite nanoparticles, activated carbon supported magnetite (AC-Mt), and graphene oxide supported magnetite (GO-Mt) for heterogeneous Fenton-like oxidation of methylene blue (MB) were compared, in order to investigate how the structural features of the support impact catalytic activity of the nanocomposites. The different effects of AC and GO on MB removal rate, hydroxyl radical (˙OH) production, iron leaching, and surface deactivation have been systematically studied. The rate constant of MB removal by AC-Mt was 0.1161 min−1, one order of magnitude larger than the value of bare magnetite nanoparticles (0.0566 min−1). The higher catalytic activity of AC-Mt might be attributed to the larger reactive surface area of well-dispersed magnetite for ˙OH production and the recharge of the magnetite surface by the AC support via Fe–O–C bonds. However, the removal rate of MB by GO-Mt was one order of magnitude slower than that of bare magnetite nanoparticles under the same experimental conditions, presumably due to the wrapping of GO around magnetite nanoparticles or extensive aggregation of GO-Mt composites. These findings revealed the significant influence of support structure on the catalytic activity of carbon-supported magnetite nanocomposites, which is important for the development of efficient magnetite-based catalysts for wastewater treatments.
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影响因子：
13.6
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