文献类型：期刊文献

英文题名：Fe3O4/graphene aerogels: A stable and efficient persulfate activator for the rapid degradation of malachite green

作者：Lu, Jian[1];Zhou, Yi[1];Lei, Juying[1,2];Ao, Zhimin[3];Zhou, Yanbo[1,2]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, Natl Engn Lab Ind Wastewater Treatment, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Guangdong Univ Technol, Sch Environm Sci & Engn, Inst Environm Hlth & Pollut Control, Guangdong Key Lab Environm Catalysis & Hlth Risk, Guangzhou 510006, Peoples R China

年份：2020

卷号：251

外文期刊名：CHEMOSPHERE

收录：;EI(收录号：20201008271725);WOS:【SCI-EXPANDED(收录号:WOS:000533642900053)】；

基金：This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB0602601), the National Natural Science Foundation of China (Grant No. 51778230), Shanghai Rising-Star Program (Grant No. 17QA1401000), the Fundamental Research Funds for the Central Universities (Grant No. 222201718003), China Postdoctoral Science Foundation (2018M641943), and Shanghai Sailing Program (19YF1411900).

语种：英文

外文关键词：Dye; Persulfate; Fenton-like; Fe3O4; Graphene

摘要：Encapsulation metal oxides into carbon frameworks is a good strategy to synthesis high activity and stable catalyst. Here, Fe3O4 nanoparticles (similar to 20 nm) were firmly encapsulated in the graphene aerogels by a simple and environmentally friendly method (Fe3O4/GAs), for activating persulfate (PS) to degrade malachite green (MG) under simulated sunlight. A strong electron conduction was generated between the Fe3O4 nanoparticles and graphene sheets to improve the cycle of Fe(II)/Fe(III), and the MG degradation over a wide pH rage (3-9) was enhanced greatly. The MG molecule was decomposed into 12 intermediates and two possible pathways was proposed. More importantly, toxicity test and Toxicity Estimation Software (T.E.S.T.) proved that the toxicity of MG can be effectively controlled by Fe3O4/GAs + PS + light system. In addition to the high catalytic activity, Fe3O4/GAs exhibited a good stability and reusability due to the strong interaction between Fe3O4 and graphene layers. The degradation efficiency remained above 87% after six cycles, and the leaching amount of iron in each cycle was less than 0.125 wt%. SO4 center dot(-) was the dominate radical for MG degradation and the heterogeneous Fenton-like reaction was mainly performed on the surface of catalyst. This work lay a foundation for applying Fe3O4/GAs as a highly efficient, stable and reusable heterogeneous Fenton-like catalyst for future applications. (C) 2020 Elsevier Ltd. All rights reserved.