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[ENVIRONMENTAL POLLUTION] Nano-magnetite supported by biochar pyrolyzed at different temperatures as hydrogen peroxide activator: Synthesis mechanism and the effects on ethylbenzene removal
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作者: Yan, JC (Yan, Jingchun) ; Yang, L (Yang, Lei); Qian, LB (Qian, Linbo) ; Han, L (Han, Lu); Chen, MF (Chen, Mengfang)

 

题目:Nano-magnetite supported by biochar pyrolyzed at different temperatures as hydrogen peroxide activator: Synthesis mechanism and the effects on ethylbenzene removal

 

刊物:ENVIRONMENTAL POLLUTION,卷: 261    文献号: 114020

DOI: 10.1016/j.envpol.2020.114020

出版年: JUN 2020

 

下载链接:https://www.sciencedirect.com/science/article/pii/S0269749119354624?via%3Dihub

 

摘要: 

Nano-magnetite supported by biochar (nFe(3)O(4)/BC) pyrolyzed at temperatures of 300 degrees C-600 degrees C was developed to activate hydrogen peroxide (H2O2) for the efficient degradation of ethylbenzene in aqueous solution. It was revealed that the degradation efficiency of ethylbenzene and TOC removal were 96.9% and 36.2% respectively after the reaction for 40 min in the presence of initial concentration of 0.1 mmol L-1 ethylbenzene, 2.76 g L-1 nFe(3)O(4)/BC500 with the mass ratio of nFe(3)O(4) to BC500 of 4:1 and 2.0 mmol L-1 H2O2 at pH 7.0. Based on electron paramagnetic resonance (EPR), quenching experiment and X-ray photoelectron spectroscopy (XPS) data, both center dot OH and O-2(center dot-) radicals were generated in the nFe(3)O(4)/BC500 activated H2O2 system, and the center dot OH radicals were the predominant species for the degradation of ethylbenzene. Through electron transfer process, mechanisms of Fe(II), phenolic hydroxyl group and persistent free radicals (PERs) on BC surfaces accounted for the generation of center dot OH radicals, and Fe(III) in nFe(3)O(4) and formed from Fe(II) oxidation responsible for the generation of O-2(center dot-) radicals in the nFe(3)O(4)/BC activated H2O2 system were proposed. (C) 2020 Elsevier Ltd. All rights reserved.

 

 

 

 

 

 

 

 

 


 

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