标题: Wood-based biochar as an excellent activator of peroxydisulfate for Acid Orange 7 decolorization
作者: Zhu, KM (Zhu, Kangmeng); Wang, XS (Wang, Xisong); Chen, D (Chen, Dong); Ren, W (Ren, Wei); Lin, H (Lin, Heng); Zhang, H (Zhang, Hui)
来源出版物: CHEMOSPHERE 卷: 231 页: 32-40 DOI: 10.1016/j.chemosphere.2019.05.087 出版年: SEP 2019
摘要: Wood-based biochar, as a metal-free heterogeneous activator of peroxydisulfate (PDS), was successfully prepared by pyrolysis of polar sawdust for efficient removal of Acid Orange 7 (AO7). The results demonstrate PDS could be effectively activated by wood-based biochar, and AO7 was rapidly eliminated in a wide range of pH value (3.0-10.0) with AO7 removal achieved >= 99.3% after 14 min reaction. The dominant reactive species in the biochar/PDS system were verified via radical quenching tests and electron paramagnetic resonance (EPR) technique. It is speculated that sulfate radicals (SO4 center dot-) and hydroxyl radicals ((OH)-O-center dot) were formed on the surface of biochar. Based on the results of X-ray photoelectron spectroscopy (XPS), pi-electron density and oxygen-containing functional groups (especially C-OH) on biochar surface were active centers for the catalytic reaction. Recycle experiments of biochar for 4 runs were carried out and the regeneration method of the catalyst was also studied. (C) 2019 Elsevier Ltd. All rights reserved.
作者关键词: Wood-based biochar; Acid Orange 7; Peroxydisulfate activation; Reactive species
地址: [Zhu, Kangmeng; Wang, Xisong; Chen, Dong; Ren, Wei; Lin, Heng; Zhang, Hui] Wuhan Univ, Dept Environm Sci & Engn, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Hubei, Peoples R China.
通讯作者地址: Lin, H; Zhang, H (通讯作者)，Wuhan Univ, Dept Environm Sci & Engn, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, Hubei, Peoples R China.
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