标题: The removal of azo dye from aqueous solution by oxidation with peroxydisulfate in the presence of granular activated carbon: Performance, mechanism and reusability

作者: Li, J (Li, Jing); Zhu, KM (Zhu, Kangmeng); Li, RM (Li, Ruimeng); Fan, XH (Fan, Xiaohui); Lin, H (Lin, Heng); Zhang, H (Zhang, Hui)

来源出版物: CHEMOSPHERE 卷: 259 文献号: 127400 DOI: 10.1016/j.chemosphere.2020.127400 出版年: NOV 2020

摘要: Granular activated carbon (GAC) was used as catalyst for the activation of peroxydisulfate (PDS) to decolorize and degrade Acid Orange 7 (AO7) in water. EPR spectra and radical quencher experiments were employed to identify the active species for AO7 oxidation in the PDS/GAC system. Linear sweep voltammetry (LSV) and chronoamperometry test were carried out to identify the contribution of nonradical mechanism for AO7 decay. The investigation of crucial operational parameters on the decolorization indicated 100 mg/L AO7 can be almost totally decolorized in a broad range of pH. Common inorganic anions adversely affect the AO7 decolorization process and the inhibition was in the order of: HCO3- > H2PO4- > SO42- > Cl- > NO3-. UVevis spectra showed the destruction of the aromatic moiety of AO7 molecule during the oxidation reaction of the PDS/GAC system. The transformation of nitrogen related to the azo bond in AO7 molecule in this system was observed by monitoring the released N-containing inorganic ions. Recycle experiments showed GAC cannot be reused directly but its catalytic ability can be restored by using electrochemical method. (C) 2020 Elsevier Ltd. All rights reserved.

入藏号: WOS:000566573600024

PubMed ID: 32593002

语言: English

文献类型: Article

作者关键词: Granular activated carbon; Peroxydisulfate; Reactive radical; Nonradical mechanism; Azo dye

地址: [Li, Jing; Zhu, Kangmeng; Li, Ruimeng; Fan, Xiaohui; Lin, Heng; Zhang, Hui] Wuhan Univ, Dept Environm Sci & Engn, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430079, 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, Peoples R China.

电子邮件地址: lheng2015@whu.edu.cn; eeng@whu.edu.cn

影响因子：5.778