标题: Heterogeneous Electro-Fenton system for efficient degradation of 2,4-DCP: Dual activation of O-2 for H2O2 generation and oxygen-defect cobalt ferrite catalysts
作者: Wang, ZC (Wang, Zhicheng); Pi, L (Pi, Liu); Cui, JX (Cui, Jiaxin); Zhang, XN (Zhang, Xiaona); Liu, YX (Liu, Yuxiao); Tang, DD (Tang, Dingding); Zhu, H (Zhu, Hua); Mao, XH (Mao, Xuhui)
来源出版物: SEPARATION AND PURIFICATION TECHNOLOGY 卷: 255 文献号: 117731 DOI: 10.1016/j.seppur.2020.117731 出版年: JAN 15 2021
摘要: In this study, an innovative heterogeneous Electro-Fenton system (R-FPE system) was designed for degrading bio-refractory 2,4-dichlomphenol (2,4-DCP). Fe rod and polymer-carbon composite (PCC) electrodes were employed as anode and cathode, respectively; and sodium disilicate (SD) solution as electrolyte could coordinate with the electrogenerated ferrous iron (Fe(II)). Dual activation of O-2 at near-neutral pH, i.e., both the electrochemical and chemical activation, accounted for the on-site generation of H2O2. As the heterogeneous catalyst, the reduced CoFe2O4 (R-CoFe2O4) displayed an excellent H2O2 decomposition activity, because it had larger surface area, smaller particle size and more surface oxygen defects than pristine CoFe2O4 (P-CoFe2O4). The radical scavenging and electron paramagnetic resonance tests revealed that hydroxyl radicals were the dominant species to destroy 2,4-DCP. The optimal parameters for 2,4-DCP degradation were 10 mM SD at pH 7.5, 10 mA electrical current, and 0.4 g/L R-CoFe2O4. The magnetism of R-CoFe2O4 enabled a magnetic separation process for its recovery, and a followed CaO-coagulation stage could effectively remove the remaining dissolved ferric iron in the reaction solution. According to this study, a process consisting of the oxidation in R-FPE system, the magnetic separation of R-CoFe2O4 catalyst and the CaO-coagulation is prospectively proposed for treating intractable organic wastewater.
作者关键词: Electro-Fenton; Activation of O-2; Silicate; Hydroperoxide; CoFe2O4
地址: [Wang, Zhicheng; Pi, Liu; Cui, Jiaxin; Zhang, Xiaona; Tang, Dingding; Zhu, Hua; Mao, Xuhui] Wuhan Univ, Hubei Int Sci & Technol Cooperat Base Sustainable, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
[Wang, Zhicheng; Mao, Xuhui] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.
[Liu, Yuxiao] Hebei Delong Environm Engn Co, Baoding 071000, Peoples R China.
通讯作者地址: Mao, XH (通讯作者)，Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430072, Peoples R China.
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