Efficient oxidative dissolution of V2O3 by the in situ electro-generated reactive oxygen species on N-doped carbon felt electrodes. (1st February 2017)

• Record Type: Journal Article
• Authors: Xue, Yudong; Wang, Yunting; Zheng, Shili; Sun, Zhi; Zhang, Yi; Jin, Wei
• Is Part Of: Electrochimica acta. Volume 226(2017)
• Page Start: 140
• Page End: 147
• Publication Date: 2017-02-01
• Subjects: Reactive oxygen species -- Vanadium dissolution -- Hydroxyl radical -- Alkaline media -- Electro-Fenton-like; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.01.001
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: Novel alkaline electro-Fenton-like was applied for V2 O3 oxidative dissolution. N-doped carbon felt electrode was fabricated for the two-electron ORR. ROS including ·OH and HO2 − was in-situ generated from the electrochemical system. A significant enhancement of V2 O3 dissolution was achieved due to the ROS. Abstract: Oxidative dissolution is a critical step for the efficient remediation of heavy metal oxides in large-scale solid wastes. In the present study, a novel electro-oxidative dissolution process of V2 O3 to VO4 3− is achieved by the in-situ generated reactive oxygen species on the N-doped carbon felt cathode in alkaline media. The electro-catalytic HO2 − generation and hydrophilic behavior were significantly enhanced by the introduction of nitrogen-containing functional groups. Besides, the mechanism of electrochemical vanadium conversion is systematically illustrated, and a vanadium self-induced electro-Fenton-like reaction is proposed. By employing the radical quenching and ESR measurements, the contributions for V(III) dissolution is determined to be 43.5% by HO2 − and 56.5% by hydroxyl radicals, respectively. It should be noted that the V2 O3 solid particles can be efficiently dissolved via adsorption-reaction scheme on the carbon felt electrode. This novel electrochemical strategy provides a promising solution for the heavy metal oxide treatment and further understanding for the in situ reactive oxygen species.