Insight into the Fe–Ni/biochar composite supported three-dimensional electro-Fenton removal of electronic industry wastewater. (1st January 2023)

• Record Type: Journal Article
• Authors: Guo, Fang; Lou, Yaoyin; Yan, Qun; Xiong, Jianglei; Luo, Jiahao; Shen, Chikang; Vayenas, Dimitris V.
• Is Part Of: Journal of environmental management. Volume 325:Part B(2023)
• Publication Date: 2023-01-01
• Subjects: Three-dimensional electro-Fenton -- Ni–Fe/biochar composite -- Particle electrode -- Electronic industry wastewater -- MEHP -- Degradative pathway; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2022.116466
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: For the efficient removal of the bio-refractory organic pollutants in the electronic industry wastewater, the Ni–Fe (oxides) modified three-dimension (3D) particle electrode was applied in electro-Fenton system (3D/EF), where iron ions were released from anode and deposited onto algal biochar (ABC) to prepare composite catalyst during reaction process. Firstly, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) analysis were applied to confirm successful fabrication of the 3D particle electrode materials. Secondly, COD removal efficiency could reach about 80%, which was about 20% higher than that in 2D/EF system, under the optimized conditions as 2.0 g/L of Ni-ABC particle electrodes, initial pH of 3, 100 mL/min of aeration intensity and 20 mA/cm 2 of applied current density. Thirdly, characterized using three-dimensional fluorescence spectroscopy and GC-MS analysis, it seemed that most of the macromolecular substances could be degraded, whereas mono-2-ethylhexyl phthalate (MEHP) was identified as the most abundant and representative compound. Finally, possible degradation pathway of MEHP in 3D/EF system was proposed including dealkylation, cleavage of C–O bond, and demethylation. Therefore, this study provides a new strategy in designing EF system employing bimetal doped biochar composite for an efficient elimination of organic pollutants within electronic industry wastewater. Highlights: Ni–Fe modified three-dimension (3D) particle electrodes was applied in electro-Fenton (EF) system. Fe 2+ released from anode was self-deposited onto algal biochar to prepare bimetal composite catalyst. Under optimal conditions, the maximum COD removal reached about 80% within 60 min. Degradative pathway of mono-2-ethylhexyl phthalate during the 3D/EF process was proposed.