FeNi3 foam as cathode catalyst in electrocatalytic peroxydisulfate system for enhanced Hg0 removal from simulated flue gas. Issue 2 (April 2023)

• Record Type: Journal Article
• Authors: Zhang, Qianqian; Zhang, Anchao; Li, Hao; Zhang, Xinmin; Sun, Zhijun; Mei, Yanyang; Xiang, Jun; Su, Sheng; Tan, Zengqiang; Lu, Hao
• Is Part Of: Journal of environmental chemical engineering. Volume 11:Issue 2(2023)
• Publication Date: 2023-04
• Subjects: Elemental mercury removal -- Peroxydisulfate -- Electrocatalysis -- FeNi3 foam; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2023.109384
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: The feasibility of elemental mercury (Hg 0 ) removal from simulated flue gas in electrocatalytic peroxydisulfate (PDS) system employing FeNi3 foam as cathode catalyst was studied for the first time. The electrocatalytic (EC) performance of FeNi3 foam activating PDS process was evaluated to remove Hg 0 using Pt anode, FeNi3 cathode, and Na2 SO4 electrolyte at room temperature. The results showed that the FeNi3 foam/PDS/EC system was superior to the other removal processes. According to the influence of experimental parameters, it was found that about 94% of Hg 0 was removed within 20 min under the conditions of voltage = 2 V, PDS = 1 mM, Na2 SO4 = 0.05 M. Theoretical calculations showed that the Ni atom of the FeNi3 cluster would improve its reactivity. The chemical adsorption and hybridization between PDS and FeNi3 had contributed to an efficient production of SO4 − free radical. The high removal efficiency of Hg 0 was due to the following assistances: (i) the O2 gas adsorbed on the FeNi3 foam cathode surface was able to generate radicals O2 – and OH by single electron reduction reaction, (ii) FeNi3 foam catalyst could afford Fe(II) and Ni(II) ions via two electron transfer, activating PDS to produce SO4 −, and (iii) the copresence of Fe and Ni was useful to accelerate the ion cycles of Fe(III)/Fe(II) and Ni(II)/Ni(I), which played a crucial role in FeNi3 foam/PDS/EC system. The novel proposed FeNi3 foam cathode electro-catalyzing PDS system provided a promising prospect in the pollutant control field of Hg 0 removal. Graphical Abstract: ga1 Highlights: Hg 0 was removed efficiently using electrocatalytic peroxydisulfate system. The Ni atom in the FeNi3 cluster would enhance electrocatalytic activity. FeNi3 can activate peroxydisulfate easily with the assistance of electrons. Reactive OH and SO4 − played crucial roles in the electrocatalytic process.