FeNi3 foam as cathode catalyst in electrocatalytic peroxydisulfate system for enhanced Hg0 removal from simulated flue gas

Zhang, Qianqian; Zhang, Anchao; Li, Hao; Zhang, Xinmin; Sun, Zhijun; Mei, Yanyang; Xiang, Jun; Xiang, Jun; Tan, Zengqiang; Lü, Hao

doi:10.1016/j.jece.2023.109384

Cited by 5 publications

(9 citation statements)

References 47 publications

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“…By contrast, Figure b demonstrates the effect of SO 2 injection on Hg 0 removal activity. Once 180 ppm SO 2 gas was introduced into the reaction solution, Hg 0 removal efficiency quickly declined from 92 to 82% after 30 min of reaction, which was ascribed to the consumption of reactive radicals according to eqs –. , As SO 2 was removed, Hg 0 removal efficiency nearly returned to its original value. A similar result was also obtained when the experiment was repeated.…”

Section: Resultsmentioning

confidence: 99%

“…The schematic diagram of the experimental device can be found in the Supporting Information (Figure S1) . The flue gas simulation system comprised 12% CO 2 , 6% O 2 , balanced N 2 carrying around 50 μg/m 3 of Hg 0 , NO, and SO 2 (when employed) with a total gas flow rate of 1.3 L/min.…”

Section: Methodsmentioning

confidence: 99%

“…S1). 28 The flue gas simulation system comprised 12% CO 2 , 6% O 2 , balanced N 2 carrying around 50 μg/m 3 of Hg 0 , NO, and SO 2 (when employed) with a total gas flow rate of 1.3 L/min. A Pt sheet and a Fe foam were employed as the anode and the cathode, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al adopted a Fe foam as the electrode to degrade perfluorooctanoic acid (PFOA) from wastewater, demonstrating that 87.5% of PFOA was degraded under optimal conditions . The Fe foam catalyst, owing to its reasonably low price, is regarded as an appropriate candidate because it could electroactivate PDS with in-situ-generated reactive reagents Fe 2+ /Fe 3+ on the surface of the electrode to generate SO 4 •– . ,− Until now, the study of EA PDS using the Fe foam for Hg 0 removal has rarely been performed.…”

Section: Introductionmentioning

confidence: 99%

“…consumption of • OH by CO3 2− in the EA reaction process 28,37. Nevertheless, both Na 2 SO 4 and NaNO 3 electrolytes could remove more than 95% of Hg 0 in the Fe foam/EA/PDS system, suggesting that Na 2 SO 4 and NaNO 3 possess superior conductivity than other electrolytes.…”

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confidence: 99%

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Fe Foam/Electroactivated Peroxydisulfate: A Highly Efficient Method to Remove Elemental Mercury

Zhang

Song

et al. 2023

Energy Fuels

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The removal of elemental mercury (Hg0) from simulated flue gas using the method of Fe foam/electroactivated peroxydisulfate (EA PDS) was carried out in an electrocatalytic reactor. Various factors including the voltage level, PDS concentration, temperature, electrolyte, initial pH, NO, and SO2 were considered to obtain optimized experimental parameters. It was found that approximately 95% of Hg0 was removed under optimal conditions: a voltage of 3 V, 2 mM of PDS, a reaction temperature of 20 °C, and pH = 7. NO would enhance the EA performance, while SO2 slightly inhibited the Hg0 removal activity. In addition, the stability of the Fe foam electrode was confirmed by a long-term experiment and indicated that the Fe foam electrode is efficient. The electrical energy consumption in the Fe foam/EA PDS system for Hg0 oxidation was estimated to be low. Meanwhile, scanning electron microscopy, energy-dispersive spectrometry, and X-ray diffraction obviously revealed the consumption of Fe foam and the production of Fe3O4. Scavenger experiments identified that SO4 •– and •OH were the main reactive radicals. Based on characterizations and experiments, the pathway and mechanism for enhanced Hg0 removal were proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Fe Foam/Electroactivated Peroxydisulfate: A Highly Efficient Method to Remove Elemental Mercury

Zhang

Song

et al. 2023

Energy Fuels

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Acid treatment for enhancing Hg0 removal efficiency of chlorine-loaded biochar: mechanism and kinetic analysis

Zhang,

Wang,

Yang

et al. 2023

Environ Sci Pollut Res

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Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

Le,

Wang,

Zeng

et al. 2023

Energy Fuels

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Coal-fired power plants are a significant source of mercury pollution, necessitating the development of inexpensive and efficient adsorbents for mercury removal. This work proposes the preparation of an adsorbent using acid-chlorine-modified rice straw coke for this purpose. The characterization of the adsorbent shows that the modification increases the surface pore structure and makes the surface carry abundant oxygen-containing functional groups, which is conducive to improving the mercury removal capacity of the adsorbent. This work studies the effects of the acid–chlorine ratio, mass ratio, inlet mercury concentration, and reaction temperature on the desorption performance of modified rice straw coke and investigates the mechanism of mercury removal by combining the kinetic model and density functional theory. The results demonstrate that the optimal effect of the combined acid–chlorine modification is achieved at an acid–chlorine ratio and mass ratio of 1:2. The reaction temperature has a significant effect on the efficiency of mercury removal, and the increase of the inlet mercury concentration can promote mercury removal. The mercury adsorption process is primarily controlled by surface mass transfer and chemisorption, with chemisorption being the critical control step. The introduction of Cl and O atoms through modification creates doped structures that are highly conducive to mercury adsorption. The Cl atom exhibits greater reactivity toward the Hg atom, facilitating the removal of mercury. The presence of O atoms not only increases the abundance of oxygen-containing functional groups on the surface, but also enhances the activity of the Cl atoms. These findings provide valuable theoretical support for the application of biomass coke in the field of mercury removal, addressing mercury pollution associated with coal-fired power plants.

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FeNi3 foam as cathode catalyst in electrocatalytic peroxydisulfate system for enhanced Hg0 removal from simulated flue gas

Cited by 5 publications

References 47 publications

Fe Foam/Electroactivated Peroxydisulfate: A Highly Efficient Method to Remove Elemental Mercury

Fe Foam/Electroactivated Peroxydisulfate: A Highly Efficient Method to Remove Elemental Mercury

Acid treatment for enhancing Hg0 removal efficiency of chlorine-loaded biochar: mechanism and kinetic analysis

Multiscale Understanding of the Mechanism of Mercury Removal by Acid–Chlorine-Modified Biomass Coke: Experiments and Simulations

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