Performance and mechanism of arsenic removal in waste acid by combination of CuSO4 and zero-valent iron

Xi, Yunhao; Zou, Jingtian; Luo, Yongguang; Li, Jing; Li, Xiteng; Liao, Tianqi; Zhang, Libo; Wang, Chen; Lin, Guiping

doi:10.1016/j.cej.2019.121928

Cited by 38 publications

(7 citation statements)

References 47 publications

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“…Due to the higher corrosion potential of Cu as compared to Fe, Cu acted as the cathode of the Cu-Fe corrosion cell. [20] According to our proposed general mechanism, LDH will precipitate on the cathode of a corrosion cell forming a self-supported LDH. In this experiment, NiFe-LDH nanosheets were indeed observed on the Cu foam cathode (Figure S20a, Supporting Information).…”

Section: Growth Mechanism Of Nife-ldh@ifmentioning

confidence: 99%

NiFe Layered Double Hydroxides Grown on a Corrosion‐Cell Cathode for Oxygen Evolution Electrocatalysis

Zhao

Hong

Luan

et al. 2021

Advanced Energy Materials

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electricity. Electrochemical water splitting includes oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Compared with HER, OER is more sluggish owing to the multiple electrons transfer and is thus mainly responsible for the high overpotential of electrochemical water splitting. [1b] To reduce the overpotential, electrocatalysts are required to accelerate the OER.Among the developed non-noble-metalbased electrocatalysts for OER. [2] Layered double hydroxides (LDH) are attractive due to their high electrocatalytic activity. [1b,3] Compared with powdery LDH, self-supported LDH is more desirable due to the simplified electrode preparation and the intimate contact with current collectors. [4] Hydrothermal, [5] electrodeposition, [6] and corrosion engineering [7] methods have been adopted to prepare self-supported LDH. Among these methods, corrosion engineering is more promising due to the absence of intentional energy input, mild reaction conditions, simple instruments, and high scalability. [8] By adjusting the substrate and corrosion solution, various self-supported LDH can be obtained via corrosion engineering. Self-supported NiCo-LDH, [9] NiCoRu-LDH, [9b] and NiFe-LDH [10] were prepared by the corrosion of nickel foam in CoCl 2 , CoCl 2 &RuCl 3 , and FeCl 2 or Fe(NO 3 ) 3 solution, respectively. Other than the nickel foam, iron foam and nickel-iron foam were also used to prepare different self-supported LDH among which the NiFe-LDH on iron foam (NiFe-LDH@IF) exhibited the best electrocatalytic performance toward OER. [11] For example, Liu reported that the NiFe-LDH@IF required only 340 mV to reach 1000 mA cm -2 where it remained stable for more than 6000 h. [7a] This is the best reported electrocatalytic stability so far. [8] However, the further optimization of the growth and electrocatalytic performance of the NiFe-LDH@IF is hindered by some fundamental issues. Based on previous reports, the growth mechanism of the NiFe-LDH@IF remains controvers ial, [7a,8,11c,12] and the growth process is still unclear. Moreover, the effects of corrosion conditions on the growth and electrocatalytic performance of the NiFe-LDH@IF are not fully understood.To address these issues, we systematically characterized the NiFe-LDH@IF prepared under different corrosion conditions. Based on these results, we elucidate the growth mechanism For sustainable hydrogen production, electrochemical water splitting is a promising method whose efficiency is limited by its anodic reaction, i.e., the oxygen evolution reaction (OER). One of the best electrocatalysts for the OER is the self-supported nickel-iron layered double hydroxides on iron foam (NiFe-LDH@IF) prepared by corrosion engineering. However, the further development of NiFe-LDH@IF is hampered by a lack of understanding regarding the growth mechanism and the effects of corrosion conditions on the electrocatalytic activity. Herein, the growth mechanism is studied, revealing for the first time that NiFe-LDH@IF is formed by the preferential precipitation of Ni...

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Section: Growth Mechanism Of Nife-ldh@ifmentioning

confidence: 99%

NiFe Layered Double Hydroxides Grown on a Corrosion‐Cell Cathode for Oxygen Evolution Electrocatalysis

Zhao

Hong

Luan

et al. 2021

Advanced Energy Materials

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“…The reduction in As(V) removal was attributed to the formation of abundant copper species on the S-nZVI@ZSM-5 surface, which prevented the corrosion of Fe 0 and the appearance of Fe 2+ . 61 On the other hand, the excessive Cu(OH) 2 can react with As(V) species to produce copper arsenate precipitate on the S-nZVI@ZSM-5 surface, suggesting a high removal percentage (> 85%) of As(V) under alkaline conditions.…”

Section: Wileyonlinelibrarycom/jctbmentioning

confidence: 99%

Enhancing arsenic removal from acidic wastewater using zeolite‐supported sulfide nanoscale zero‐valent iron: the role of sulfur and copper

Zhou

Han

Min

et al. 2021

J of Chemical Tech & Biotech

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“…141) In another study, addition of CuSO 4 to IP, enhanced the corrosion rate of IP due to formation of Fe-Cu galvanic system, thus improving rate of arsenic removal. 144) In another study, Sun and team treated IP with acid (HCl) to improve its performance of arsenic removal. 126) Reported results reveal that, acid treated IP showcased similar reactivity as of nano ZVI but at a comparatively lower cost of usage.…”

Section: Evolution Of Arsenic Removal Using Iron Powdersmentioning

confidence: 99%

Iron Powders as a Potential Material for Arsenic Removal in Aqueous Systems

et al. 2021

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Performance and mechanism of arsenic removal in waste acid by combination of CuSO4 and zero-valent iron

Cited by 38 publications

References 47 publications

NiFe Layered Double Hydroxides Grown on a Corrosion‐Cell Cathode for Oxygen Evolution Electrocatalysis

NiFe Layered Double Hydroxides Grown on a Corrosion‐Cell Cathode for Oxygen Evolution Electrocatalysis

Enhancing arsenic removal from acidic wastewater using zeolite‐supported sulfide nanoscale zero‐valent iron: the role of sulfur and copper

Iron Powders as a Potential Material for Arsenic Removal in Aqueous Systems

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