CNT/copper hexacyanoferrate: A superior Faradic electrode for ammonium ion removal with stable performance and high capacity

Wang, Shiyong; Pan, Zhihao; Li, Zhuo; Zhuang, Haohong; Zhao, Lin; Li, Zhuolin; Lei, Yuhao; Wang, Gang

doi:10.1016/j.cej.2023.143163

Cited by 10 publications

(7 citation statements)

References 66 publications

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“…Figures S10 and S11 show a reduction in the area of characteristic peaks of Fe(III) and Cu(II) with an increase in the area of Fe(II) and Cu(I) peaks after the insertion of Cu(II), indicating the reduction of most Fe(III) to Fe(II) and partly Cu(II) to Cu(I). 31,39 These results clearly indicated that both Fe and Cu in the CuFe PBA electrode are electroactive, serving as redoxactive centers during the ion confinement progress. 40,41 Extended X-ray absorption fine structure (EXAFS) analysis was conducted to investigate the local environmental changes around transition metal ions in the CuFe PBA electrode during the ion confinement progress.…”

Section: Design Mechanism Verification For Our Ionmentioning

confidence: 80%

“…The crystal structure of CuFe PBA (Figure 2a) is characterized by a stable coordination polymer framework with extensive channels, facilitating rapid and reversible insertion/extraction of various metal ions. 31,32 Previous studies have shown that CuFe PBA has excellent ion insertion capabilities, especially Cu(II) (Figure 2b). 33,34 To delve into the Cu(II) confinement possibility within CuFe PBA, we calculated the Gibbs free energies for Cu(II) insertion.…”

Section: Design Principle and Mechanism Verification Formentioning

confidence: 93%

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Solar-Driven Ion Confinement for Synergetic Pollutants Remediation and Valuable Metal Recovery in Wastewater

Dang,

Wang,

Sun

et al. 2024

ACS EST Eng.

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With the increasing demand for sustainable and resource-efficient wastewater treatment technologies, particularly in addressing metal−organic complexes contamination, herein we present a photoelectrochemical (PEC) wastewater treatment system based on a solar-driven ion confinement strategy. Employing a coordination polymer framework known as copper hexacyanoferrate (CuFe Prussian blue analogues (PBA)) as the host material for ion confinement, our strategy creates a pathway that couples photogenerated electrons with heavy-metal ions. This facilitates rapid electron transfer, enabling the effective separation of charge carriers and simultaneous capture of Cu(II) from wastewater. Taking Cu-ethylenediaminetetraacetic acid (EDTA) as a model pollutant, our proposed method demonstrates a removal efficiency of 92.2% for Cu-EDTA complexes and a recovery rate of 76.5% for Cu(II) under unbiased conditions. Analysis using X-ray absorption fine structure (XAFS) confirms the ion confinement of Cu(II) within the structure, distinguishing it from traditional PEC methods that focus on obtaining elemental Cu(0). Controlled release of metal ions not only meets specific requirements but also has significant potential for chemical recovery. Our proposed technology embodies the concept of utilizing pollutants to treat pollutants, making full use of concomitant heavy-metal ions in wastewater. It concurrently achieves the efficient degradation of organic pollutants while also facilitating resource recovery.

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Section: Design Mechanism Verification For Our Ionmentioning

confidence: 80%

Section: Design Principle and Mechanism Verification Formentioning

confidence: 93%

Solar-Driven Ion Confinement for Synergetic Pollutants Remediation and Valuable Metal Recovery in Wastewater

Dang,

Wang,

Sun

et al. 2024

ACS EST Eng.

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“…Two major peaks of Fe 2p ( Figure 4 e) were detected at 711.2 and 724.6 eV, attributed to the Fe 2p 3/2 and Fe 2p 1/2 peaks of Fe 2 O 3 , respectively [ 36 ]. Additionally, a satellite peak at 719.5 eV showed the existence of Fe 3+ [ 37 ]. The element compositions (atomic %) of different samples determined with XPS are listed in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

Fe2O3 Embedded in N-Doped Porous Carbon Derived from Hemin Loaded on Active Carbon for Supercapacitors

Yang,

Luo,

Wang

et al. 2023

Molecules

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The high power density and long cyclic stability of N-doped carbon make it an attractive material for supercapacitor electrodes. Nevertheless, its low energy density limits its practical application. To solve the above issues, Fe2O3 embedded in N-doped porous carbon (Fe2O3/N-PC) was designed by pyrolyzing Hemin/activated carbon (Hemin/AC) composites. A porous structure allows rapid diffusion of electrons and ions during charge–discharge due to its large surface area and conductive channels. The redox reactions of Fe2O3 particles and N heteroatoms contribute to pseudocapacitance, which greatly enhances the supercapacitive performance. Fe2O3/N-PC showed a superior capacitance of 290.3 F g−1 at 1 A g−1 with 93.1% capacity retention after 10,000 charge–discharge cycles. Eventually, a high energy density of 37.6 Wh kg−1 at a power density of 1.6 kW kg−1 could be delivered with a solid symmetric device.

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“…doping, but these methods often involve complex synthesis steps. [21][22][23][24][25][26] On the other hand, it has been found that the electrochemical properties of PBA are closely related to its intrinsic crystal structure. Due to the rapid growth of crystals during the preparation process, a large number of Fe(CN) 6 vacancies and heterogeneous molecules (e.g., interstitial water) are usually generated in the PBA framework, which will decrease host sites for Na + , retard electron/ion transport, and impair the crystal periodicity, making the framework easy to collapse.…”

Section: Introductionmentioning

confidence: 99%

Structural distortion-induced monoclinic sodium iron hexacyanoferrate as a high-performance electrode for rocking-chair desalination batteries

Wu,

Huang,

et al. 2024

Nanoscale

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CNT/copper hexacyanoferrate: A superior Faradic electrode for ammonium ion removal with stable performance and high capacity

Cited by 10 publications

References 66 publications

Solar-Driven Ion Confinement for Synergetic Pollutants Remediation and Valuable Metal Recovery in Wastewater

Solar-Driven Ion Confinement for Synergetic Pollutants Remediation and Valuable Metal Recovery in Wastewater

Fe2O3 Embedded in N-Doped Porous Carbon Derived from Hemin Loaded on Active Carbon for Supercapacitors

Structural distortion-induced monoclinic sodium iron hexacyanoferrate as a high-performance electrode for rocking-chair desalination batteries

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