Carbon nanotubes/activated carbon hybrid as a high-performance suspension electrode for the electrochemical desalination of wastewater

Chen, Kuan‐Yu; Shen, Yu-Yi; Wang, Da-Ming; Hou, Chia‐Hung

doi:10.1016/j.desal.2021.115440

Cited by 29 publications

(8 citation statements)

References 56 publications

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“…Variation of (a) current and (b) SAC with deionization time, (c) the relationship between SAC and specific capacitance, (d) the CE and ASAR results of different flow electrodes, (e) the relationship between CE and ASAR for materials from this work and the literature, ,,− (f) the cycling stability tests of AC/PANI-2 in FCDI.…”

Section: Resultsmentioning

confidence: 91%

Regulating Surface Wettability and Charge Density of Porous Carbon Particles by In Situ Growth of Polyaniline for Constructing an Efficient Electrical Percolation Network in Flow-Electrode Capacitive Deionization

Xiong

Zhu

et al. 2022

Langmuir

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Both electrical conductivity and surface wettability are required for the selection of active carbon materials in flow-electrode capacitive deionization, while a trade-off exists between these two properties. In this work, a hybrid material with a thin layer of polyaniline (PANI) coating on activated carbon (AC/PANI) was successfully developed to retain excellent electrical conductivity and acquire good surface wettability. By adjusting the dosage of initiator, AC/PANI composites with different loading fractions of PANI were obtained. The electrochemical testing demonstrated that the AC/PANI composites have higher specific capacitance and lower ion diffusion resistance compared to pure AC, resulting in better desalinization performance. Specifically, with a feed concentration of 1600 mg/L, excellent adsorption capacity and high charge efficiency can be simultaneously achieved at 13.51 mg/g and 92.21%, respectively. Benefiting from the formation of a continuous electrical percolation network and reduced solid/liquid interfacial transport resistance, a 39% enhancement of average salt adsorption rate (from 0.54 to 0.75 μmol/min/cm2) was obtained.

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Section: Resultsmentioning

confidence: 91%

Regulating Surface Wettability and Charge Density of Porous Carbon Particles by In Situ Growth of Polyaniline for Constructing an Efficient Electrical Percolation Network in Flow-Electrode Capacitive Deionization

Xiong

Zhu

et al. 2022

Langmuir

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“…A higher voltage generally causes higher energy consumption. During the CV CDI research conducted by Chen et al [ 46 ], the energy consumption and charge efficiency increased simultaneously when the voltage increased. Halabaso et al [ 47 ] used manganese-vanadate-decorated reduced graphene oxide as electrodes in a symmetric CDI cell, the energy consumption of which increased by nearly 3 times as the applied voltage increased from 0.8 to 1.4 V, indicating the drastic impact of the electric field intensity on the energy consumption of CDI.…”

Section: The Impacts Of the Electrical Field And Feed Solution Proper...mentioning

confidence: 99%

Energy Consumption in Capacitive Deionization for Desalination: A Review

Jiang

Jin

Wei

et al. 2022

IJERPH

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Capacitive deionization (CDI) is an emerging eco-friendly desalination technology with mild operation conditions. However, the energy consumption of CDI has not yet been comprehensively summarized, which is closely related to the economic cost. Hence, this study aims to review the energy consumption performances and mechanisms in the literature of CDI, and to reveal a future direction for optimizing the consumed energy. The energy consumption of CDI could be influenced by a variety of internal and external factors. Ion-exchange membrane incorporation, flow-by configuration, constant current charging mode, lower electric field intensity and flowrate, electrode material with a semi-selective surface or high wettability, and redox electrolyte are the preferred elements for low energy consumption. In addition, the consumed energy in CDI could be reduced to be even lower by energy regeneration. By combining the favorable factors, the optimization of energy consumption (down to 0.0089 Wh·gNaCl−1) could be achieved. As redox flow desalination has the benefits of a high energy efficiency and long lifespan (~20,000 cycles), together with the incorporation of energy recovery (over 80%), a robust future tendency of energy-efficient CDI desalination is expected.

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“…Capacitive deionization (CDI), with its advantages of high desalination efficiency, low environmental footprint, and low energy consumption, is considered as a prospective solution to the challenge of freshwater shortage through desalination of saline water. − In general, the desalination performance of a CDI system deeply depends on the electrochemistry performance of the electrode materials. , Up to now, carbon materials (such as active carbon, graphene, , and porous carbon , ) and some pseudocapacitive materials (such as transition metal oxides , and Prussian blue analogues − ) have been extensively studied to use as electrode materials. However, the low adsorption capacity and sluggish desalination rate have seriously restricted their practical application. , Therefore, developing high-performance electrode materials to enhance deionization of the CDI system remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Vertically Aligned Bismuthene Nanosheets on MXene for High-Performance Capacitive Deionization

et al. 2023

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Capacitive deionization has been considered as a promising solution to the challenge of freshwater shortage due to its high efficiency, low environmental footprint, and low energy consumption. However, developing advanced electrode materials to improve capacitive deionization performance remains a challenge. Herein, the hierarchical bismuthene nanosheets (Bi-ene NSs)@MXene heterostructure was successfully prepared by combining the Lewis acidic molten salt etching and the galvanic replacement reaction, which achieves the effective utilization of the molten salt etching byproducts (residual copper). The vertically aligned bismuthene nanosheets array evenly in situ grown on the surface of MXene, which not only facilitate ion and electron transport as well as offer abundant active sites but also provide strong interfacial interaction between bismuthene and MXene. Benefiting from the above advantages, the Bi-ene NSs@MXene heterostructure as a promising capacitive deionization electrode material exhibits high desalination capacity (88.2 mg/g at 1.2 V), fast desalination rate, and good long-term cycling performance. Moreover, the mechanisms involved were elaborated by systematical characterizations and density functional theory calculations. This work provides inspirations for the preparation of MXene-based heterostructures and their application for capacitive deionization.

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Carbon nanotubes/activated carbon hybrid as a high-performance suspension electrode for the electrochemical desalination of wastewater

Cited by 29 publications

References 56 publications

Regulating Surface Wettability and Charge Density of Porous Carbon Particles by In Situ Growth of Polyaniline for Constructing an Efficient Electrical Percolation Network in Flow-Electrode Capacitive Deionization

Regulating Surface Wettability and Charge Density of Porous Carbon Particles by In Situ Growth of Polyaniline for Constructing an Efficient Electrical Percolation Network in Flow-Electrode Capacitive Deionization

Energy Consumption in Capacitive Deionization for Desalination: A Review

Vertically Aligned Bismuthene Nanosheets on MXene for High-Performance Capacitive Deionization

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