Nafion-AC-based asymmetric capacitive deionization

Cai, Wenshu; Yan, Junbin; Hussin, Taimoor; Liu, Jianyun

doi:10.1016/j.electacta.2016.12.069

Cited by 57 publications

(20 citation statements)

References 52 publications

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“…Of particular interest is the increase in CNT bre specic surface area, the use of other metal oxides and development of asymmetric devices. 21,67,68 It would also be benecial to gain more insight into the role of the various interfaces in the three phase system (electrolyte, MOx, CNTs) during CDI for water purication and ion removal. From a technological point of view, the high conductivity and exibility in bending of the CNT bre fabrics opens the possibility to make current collector-free electrodes with complex non-planar shapes that simplify integration and improve device performance.…”

Section: Discussionmentioning

confidence: 99%

“…Aiming to put to test the electrodes studied above under relevant conditions for CDI, an asymmetric CDI (aCDI) 1,21,46,67,68 full ow cell was assembled and used for brackish water (2.0 g L À1 NaCl) desalination. Considering that 2.0 g L À1 NaCl is one of the highest salt concentrations studied in nanocarbon-based electrodes for CDI, 69 and that the maximum salt adsorption capacity (mg g À1 ) reaches a plateau followed by a decrease at high concentrations, 20 higher NaCl concentrations were not considered for further tests.…”

Section: à2mentioning

confidence: 99%

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Interconnected metal oxide CNT fibre hybrid networks for current collector-free asymmetric capacitive deionization

et al. 2018

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Section: Discussionmentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

Interconnected metal oxide CNT fibre hybrid networks for current collector-free asymmetric capacitive deionization

et al. 2018

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“…(7): u i : ion mobility; E: electric field intensity. From Eqs., (6) and 7, optimal frequency (f 0 ) is related to properties of ion, such as: ionic radius, valence, ion mobility, and also related to the concentration of ion.…”

Section: Frequencymentioning

confidence: 99%

“…As CDI gets more and more attention, many studies have been carried out by scholars all around the world. Most researches are about the electrode materials (carbon aerogel, carbon nanotubes, grapheme) [4][5][6][7], integration of microbial fuel cells and CDI [8,9], membrane CDI [10,11] and flow-electrode CDI [12,13].…”

Section: Introductionmentioning

confidence: 99%

Capacitive deionization using a pulsed power supply for water treatment

Jin¹,

Hu²,

Sun³

et al. 2019

Desalination and Water Treatment

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A capacitive deionization system utilizing a pulsed power supply was designed and investigated for desalination. In most studies on capacitive deionization, direct current power supply is the most common power source. Compared with traditional direct-current capacitive deionization, pulsed-capacitive deionization exhibits some excellent properties in desalination: lower power consumption, higher removal rate. The optimal operational conditions of a pulsed power supply in capacitive deionization were discussed in this study. From the experiment results, as for NO 3 of initial concentration 40 mg/L, a duty cycle of 50% and a frequency of 1000 Hz were optimal. From the theory of electrolyte solution, the optimal frequency is related to properties of ion, such as: ionic radius, valence, ion mobility, and also related to the concentration of ion. The results of molecular dynamics simulation were consistent with the experimental results. the reasons for excellent performances of pulsed-capacitive deionization in desalination may be that: the effect of concentration polarization and the migration resistance from solution to the EDL were reduced. Pulsed-capacitive deionization could be used for low concentration water desalination and it provides a new idea for the preparation of ultra pure water and the advanced treatment of wastewater.

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“…under a voltage lower than 1.2 V(Cai et al 2017. The typical energy intensity of conventional CDI is approximately 0.1-1.5 kWh/m 3 , depending on the salinity of feedwater and effluent requirement.…”

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confidence: 99%

Brackish water desalination using reverse osmosis and capacitive deionization at the water-energy nexus

et al. 2020

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In this article, we present a critical review of the reported performance of reverse osmosis (RO) and capacitive deionization (CDI) for brackish water (salinity < 5.0 g/L) desalination from the aspects of engineering, energy, economy and environment. We first illustrate the criteria and the key performance indicators to evaluate the performance of brackish water desalination. We then systematically summarize technological information of RO and CDI, focusing on the effect of key parameters on desalination performance, as well as energy-water efficiency, economic costs and environmental impacts (including carbon footprint). We provide in-depth discussion on the interconnectivity between desalination and energy, and the trade-off between kinetics and energetics for RO and CDI as critical factors for comparison. We also critique the results of technical-economic assessment for RO and CDI plants in the context of large-scale deployment, with focus on *Manuscript Click here to view linked References 2 lifetime-oriented consideration to total costs, balance between energy efficiency and clean water production, and pretreatment/post-treatment requirements. Finally, we illustrate the challenges and opportunities for future brackish water desalination, including hybridization for energy-efficient brackish water desalination, co-removal of specific components in brackish water, and sustainable brine management with innovative utilization. Our study reveals that both RO and CDI should play important roles in water reclamation and resource recovery from brackish water, especially for inland cities or rural regions.

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Nafion-AC-based asymmetric capacitive deionization

Cited by 57 publications

References 52 publications

Interconnected metal oxide CNT fibre hybrid networks for current collector-free asymmetric capacitive deionization

Interconnected metal oxide CNT fibre hybrid networks for current collector-free asymmetric capacitive deionization

Capacitive deionization using a pulsed power supply for water treatment

Brackish water desalination using reverse osmosis and capacitive deionization at the water-energy nexus

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