Insights on the role of interparticle porosity and electrode thickness on capacitive deionization performance for desalination

Barcelos, Kamilla M.; Oliveira, Kaíque S.G.C.; Ruotolo, Luís A.M.

doi:10.1016/j.desal.2020.114594

Cited by 24 publications

(12 citation statements)

References 52 publications

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“…In general, micropores determined the adsorption capacity, and the reduction of micropores was expected to lower the adsorption property. 40 However, the surface coated PANI is likely to switch the hydrophobic carbon surface to be hydrophilic and thus accelerate the diffusion of ions in the pore channels. In addition, the conjugated backbone structure of PANI had higher charge density than AC, 34 which would change the ion−surface interaction at the solid−liquid interface and thus affect the ion adsorption behavior.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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: ■ Results and Discussionmentioning

confidence: 99%

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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“…However, polydopamine modification of ion exchange membranes showed decrement in electrosorption performance, which was attributed to inhibition of ion transportation without changing the hydrophilicity. In another study, the electrode preparation techniques were compared with respect to electrosorption performance (Barcelos et al, 2020). Two different techniques, blade-casting (DB) and free-standing (FS) were used to prepare the electrodes, which affected the thickness, interparticle porosity and hydrophilicity of the electrodes as shown in Figure 41a.…”

Section: Factors Affecting Electrosorption Performancementioning

confidence: 99%

“…

normalS goodbreak= \frac{{SRE}_{normali}}{{SRE}_{normalj}}

ρ goodbreak= \frac{\frac{c_{i, in} - c_{i, f}}{c_{i, italicin}}}{\frac{c_{j, in} - c_{j, f}}{c_{j, italicin}}}

S_{i / j} goodbreak= \frac{\int_{0}^{t} ()(, c_{i, italicinf} goodbreak- c_{i, italiceff}) italicdt / c_{i, italicinf}}{\int_{0}^{t} ()(, c_{j, italicinf} goodbreak- c_{j, italiceff}) italicdt / c_{j, italicinf}}

The coulombic efficiency (CoE) is calculated in flow‐electrode capacitive deionization (FCDI) architecture and is represented in Equation () (Srimuk, Su, et al, 2020).

italicCoE goodbreak= \frac{Q_{italicdischarge}}{Q_{italiccharge}}

The energy consumption (E cons ) is calculated by Equation () (Barcelos et al, 2020).

E_{cons} goodbreak= \frac{E_{cell} \int I . italicdt}{m_{italicrem}}

…”

Section: Electrosorption Performance Metricsmentioning

confidence: 99%

“…(a) SEM images of casting‐supported electrode (DB) and free‐standing electrode (FS); (b) schematic representation of CDI experimentation; (c) variation in NaCl concentration with time using different electrode materials. Reprinted from, Barcelos et al (2020), copyright (2020), with permission from Elsevier…”

Section: Factors Affecting Electrosorption Performancementioning

confidence: 99%

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Recent progress in materials and architectures for capacitive deionization: A comprehensive review

Datar

Mane

Jha

2022

Water Environment Research

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Capacitive deionization is an emerging and rapidly developing electrochemical technique for water desalination across the globe with exponential growth in publications. There are various architectures and materials being explored to obtain utmost electrosorption performance. The symmetric architectures consist of the same material on both electrodes, while asymmetric architectures have electrodes loaded with different materials. Asymmetric architectures possess higher electrosorption performance as compared with that of symmetric architectures owing to the inclusion of either faradaic materials, redox‐active electrolytes, or ion specific pre‐intercalation material. With the materials perspective, faradaic materials have higher electrosorption performance than carbon‐based materials owing to the occurrence of faradaic reactions for electrosorption. Moreover, the architecture and material may be tailored in order to obtain desired selectivity of the target component and heavy metal present in feed water. In this review, we describe recent developments in architectures and materials for capacitive deionization and summarize the characteristics and salt removal performances. Further, we discuss recently reported architectures and materials for the removal of heavy metals and radioactive materials. The factors that affect the electrosorption performance including the synthesis procedure for electrode materials, incorporation of additives, operational modes, and organic foulants are further illustrated. This review concludes with several perspectives to provide directions for further development in the subject of capacitive deionization. Practitioner Points Capacitive deionization (CDI) is a rapidly developing electrochemical water desalination technique with exponential growth in publications. Faradaic materials have higher salt removal capacity (SAC) because of reversible redox reactions or ion‐intercalation processes. Combination of CDI with other techniques exhibits improved selectivity and removal of heavy metals. Operational parameters and materials properties affect SAC. In future, comprehensive experimentation is needed to have better understanding of the performance of CDI architectures and materials.

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“…In fact, the SAC V is oen more valuable for CDI application than simply pursuing gravimetric desalination capacity (SAC G ). 1,[16][17][18] Therefore, it is imperative to reasonably design the structure and morphology of carbon electrode materials to enhance their SAC V .…”

Section: Introductionmentioning

confidence: 99%

An ion-accumulating effect in a hollow carbon bowl electrode: understanding the structure-enhanced volumetric desalination capacity and ion transport kinetics in capacitive deionization

Zang

Wang

et al. 2022

J. Mater. Chem. A

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Insights on the role of interparticle porosity and electrode thickness on capacitive deionization performance for desalination

Cited by 24 publications

References 52 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

Recent progress in materials and architectures for capacitive deionization: A comprehensive review

An ion-accumulating effect in a hollow carbon bowl electrode: understanding the structure-enhanced volumetric desalination capacity and ion transport kinetics in capacitive deionization

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