Capacitive deionized hybrid systems for wastewater treatment and desalination: A review on synergistic effects, mechanisms and challenges

Dahiya, Sumit; Singh, Aakansha; Mishra, Brijesh Kumar

doi:10.1016/j.cej.2020.128129

Cited by 49 publications

(8 citation statements)

References 126 publications

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“…Based on the above excellent electroadsorption performance, the advantages of the MCDI module using MPC-3 and MPD-3 as asymmetrical electrodes can be concluded by the following aspects (1) The three-dimensionally connected CNF skeleton not only accommodates more accessible electrolyte ions but also shortens the ion diffusion path, which can improve the ion storage capacity of the electrodes. (2) The hybridization of Ti 3 C 2 T x can synergistically improve the electrical conductivity and mechanical stability of the electrodes. (3) The homogeneously deposited PPy layer is favorable for fast electrochemical kinetics, which allows fast electron transfer between the MCNF skeleton and the PPy layer for reduced charge transfer resistance.…”

Section: Electrochemical Analysismentioning

confidence: 99%

“…Global conflict caused by population growth and freshwater shortage is the primary engineering challenge in the 21st century. , In addition, the polluting ions in industrial wastewater are harmful to the environment and human body. For instance, when using a cooling tower, calcium, magnesium, and bicarbonate dissolved in the cooling water are decomposed, and a loose off-white scale is formed around and at the bottom of the cooling tower, which leads to the failure of the equipment over time, thus affecting its service life.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchical MXene/Polypyrrole-Decorated Carbon Nanofibers for Asymmetrical Capacitive Deionization

Wang

Nian

et al. 2022

ACS Appl. Mater. Interfaces

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Membrane capacitive deionization (MCDI) has emerged as a promising electric-field-driven technology for brackish water desalination and specific salt or charged ion separation. The use of carbon-based or pseudocapacitive materials alone for MCDI usually suffers from the drawbacks of low desalination capacity and poor cycling stability due to their limited accessible adsorption sites and obstructed charge-carrier diffusion pathways. Therefore, developing a hybrid electrode material with multiple charge storage mechanisms and continuous electron/ion transport pathways that can synergistically improve its specific capacitance and cycling durability has currently become one of the most critical technical demands. Herein, we developed a novel hierarchically architectured hybrid electrode by first spinning MXene into polyacrylonitrile (PAN)-based carbon nanofibers (MCNFs) to obtain a highly conductive carbon nanocomposite framework. The excellent spatial support structure can effectively prevent the dense packing of Cl–- and DBS–-doped polypyrrole (PPy) molecular chains during the following electrodeposition process, which not only ensures the efficient transport of electrons in the continuous hybrid carbon nanofibrous skeleton but also provides abundant accessible sites for ion adsorption and insertion. The obtained self-supporting membrane electrodes (MCNF@PPy+Cl– and MCNF@PPy+DBS–) have the advantages of outstanding specific capacitance (318.4 and 153.9 F/g, respectively), low charge transfer resistance (10.0 and 5.3 Ω, respectively), and excellent cycling performance (78% and 90% capacitance retention ratios, respectively, after 250 electrochemical cycles). Furthermore, the asymmetrical membrane electrodes showed a superior desalination capacity of 91.2 mg g–1 in 500 mg/L NaCl aqueous solution and obvious divalent ion (Ca2+, Mg2+) selective adsorption properties in high-salt water from the cooling towers of thermal power plants.

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Section: Electrochemical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hierarchical MXene/Polypyrrole-Decorated Carbon Nanofibers for Asymmetrical Capacitive Deionization

Wang

Nian

et al. 2022

ACS Appl. Mater. Interfaces

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“…Thus, the technology performance in harsh marine conditions is unknown. Both methods rely heavily on membranes which are expensive and highly susceptible to fouling/scaling [70]. Specific to basification, there is limited research beyond preliminary bench-scale experiments, and the impact of replacing Ca 2+ by Na + in the waste returned to the coastal environment is not known.…”

Section: Bipolar Membrane Electrodialysismentioning

confidence: 99%

Ocean Deacidification Technologies for Marine Aquaculture

Myers

Subban

2022

JMSE

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The increase in partial pressure of CO2 in the oceans directly affects the productivity and survival of coastal industries and ecosystems. For marine aquaculture, the decreased alkalinity of seawater results in reduced availability of carbonates for marine organisms to build their shells, leading to decreased aquaculture quality and productivity. The industry has been implementing recirculating aquaculture systems (RASs) to reduce CO2 in feedwaters, but recent interest in ocean-based CO2 capture has led to additional strategies that may be relevant. The new methods in addition to CO2 removal offer capture options for enhanced aquaculture sustainability. Here, we review and compare early-stage and commercially available technologies for deacidification of seawater and their suitability for aquaculture. Most methods considered rely on a voltage-induced pH swing to shift the carbonate/bicarbonate equilibrium toward the release of CO2, with subsequent capture of the released CO2 as a gas or as solid mineral carbonates. The modular design and distributed deployment potential of these systems offers promise, but current demonstrations are limited to bench scale, highlighting the need for sustained research and development before they can be implemented for marine aquaculture.

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“…Capacitive deionization (CDI) is a promising water treatment technology with the advantages of low energy consumption, renewable utilization, and simple operation. , CDI relies on applying a constant direct current (DC) voltage at both ends of the electrodes to make ions move to the cathode and anode and be adsorbed on the surface to form electrical double-layer capacitor (EDLC) to store ions. The desorption process is to apply a reverse voltage or directly short-circuit the electrodes to achieve regeneration. , The critical factor for CDI lies in the exploitation of high-quality electrodes.…”

Section: Introductionmentioning

confidence: 99%

Uniformly Dispersed Fe–N Active Centers on Hierarchical Carbon Electrode for High-Performance Capacitive Deionization: Plentiful Adsorption Sites and Conductive Electron Transfer

Liu,

Zhang,

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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Capacitive deionization (CDI) is a promising desalination technology to meet the growing demand for clean water resources. Carbon-based materials, as one of the most appealing electrode candidates for CDI, are still limited by low adsorption capacity and slow rates. Heteroatom doping of carbonaceous materials is considered a promising strategy for high-performance CDI desalination. Herein, hierarchically porous carbon with uniformly dispersed Fe–N active centers (FeNC) is fabricated by a one-step pyrolysis treatment from a Zn–Fe bimetal–organic framework. The systematic analysis demonstrated that the synergistic effect of the uniformly dispersed Fe and N increased the specific surface area and graphitization degree of the carbonaceous framework. Moreover, the electrochemical analysis confirmed that Fe intervention effectively increased the specific capacitance and reduced the charge-transfer resistance, ensuring a more desirable electrical double-layer capacitor (EDLC) behavior. As expected, FeNC exhibited an excellent electrosorption capacity of 28.88 mg g–1 and a faster rate (1.85 mg g–1 min–1). The results indicated that the introduction of trace Fe can not only modulate the structural properties of carbon materials to provide more accessible adsorption sites but also form Fe–N to accelerate electron transfer. This work provides a profound insight into the crucial role of Fe–N active centers in carbon-based CDI desalination.

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Capacitive deionized hybrid systems for wastewater treatment and desalination: A review on synergistic effects, mechanisms and challenges

Cited by 49 publications

References 126 publications

Hierarchical MXene/Polypyrrole-Decorated Carbon Nanofibers for Asymmetrical Capacitive Deionization

Hierarchical MXene/Polypyrrole-Decorated Carbon Nanofibers for Asymmetrical Capacitive Deionization

Ocean Deacidification Technologies for Marine Aquaculture

Uniformly Dispersed Fe–N Active Centers on Hierarchical Carbon Electrode for High-Performance Capacitive Deionization: Plentiful Adsorption Sites and Conductive Electron Transfer

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