Simultaneous analysis of electrosorption capacity and kinetics for CDI desalination using different electrode configurations

Zornitta, Rafael L.; Ruotolo, Luís A.M.

doi:10.1016/j.cej.2017.09.067

Cited by 69 publications

(37 citation statements)

References 43 publications

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“…N. Li et al () plated IEMs on activated carbon electrodes for CDI applications and found that the salt removal efficiency was significantly increased by 131%, while the energy consumption was decreased by 25%. Similar CDI modifications with membranes were conducted by Zornitta and Ruotolo (), where the salt adsorption capacity increased from the CDI's 14.9 mg/g to the MCDI's 20.0 mg/g and the energy consumption was reduced by 21%.…”

Section: Introductionsupporting

confidence: 55%

Modeling and interpretation of membrane capacitive deionization responses to different salt load

Zhu

Stewart

et al. 2019

AWWA Water Science

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Membrane capacitive deionization (MCDI) has been found to offer beneficial aspects compared with regular capacitive deionization as a promising process for water desalination. This research varied the salt load in a bench-scale MCDI system and presented a kinetic model for describing its dynamic response of electrosorption and desorption. A pseudofirst-order kinetic model was found to describe the MCDI process well according to graphical analyses of fitting results. Both regression and verification R 2 values were greater than 0.97. Utilization of the model for the prediction of MCDI performance under the influences of initial salt concentration and flow rate led to proper calibration strategies. The impacts of the two parameters on both electrosorption and desorption can be interpreted by a layer resistance theory. Results of this research are beneficial for water professionals for improving desalination efficiency of an MCDI system as consideration of parameter settings is necessary for proper calibration and operation. K E Y W O R D S desorption, electrical double layer, electrosorption, kinetic model, membrane capacitive deionization, resistance

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Section: Introductionsupporting

confidence: 55%

Modeling and interpretation of membrane capacitive deionization responses to different salt load

Zhu

Stewart

et al. 2019

AWWA Water Science

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“…This characteristic is important,a sC DI desalination operates in cycles and should be carefully designed to optimize the amount of salt removal duringl ong-term operations. [62] The correlation of the conductivity profile (Figure 9c)a nd the kinetic plot (Figure 9d)i se xemplified in Figure 10. During the beginning of the electrosorption process (points 1a nd 2), the adsorptionc apacity and rate increasew ith time.…”

Section: Basic Electrochemical Characterization In Aqueous 1 M Naclmentioning

confidence: 99%

Charge and Potential Balancing for Optimized Capacitive Deionization Using Lignin‐Derived, Low‐Cost Activated Carbon Electrodes

et al. 2018

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Lignin-derived carbon is introduced as a promising electrode material for water desalination by using capacitive deionization (CDI). Lignin is a low-cost precursor that is obtained from the cellulose and ethanol industries, and we used carbonization and subsequent KOH activation to obtain highly porous carbon. CDI cells with a pair of lignin-derived carbon electrodes presented an initially high salt adsorption capacity but rapidly lost their beneficial desalination performance. To capitalize on the high porosity of lignin-derived carbon and to stabilize the CDI performance, we then used asymmetric electrode configurations. By using electrodes of the same material but with different thicknesses, the desalination performance was stabilized through reduction of the potential at the positive electrode. To enhance the desalination capacity further, we used cell configurations with different materials for the positive and negative electrodes. The best performance was achieved by a cell with lignin-derived carbon as a negative electrode and commercial activated carbon as a positive electrode. Thereby, a maximum desalination capacity of 18.5 mg g was obtained with charge efficiency over 80 % and excellent performance retention over 100 cycles. The improvements were related to the difference in the potential of zero charge between the electrodes. Our work shows that an asymmetric cell configuration is a powerful tool to adapt otherwise inappropriate CDI electrode materials.

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“…Diante deste resultado resolveu-se utilizar a configuração assimétrica levando-se em consideração os valores de EPZC determinados por espectroscopia de impedância eletroquímica (EIE). Considerando que EPZC,PAC/YP (0,0 V vs. Ag/AgCl) < E0 < EPZC,PAC/S (0,3 V vs. Ag/AgCl), a assimetria foi feita utilizando-se o PAC/S e o YP-80F como eletrodos negativo e positivo, respectivamente (Zornitta, 2018), o que levou a um aumento expressivo da capacidade de eletrossorção para 11,2 mg/g (~1,9 vezes). Sendo assim, a configuração assimétrica foi utilizada nos experimentos em que se investigou a influência das condições de preparação do PAC/S.…”

Section: Resultados E Discussõesunclassified

“…Recentemente, Zornitta et al (2018), obtiveram carvões ativados produzidos a partir do polímero condutor polianilina (PAni) dopado com diferentes ânions. Estes materiais demonstraram uma grande capacidade de eletrossorção devido à sua elevada ASE (1268 -2652 m²/g) e à presença de mesoporos (6 -58%).…”

Section: Introductionunclassified

“…O carvão ativado obtido foi denominado de PAC/S. Uma estratégia visando a melhoria da capacidade de eletrossorção foi adotada, a criação de assimetria entre eletrodos com valores de potencial de carga zero (EPZC) diferentes, o que poderia levar a uma grande melhoria da capacidade de eletrossorção (Zornitta et al (2018)). Com o propósito de criar a assimetria, foi preparado um eletrodo com um carvão comercial, o YP-80F, fornecido pela empresa Kuraray.…”

Section: Introductionunclassified

See 1 more Smart Citation

Eletrodos Carvão Ativado De Polianilina Para Dessalinização Por Deionização Capacitiva

Manarin¹,

Ruotolo²

2019

Blucher Chemical Engineering Proceedings

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Simultaneous analysis of electrosorption capacity and kinetics for CDI desalination using different electrode configurations

Cited by 69 publications

References 43 publications

Modeling and interpretation of membrane capacitive deionization responses to different salt load

Modeling and interpretation of membrane capacitive deionization responses to different salt load

Charge and Potential Balancing for Optimized Capacitive Deionization Using Lignin‐Derived, Low‐Cost Activated Carbon Electrodes

Eletrodos Carvão Ativado De Polianilina Para Dessalinização Por Deionização Capacitiva

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