Thermodynamics and kinetics of adsorption of ammonium ions by graphene laminate electrodes in capacitive deionization

Wimalasiri, Yasodinee; Mossad, Mohamed; Zou, Linda

doi:10.1016/j.desal.2014.11.015

Cited by 89 publications

(37 citation statements)

References 68 publications

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“…The faster SAR can be explained that with the increase of the NaCl concentration, the conductivity would increase correspondingly, and the transport of ions would be more rapid. 73,74 When the concentration of NaCl solution increased, the SAC vs. SAR change less, this is mainly due to that the electrodes have nearly approached the capacity limit.…”

Section: Deionization Performancementioning

confidence: 99%

Removal of NaCl from saltwater solutions using micro/mesoporous carbon sheets derived from watermelon peel via deionization capacitors

et al. 2017

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Section: Deionization Performancementioning

confidence: 99%

Removal of NaCl from saltwater solutions using micro/mesoporous carbon sheets derived from watermelon peel via deionization capacitors

et al. 2017

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“…The magnitude of the Arrhenius activation energy is used to distinguish the adsorption process as being physical or chemical. Generally, the activation energy of physical adsorption is 5 ∼40 kJ/mol, and the activation energy of chemical adsorption is greater than 40 kJ/mol . Thus, the adsorption of X‐3B dye on CMWBFS could be regarded as physical adsorption due to the small activation energy.…”

Section: Resultsmentioning

confidence: 99%

Transport of reactive X‐3B dye at the interface between cationic surfactant‐modified water‐quenched blast furnace slag and aqueous solution

Wang

Huang

et al. 2018

Can J Chem Eng

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There is an emerging interest in the utilization of low‐cost industrial wastes in sustainable pollution control. This study investigated the use of water‐quenched blast furnace slag modified by cetyltrimethyl ammonium bromide as a low‐cost adsorbent for the removal of reactive brilliant red X‐3B from an aqueous solution. The results showed that the removal efficiency increased with an increasing slag dosage and an appropriate dosage for adsorption was 8 g/L. The adsorption efficiency of X‐3B onto modified slag decreased when the pH increased from 2 to 12. The amount of dye uptake per unit of modified slag also increased with an increase in ionic strength, contact time, temperature, and initial dye concentration. The Freundlich isotherm model showed a good fit to the equilibrium adsorption data. Thermodynamic studies suggested the spontaneous and endothermic nature of the adsorption process. The adsorption kinetics followed the pseudo‐second‐order model and the rate constant increased with increasing temperature. These results can help understand the migration patterns of dye molecules at a modified slag‐water interface. It also has important implications for developing wastewater treatment techniques using low‐cost adsorbents.

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“…Several works on CDI evaluated the kinetics of electrosorption using pseudo-first andsecond order models [39][40][41]. Here in this study, kinetic models were also developed and executed to determine the preferential desorption among Na, K, and Mg ions.…”

Section: Desorption Kinetics Using Pseudo-first-order and Pseudo-secomentioning

confidence: 99%

Effect of Brine Water on Discharge of Cations in Membrane Capacitive Deionization and Its Implications on Nitrogen Recovery from Wastewater

Kim

Dorji

Gwak

et al. 2019

ACS Sustainable Chem. Eng.

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The ion desorption behavior from carbon electrodes onto high concentration brine was examined in this work because the ionic resources in brine are accumulated to attain high concentration in membrane capacitive deionization (MCDI) during mineral resource recovery. Several major issues were explored to demonstrate the suitability of MCDI for mineral recovery: ion discharge behavior using different solution chemistries (0 to 10 mM of NaCl, KCl, and MgCl2) of feed and brine, desorption efficiencies of various electrode regeneration methods (reverse polarity, short-circuiting and power disconnection) for enrichment of ions, and ion desorption selectivity among selected cations (Na, K, and Mg). The desorption efficiency was inversely proportional to ionic strength of aqueous brine solution as the ions from electrodes migrate toward the brine solution against ionic-strength gradient. Furthermore, the desorption onto brine was constrained by utilizing energy-efficient short-circuiting, whereas the electrochemically adsorbed ions were well discharged by reversing the polarity compensating for its cost. The ions were preferentially released from the electrodes in order of Na>K>Mg in the results, showing a reverse trend with the selectivity of electrosorption. From ammonium recovery tests, a high concentration of ammonium in brine (78.54 mg/L) was obtained from the synthetic wastewater through continuous operation of five cycles, attributing to its selective desorption over sodium ions present. However, it must be noted that its incomplete discharge from the electrodes is a challenging issue to overcome the limitations of MCDI as a mineral recovery process, and to attain highly concentrated ammonium.

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Thermodynamics and kinetics of adsorption of ammonium ions by graphene laminate electrodes in capacitive deionization

Cited by 89 publications

References 68 publications

Removal of NaCl from saltwater solutions using micro/mesoporous carbon sheets derived from watermelon peel via deionization capacitors

Removal of NaCl from saltwater solutions using micro/mesoporous carbon sheets derived from watermelon peel via deionization capacitors

Transport of reactive X‐3B dye at the interface between cationic surfactant‐modified water‐quenched blast furnace slag and aqueous solution

Effect of Brine Water on Discharge of Cations in Membrane Capacitive Deionization and Its Implications on Nitrogen Recovery from Wastewater

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