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Spoor, PB Peter; Veen, WR ter; Janssen, Ljj Jos

doi:10.1023/a:1017541927230

Cited by 60 publications

(5 citation statements)

References 13 publications

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“…Acidification of the catholyte was evidently caused by H + ion transport through the membrane, as reported for both homogeneous [15] and heterogeneous [16] organic anion-exchange membranes. On the other hand, OH ) ions generated at the cathode were partially neutralised by H + ions formed at the membrane surface by water splitting [17].…”

Section: Investigation Of Cr(vi) Transport Through Composite Ceramic supporting

confidence: 70%

Cr(VI) transport through ceramic ion-exchange membranes for treatment of industrial wastewaters

et al. 2006

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This work is devoted to assessment of the possibility of using ceramic membranes, which contain an ion-exchange component, such as hydrated zirconium dioxide (HZD), for Cr(VI) removal from dilute solutions by electrodialysis. Transport properties of the membranes were investigated. HZD-containing membranes were found to be permeable to anions in acidic media while they demonstrate cation-exchange properties in alkaline media. Cr(VI) anion transport through HZD membranes was studied. It was shown that an increase in the amount of ion-exchanger in the membrane results in a rise in electrodialysis efficiency. The transport number of Cr(VI) species was found to range from 0.33 to 0.63 for currents below the limiting current. It was also shown that increasing the concentration of H + or Cr(VI) ions in the solution to be purified allows higher rate of Cr(VI) ion transport through the membrane. List of symbols a activity (mol m )3 ) A area (m 2 ) C Cr,s concentration of Cr(VI) in the bulk of solution (mol m )3 ) C Cr,s 0 concentration of Cr(VI) in the solution at themembrane surface (mol m )3 ) D Cr,s Cr(VI) diffusion coefficient in the solution (m 2 s )1 ) d distance between the membrane and cathode (m) E cell voltage (V) E m membrane potential (V) F Faraday constant (96485 A s mol )1 ) i membrane current density calculated with allowance for the outersurface area (A m )2 ) i Cr,lim limiting membrane current density caused by transport of Cr(VI) ions (A m )2 ) k Cr mass transport coefficient of Cr(VI) ions (m s )1 ) L membrane length (m) N Cr,m flux of Cr(VI) ions through the membrane (mol m )2 s )1 ) N Na,m flux of Na + ions through the membrane (mol m )2 s )1 ) n Cr,a amount of Cr(VI) ions in the anolyte (mol) n Na,c amount of Na + ions in the catholyte (mol) R gas constant (8.314 J mol )1 K )1 ) T temperature (K) t Cr,m transport number of Cr(VI) ions through the membrane (dimensionless) t Cr,s transport number of Cr(VI) ions through the solution (dimensionless) u superficial flow rate (for the cathode compartment) (m s )1 ) z charge of species (dimensionless) Greeks c ratio of anion over cation valences (dimensionless) j specific conductivity (Ohm )1 m )1 ) s time (s, h) m kinematic viscosity (m 2 s )1 ) Dimensionless Groups ReReynolds number

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Section: Investigation Of Cr(vi) Transport Through Composite Ceramic supporting

confidence: 70%

Cr(VI) transport through ceramic ion-exchange membranes for treatment of industrial wastewaters

et al. 2006

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“…The time to short-circuit failure increased rapidly when the carboxylate content exceeded 0.6 mmol/g and clear differences at the anode were confirmed (Figure b–d). Trapping of metal ions using ion-exchange agents is one of the methods that can be used to suppress a short circuit. − Carboxyl groups present on the surface of cellulose nanofibers have also been used to trap metal ions. − It was reported that the amount of Cu ion adsorption increased up to 4 times with increasing carboxylate content . However, in this study, the short-circuit suppression effect increased more than 80-fold with increasing carboxylate content, and this cannot be explained by the simple ion-exchange behavior.…”

Section: Resultsmentioning

confidence: 65%

Cellulose Nanofiber Coatings on Cu Electrodes for Cohesive Protection against Water-Induced Short-Circuit Failures

Kasuga

Yagyu

Uetani

et al. 2021

ACS Appl. Nano Mater.

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Water is detrimental to electronic devices because it easily causes short circuits. The use of sealing to prevent water permeation is considered as the current conventional solution; however, the trend for developing flexible and stretchable electronic circuits has placed severe demands on waterproof technologies. This report describes a coating that protects circuits and prevents between-wire short circuits, even if the waterproof seals are damaged and the circuit becomes wet. We show that when Cu electrodes are coated with cellulose nanofibers (carboxylate content of 1.8 mmol/g), short circuits between the electrodes do not occur, even if the circuit is submerged in water for 24 h. The cellulose nanofibers accumulate at the anode because of electrophoresis, thereby forming a cohesive cellulose nanofiber layer that prevents short circuits between electrodes. Even if the cellulose nanofiber coating cracks because of external factors, the electrophoretic effect repairs the coating. This failure-containment mechanism is expected to be used in combination with existing waterproofing technology to dramatically improve the reliability of next-generation electronic devices under extreme operating conditions.

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“…Among techniques as chemical precipitation and ion exchange, two electrochemical methods are used to contribute to the solution of this serious environmental problem e.g. electrodialysis [52] and electrodeionization with simultaneously water recovery for reuse) [4,5,[9][10][11][12][13]. The proposed new electrostatic shielding electrodialysis cell with ICSs instead of ion exchange membranes has proved to be efficient also for the removal of heavy metal ions such as Ni fig.1b.…”

Section: +mentioning

confidence: 99%

“…Electrodialysis has been successfully performed over the last decades mainly in the production of potable water from brackish or seawater [6], regeneration of ion exchange resins [4,5] and production of pure or ultrapure water, demineralization and deacidification in food or pharmaceutical processing [7], purification of radioactive waste water in nuclear power plants [8] and recovery of water and valuable metals from industrial effluents [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A new process for desalination and electrodeionization of water by means of electrostatic shielding zones – ionic current sinks.

Dermentzis¹,

Papadopoulou²,

Christoforidis³

et al. 2009

JESTR

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We constructed electrostatic shielding zones made of electrode graphite powder and used them as a new type of ionic and electronic current sinks. Because of the local elimination of the applied electric field, voltage and current within the current sinks, ions are led inside them and accumulate there. The sinks become ion concentrating compartments whereas the adjacent compartments become ion depleting compartments. The proposed electrodeionization process uses no permselective ion exchange membranes. We implemented it in electrodialysis desalination of a synthetic brackish 0.03 M NaCl solution and obtained potable water with a NaCl concentration <500 mg L -1 . Furthermore, we performed electrodialysis of 0.002 M NiSO 4 and electrodeionization of 0.001 M NiSO 4 solutions with simultaneous electrochemical regeneration of the used ion exchange resin beds. By the continuous mode of electrodeionization of the 0.001 M NiSO 4 solution we obtained pure water with a Ni 2+ ion concentration of less than 0.5 mg L -1 at a flow rate of 2.3 x10 -4 L s -1 diluate stream

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Untitled

Cited by 60 publications

References 13 publications

Cr(VI) transport through ceramic ion-exchange membranes for treatment of industrial wastewaters

Cr(VI) transport through ceramic ion-exchange membranes for treatment of industrial wastewaters

Cellulose Nanofiber Coatings on Cu Electrodes for Cohesive Protection against Water-Induced Short-Circuit Failures

A new process for desalination and electrodeionization of water by means of electrostatic shielding zones – ionic current sinks.

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