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Adsorption Processes in Capacitive Deionization

Vaezi, Mehran | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51329 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Taghavinia, Nima
  7. Abstract:
  8. Today the water crisis affects billions around the world.According to existance of large amount of salty water on the earth, it seems one of the best soloution is desalination of salty water.There are methods for removing ions from water such as thermal methods, membrane methods , chemical methods and capacitive deionization.Capacitive deionization is based on the deviation of ions in the electric field.CDI system contains of two conductive porous electrodes that an elecric field is applied between them.While the brine pass through the space between the elecrodes the ions are absorbed by elecrodes. After a while the electrodes get saturated so a reverse potential is needed to regenerate the electrodes. In this research at frist the capacitive deionization set-up was made. The elecrodes are prepared in three different methods. In the first in order to attach the porous carbon to the current collector an industrial binder is used. The industrial binder is mixed with carbon materials to become conductive. Graphite exfoliation is the main idea of the second method . If we use a graphite sheet as the anode elecrode in the salty electrolyte the graphite sheet starts to exfoliate and porous condutive structure is made. In the third method ,a Slurry of Poly vinyl alcohol and activated carbon and citric acid is prepared as electrode material and spreaded on the current collector. Different parameters of each method is optimized by measuring the specific capacitance in cyclic voltammetry method. Finally the best electrode in each method is prepared and examined its ion removal quality in capacitive deionization setup
  9. Keywords:
  10. Specific Capacitance ; Desalination ; Capacitive Deionization ; Carbon Electrode ; Ion Adsorption ; Porous Electrode

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