Capacitive deionization

[lunkinghk]

Dear All, I created a system as the pic showing as below:

 

1. 6 x 9-V batteries in series (54V)

2. 2 x capacitors (0.1 uF, 63V)

3. 2 x activated carbon cotton board electrodes (distance between the electrodes is 1 cm)

4. The solution is water with 1.3% table salt

 

After connecting all wires, i put the electrodes in the solution, and hope the ions attached onto the electrodes, After 1 hour, I took the electrodes out of the solution, but I found the concentration of salt was still 1.3%. Please tell me what thing I did wrong.

 

THX

[John Cuthber]

Why have you put the capacitors in there?

(It still won't work without them, but they will stop any current flowing once they are charged, and that will only take something like 2.7 µ Coulombs.)

[lunkinghk]

Thank you for your reply. I put the capacitors in there because i just would like to absorb the ions onto the cotton board but avoid electrolysis of water appearing or chlorine gas production.

 

Please let me know why it did not work even without the capacitors. Thanks.