How can I neutralize MWCNTs after acid treatment ?

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Varun Chhabra

What you may try is to wash your MWCNTs with Deionized water with at least 4 times the volume of your acid solution and then Sonicate it with the help of ultrasonicator for 1 hr. before filtering out MWCNT's

Zeinab El Moussawi

Washing with excessive amounts of water during vacuum filtration would also be helpful.

Titus Sobisch

After washing use strong base like NaOH or KOH to obtain the ionized form (carboxylates).

Mubashar Rehman

I agree with all above. However, I have used 0.1 M NaOH solution which needed 4 to 5 washing.

Kaisar Raza

You have carboxylated the CNTs by use of strong oxidising acids. You should check the pH of washings of water till it become neutral. However the dispersion of carboxylated CNTs (though free from reaction mixture acid residues) will always be acidic due to generation of free carboxylic groups on CNTs.

Ahmed I. A. Abd El Mageed

Wash with deionized water or solution of sodium bicarbonates or sodium carbonates, of course with vacuum filtration ... You should watch the pH of the medium using either pH meter or litmus paper ... Good Luck

Sai Bhargava

Thank you all for your valuable suggestions....

By washing several times with DI water the solution came to neutral...