so basically, I made 2 samples of graphene oxide using improved hummer method, after washing 1 sample has orange brown color with a PH of 3 after 10 time washing with DI water, the other sample is black color with a PH of 5 after same number of washing, what could be the reason? why my 1st sample's PH is not increasing ?
Muhammad Hassaan Hamid
Graphene oxide nanoparticles have carboxyl groups -COOH on their surface, which dissociate when washed with distilled water to form a proton. Excess protons in water create a low pH.
Yuri Mirgorod Thanks for the response so it means after decanting the water from the graphene oxide then we should measure the PH
Muhammad Hassaan Hamid
If there are carboxyl groups on the surface of graphene oxide nanoparticles, then it is useless to wash it in order to change the pH.
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