Good day, Francis Rey U. Cortes!

Can you provide some details to make your question more clear for understanding?

Yours sincerely,

M. Sc. Vadym Chibrikov

Department of Microstructure and Mechanics of Biomaterials

Institute of Agrophysics, Polish Academy of Sciences

Vadym Chibrikov I used concentrated nitric acid for oxidative treatment to increase carboxylic functional group content on my nanoparticles. How can I remove the nitric acid from this solution? I only want nanoparticles without the nitric acid after the treatment. Thank you for your response!

Good day, Francis Rey U. Cortes!

Here I have found another SOP: "After 12 h of treatment, the dispersion was placed into an ice bath in order to cool down it to room temperature. The dispersion was centrifuged for 10 min at 3,500 rpm for sedimenting solid residues and separating the supernatant from the mixture. The supernatant was filtered in a Millipore system under vacuum by using a polytetrafluoroethylene (PTFE) membrane of 0.22 lm and they were analyzed through UV–Vis light absorption spectroscopy. The solid residue was washed with deionized water so that the excess of nitric acid was removed from the sample. The washing process of the solid residue was repeated until the filtrate reached the pH of the deionized water. Finally, MWCNTs were neutralized and dried on a polyvinylidene fluoride (PVDF) membrane. The solid residue was dried under vacuum for subsequent analysis."

Here is a link:

Article Temperature effects on the nitric acid oxidation of industri...

Best of luck in your research!

Yours sincerely,

M. Sc. Vadym Chibrikov

Department of Microstructure and Mechanics of Biomaterials

Institute of Agrophysics, Polish Academy of Sciences