As activated carbons are full of oxygenated moieties, they are very easily wetted by water, and therefore dispersing the powder in water is very easy and doesn't require additional functionalization. An even better wetting will be achieved with a few drops of surfactant in water, but this should not be really necessary. However, the density of carbon is about twice that of water, therefore carbon powder, even well dispersed at the beginning, will always fall down to the bottom of the container after a given time. There is no way to fight against gravity, as the difference of density between carbon and water is too high.

Alain

Thanks Dr. Alain, it is really good information, but do you any paper worked with dispersed PAC for contaminants removal. 

Regards,

You can see the attached papers. They explain how batch adsorption experiments in liquid phase can be done.

Alain

This other paper may help.

Alain

Thanks a lot for your support. 

Regards

Paper #90 presented at the Power Plant Pollutant Control Mega Symposium (April 19-22, 2014) by Ariel Li of ADA Carbon Solutions presents a carbon that is able to be water dispersed. The paper is titled "Field Demonstration of Advanced Activated Carbon for Mercury Control in Wet FGD".