the use of nanomaterials in removing the mercury from water is advantageous because of the high surface area to volume ratio and the fact that they are easily chemically functionalized. nanomaterials capture five times more mercury than the maximum mercury captured predicted through the use of previous mercury filtration systems. compared to other np-based methods for hg2+ removal from high salt matrix, tween 20-au nps is a rapid and selective technique with high efficiency. for purification of drinking water, it is advisable to use nano-tablets with the filters because they are easily accessible and cost efficient.