Capture of mercury ions by natural and industrial materials

In this paper the technical feasibility of various adsorbents for mercury removal from contaminatedwaters has been studied. Adsorption isotherms of mercury ions in aqueous solution have been experimentally measured on a granular activated carbon (Aquacarb 207EATM), a char, a pozzolana and a yellow tuff. The experimental evidences show that the mercury capture capacity of yellow tuff and char is of few tenths of milligrams per gram of sorbent while for the pozzolana and the activated carbon this value is of the order of 1 mg/g of sorbent. Moreover, for a mercury concentration as high as 3 mg/l the pozzolana shows the highest adsorption capacity. This result seems to be quite nteresting, especially in consideration of the extremely low cost of this natural sorbent.