Uptake of mercury by exhausted coffee grounds

Adsorption of heavy metals by exhausted coffee grounds as a potential treatment method for waste waters

“…The adsorption equilibria were investigated using pH 5.0 solutions containing 3.0 g·L −1 of coffee grounds and metal ion concentrations in the range 20-200 µM. The results were then fitted to a Langmuir isotherm [7] as follows:…”

Removal and preconcentration of inorganic and methyl mercury from aqueous media using a sorbent prepared from the plant Coriandrum sativum

“…Some of the various sorbents that have been used are coal-fly ash [6], peat moss [7], coffee grounds [8], chemically modified cotton [9], barks of trees [10], bicarbonate treated peanut hull [11], waste rubber [12] and bagasse pith [13]. Despite the fact that a variety of treatment methods are available, these methods are not equally effective for the removal of both inorganic and organic forms of mercury.…”

Biosorption of mercury from aqueous solutions by powdered leaves of castor tree (Ricinus communis L.)

“…Some studies suggested the use of microorganisms [6,7], others used living [8] and non-living biosorbents such as dried plant leaves, roots [9][10][11], wheat shell [12], tea leaves [13] and algae [14]. A number of sorbents such as coal-fly ash [15] and coffee grounds [16] were used to remove mercury from aqueous solutions. Others used Ulva lactuca biomass [17] and marine macroalga (Cystoseira baccata) [18].…”