Composition and process for mercury removal

A composition comprising a precipitated copper sulfide made by the process of combining a copper source, sulfide source, and modifier;

• wherein the copper source is selected from copper nitrate, copper sulfate, copper phosphate, copper acetate, copper carbonate, copper hydroxide, copper ammonium carbonate, and copper hydroxycarbonate;
• wherein the sulfide source is selected from hydrogen sulfide (H2S), carbonyl sulfide (COS), salts of sulfide (S2−), salts of hydrosulfide (HS−), and salts of polysulfide (Sn2−);
• and
• wherein the modifier is selected from alumina, silica, aluminosilicate, clay, zeolites, carbon, cement, titania, zirconia.

A process for making a precipitated metal sulfide comprising mixing an aqueous solution of a copper source, an aqueous solution of a sulfide source, and a modifier;

• wherein the copper source is selected from copper nitrate, copper sulfate, copper phosphate, copper acetate, copper carbonate, copper hydroxide, copper ammonium carbonate, and copper hydroxycarbonate;
• wherein the sulfide source is selected from hydrogen sulfide (H2S), carbonyl sulfide (COS), salts of sulfide (S2−), salts of hydrosulfide (HS−), and salts of poly sulfide (Sn2−);
• and
• wherein the modifier is selected from alumina, silica, aluminosilicate, clay, zeolites, carbon, cement, titania, zirconia.