Adsorbents for removing heavy metals
Adsorbents for removing anions of a heavy metals and methods for using same are provided. Metal removing adsorbents comprise a porous material in which at least one oxygen-containing compound of iron, copper, aluminum, titanium, and/or zirconium is incorporated. The oxygen-containing compound may be incorporated into the porous media by impregnation or dispersion of a suitable precursor of such a compound. The precursor may be further treated to yield the oxygen-containing compound. Such adsorbents are particularly useful for removing arsenic and/or selenium from the environment and may be used in treating drinking water sources.
1. An adsorbent for use in removing heavy metal anions from a liquid or gas medium comprising a porous carbon having a BET surface area greater than about 10 m 2/ g and having incorporated therein iron (III) hydroxide, wherein said adsorbent is capable of interacting with said anions of said heavy metal to lower a concentration of said heavy metal in said liquid or gas.
2. The adsorbent according to claim 1 , wherein said anions comprise oxygen-containing species of said heavy metal.
3. The adsorbent according to claim 1 , wherein said iron (III) hydroxide is incorporated into said porous carbon by impregnation or dispersion within said adsorbent.
4. The adsorbent according to claim 1 , wherein said heavy metal is selected from the group consisting of arsenic, selenium, and combinations thereof.
5. The adsorbent according to claim 1 , wherein said iron (III) is present at a concentration of up to about 50% by weight of said adsorbent.
6. An adsorbent for use in removing heavy metal anions from a liquid or gas medium coniprising a porous carbon having a BET surface area greater than about 10 m 2/ g and having incorporated therein copper hydroxide, wherein said adsorbent is capable of interacting with said anions of said heavy metal to lower a concentration of said heavy metal in said liquid or gas.
7. The adsorbent according to claim 6 , wherein said anions comprise oxygen-containing species of said heavy metal.