Adsorbents for removing heavy metals and methods for producing and using the same
AssigneeCalgon Carbon Corporation
InventorToan Phan Vo
Life of this patent
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Abstract
Adsorbents for removing anions of a heavy metals comprise a porous carbon in which at least one oxygen-containing compound of iron, copper, and/or aluminum is incorporated. The oxygen-containing compound may be incorporated into the porous carbon 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.
Claims33
A carbon 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 100 m2/g and having incorporated therein at least one oxygen-containing compound of at least one metal selected from the group consisting of iron (II) and aluminum, or combinations thereof, 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.
An adsorbent for removing heavy metal anions from a liquid or gas medium surrounding said adsorbent, said adsorbent comprising a porous carbon having incorporated therein at least one oxygen-containing compound of at least one metal selected from the group consisting of iron (II) and aluminum or combinations thereof, wherein said metal is present at a concentration in the range from about 0.01 to about 50 percent by weight of said porous carbon;
- said oxygen-containing compound being selected from the group consisting of oxides, hydroxides and combinations thereof;
- and said adsorbent having a BET surface area greater than about 100 m2/g, 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.
A method for making a carbon adsorbent for use in removing heavy metal anions from a liquid or gas medium containing said heavy metal, said method comprising the steps of:
- (1) providing a porous carbonaceous adsorbent;
- (2) impregnating said porous carbonaceous adsorbent with a solution comprising at least one compound of at least one metal selected from the group consisting of iron (II) and aluminum or combinations thereof;
- and
- (3) converting said compound into an oxygen-containing compound of said metal to produce said carbon adsorbent;
- 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.
A method for making a carbon adsorbent for use in removing heavy metal anions from a liquid or gas medium, said method comprising the steps of:
- (1) pulverizing a carbonaceous material, a binder, and at least one compound of a metal selected from the group consisting of iron (II) and aluminum or combinations thereof to form a powdered mixture;
- (2) compacting said powdered mixture into shaped objects;
- (3) crushing and screening the shaped objects into a metal-containing particulate material;
- and
- (4) gasifying said metal-containing particulate material to produce said carbon adsorbent;
- 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.
A carbon 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 100 m2/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.
A method for making a carbon adsorbent for use in removing heavy metal anions from a liquid or gas medium containing said heavy metal anions, said method comprising the steps of:
- (1) providing a porous carbonaceous adsorbent;
- (2) impregnating said porous carbonaceous adsorbent with a solution comprising at least one compound of iron (III);
- and
- (3) converting said compound into iron (III) hydroxide to produce said carbon adsorbent;
- wherein said carbon adsorbent is capable of lowering a concentration of said heavy metal anions in said liquid or gas medium.
A method for making a carbon adsorbent for use in removing heavy metal anions from a liquid or gas medium, said method comprising the steps of:
- (1) pulverizing a carbonaceous material, a binder, and at least one compound of iron (III) to form a powdered mixture;
- (2) compacting said powdered mixture into shaped objects;
- (3) crushing and screening the shaped objects into an iron (III)-containing particulate material;
- and
- (4) gasifying said iron (III)-containing particulate material to produce said carbon adsorbent;
- wherein said carbon adsorbent is capable of lowering a concentration of said heavy metal anions in said liquid or gas medium.
A carbon 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 100 m2/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.
Dependencies are inferred from the claim text.