Filter and sorbent for removal of contaminants from a fluid
AssigneeLayne Christensen Company
InventorPaul Sylvester
Life of this patent
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Abstract
Metal oxide modified or impregnated activated carbon as a sorbent to reduce multiple contaminants, such as arsenic and pesticide residues from a fluid.
Claims14
A first sorbent for removing at least one contaminant from a fluid, the first sorbent comprising first activated carbon modified to contain a plurality of first hydrated metal oxide particles substantially dispersed therein, the modified first activated carbon with a significantly greater capacity for arsenic and other inorganic metals and oxyanions compared to a second sorbent comprising first activated carbon modified by a direct precipitation method to contain a plurality of the hydrated metal oxide particles.
A filter to reduce a level of at least one contaminant in drinking water, the filter comprising a first sorbent comprising first activated carbon modified to contain particles of a first hydrated metal oxide substantially dispersed therein with a significantly greater capacity for arsenic and other inorganic metals and oxyanions compared to a second sorbent comprising activated carbon modified by a direct precipitation method to contain a plurality of hydrated metal oxide particles, and a containment device containing the first sorbent.
A method for synthesizing a first sorbent comprising
- contacting activated carbon with an oxidant under conditions to form an oxidant-bound carbon sorbent,
- removing unbound oxidant from the oxidant-bound carbon sorbent, and
- contacting the oxidant-bound carbon sorbent with a metal salt solution under conditions to impregnate metal oxide in the activated carbon to result in a metal oxide-impregnated carbon sorbent with significantly greater capacity for arsenic and other inorganic metals and oxyanions compared to a second sorbent comprising activated carbon modified by a direct precipitation method to contain a plurality of hydrated metal oxide particles.
Dependencies are inferred from the claim text.