Sorbent compositions for the removal of boron from aqueous mediums
AssigneeADA Carbon Solutions, LLC
InventorsMicala D. Mitchek, Roger H. Cayton, Joseph M. Wong, Robert B. Huston, Lingyan Song
Life of this patent
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Abstract
Sorbent compositions that include a base sorbent material having a high porosity and surface area and a boron-selective agent are particularly useful for the sequestration of boron from waste materials such as coal combustion residual leachate (CCRs). By using a boron-selective agent in conjunction with a high surface area base sorbent material such as activated carbon or biochar, a sorbent composition with a high capacity for sequestering boron at relatively low cost is provided.
Claims29
A sorbent composition comprising a base sorbent material selected from the group consisting essentially of activated carbon, biochar, alumina, silica, clays, zeolites, and combinations thereof and a boron-selective agent that is combined with the base sorbent material, wherein the boron-selective agent increases removal of boron from an aqueous medium as compared to an untreated base sorbent material,
- wherein the boron-selective agent comprises a compound selected from the group of compounds comprising 1,2 hydroxyl groups, 1,2 carboxyl groups, 1,2 carbonyl groups, 1,3 hydroxyl groups, 1,3 carboxyl groups, 1,3 carbonyl groups, and combinations thereof.
A sorbent composition comprising:
- a base sorbent material selected from the group consisting of activated carbon, biochar, and combinations thereof;
- and
- a boron-selective agent that is combined with the base sorbent material, wherein the boron-selective agent comprises a compound selected from the group of compounds comprising 1,2 hydroxyl groups, 1,2 carboxyl groups, 1,2 carbonyl groups, 1,3 hydroxyl groups, 1,3 carboxyl groups, 1,3 carbonyl groups, and combinations thereof.
A sorbent composition comprising:
- a base sorbent material selected from the group consisting of activated carbon, biochar, and combinations thereof and having a total pore volume of at least about 0.10 cc/g, a ratio of micropore volume to mesopore volume of at least about 0.7 and not greater than about 1.5, and a surface area of at least about 50 m2/g;
- and
- a boron-selective agent that is combined with the base sorbent material, wherein the boron-selective agent is present in an amount of at least about 0.1 wt. % to less than about 50 wt. % of the sorbent composition and comprises a compound selected from the group of compounds comprising 1,2 hydroxyl groups, 1,2 carboxyl groups, 1,2 carbonyl groups, 1,3 hydroxyl groups, 1,3 carboxyl groups, 1,3 carbonyl groups, and combinations thereof,
- wherein the boron-selective agent increases removal of one or more of elemental boron, a borate, and boric acid from an aqueous medium as compared to an untreated base sorbent material lacking the boron-selective agent.
Dependencies are inferred from the claim text.