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US 8,138,117 B2Granted
Functionalized sorbent for chemical separations and sequential forming process
AssigneeBattelle Memorial Institute
InventorsGlen E. Fryxell, Thomas S. Zemanian
Life of this patent
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Abstract
A highly functionalized sorbent and sequential process for making are disclosed. The sorbent includes organic short-length amino silanes and organic oligomeric polyfunctional amino silanes that are dispersed within pores of a porous support that form a 3-dimensional structure containing highly functionalized active binding sites for sorption of analytes.
Claims21
A sequentially functionalized sorbent for chemical capture and retention of a target analyte, comprising:
- a porous support comprising pores functionalized with short-chain alkyl aminosilanes interspersed between polyfunctional oligomeric aminosilanes, wherein said short-chain alkyl aminosilanes include a tether group with a chain length of 4 atoms or less and a terminal amine group coupled thereto with a chain length of 7 atoms or less, wherein said short-chain alkyl aminosilanes and said oligomeric aminosilanes provide a uniform density of active binding sites within said pores defined by a quantity of nitrogen greater than or equal to about 5.0×10−3 mmoL N per m2 of pore surface area for chemical binding and retention of said target analyte therein.
A method for making a sorbent for retention of a target analyte, comprising the steps of:
- sequentially functionalizing pores of porous support by:
- 1) attaching a quantity of short-chain alkyl aminosilanes within said pores to passivate surfaces therein, wherein said short-chain alkyl aminosilanes include a tether group portion with a chain length of 4 atoms or less and a terminal amine group portion with a chain length of 7 atoms or less coupled thereto, allowing unhindered passage of larger molecules within said pores thereafter;
- 2) interspersing polyfunctional oligomeric aminosilanes within said pores between said short-chain alkyl aminosilanes and chemically anchoring same therein;
- and
- 3) backfilling said pores with another quantity of short-chain alkyl aminosilanes to maximize density of active binding sites within said pores;
- wherein said short-chain alkyl aminosilanes and said oligomeric aminosilanes provide a uniform density of active binding sites within said pores defined by a quantity of nitrogen greater than or equal to about 5.0×10−3 mmol. N per m2 of pore surface area for chemical binding and retention of said target analyte therein.
3 more elements
Dependencies are inferred from the claim text.