Amine functionalized chitin for removing munitions compounds from solution
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsLuke A. Gurtowski, Manoj K. Shukla, David P. Martin, Christopher S. Griggs
Life of this patent
Estimating the term…
Abstract
The invention is a renewable adsorbent material, amine-functionalized chitin (AFC) that can remove the following munitions compounds from solution while providing a concentration-dependent color change: NTO, DNAN, and TNT. Adsorption of the munitions constituents can be adjusted by pH; neutral pH provides maximum adsorption. NTO can desorb from the AFC at pH levels of 2 and 12; DNAN and TNT remain attached to AFC once adsorbed.
Claims20
A method for forming an amine functionalized chitin compound comprised of the steps of:
- forming an aqueous chitin sodium hydroxide solution;
- forming a chloroform tosyl chloride solution;
- combining said aqueous chitin sodium hydroxide solution and said chloroform tosyl chloride solution to form a tosyl chitin binding solution that contains tosyl chitin;
- wherein said tosyl chitin is comprised of chitin molecules with tosyl molecules bound to said chitin molecules;
- solidifying said tosyl chitin;
- washing solidified tosyl chitin;
- filtering said solidified tosyl chitin to extract a quantity of tosyl chitin;
- adding said tosyl chitin to a DMSO solution to create an amine group-exposed solution;
- wherein said DMSO solution includes dimethyl sulfoxide (DMSO) and amine group molecules;
- and
- heating said DMSO solution until said tosyl molecules separate from said chitin molecules and said amine group molecules bind to said chitin molecules to create amine functionalized chitin molecules within said DMSO solution.
Dependencies are inferred from the claim text.