Production of carboxylated nanocelluloses
AssigneeThe Research Foundation for The State University of New York
InventorsBenjamin S. Hsiao, Benjamin Chu, Priyanka R. Sharma
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Abstract
The present disclosure provides methods for producing carboxylated nanocelluloses. Compared with conventional methods, the methods of the present disclosure are simple and cost-effective in the production of carboxylated (or carboxy) nanocelluloses, in embodiments nanofibers and/or nanowhiskers, directly from raw biomass, including lignocellulose wood, non-wood sources, non-lignocellulose wood, lignocellulose or pure cellulose. The carboxy groups on the surface of nanocellulose thus produced can then be easily modified into functional derivatives such as amide, acetate, ether, ester, etc. The resulting nanocelluloses may be used to form purifying agents and/or filters to remove impurities from wastewater.
Claims25
A method comprising:
- contacting plant biomass with an acid component comprising nitric acid to form a first mixture;
- contacting the first mixture with an oxidizing agent including a nitrate salt selected from potassium nitrate, calcium nitrate, magnesium nitrate, lithium nitrate, ammonium nitrate, nitrate esters, or combinations thereof to form a second mixture;
- holding the second mixture at a temperature from about 40° C. to about 100° C., for a period of time from about 30 minutes to about 72 hours;
- and
- recovering carboxycellulose nanofibers from the second mixture.
A method comprising:
- contacting plant biomass with an acid component comprising nitric acid, the acid component at a concentration from about 10 mmol to about 300 mmol, to form a first mixture;
- contacting the first mixture with an oxidizing agent including a nitrate salt selected from potassium nitrate, calcium nitrate, magnesium nitrate, lithium nitrate, ammonium nitrate, nitrate esters, or combinations thereof, the oxidizing agent at a concentration from about 0.1 mmol to about 60 mmol, to form a second mixture;
- holding the second mixture at a temperature from about 40° C. to about 100° C., for a period of time from about 30 minutes to about 72 hours;
- and
- recovering carboxycellulose nanofibers from the second mixture.
A method comprising:
- contacting plant biomass with an acid component including nitric acid, the acid component at a concentration from about 10 mmol to about 300 mmol, to form a first mixture;
- contacting the first mixture with an oxidizing agent including a nitrate salt selected from potassium nitrate, calcium nitrate, magnesium nitrate, lithium nitrate, ammonium nitrate, nitrate esters, or combinations thereof, the oxidizing agent at a concentration from about 0.1 mmol to about 60 mmol, to form a second mixture;
- holding the second mixture at a temperature from about 40° C. to about 70° C., for a period of time from about 30 minutes to about 72 hours;
- and
- recovering carboxycellulose nanofibers from the second mixture.
Dependencies are inferred from the claim text.