Back to results
US 12,269,756 B2Granted
Hydrogel nanobeads for adsorption of pollutants from wastewater
AssigneeKing Saud University
InventorsJaved Alam, Mansour Salah Alhoshan, Fekri Abdulraqeb Ahmed Ali, Arun Kumar Shukla
Life of this patent
Estimating the term…
Abstract
Hydrogel nanobeads include an ionically crosslinked sulfated polysaccharide biopolymer such as a carrageenan. In an embodiment, the hydrogel nanobeads comprise kappa carrageenan (κCg) and a metal ion crosslinking agent. In an embodiment, the metal ion crosslinking agent includes a metal ion selected from the group consisting of Zn2+, Fe2+, Fe3+, and Ti3+. The hydrogel nanobeads can be used for removal of pollutants in wastewater.
Claims2
A method for making crosslinked hydrogel nanobeads, comprising:
- providing an aqueous solution of zinc chloride;
- providing an aqueous solution comprising a carrageenan;
- adding the aqueous solution of zinc chloride to the aqueous solution comprising the carrageenan to obtain a combined aqueous solution;
- stirring vigorously the aqueous solution of zinc chloride in the aqueous solution of carrageenan at about 300 rpm to about 400 rpm for ionically crosslinking the carrageenan with a metal ion crosslinking agent in the combined aqueous solution, the metal ion crosslinking agent comprising Zn2+ having a concentration ranging from about 0.01 wt % to about 1.0 wt %;
- and
- obtaining the thus formed crosslinked hydrogel nanobeads, the hydrogel nanobeads being spherical in shape with a size ranging from about 20 nm to about 100 nm.
3 more elements
Dependencies are inferred from the claim text.