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US 12,297,128 B2Granted
Hydrogel nanobeads for adsorption of pollutants from wastewater
AssigneeKing Saud University
InventorsJaved Alam, Mansour Salah Alhoshan, Fekri Abdulraqeb Ahmed Ali, Arun Kumar Shukla
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Abstract
Hydrogel nanobeads include an ionically crosslinked sulfated polysaccharide biopolymer such as a carrageenan. In an embodiment, the hydrogel nanobeads comprise kappa carrageenan (KCg) 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
Crosslinked hydrogel nanobeads prepared according to a method comprising:
- providing an aqueous solution of a zinc chloride;
- providing an aqueous solution comprising a carrageenan, wherein the carrageenan is kappa-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.