2022 Summer Undergraduate Research Program (SURP) Symposium

Location

ScholarSpace, Rod Library, University of Northern Iowa

Presentation Type

Open Access Poster Presentation

Document Type

poster

Abstract

An aminimide is a zwitterionic group containing a cationic nitrogen bonded to an anionic nitrogen. The goal of this project was to use the steric bulk and electronic properties of the aminimide to block other species in a brine solution such as potassium, and selectively pick up lithium. To test this, polymethacrylate beads which contain carboxyl groups were modified to the desired aminimide. Three different aminimide groups were tested, a trimethylaminimide, aminopyridiniumaminimide, and a triethylaminimide. The modified beads would be introduced to a solution containing lithium and the lithium concentration was measured before and after exposure to the beads using atomic absorption spectroscopy. Our realistic brine solution contained 10,000 ppm K, 200 ppm Li. Only the aminopyridiniumaminimide and the triethylaminimide exhibited selectivity. The aminopyridiniumaminimide took up 43.9 ppm Li, while the triethylaminimide took up 59.35 ppm Li.

Start Date

29-7-2022 11:00 AM

End Date

29-7-2022 1:30 PM

Event Host

Summer Undergraduate Research Program, University of Northern Iowa

Faculty Advisor

Martin Chin

Department

Department of Chemistry and Biochemistry

File Format

application/pdf

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Jul 29th, 11:00 AM Jul 29th, 1:30 PM

Extracting Lithium Using the Steric Bulk of an Aminimide Functional Group

ScholarSpace, Rod Library, University of Northern Iowa

An aminimide is a zwitterionic group containing a cationic nitrogen bonded to an anionic nitrogen. The goal of this project was to use the steric bulk and electronic properties of the aminimide to block other species in a brine solution such as potassium, and selectively pick up lithium. To test this, polymethacrylate beads which contain carboxyl groups were modified to the desired aminimide. Three different aminimide groups were tested, a trimethylaminimide, aminopyridiniumaminimide, and a triethylaminimide. The modified beads would be introduced to a solution containing lithium and the lithium concentration was measured before and after exposure to the beads using atomic absorption spectroscopy. Our realistic brine solution contained 10,000 ppm K, 200 ppm Li. Only the aminopyridiniumaminimide and the triethylaminimide exhibited selectivity. The aminopyridiniumaminimide took up 43.9 ppm Li, while the triethylaminimide took up 59.35 ppm Li.