Compositions, methods, and devices for capturing phosphate from water

Patent metadata

Field	Value
Publication number	US-11136251-B2
Application number	US-201815934530-A
Country	US
Kind code	B2
Filing date	Mar 23, 2018
Priority date	Mar 23, 2017
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

The present disclosure provides compositions, methods, and devices for sensing, detecting, and/or selectively capturing phosphate from water. An exemplary method includes: contacting a ligand or a rare earth metal complex of a ligand as described herein with an aqueous phosphate-containing medium at a pH of 5 to 12 under conditions sufficient to bind phosphate (e.g., reversibly bind phosphate). In certain embodiments, the method further includes releasing the bound phosphate by contacting the bound phosphate complex with an aqueous medium at a pH of 0 to 4 under conditions sufficient to release the bound phosphate.

First claim

What is claimed is:

1. A ligand or a rare earth metal complex of the ligand selected from the group consisting of:
a) ligands of the formula:

wherein R is selected from the group consisting of

and combinations thereof;
wherein R″ is selected from the group consisting of

and combinations thereof; and
wherein optionally the rare earth metal of the rare earth metal complex of one or more of the ligands is selected from the group consisting of Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , and combinations thereof,
or a rare earth metal complex of the ligand;
b) ligands of the formula

wherein R is selected from the group consisting of

and combinations thereof;
wherein R″ is selected from the group consisting of

and combinations thereof; and
wherein optionally the rare earth metal of the rare earth metal complex of one or more of the ligands is selected from the group consisting of Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , and combinations thereof,

or a rare earth metal complex of the ligand;
c) ligands of the formula

wherein R is selected from the group consisting of

and combinations thereof;
wherein R″ is selected from the group consisting of

and combinations thereof; and
wherein optionally the rare earth metal of the rare earth metal complex of one or more of the ligands is selected from the group consisting of Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , and combinations thereof,

or a rare earth metal complex of the ligand;
d) ligands of the formula

wherein R is selected from the group consisting of

and combinations thereof;
wherein R′ is selected from the group consisting of

and combinations thereof;
wherein R″ is selected from the group consisting of

and combinations thereof; and
wherein optionally the rare earth metal of the rare earth metal complex of one or more of the ligands is selected from the group consisting of Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , and combinations thereof, or a rare earth metal complex of the ligand;
e) ligands of the formula

wherein R is selected from the group consisting of

and combinations thereof;
wherein R′ is selected from the group consisting of

and combinations thereof;
wherein R″ is selected from the group consisting of

and combinations thereof; and
wherein optionally the rare earth metal of the rare earth metal complex of one or more of the ligands is selected from the group consisting of Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , and combinations thereof,

or a rare earth metal complex of the ligand;
f) ligands of the formula

wherein R is selected from the group consisting of

and combinations thereof;
wherein R′ is selected from the group consisting of

and combinations thereof;
wherein R″ is selected from the group consisting of

and combinations thereof; and
wherein optionally the rare earth metal of the rare earth metal complex of one or more of the ligands is selected from the group consisting of Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , and combinations thereof, or a rare earth metal complex of the ligand; and
g) ligands of the formula

wherein R is selected from the group consisting of

and combinations thereof; and
wherein optionally the rare earth metal of the rare earth metal complex of one or more of the ligands is selected from the group consisting of Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , and combinations thereof.

2. The ligands or rare earth metal complexes of the ligand according to claim 1 , selected from ligands of the formula:

wherein R is selected from the group consisting of

and combinations thereof;
wherein R″ is selected from the group consisting of

and combinations thereof; and
wherein optionally the rare earth metal of the rare earth metal complex of one or more of the ligands is selected from the group consisting of Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ , Tm 3+ , Yb 3+ , Lu 3+ , and combinations thereof,
or a rare earth metal complex of the ligand.

3. The ligands or rare earth metal complexes of the ligand according to claim 1 , selected from ligands of the formula:

wherein R is selected from the group consisting of

and combinations thereof;
wherein R″ is selected

Assignees

• Univ Minnesota

Inventors

• Pierre Valerie Christine
• Pailloux Sylvie Lilliane
• Huang sheng-yin
• Raju Mandapati V Ramakrishnam

Classifications

• C02F2101/105

  Phosphorus compounds · CPC title

• C07C211/65

  Metal complexes of amines · CPC title

• C02F1/683 Primary

  by addition of complex-forming compounds · CPC title

• C07D213/89

  with hetero atoms directly attached to the ring nitrogen atom · CPC title

• C07C259/06

  having carbon atoms of hydroxamic groups bound to hydrogen atoms or to acyclic carbon atoms · CPC title