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US 11,123,694 B2Granted
Filtration apparatus containing graphene oxide membrane
AssigneeVia Separations, Inc.
InventorsMichelle MacLeod, Stephen Frayne, Brandon Ian MacDonald, Lymaris Ortiz Rivera, Brent Keller
Life of this patent
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Abstract
Embodiments described herein relate generally to graphene oxide membranes for fluid filtration and more specifically to graphene oxide membranes having tunable permeability, rejection rate, and flux. Some embodiments of the graphene oxide membranes disclosed herein are characterized as having a flux of at least about 2.5×10−4 gallons per square foot per day per psi with a 1 wt % lactose solution at room temperature, and a lactose rejection rate of at least 50% with a 1 wt % lactose solution.
Claims18
A filtration apparatus, comprising:
- a support substrate;
- and
- a graphene oxide membrane disposed on the support substrate, the graphene oxide membrane including a plurality of graphene oxide sheets, each of the graphene oxide sheets coupled to an adjacent graphene oxide sheet via a chemical linker, the chemical linker having Formula Ia-1:
- or Formula Ib:
- wherein:
- L1 is selected from —NH—, —C(═O)—NH—, or absent;
- L2 is selected from —C(═O)—NH—(CH2)n—, —(CH2)2—O—(CH2)n—, or —NH—(CH2)n—;
- L3 is selected from —C(═O)—NH—(CH2)m—, —C(═O)—NH—C(═O)—(CH3)2—S—(CH2)m—, or —NH—C(═O)—(CH3)2—S—(CH2)m—;
- A2 is selected from aryl, heteroaryl, C4-C10 heterocycloalkyl, C4-C10 cycloalkyl, or C4-C10 alkyl, wherein the aryl, heteroaryl, heterocycloalkyl, cycloalkyl, and alkyl can each be optionally substituted by one or more substituents selected from halo, C1-C4 alkoxy, or C1-C4 alkyl;
- n is 0-4;
- m is 0-4;
- denotes the point of coupling with a carbon atom on a graphene oxide sheet;
- the graphene oxide membrane has a flux of at least about 2.5×10−4 gallons per square foot per day per psi (GFD/psi) with a 1 wt % lactose solution at room temperature, and
- the graphene oxide membrane has a lactose rejection rate of at least 50% with a 1 wt % lactose solution.
11 more elements
A filtration apparatus, comprising:
- a support substrate;
- and
- a graphene oxide membrane disposed on the support substrate, the graphene oxide membrane including a plurality of graphene oxide sheets, each of the graphene oxide sheets coupled to an adjacent graphene oxide sheet via a chemical linker, the chemical linker having Formula Ia-1:
- or Formula Ib:
- wherein:
- L1 is selected from —NH—, —C(═O)—NH—, or absent;
- L2 is selected from —C(═O)—NH—(CH2)n—, —(CH2)2—O—(CH2)n—, or —NH—(CH2)n—;
- L3 is selected from —C(═O)—NH—(CH2)m—, —C(═O)—NH—C(═O)—(CH3)2—S—(CH2)m—, or —NH—C(═O)—(CH3)2—S—(CH2)m—;
- A2 is selected from aryl, heteroaryl, C4-C10 heterocycloalkyl, C4-C10 cycloalkyl, or C4-C10 alkyl, wherein the aryl, heteroaryl, heterocycloalkyl, cycloalkyl, and alkyl can each be optionally substituted by one or more substituents selected from halo, C1-C4 alkoxy, or C1-C4 alkyl;
- n is 0-4;
- m is 0-4;
- denotes the point of coupling with a carbon atom on a graphene oxide sheet;
- the graphene oxide membrane has a first lactose rejection rate of at least 50% with a first 1 wt % lactose solution at room temperature;
- and
- after the graphene oxide membrane is contacted with a solution that is at least 80° C. for a period of time, the graphene oxide membrane has a second lactose rejection rate of at least 50% with a second 1 wt % lactose solution at room temperature.
12 more elements
A filtration apparatus, comprising:
- a support substrate;
- and
- a graphene oxide membrane disposed on the support substrate, the graphene oxide membrane including a plurality of graphene oxide sheets, each of the graphene oxide sheets coupled to an adjacent graphene oxide sheet via a chemical linker, the chemical linker having Formula Ia-1:
- or Formula Ib:
- wherein:
- L1 is selected from —NH—, —C(═O)—NH—, or absent;
- L2 is selected from —C(═O)—NH—(CH2)n—, —(CH2)2—O—(CH2)n—, or —NH—(CH2)n—;
- L3 is selected from —C(═O)—NH—(CH2)m—, —(═O)—NH—C(═O)—(CH3)2—S—(CH2)m—, or —NH—C(═O)—(CH3)2—S—(CH2)m—;
- A2 is selected from aryl, heteroaryl, C4-C10 heterocycloalkyl, C4-C10 cycloalkyl, or C4-C10 alkyl, wherein the aryl, heteroaryl, heterocycloalkyl, cycloalkyl, and alkyl can each be optionally substituted by one or more substituents selected from halo, C1-C4 alkoxy, or C1-C4 alkyl;
- n is 0-4;
- m is 0-4;
- denotes the point of coupling with a carbon atom on a graphene oxide sheet;
- the graphene oxide membrane has a first lactose rejection rate of at least 50% with a first 1 wt % lactose solution at room temperature;
- and
- after the graphene oxide membrane is contacted with a solution having a pH of at least 11 for a period of time at room temperature, the graphene oxide membrane has a second lactose rejection rate of at least 50% with a second 1 wt % lactose solution at room temperature.
12 more elements
Dependencies are inferred from the claim text.