Tailoring new covalent organic framework for highly efficient iodine capture

Patent metadata

Field	Value
Publication number	US-12318754-B2
Application number	US-202418956674-A
Country	US
Kind code	B2
Filing date	Nov 22, 2024
Priority date	Jul 28, 2023
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

The phosphazene covalent organic framework (COF) is a material with high efficiency to improve the removal of iodine from nuclear waste. The COF can be obtained by a solvothermal reaction of hexa(4-formyl-phenoxy)cyclotriphosphazene and 1,3,6,8-tetra(aminophenyl)pyrene. The resulting three-dimensional phosphazene COF has iodine uptakes as high as 9.4 g g −1 due to its 3D framework with higher specific surface areas and interconnected channels.

First claim

The invention claimed is:

1. A phosphazene covalent organic framework (MA-COF) having the formula:

2. The phosphazene covalent organic framework (MA-COF) of claim 1 , which is stable in a solvent selected from the group consisting of HCl, NaOH, DMF, DMSO, ethanol, boiling water, and any combination thereof.

3. The phosphazene covalent organic framework (MA-COF) of claim 1 , having an iodine adsorption capacity of about 9.4 g g −1 .

4. A method for removing iodine from liquid or vapor, the method comprising:
contacting the phosphazene covalent organic framework (MA-COF) of claim 1 with an iodine-containing liquid or vapor; and
adsorbing the iodine from the iodine-containing liquid or vapor onto the phosphazene covalent organic framework (MA-COF).

5. The method of claim 4 , wherein the phosphazene covalent organic framework (MA-COF) removes about 97% of the iodine from the iodine-containing liquid or vapor.

6. The method of claim 4 , wherein the phosphazene covalent organic framework (MA-COF) is capable of being reused in the method at least five times.

7. The method of claim 4 , wherein, after the iodine is adsorbed on the phosphazene covalent organic framework (MA-COF), the iodine can be released from the phosphazene covalent organic framework (MA-COF) at an efficiency of about 73% or greater within about 10 minutes.

8. The method of claim 4 , wherein, after the iodine is adsorbed on the phosphazene covalent organic framework (MA-COF), the iodine can be released from the phosphazene covalent organic framework (MA-COF) at an efficiency of about 80% or greater within about 60 minutes.

Assignees

• Univ United Arab Emirates

Inventors

• Alneyadi Shaikha
• Alhassani Mohammed Taleb Khamis
• Aleissaee Ali Saeed Saif
• Khalaf Abdullah Ayman
• Alteneiji Abdulrahman Abdullah Alhaj
• Jama Sultan Ali
• Alyaarbi Yaser Yusri Yaser

Classifications

• B01D53/685

  by treating the gases with solids · CPC title

• B01D2253/204

  Metal organic frameworks (MOF's) · CPC title

• C07F9/659

  having three phosphorus atoms as ring hetero atoms in the same ring {(C07F9/65812 takes precedence)} · CPC title

• G21F9/12

  by absorption; by adsorption; by ion-exchange · CPC title

• G21F9/02

  Treating gases · CPC title