Near-infrared photothermal catalyst and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-11826744-B2
Application number	US-202217873223-A
Country	US
Kind code	B2
Filing date	Jul 26, 2022
Priority date	Jul 27, 2021
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

The present disclosure provides a near-infrared (NIR) photothermal catalyst and a preparation method and use thereof. The method includes: mixing a graphene oxide (GO) dispersion and a dehydrating agent to obtain a GO solution; mixing the GO solution and branched polyethyleneimine (PEI) and then drying to obtain a GO-PEI carrier; and mixing the GO-PEI carrier with water and adjusting a pH value to be within a range of 2 to 4.5, adding dropwise a monosubstituted Keggin-type polyoxometalate (POM) aqueous solution, and conducting an ion replacement reaction to obtain the NIR photothermal catalyst, wherein a solute of the monosubstituted Keggin-type POM aqueous solution is K 6 SiW 11 Co(H 2 O)O 39 or H 4 SiW 11 Ce(H 2 O) 4 O 39 .

First claim

What is claimed is:

1. A method for preparing a near-infrared (NIR) photothermal catalyst, comprising:
mixing a graphene oxide (GO) dispersion and a dehydrating agent to obtain a GO solution;
mixing the GO solution and branched polyethyleneimine (PEI) and then drying to obtain a GO-PEI carrier; and
mixing the GO-PEI carrier with water and adjusting a pH value to be within a range of 2 to 4.5, adding dropwise a monosubstituted Keggin-type polyoxometalate (POM) aqueous solution, and conducting an ion replacement reaction to obtain the NIR photothermal catalyst, wherein a solute of the monosubstituted Keggin-type POM aqueous solution is K 6 SiW 11 Co(H 2 O)O 39 or H 4 SiW 11 Ce(H 2 O) 4 O 39 .

2. The method according to claim 1 , wherein a molar ratio of GO to PEI in the GO-PEI carrier is 5:1, 1:1, 1:5, 1:10, 1:20, 1:40 or 1:100.

3. The method according to claim 1 , wherein a molecular weight M w of branched PEI is 1,800.

4. The method according to claim 1 , wherein the pH value is adjusted with a hydrochloric acid solution; the hydrochloric acid solution has a concentration of 1.0 mol/L.

5. The method according to claim 1 , wherein the ion replacement reaction is conducted at room temperature; the ion replacement reaction is conducted for 12 h to 24 h.

6. A NIR photothermal catalyst prepared by the method according to claim 1 , comprising a GO-PEI carrier and a POM loaded on a surface of the GO-PEI carrier, wherein the POM is K 6 SiW 11 Co(H 2 O)O 39 or H 4 SiW 11 Ce(H 2 O) 4 O 39 ; the POM is electrostatically attached to the surface of the GO-PEI carrier; and in the GO-PEI carrier, branched PEI is covalently grafted to GO.

7. The NIR photothermal catalyst according to claim 6 , wherein amass percentage of the POM in the NIR photothermal catalyst is within a range of 55% to 70%.

8. A method for using the NIR photothermal catalyst according to claim 6 , wherein the NIR photothermal catalyst is used in the field of photothermal catalysis.

9. The method according to claim 8 , wherein the NIR photothermal catalyst is used in the form of a NIR photothermal catalyst solution; and the NIR photothermal catalyst solution has a concentration of 5 mg/mL to 7 mg/mL.

10. The method according to claim 8 , wherein the NIR photothermal catalyst is used as a catalyst for a cycloaddition reaction of carbon dioxide (CO 2 ) and an epoxide.

11. The method according to claim 3 , wherein a molar ratio of GO to PEI in the GO-PEI carrier is 5:1, 1:1, 1:5, 1:10, 1:20, 1:40 or 1:100.

12. The NIR photothermal catalyst according to claim 6 , wherein a molar ratio of GO to PEI in the GO-PEI carrier is 5:1, 1:1, 1:5, 1:10, 1:20, 1:40 or 1:100.

13. The NIR photothermal catalyst according to claim 6 , wherein a molecular weight M w of branched PEI is 1,800.

14. The NIR photothermal catalyst according to claim 6 , wherein the pH value is adjusted with a hydrochloric acid solution; the hydrochloric acid solution has a concentration of 1.0 mol/L.

15. The NIR photothermal catalyst according to claim 6 , wherein the ion replacement reaction is conducted at room temperature; the ion replacement reaction is conducted for 12 h to 24 h.

16. The method according to claim 8 , wherein a mass percentage of the POM in the NIR photothermal catalyst is within a range of 55% to 70%.

Assignees

• Univ Jilin

Inventors

• Wu Lixin
• Chen Xiaofei
• Li Bao

Classifications

• B01J37/0236 Primary

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• B01J21/18

  Carbon · CPC title

• B01J35/004

  Operations & Transport · mapped topic

• B01J37/04

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J31/34 Primary

  of chromium, molybdenum or tungsten · CPC title