In—NH2/g-C3N4 nanocomposite with visible-light photocatalytic activity and preparation and application thereof

Patent metadata

Field	Value
Publication number	US-11167274-B2
Application number	US-202016817547-A
Country	US
Kind code	B2
Filing date	Mar 12, 2020
Priority date	May 16, 2019
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

The present invention provides an In—NH2/g-C3N4 nanocomposites with visible-light photocatalytic activity and application thereof, which can effectively remove organic pollutants (such as tetracycline) in water. First, the graphite phase carbonitride carbon (g-C3N4) was obtained by thermal condensation, and g-C3N4 nanosheet was prepared by thermal oxidative etching. Then, acicular MIL-68(In)—NH2 (In—NH2) was grown in situ on the surface of g-C3N4 nanosheet by solvothermal method. The In—NH2/g-C3N4 nanocomposites with high visible-light photocatalytic activity were obtained. The CNNS firstly was prepared in the present invention, which is beneficial to the needle-like In—NH2 growing on the surface of CNNS and having close interfacial contact with each other, forming a heterojunction, promoting the separation of photogenerated electrons and holes pairs, and enhancing visible-light photocatalytic degradation of organic pollutants. The nanocomposites show high structural stability and reusability, which has great potential in the field of water remediation.

First claim

The invention claimed is:

1. A method of preparing In—NH 2 /g-C 3 N 4 nanocomposites with visible-light photocatalytic activity comprises the following steps:
obtaining a g-C 3 N 4 nanosheet by oxidation etching of a g-C 3 N 4 powder in air; and
obtaining the In—NH 2 /g-C 3 N 4 nanocomposites by in-situ growth of In—NH 2 on the surface of the g-C 3 N 4 nanosheet by a solvothermal method.

2. The method according to claim 1 , wherein the temperature of the oxidation etching is 300 to 500° C. and the time of oxidation etching is 2 to 5 hours, and the temperature rising rate of the oxidation etching is 2 to 10° C./min.

3. The method according to claim 1 , wherein the g-C 3 N 4 nanosheet is dispersed in a solvent, an indium salt is added, an amino compound is added, a reaction is carried out at 80 to 150° C. for 2 to 10 hours, and the In—NH 2 is grown in situ on the surface of the g-C 3 N 4 nanosheet.

4. The method according to claim 3 , wherein the molar ratio of the indium salt to the amino compound is 1:(0.1 to 0.5); the mass ratio of the g-C 3 N 4 nanosheet to the indium salt is 1:(10 to 15).

5. The method according to claim 3 , wherein the solvent is dimethyl sulfoxide, N, N-dimethylformamide or N, N-dimethyl acetamide; the indium salt is indium nitrate or indium trichloride.

6. The method according to claim 1 , further comprising:
calcining urea at 550° C. for 4 hours in air, cooling to room temperature, and grounding to obtain the g-C 3 N 4 powder.

7. A method for preparing In—NH 2 , comprising:
dissolving an indium salt in a solvent, adding an amino compound, and then reacting at 80 to 150° C. for 2 to 10 hours, and finally, obtaining the In—NH 2 .

8. The method according to claim 7 , wherein a molar ratio of the indium salt to the amino compound is 1:(0.1 to 0.5); and the solvent is dimethyl sulfoxide, N, N-dimethylformamide or N, N-dimethylacetamide; the indium salt is indium nitrate or indium trichloride.

9. The In—NH 2 /g-C 3 N 4 nanocomposites with visible-light photocatalytic activity prepared according to claim 1 and used for photocatalytic degradation of organic pollutants in water.

10. The In—NH 2 prepared according to claim 7 and used for photocatalytic degradation of organic pollutants in water.

Assignees

• Univ Soochow

Inventors

• Lu Jianmei
• Xu Qingfeng

Classifications

• C02F2101/345

  Phenols · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C02F2101/38

  containing nitrogen · CPC title

• C02F1/30

  by irradiation · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title