Carbon nitride-based photocatalyst and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2020055036-A1
Application number	US-201716487177-A
Country	US
Kind code	A1
Filing date	Jul 3, 2017
Priority date	Mar 6, 2017
Publication date	Feb 20, 2020
Grant date	—

Abstract

The present invention provides a carbon nitride-based photocatalyst and a preparation method thereof. The photocatalyst is prepared by reaction of melem with 3,3′,4,4′-benzophenonetetracarboxylic dianhydride. The photocatalyst according to an embodiment of the present invention achieves energy level matching in structure between the melem structure and the 3,3′,4,4′-benzophenonetetracarboxylic dianhydride, reduces a singlet-triplet energy gap (ΔEST), promotes an intersystem crossing process, thereby enhancing the singlet oxygen production and improving the selective photocatalytic oxidation ability.

First claim

1 . A carbon nitride-based photocatalyst prepared by reacting melem with 3,3′,4,4′-benzophenonetetracarboxylic dianhydride.

2 . The carbon nitride-based photocatalyst according to claim 1 , wherein a molar ratio of melem to the 3,3′,4,4′-benzophenonetetracarboxylic dianhydride is 5:1˜1:5

3 . A carbon nitride-based photocatalyst having the following structure:

4 . A method for preparing a carbon nitride-based photocatalyst, comprising:
preparing melem by polymerization of melamine; and obtaining the carbon nitride-based photocatalyst by reacting the melem with the 3,3′,4,4′-benzophenonetetracarboxylic dianhydride.

5 . The method according to claim 4 , wherein the melamine was polymerized at a temperature of 400˜500° C.

6 . The method according to claim 5 , comprising:
placing a melamine-containing crucible in a muffle furnace, and raising the temperature of the muffle furnace to 425° C. at a heating rate of 1.77 K/min; keeping the crucible at the above temperature for 4 h; and preparing the melem by removing the crucible from the muffle furnace and washing an obtained solid with water of 60˜80° C.

7 . The method according to claim 4 , wherein the molar ratio of the melem to the 3,3′,4,4′-benzophenonetetracarboxylic dianhydride is 5:1˜1:5.

8 . The method according to claim 7 , wherein the molar ratio of the melem to the 3,3′,4,4′-benzophenonetetracarboxylic dianhydride is 1:1.

9 . The method according to claim 4 , wherein the carbon nitride-based photocatalyst was obtained by reacting the melem with the 3,3′,4,4′-benzophenonetetracarboxylic dianhydride at 250 to 350° C.

10 . The method according to claim 9 , wherein a quartz boat containing the melem and the 3,3′,4,4′-benzophenonetetracarboxylic dianhydride was placed in a tube furnace, and the temperature of the tube furnace was increased to 300° C. at a heating rate of 5 K/min;
the quartz boat was kept at the above temperature for 4 h; and
the quartz boat was taken out from the tube furnace to obtain a solid, and the obtained solid was washed with N,N-dimethylformamide and ethanol respectively, to get the photocatalyst.

Assignees

• Univ China Petroleum East China

Inventors

• Wu Wenting
• Han Congcong
• Wu Mingbo
• Li Zhongtao
• Zhang Qinggang

Classifications

• B01J31/0247 Primary

  Imides, amides or imidates (R-C=NR(OR)) · CPC title

• C07C46/06

  of at least one hydroxy group on a six-membered aromatic ring · CPC title

• B01J27/24

  Nitrogen compounds · CPC title

• B01J31/06 Primary

  containing polymers {(organometallic polymers B01J31/123; polymer-bound organometallic complexes B01J31/165; coordination polymers B01J31/1691)} · CPC title

• B01J35/004

  Operations & Transport · mapped topic