Phosphorus-doped tubular carbon nitride micro-nano material and application thereof in catalytic treatment of exhaust gas

Patent metadata

Field	Value
Publication number	US-11577229-B2
Application number	US-202016809667-A
Country	US
Kind code	B2
Filing date	Mar 5, 2020
Priority date	Mar 5, 2019
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

The invention discloses a phosphorus-doped tubular carbon nitride micro-nano material and application thereof in waste gas treatment. Melamine is partially hydrolyzed into cyanuric acid through a phosphorous acid-assisted hydrothermal method to form a melamine-cyanuric acid super molecular precursor; the center of the precursor starts to be pyrolyzed under heating calcination, and thus phosphorus-doped tubular carbon nitride is obtained; the phosphorus-doped tubular carbon nitride and sodium borohydride are mixed and subjected to low-temperature calcination in an inert gas atmosphere, and defect-modified phosphorus-doped tubular carbon nitride is obtained. The defect-modified phosphorus-doped tubular carbon nitride micro-nano material has a good photocatalytic effect on catalytic degradation of waste gas; besides, the production raw materials are abundant and easy to obtain, and the phosphorus-doped tubular carbon nitride micro-nano material is good in stability and recyclable and has application prospects in waste gas treatment.

First claim

We claim:

1. An exhaust gas treatment method, consisting of the following steps:
(1) in the presence of phosphorous acid and water, hydrothermally reacting melamine, and then calcining the melamine to obtain phosphorus-doped tubular carbon nitride,
(2) mixing and calcing said phosphorus-doped tubular carbon nitride with sodium borohydride to obtain a phosphorus-doped tubular carbon nitride micro-nano material;
(3) passing the exhaust gas to be treated through the phosphorus-doped tubular carbon nitride or the phosphorus-doped tubular carbon nitride micro-nano material, and completing the exhaust gas treatment under illumination,
wherein in the step (1), the temperature of hydrothermal reaction is 180° C. and the time is 10 h; the calcination is carried out in an argon atmosphere, the heating rate is 2.5° C./min, the time is 4 h, and the calcination temperature is 500° C.; and the ratio of melamine, phosphorous acid and water is 1 g: 1.2 g: 100 mL;
wherein in the step (2), the calcination is carried out in an argon atmosphere, the heating rate is 10° C./min, the time is 30 min, and the calcination temperature is 150° C. to 250° C.; and the mass ratio of said phosphorus-doped tubular carbon nitride and said sodium borohydride is 5:1; and
wherein in the step (3), said illumination is provided by a 300 W xenon lamp.

Assignees

• Univ Soochow

Inventors

• Lu Jianmei
• Chen Dongyun
• Jiang Jun

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J37/105

  Hydropyrolysis · CPC title

• B01J37/10

  in the presence of water, e.g. steam · CPC title

• B01D53/007

  by irradiation · CPC title

• B01D2255/70

  Non-metallic catalysts, additives or dopants · CPC title