Method for preparing B-doped g-C3N4 photocatalyst through nonmetal liquid-phase doping

A photocatalyst, g-c3n4 technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of limited activity and high recombination rate, and achieve novel Tissue structure morphology, the effect of high application prospects

Inactive Publication Date: 2015-04-29
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the monomer g-C 3 N 4 The high recombination rate of electron-hole pairs leads to the limitation of its activity, so it has become a research hotspot to improve the photocatalytic activity by modifying the photocatalyst.

Method used

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  • Method for preparing B-doped g-C3N4 photocatalyst through nonmetal liquid-phase doping
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  • Method for preparing B-doped g-C3N4 photocatalyst through nonmetal liquid-phase doping

Examples

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Embodiment 1

[0028] Accurately weigh 2g of g-C 3 N 4 Place in 200ml of distilled water and ultrasonically for 0.5h, then continue stirring for 12h to make it fully mixed to obtain g-C 3 N 4 suspension. Accurately weigh 0.2g of PEI and add to the above g-C 3 N 4 In the suspension, stir for 1 hour, centrifuge and pour the supernatant, add a certain amount of water to 200ml, and stir well to obtain the CNP solution. Take 20ml of CNP solution, drop 20ml of prepared 1mg / ml sodium tetraphenylborate solution dropwise into the above-mentioned solution, centrifuge after stirring for 1h, and dry the obtained solid at 60°C for 8 hours to obtain Precursor. Grind the dried precursor evenly, place it in a crucible, and then place it in a muffle furnace for calcination in an air atmosphere. The calcination temperature is 500°C, and the heating rate is 5°C / min. After 4 hours of heat preservation, it is naturally cooled, and the obtained powder is g-C modified by doping for non-metallic liquid phase...

Embodiment 2

[0030] Accurately weigh 2g of g-C 3 N 4 Place in 200ml of distilled water for 1 hour, then continue to stir for 12 hours to make it fully mixed to obtain g-C 3 N 4 suspension. Accurately weigh 0.2g of PEI and add to the above g-C 3 N 4 In the suspension, stir for 2 hours, centrifuge and pour the supernatant, add a certain amount of water to 200ml, and stir well to obtain the CNP solution. Take 20ml of CNP solution, drop 50ml of prepared 1mg / ml sodium tetraphenylborate solution dropwise into the above-mentioned solution, centrifuge after stirring for 2h, and dry the obtained solid at 60°C for 12 hours to obtain Precursor. Grind the dried precursor evenly, place it in a crucible, and then place it in a muffle furnace for calcination in an air atmosphere. The calcination temperature is 520°C, and the heating rate is 1°C / min. After 4 hours of heat preservation, it is naturally cooled to obtain a powder That is, non-metallic liquid phase B doped modified g-C 3 N 4 The phot...

Embodiment 3

[0032] Accurately weigh 2g of g-C 3 N 4 Place in 200ml of distilled water for 2 hours, then continue to stir for 24 hours to make it fully mixed to obtain g-C 3 N 4 suspension. Accurately weigh 0.2g of PEI and add to the above g-C 3 N 4 In the suspension, stir for 3h, centrifuge and pour a certain amount of water to 200ml after pouring the supernatant, and fully stir to obtain the CNP solution. Take 20ml of CNP solution, drop 70ml of prepared 1mg / ml sodium tetraphenylborate solution dropwise into the above-mentioned solution, centrifuge after stirring for 2h, and dry the obtained solid at 80°C for 8 hours to obtain Precursor. Grind the dried precursor evenly, place it in a crucible, and then place it in a muffle furnace for calcination in an air atmosphere. The calcination temperature is 500°C, and the heating rate is 1°C / min. After 4 hours of heat preservation, it is naturally cooled to obtain a powder That is, non-metallic liquid phase B doped modified g-C 3 N 4 The...

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Abstract

The invention discloses a method for preparing a B-doped g-C3N4 photocatalyst through nonmetal liquid-phase doping, and belongs to the technical field of hydrogen production through photocatalytic materials. According to the prepared organic polymer semiconductor material g-C3N4 photocatalyst, cheap chemical material urea is taken as a reactant source, sodium tetraphenylborate is taken as a doping source, PEI (polyethyleneimine) is taken as a surface charge modifier, and the B-doped g-C3N4 photocatalyst is successively prepared with a pyrolysis and polymerization method easy to operate. The nonmetal liquid-phase doping modified g-C3N4 photocatalyst has novel organization structure appearance, good response of visible light with wavelength larger than 420 nm and good photocatalytic hydrogen generation property, and promotes solar energy conversion into new energy under the photocatalysis action at a low cost; the provided preparation method has the advantages of cheap raw materials, simple and convenient technology and the like and has an important research value and a wide industrialized application prospect.

Description

technical field [0001] The invention relates to the field of photocatalysis, a kind of non-metallic liquid phase doping to prepare B-doped g-C 3 N 4 The photocatalyst method belongs to the technical field of photocatalytic material hydrogen production. Background technique [0002] Hydrogen energy will become a pivotal energy source in the energy arena of the 21st century and will be valued by all countries. Utilizing hydrogen energy is an effective way to solve our country's energy problems and challenges, and it is also an important guarantee for our country's sustainable development. It has a bright future in China. However, hydrogen is a secondary energy source. At present, there are many methods for preparing hydrogen, and hydrogen production through solar photolysis of water is an effective method that is both environmentally friendly and economical. [0003] In today's energy shortage and increasingly serious environmental pollution, the development of hydrogen ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06C01B3/04
CPCY02E60/36Y02P20/133
Inventor 李永利张燕王金淑杨亦龙何迪
Owner BEIJING UNIV OF TECH
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