N-TiO2/BaAl2O4:Eu<2+>,Dy<3+> composite photocatalyst, preparation method and application thereof

A baal2o4, catalyst technology, used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of loss of catalytic activity, short lifespan of photogenerated electrons and photogenerated holes, etc., to achieve improved catalytic activity, The effect of good application prospects

Inactive Publication Date: 2011-10-26
YANTAI UNIV
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 The application of photocatalysts is still limited by two aspects: First, due to the 2 The bandgap of TiO is wide, about 3.2eV, and can only be excited by ultraviolet light with a wavelength less than 389nm, thus broadening the TiO 2 The spectral response range of photocatalysts, so that they still have catalytic activity under visible light irradiation, has become an important issue that needs to be solved urgently; two, TiO 2 After being excited by light, the lifespan of photogenerated electrons and photogenerated holes is very short. Once the two recombine, they lose their catalytic activity.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Prepare 20g containing 2.0Wt% N-TiO2 N-TiO 2 / BaAl 2 o 4 :Eu 2+ , Dy 3+ composite photocatalyst. The preparation method is: accurately weigh 0.4g N-TiO 2 (N-TiO 2 The preparation of the reference literature "N-doped TiO 2 Preparation and Characterization of Photocatalyst" "Applied Chemical Industry" Wang Yuejun, Tang Jianjun, Zhou Kanggen. 2007, 36 (4), that is: tetrabutyl titanate and absolute ethanol were mixed at 1:2 to form A solution; then saturated Mix urea solution and absolute ethanol at a ratio of 1:2 to make solution B. Stir solution B vigorously, use a peristaltic pump to control the dripping speed, slowly drop solution A into solution B, and keep the volume ratio of solution A and solution B at 1:2. The hydrolyzate was dried, ground, roasted at 650°C for 3 hours, and cooled to room temperature for preservation.) and 19.6gBaAl 2 o 4 :Eu 2+ , Dy 3+ (BaAl 2 o 4 :Eu 2+ , Dy 3+ The preparation refers to the literature "Combustion synthesis of lo...

Embodiment 2

[0022] 1. Prepare 20g containing 3.0Wt% N-TiO 2 N-TiO 2 / BaAl 2 o 4 :Eu 2+ , Dy 3+ composite photocatalyst. The preparation methods are as follows: accurately weigh 0.6g N-TiO 2 (preparation method is the same as 1.N-TiO in embodiment one 2 Preparation) and 19.4gBaAl 2 o 4 :Eu 2+ , Dy 3+ (preparation method is the same as 1.BaAl in embodiment one 2 o 4 :Eu 2+ , Dy 3+ preparation), mixed uniformly and ball milled for 2 hours, put into a muffle furnace and baked at 450°C for 3 hours, and cooled to room temperature for storage.

[0023] 2. For comparison, pure TiO was prepared 2 . The preparation method is the same as 2 in Example 1.

[0024] 3. Evaluate the performance of the photocatalyst, the reaction device and the evaluation method are the same as 3 in Example 1.

[0025] Under ultraviolet light irradiation, 20g3.0Wt%N-TiO 2 / BaAl 2 o 4 :Eu 2+ , Dy 3+ The degradation rate of composite photocatalyst to benzene is 39.6% in 5 hours.

[0026] Under UV lig...

Embodiment 3

[0030] 1. Prepare 20g containing 4.0Wt% N-TiO 2 N-TiO 2 / BaAl 2 o 4 :Eu 2+ , Dy 3+ composite photocatalyst. Its preparation method is: accurately weigh 0.8g N-TiO 2 (preparation method is the same as 1.N-TiO in embodiment one 2 Preparation) and 19.2gBaAl 2 o 4 :Eu 2+ , Dy 3+ (preparation method is the same as 1.BaAl in embodiment one 2 o 4 :Eu 2+ , Dy 3+ preparation), mixed uniformly and ball milled for 2 hours, put into a muffle furnace and baked at 450°C for 3 hours, and cooled to room temperature for storage.

[0031] 2. For comparison, pure TiO was prepared 2 . The preparation method is the same as 2 in Example 1.

[0032] 3. Evaluate the performance of the photocatalyst, the reaction device and the evaluation method are the same as 3 in Example 1.

[0033] Under ultraviolet light irradiation, 20g4.0Wt%N-TiO 2 / BaAl 2 o 4 :Eu 2+ , Dy 3+ The degradation rate of composite photocatalyst to benzene is 44.8% in 5 hours.

[0034] Under UV light irradiatio...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a N-TiO2/BaAl2O4:Eu<2+>,Dy<3+> composite photocatalyst, and belongs to the category of catalyst. The N-TiO2/BaAl2O4:Eu<2+>,Dy<3+> composite photocatalyst can be applicable for acatalytic conversions of vapor organic contaminants. Compared to pure TiO2, the N-TiO2/BaAl2O4:Eu<2+>,Dy<3+> composite photocatalys has substantially improved catalytic activity and has response ability to visible light. Because partial photo generated holes generated from the BaAl2O4:Eu<2+>,Dy<3+> migrate to a valence band of the N-TiO2 under illumination, photogenerated electrons of a conduction band of the N-TiO2 are captured through trapping level formed through a lattice defect of the BaAl2O4:Eu<2+>,Dy<3+>, such that the photogenerated electrons of the N-TiO2 is separated from the photo generated holes of the N-TiO2, recombination rate is reduced, and the catalytic activity is raised. In addition, in the N-TiO2, because a localized state of an N2p orbital is formed above the valence band of the TiO2, width of a forbidden band of the TiO2 is narrow, a absorption edge of the TiO2 has a redshift, and a spectral response range of the TiO2 is developed to the visible region.

Description

Technical field: [0001] The invention belongs to the category of catalysts, in particular to a composite photocatalyst N-TiO 2 / BaAl 2 o 4 :Eu 2+ , Dy 3+ preparation and its application in photocatalysis. Background technique: [0002] With the increasingly prominent environmental pollution, the air quality problem has attracted more and more people's attention. The 1990 U.S. Clean Air Act amendment listed 189 toxic and harmful gases, most of which are volatile organic pollutants in the air. In the past few decades, people have focused their attention on the air pollution and control of the external environment. In the past ten years, people have only realized the hygienic significance of indoor air. Europe, North America, Japan and other countries have started research work on indoor environmental quality since the 1980s, and my country has also formulated a series of "Indoor Air Quality Standards" at the end of the last century, as a basis for evaluating indoor air q...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/04A62D3/10
Inventor 李硕陈耀强王健礼
Owner YANTAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap