Red light or infrared light catalytic material comprising semiconductor material and up-conversion material

A technology for conversion materials and catalytic materials, which is applied in the field of new red light or infrared photocatalytic materials, and can solve the problems that light energy cannot be effectively used

Inactive Publication Date: 2010-02-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These works are of great significance, but it is undeniable that these improved titanium dioxide materials can only use the shorter wavelength region of visible light, and the light energy in the red region and near-infrared region, which account for the main components of the solar spectrum, cannot be effectively utilized. The limitation of the photocatalytic technology has become a bottleneck in the application

Method used

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  • Red light or infrared light catalytic material comprising semiconductor material and up-conversion material
  • Red light or infrared light catalytic material comprising semiconductor material and up-conversion material
  • Red light or infrared light catalytic material comprising semiconductor material and up-conversion material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Er-doped Y 3 al 5 o 12 Upconversion materials and TiO 2 Red light photocatalytic material mixed with semiconductor materials

[0026] 1. Sample Preparation Process

[0027] 1) Preparation of Er-doped Y by sol-gel method 3 al 5 o 12 Nanoparticles. According to molar ratio 0.05Er 3+ : 2.95Y 3+ : 5.00Al 3+ Weigh 0.019g of Er 2 o 3 , 0.666g of Y 2 o 3 and 0.510g of Al 2 o 3 Dissolve together in 20mL of nitric acid with a concentration of 10%, put the solution on an electric stove and heat to evaporate excess water and nitric acid to obtain 2.2g of nitrate mixture; then dissolve the obtained nitrate mixture in 20ml of deionized water, and then add Add 2ml of ethylene glycol and 2ml of acetic acid, stir the resulting solution for 10h to form a transparent jelly, dry the gel at 100°C to obtain a white powder, and then anneal the obtained white powder at 600°C for 2 hours That is to get 1g up-conversion material Y 2.95 Er 0.05 al 5 o 12 , where t...

Embodiment 2

[0036] Example 2: Er-doped Y 3 al 5 o 12 up-conversion material and V 2 o 5 Red light photocatalytic material mixed with semiconductor materials

[0037] 1. Sample Preparation Process

[0038] 1) Er-doped Y 3 al 5 o 12 The preparation is the same as in Example 1.

[0039] 2) take ammonium vanadate as raw material to prepare V 2 o 5 , Dissolve 0.5g of ammonium vanadate in 60ml of deionized water, then put the solution in a drying oven and dry at 120°C for 12h, and then sinter the dried product at 450°C for 4h in an air atmosphere to obtain 0.6g of V 2 o 5 , place 0.45g of V 2 o 5 with 0.05g Y 2.95 Er 0.05 al 5 o 12 After mixing and grinding, a red-light photocatalytic material is obtained, wherein V 2 o 5 The quality score is 90%.

[0040] 2. Carry out the red light photocatalytic activity test, the test process is the same as that of Example 1.2, and the experimental results are shown in the table below.

[0041] Table 3: Data on the degradation of methyle...

Embodiment 3

[0046] Example 3: YF co-doped with Yb and Tm 3 Upconversion materials and TiO 2 Hybrid Core-Shell Structured Infrared Photocatalytic Materials

[0047] 1. Sample Preparation Process

[0048] 1) Synthesis of Yb and Tm co-doped YF by hydrothermal method 3 . Weigh Y according to molar ratio 0.795Y: 0.2Yb: 0.005Tm 2 o 3 0.09g, Yb 2 o 3 0.394g and Tm 2 o 3 Dissolve 0.01g together in 20mL, 7% dilute hydrochloric acid, heat to dissolve, continue heating to evaporate excess solvent until white Y is obtained 0.795 Yb 0.2 T m 0.005 Cl 3 powder, dissolve the obtained chloride in 20ml of deionized water, then add 3ml of hydrofluoric acid, stir for 1 hour, then transfer the sample to a hydrothermal reaction kettle, keep it at 130°C for 12 hours, cool to room temperature, and then centrifugally clean the sample , placed in a vacuum drying oven at 60°C for 6 hours, and finally placed in a tube furnace and annealed at 600°C for 6 hours under an argon protective atmosphere to obta...

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Abstract

The invention belongs to the field of photocatalytic materials, in particular relates to a novel red light or infrared light catalytic material which comprises an up-conversion material and a semiconductor material. In the invention, a semiconductor photocatalytic material and a red light/infrared-ultraviolet up-conversion luminescent material are combined, and the up-conversion material is used for absorbing red light/infrared light and emitting ultraviolet light, thereby activating the semiconductor photocatalytic material and realizing the infrared light catalysis. By modifying and improving the semiconductor in the composite material, the photocatalytic activity of the material can be further improved. The invention expands the wavelength range of the excitationlight required by photocatalytic reaction, breaks the limit that the photocatalytic reaction can be activated only by ultraviolet light and shortwave visible light, improves the utilization ratio of sun light in the photocatalytic reaction, and can be widely applied to the photocatalytic degradation of organic pollutants in water by using red light, infrared light and sun light.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and in particular relates to a novel red light or infrared photocatalytic material composed of an up-conversion material and a semiconductor material. Background technique [0002] With the development of industry and the increasingly prominent environmental problems, countries all over the world have carried out extensive research on semiconductor photocatalytic degradation of inorganic and organic pollutants. Titanium dioxide (TiO 2 ) The photocatalytic performance of a series of semiconductor materials represented by ) has been deeply and extensively studied. Among them, titanium dioxide has the advantages of high photocatalytic activity, good stability, and low cost, and has become a research hotspot in the field of photocatalysis, and can be widely used in sewage treatment and air purification. Most of the semiconductor materials used for photocatalysis are wide-bandgap semiconductor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06B01J23/22B01J27/135B01J27/24B01J27/138B01J27/132C02F1/30C02F101/30
CPCY02W10/37
Inventor 秦伟平张代生薛笑杰赵丹郑克志王丽丽姜涛
Owner JILIN UNIV
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