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A method for preparing tantalum-based perovskite oxynitride photocatalyst

A technology of nitrogen oxides and photocatalysts, applied in the field of photocatalytic materials, can solve the problems of low efficiency of solar hydrogen production efficiency, organic pollutants, poor stability, and low sunlight absorption rate, so as to enhance the ability of coating and fixation, improve the effective The effect of separation ability

Active Publication Date: 2021-06-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, common photocatalysts such as TiO 2 (a photocatalytic degradation of formaldehyde film, patent number: CN 106390740A), CdS (The Journal of Physical Chemistry C, 115 (2011) 11466-11473), etc., because it can only absorb ultraviolet light and cause low sunlight absorption rate or Poor stability, harmful to the environment and other problems lead to low efficiency of solar hydrogen production and degradation of organic pollutants (such as formaldehyde), so they are not ideal photocatalysts

Method used

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  • A method for preparing tantalum-based perovskite oxynitride photocatalyst
  • A method for preparing tantalum-based perovskite oxynitride photocatalyst
  • A method for preparing tantalum-based perovskite oxynitride photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] Preparation and use of water splitting hydrogen production photocatalyst:

[0029] The sample powder P1, cobalt nitrate, and deionized water were mixed, and the suspension M1 was obtained by ultrasonic; Burn for 1-3 hours, continue to burn for 1-3 hours under the condition of 423K-473K under the air atmosphere, and obtain powder P2; mix the powder P2 with chloroplatinic acid solution, and burn for 1-3 hours under the condition of 400K-500K, Obtain water splitting hydrogen production type photocatalyst;

[0030] Select a piece of clean FTO conductive glass (10 cm × 10 cm), mix water decomposition hydrogen production photocatalyst, polyvinylpyrrolidone (PVP, molecular weight 1300000), deionized water according to the weight ratio of 20:1:10, grind, Scratch coating on FTO conductive glass; FTO conductive glass and platinum sheet (1 cm × 1 cm) loaded with water splitting hydrogen production photocatalyst are used as working electrode and counter electrode respectively, and...

Embodiment 1-4

[0035] Preparation of perovskite metal oxynitride LaTa according to different La / Zr ratios in Table 1 1-x Zr x o 1+y N 2-y and performance testing

[0036] Table 1

[0037] Reagent name Example 1 Example 2 Example 3 Example 4 x 0.05 0.10 0.15 0.20 Zirconium acetate 2.01 4.03 6.06 8.09 Lanthanum nitrate hexahydrate 53.20 53.30 53.41 53.51 Tantalum pentachloride 41.79 39.67 37.53 35.40 Chloroplatinic acid 1.00 1.00 1.00 1.00 cobalt nitrate 2.00 2.00 2.00 2.00 Silver nitrate 0.00 0.00 0.00 0.00 Laccase 0.00 0.00 0.00 0.00

[0038] Table 2 prepares LaTa for different La / Zr ratios 1-x Zr x o 1+y N 2-y In Examples 1-4, the performance of photolysis of water under the condition of AM 1.5G and the detection of formaldehyde removal performance according to GB / T16129.

[0039] Table 2

[0040]

[0041] figure 1 LaTa is prepared for x=0 and Examples 1-3 1-x Zr x o 1+y N 2-y (0

Embodiment 5-9 and comparative example 1

[0043] The performance test of solar photocatalytic hydrogen production and formaldehyde degradation of different components of photocatalysts, the composition of the components is shown in Table 3.

[0044] table 3

[0045] Reagent name Example 5 Example 6 Example 7 Example 8 Example 9 Example 9 Comparative example 1 x 0.10 0.10 0.10 0.10 0.10 0.10 0.10 Zirconium acetate 4.03 4.03 4.03 4.03 4.03 4.03 4.03 Lanthanum nitrate hexahydrate 53.30 53.30 53.30 53.30 53.30 53.30 53.30 Tantalum pentachloride 39.67 39.67 39.67 39.67 39.67 39.67 39.67 Chloroplatinic acid 2.00 3.00 1.00 2.00 2.00 2.00 0.00 cobalt nitrate 4.00 6.00 0.00 4.00 4.00 4.00 0.00 Silver nitrate 0.00 0.00 2.00 0.00 0.00 0.00 0.00 Laccase 0.00 0.00 0.00 1.00 5.00 10.00 0.00

[0046] Table 4 Different La / Zr ratios prepare LaTa 1-x Zr x o 1+y N 2-y In Examples 5-9 and Comparative Example 1, th...

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Abstract

The invention relates to a method for preparing a tantalum-based perovskite oxynitride photocatalyst, which uses a perovskite-type metal oxynitride LaTa 1‑x Zr x o 1+y N 2‑y Based on cobalt oxide, nano-platinum or nano-silver catalyst, and a laccase carrier to form a photocatalyst preparation, wherein 0<x≤0.15, 0≤y≤1. Compared with the prior art, the present invention can fully split water under sunlight to produce hydrogen and efficiently remove formaldehyde indoors.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a method for preparing a tantalum-based perovskite nitrogen oxide photocatalyst. Background technique [0002] With the continuous development of society, the energy crisis and the environmental problems caused by the burning of fossil fuels are becoming more and more serious, and the existing energy structure has become increasingly difficult to meet the rapid economic development. Therefore, it is particularly important to develop and find a new sustainable green energy. At present, wind energy, solar energy, tidal energy, and geothermal energy have all received widespread attention because of their cleanness and pollution-free nature. [0003] As we all know, the solar energy reserves are huge. It is estimated that the sun will continue to burn for 5 billion years, and the solar energy reaching the earth's surface in one hour can meet the energy needs of huma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J31/28C25B1/04C25B11/091B01D53/86B01D53/72
CPCB01D53/8668C25B1/04C25B11/04B01J27/24B01J31/003B01J31/28B01J35/39Y02E60/36
Inventor 徐晓翔汪亚威喻金星
Owner TONGJI UNIV
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