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Process for preparing visible light responding photo catalytic film layer

A visible light, thin film layer technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex production process, slow overall reaction rate, and high raw material requirements, and achieve a simple preparation technology process. , Reduce the processing time, the surface is dense and smooth

Inactive Publication Date: 2005-10-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently chemically stable titanium dioxide (TiO 2 ) is the main research object, and its wide industrial application is greatly restricted. The main problems include: (1), the quantum yield is low, the overall reaction rate is slow, and it is difficult to treat industrial waste gas and wastewater with large volume and high concentration; (2), low utilization rate of solar energy, due to TiO 2 The energy band structure determines that it can only absorb the ultraviolet part of sunlight and cannot absorb visible light.
These methods need more expensive equipment, the production process is complicated, the scale and output of processing are limited, the requirements for raw materials are high, and the price is high. First, the high-temperature solid-phase method must be used to synthesize bismuth vanadate powder. In addition, such as sol-gel method, organic The metal salt decomposition method also requires a subsequent heat treatment process, which increases production costs
More importantly, these methods cannot handle loaded objects with large volume or surface, such as doors, window glass, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A layer of bismuth vanadate photocatalyst thin film layer is prepared on the glass sheet. A certain amount of bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O and EDTA, dissolved in distilled water, and then added to sodium hydrogen phosphate NaH with a concentration of 0.1mol / L 2 PO 4 , Disodium hydrogen phosphate Na 2 HPO 4 buffer solution, as A solution; then sodium vanadate NaVO 3 Added to sodium hydrogen phosphate NaH with a concentration of 0.1mol / L 2 PO 4 , Disodium hydrogen phosphate Na 2 HPO 4 Buffer solution, as B liquid; Control adding speed, B liquid is joined in A liquid, is controlled at bismuth nitrate: ethylenediaminetetraacetic acid: sodium vanadate is 1: 2~3: 2~3 (molar ratio), uses The NaOH aqueous solution with a concentration of 1 mol / L adjusts the pH of the solution to about 7. During the stirring process, the aqueous solution is heated to obtain a clear solution with a certain concentration, which is used as liquid C. Then put the glass piece that ...

Embodiment 2

[0031] Preparation of bismuth vanadate photocatalyst film layer doped with rare earth or metal ions. A certain amount of bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O, cerium nitrate Ce(NO 3 ) 3 ·6H 2 O and EDTA, first dissolve EDTA in distilled water, then add Bi(NO 3 ) 3 ·5H 2 O, cerium nitrate Ce(NO 3 ) 3 ·6H 2 O, followed by adding sodium hydrogen phosphate NaH with a concentration of 0.1mol / L 2 PO 4 , Disodium hydrogen phosphate Na 2 HPO 4 buffer solution, as A solution; then sodium vanadate NaVO 3 Added to sodium hydrogen phosphate NaH with a concentration of 0.1mol / L 2 PO 4 , Disodium hydrogen phosphate Na 2 HPO 4 Buffer solution, as B liquid; control adding speed, B liquid is joined in A liquid, control in (bismuth nitrate+cerium nitrate): citric acid: sodium vanadate is 1: 1.5~3: 1.5~3, with the concentration of 1 mol / L NaOH aqueous solution to adjust the pH of the solution to about 6.5-8. During the stirring process, the aqueous solution is heated to obtain...

Embodiment 3

[0035] Preparation of nano zinc oxide coated with bismuth vanadate photocatalyst thin film layer. The preparation of solution is as embodiment 1, promptly takes a certain amount of bismuth nitrate Bi (NO 3 ) 3 ·5H 2 O and EDTA, dissolved in distilled water, and then added to sodium hydrogen phosphate NaH with a concentration of 0.1mol / L 2 PO 4 , Disodium hydrogen phosphate Na 2 HPO 4 buffer solution, as A solution; then sodium vanadate NaVO 3 Added to sodium hydrogen phosphate NaH with a concentration of 0.1mol / L 2 PO4 , Disodium hydrogen phosphate Na 2 HPO 4 Buffer solution, as B liquid; Control adding speed, B liquid is joined in A liquid, control in bismuth nitrate: ethylenediaminetetraacetic acid: sodium vanadate is 1: 2~3: 2~3, and concentration is 1mol / 1 L of NaOH aqueous solution to adjust the pH of the solution to about 7. Then add a certain amount of zinc oxide powder with an average particle size of 60 nanometers into the solution, place it in an ultrasoni...

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PUM

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Abstract

The preparation process of visible light responding photocatalytic film layer features that the core or substrate to be coated is set inside water solution with water soluble inorganic or organic Bi compound and V compound, additive, complexing agent, NaOH, KOH and HNO3 while ultrasonically stirring, and after processing for 1-360 min, the core or substrate with obtained visible light responding photocatalytic bismuth vanadate film layer in the surface is taken out and washed with water or organic solvent. Thus obtained material with loaded bismuth vanadate photocatalyst has powerful sterilizing, deterging and deodorizing functions.

Description

technical field [0001] The invention relates to a preparation technology of a visible light-responsive photocatalytic thin film layer, in particular to a simple preparation technology for loading a bismuth vanadate photocatalyst thin film on various materials. Background technique [0002] Bismuth vanadate is a new type of non-toxic yellow pigment, and it is also a photocatalyst with excellent performance and high visible light response activity. [0003] The use of photocatalytic technology to purify the environment is a "green technology", which has attracted widespread attention from governments and has become a research hotspot in the academic and industrial circles of various countries. Photocatalysts can effectively remove harmful substances in the air and sterilize them under the irradiation of ultraviolet or visible light, and directly oxidize and decompose VOCs (formaldehyde, benzene series, sulfide, nitrogen oxides and other pollutant...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J37/02
Inventor 李敦钫祝梅邹志刚
Owner NANJING UNIV
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