BiOI/TiO2 heterojunction type photocatalytic material and low-temperature preparation method thereof

A photocatalytic material and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as application limitations, achieve enhanced response, good industrial application prospects, and low cost Effect

Inactive Publication Date: 2010-01-06
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 The bandgap energy of solar energy is 3.2eV, and only ultraviolet light with a wavelength of less than 387nm can excite it to generate electron-hole pairs; Visible light accounts for 43%, so its practical application is limited

Method used

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  • BiOI/TiO2 heterojunction type photocatalytic material and low-temperature preparation method thereof
  • BiOI/TiO2 heterojunction type photocatalytic material and low-temperature preparation method thereof
  • BiOI/TiO2 heterojunction type photocatalytic material and low-temperature preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add tetraisopropanol titanate into 5 mL of ethanol at room temperature, stir to dissolve, and its concentration is 0.01 mol / L. Add bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O, make the Bi / Ti molar concentration ratio in the solution 0.1. Add this solution dropwise to 90mL distilled water, add and Bi(NO 3 ) 3 ·5H 2 O equimolar amount of KI; continue to stir for 0.5 hours and heat the resulting mixture in a water bath at 60°C for 3 hours; after the reaction is completed, wash the resulting product with water and ethanol three times, and dry to obtain a BiOI-containing heterojunction photocatalytic material. BiOI and TiO 2 The molar ratio is 0.2:1.

Embodiment 2

[0028] Add tetraisopropanol titanate into 5 mL of ethanol at room temperature, stir to dissolve, and its concentration is 0.05 mol / L. Add bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O, make the Bi / Ti molar ratio in the solution be 0.8; Add this solution dropwise to 90mL distilled water, add and Bi(NO 3 ) 3 ·5H 2 O equimolar amount of KI; continue to stir for 0.5 hours and heat the resulting mixture in a water bath at 90°C for 6 hours; after the reaction is completed, wash the resulting product with water and ethanol three times, and dry to obtain a BiOI-containing heterojunction photocatalytic material. BiOI and TiO 2 The molar ratio is 0.8:1.

Embodiment 3

[0030] Add tetraisopropanol titanate into 5 mL of ethanol at room temperature, stir to dissolve, and its concentration is 0.1 mol / L. Add bismuth nitrate Bi(NO 3 ) 3 ·5H 2O, make the Bi / Ti molar concentration ratio in the solution be 0.5; add this solution dropwise to 90mL distilled water, add and Bi(NO 3 ) 3 ·5H 2 O equimolar amount of KI; after continuing to stir for 0.5 hours, the resulting mixture was heated in a water bath at 90°C for 5 hours; after the reaction was completed, the resulting product was washed with water and ethanol three times, and dried to obtain a BiOI-containing heterojunction photocatalytic material. BiOI and TiO 2 The molar ratio is 0.5:1.

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PUM

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Abstract

The invention relates to a BiOI/TiO2 heterojunction type photocatalytic material and a preparation method thereof, which belong to the field of photocatalytic materials. A novel narrow band-gap semiconductor BiOI and a broad band-gap semiconductor TiO2 are compounded by a low-temperature soft chemical method to prepare the heterojunction type photocatalytic material; the formation of heterojunction accelerates the transport process of photo-generated carriers, decreases the recombination probability of an electron-hole pair and improves the photocatalytic quantum efficiency, and the heterojunction has good catalytic and degradation performance of organic substances. The heterojunction type photocatalytic material has simple preparation technology, mild conditions, low cost and good industrialized application prospects.

Description

technical field [0001] The present invention relates to a kind of BiOI / TiO 2 The invention relates to a heterojunction photocatalytic material and a preparation method thereof, belonging to the field of photocatalytic materials and the preparation thereof. Background technique [0002] At present, research on photocatalytic reactions in environmental governance and energy development is very active. Photocatalytic reaction refers to the irradiation of photocatalysts, such as TiO 2 , ZnO, CdS, WO 3 , SnO 2 , Fe 2 o 3 etc., so that the electrons on the valence band are excited to jump to the conduction band, and photogenerated hole-electron pairs with strong oxidation ability are formed on the valence band and the conduction band, so as to oxidize and degrade organic pollutants, or convert H 2 O decomposes into H 2 and O 2 . Among them, TiO 2 It has become the most widely studied single oxide catalyst due to its moderate band gap, stable chemical properties, no toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135A62D3/17A62D101/20
Inventor 张礼知张喜
Owner HUAZHONG NORMAL UNIV
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