Ag doped BiOBr catalytic material and preparation method and application thereof

A catalytic material and composite photocatalytic technology, applied in Ag-doped BiOBr catalytic material and its preparation and application field, can solve the problems of limited visible light response, unstable doping system, limited red shift degree, etc., and achieve strong visible light response performance effect

Inactive Publication Date: 2010-10-06
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal deposition/metal doping can be done on TiO 2 The conduction band position produces deep or shallow impurity levels, which make the wide bandgap semiconductor produce a certain response in the visible light range. The disadvantages are that the visible light response is limited and the doping system is unstable. At the same time, the doped metal ions often become photogenerated electrons and The recombination center of holes leads to low quantum yield; anion doping (B, C, S, F, N, etc.) will form a hybrid with the original valence band, expand its valence band, thereby raising the top of the valence band and shortening the quantum yield. The band gap leads to the emergence of visible light response. The problem it face

Method used

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  • Ag doped BiOBr catalytic material and preparation method and application thereof
  • Ag doped BiOBr catalytic material and preparation method and application thereof
  • Ag doped BiOBr catalytic material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 0.01 mole Bi(NO 3 ) 3 ·5H 2 O, stirring to obtain solution A, adding 0.01 mole of NaBr and 0.02 mole of sodium acetate in 7 milliliters of deionized water to obtain solution B. Under vigorous stirring, solution A and solution B were rapidly mixed, stirred with a magnetic stirrer for 12 hours, filtered, washed with deionized water, and dried at 100° C. for 12 hours to obtain the BiOBr compound. Disperse 1 gram of BiOBr compound in 40 milliliters of deionized water, add 7.9 milligrams of silver nitrate and 4 milliliters of methanol at the same time, pass high-purity helium with a flow rate of 5 milliliters / min into the suspension, and while stirring, irradiate with 365 nm ultraviolet light for 4 hours, filtered, and the solid product obtained by filtering was rinsed three times with distilled water and ethanol respectively, and then dried at 100°C for 12 hours to obtain the corresponding Ag(0.5%) / BiOBr composite photocatalytic material, its characteristics and degra...

Embodiment 2

[0040] Add 0.01 mole Bi(NO 3 ) 3 ·5H 2 O, stirring to obtain solution A, adding 0.01 mole of NaBr and 0.02 mole of sodium acetate in 7 milliliters of deionized water to obtain solution B. Under vigorous stirring, solution A and solution B were rapidly mixed, stirred with a magnetic stirrer for 12 hours, filtered, washed with deionized water, and dried at 90° C. for 12 hours to obtain the BiOBr compound. Disperse 1 gram of BiOBr compound in 40 milliliters of deionized water, add 16 milligrams of silver nitrate and 4 milliliters of methanol at the same time, pass high-purity helium into the suspension at a flow rate of 10 milliliters per minute, and irradiate it with 365 nm ultraviolet light for 4 hours while stirring , filtered, and the filtered solid product was rinsed with distilled water and ethanol three times respectively, and then dried at 100°C for 12 hours to obtain the corresponding Ag(1%) / BiOBr composite photocatalytic material, its characteristics and degradation r...

Embodiment 3

[0042] Add 0.01 M BiNO to 7 mL of glacial acetic acid 3 ·5H 2 O, stirring to obtain solution A, adding 0.01 mole of NaBr and 0.02 mole of sodium acetate in 7 milliliters of deionized water to obtain solution B. Under vigorous stirring, solution A and solution B were rapidly mixed, stirred with a magnetic stirrer for 12 hours, filtered, washed with deionized water, and dried at 110°C to obtain the BiOBr compound. Disperse 1 gram of BiOBr compound in 40 milliliters of deionized water, add 32.5 milligrams of silver nitrate and 4 milliliters of methanol at the same time, pass high-purity helium into the suspension at a flow rate of 15 milliliters per minute, and irradiate it with 365 nm ultraviolet rays for 4 hours while stirring , filtered, and the filtered solid product was rinsed three times with distilled water and ethanol respectively, and then dried at 100°C for 12 hours to obtain the corresponding Ag(2%) / BiOBr composite photocatalytic material, its characteristics and degr...

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Abstract

The invention relates to an Ag/BiOBr composite photocatalytic material and a preparation method and application thereof, belongs to the field of photocatalytic materials. The invention uses a low-temperature soft chemical method, compounds a novel semiconductor BiOBr and silver nanoparticles to prepare the Ag/BiOBr composite photocatalyst material. The unique interaction between Ag and BiOBr enhances the absorption properties of the catalyst to visible light and speeds up the transport process of photon-generated carriers, reduces the recombination probability of electron-hole pair, and improves the quantum efficiency of visible photocatalysis. Under visible light, the composite catalytic material has extremely high degradation performance of organic dyes. The invention has simple preparation process, mild conditions, low cost and good prospects for industrial application.

Description

technical field [0001] The invention relates to a silver-doped bismuth-oxygen-bromine composite photocatalytic material and a preparation method and application thereof, belonging to the field of photocatalytic materials. The catalytic material can efficiently photocatalyze and degrade organic dyes under visible light irradiation. Background technique [0002] Photocatalytic technology is one of the main ways to solve environmental and energy problems in the future. The use of photocatalysis can convert low-density solar light energy into high-density chemical energy and electrical energy, such as photolysis of water to produce hydrogen and photoelectric conversion, which is expected to completely solve the crisis of human beings facing the depletion of fossil energy; Mineralize various pollutants in water and air, and can also carry out antibacterial deodorization and treat Hg in wastewater 2+ 、Ag + 、Cr 6+ This will be one of the effective ways for human society to compl...

Claims

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Application Information

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IPC IPC(8): B01J27/08C02F1/32
CPCY02W10/37
Inventor 余长林
Owner JIANGXI UNIV OF SCI & TECH
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