High-performance micro-nano multi-level structure BiOCl photocatalytic material and preparation method thereof

A photocatalytic material and high-performance technology, applied in the field of nanomaterials and photocatalysis, can solve problems such as difficult recycling, achieve the effects of overcoming difficult recycling, inhibiting hydrolysis, and improving light absorption

Active Publication Date: 2014-01-29
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

By introducing a non-toxic and biodegradable surfactant polyvinyl alcohol, the BiOCl nanosheets self-assembled into flower-like microspheres with a micro-nano multi-level structure, which can not only meet the requirements of environmental friendli

Method used

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  • High-performance micro-nano multi-level structure BiOCl photocatalytic material and preparation method thereof
  • High-performance micro-nano multi-level structure BiOCl photocatalytic material and preparation method thereof
  • High-performance micro-nano multi-level structure BiOCl photocatalytic material and preparation method thereof

Examples

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[0026] Example 1

[0027] Take Bi(NO 3 ) 3 .5H 2 O is used as the bismuth source, NaCl is used as the chlorine source, and the biodegradable surfactant polyvinyl alcohol (PVA) is introduced to synthesize high-performance micro-nano hierarchical structure BiOCl photocatalytic material in one step.

[0028] Mix 2ml of concentrated HNO with 65% mass fraction 3 Dissolve in 20ml of water to prepare 1.3mol / L HNO 3 Solution, HNO 3 The solution concentration ≥1.3mol / L can ensure the follow-up Bi(NO 3 ) 3 .5H 2 No hydrolysis occurs when O is dissolved.

[0029] Quickly weigh 8mmol Bi(NO 3 ) 3 .5H 2 O, and dissolve it in the above-configured 1.3mol / L HNO 3 In the solution, it is fully dissolved under the condition of magnetic stirring and formulated into Bi(NO 3 ) 3 -HNO 3 mixture.

[0030] Under the conditions of ultrasonic dispersion and mechanical stirring, add 20ml of NaCl aqueous solution (8mmol) and 5ml of pre-configured polyvinyl alcohol aqueous solution with a mass percentage of 5% at th...

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Abstract

The invention relates to the field of nanomaterials and photocatalytic technologies and specifically relates to a high-performance micro-nano multi-level structure BiOCl photocatalytic material and a preparation method thereof. According to the preparation method provided by the invention, polyvinyl alcohol which is a non-toxic and biodegradable surfactant is introduced, so that BiOCl nano-sheets generated by reaction are self-assembled into micro-nano multi-level structure flower-like microspheres, wherein the diameter of the flower-like microspheres is 2-3 mu m, the length of the nano-sheets is 100-300nm, the width of the nano-sheets is 100-300nm, the thickness of the nano-sheets is 10-50nm, the nano-sheets are mutually overlapped to form a large number of pore structures with the aperture of 50-200nm, and the specific surface area is not less than 46.9m<2>/g. The BiOCl photocatalytic material not only can take the high catalytic activity and efficiency advantage of nano-units, but also can effectively overcome the defects that a nano-photocatalyst is difficult to recover and easily produces secondary pollution in use. The preparation method can be completed in one step at room temperature, has the advantages of simple process, low energy consumption, low cost, short preparation period and environmental friendliness, and is conductive to engineering large-scale preparation and application.

Description

technical field [0001] The invention relates to the technical field of nanometer materials and photocatalysis, in particular to a high-performance micro-nano multi-level structure BiOCl photocatalyst material and a preparation method thereof. Background technique [0002] Photocatalysis, which uses solar radiation to treat pollutants emitted by human activities, provides a new and promising way for the purification of pollutants. Stable, cheap and high-performance semiconductor photocatalytic materials are the core of photocatalytic technology. Among the currently developed photocatalytic materials, TiO 2 With its stable chemical properties, low energy consumption, wide application range, non-toxicity, high catalytic activity, strong oxidation ability and other advantages, it has become the most typical semiconductor material for photocatalysis. However, the low quantum efficiency and wide bandgap limit TiO 2 Practical applications in the field of photocatalytic technolog...

Claims

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Application Information

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IPC IPC(8): B01J27/06
Inventor 刘家琴吴玉程阮丽丽胡家佳
Owner HEFEI UNIV OF TECH
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