Preparation method and application of nano zinc oxide photocatalyst

A nano-zinc oxide, photocatalyst technology, applied in the direction of zinc oxide/zinc hydroxide, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of difficult to remove moisture, expensive raw materials, Long reaction time and other problems, to achieve the effect of ensuring safety and environmental protection, mild and easily controllable reaction conditions, high purity and crystallinity

Inactive Publication Date: 2016-07-27
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process adopts the polymer network gel method, which uses the polymerization reaction of acrylamide and methylenebisacrylamide to form a wet gel, so that the ions in the solution are evenly distributed in the polymer network structure, thereby obtaining the structure and shape. A nano-zinc oxide photocatalyst with good appearance, which solves the problems of difficult removal of water in the solution and long reaction time in the sol-gel method
However, since acrylamide is a moderate neurotoxin, the process is limited in large-scale industrial production
Moreover, the sol-gel method generally has the disadvantages of expensive raw materials, long preparation cycle, and easy secondary pollution in the process.

Method used

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  • Preparation method and application of nano zinc oxide photocatalyst
  • Preparation method and application of nano zinc oxide photocatalyst
  • Preparation method and application of nano zinc oxide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 2.0 g of polyvinyl alcohol (PVA) into a 500 ml flask, add 200 ml of deionized water, then put the flask into a 70°C water bath and heat and stir for 30 min to obtain a clear and transparent PVA aqueous solution. Add 8.0g zinc nitrate hexahydrate [Zn(NO 3 ) 2 ·6H 2 O] to obtain polyvinyl alcohol-zinc nitrate (PVA-Zn) solution. Pour the above solution into the sample tray of the lyophilizer and fully pre-freeze it at a low temperature; then place it in a lyophilizer with a cold trap temperature of -55°C and a working pressure of 10 Pa for 10 hours to obtain polyvinyl alcohol- Zinc nitrate (PVA-Zn) white foamy solid. Put the above solid into a muffle furnace and calcinate at 550° C. for 6 hours to obtain nanometer zinc oxide powder.

Embodiment 2

[0033] Weigh 4.0g of polyvinyl alcohol (PVA) into a 500ml flask, add 200ml of deionized water, then put the flask into a 70°C water bath and heat and stir for 30min to obtain a clear and transparent PVA aqueous solution. Add 16.0g zinc nitrate hexahydrate [Zn(NO 3 ) 2 ·6H 2 O] to obtain a mixed aqueous solution of polyvinyl alcohol-zinc nitrate (PVA-Zn). Pour the above aqueous solution into the sample tray of the lyophilizer and fully pre-freeze at a low temperature; then place it in a lyophilizer with a cold trap temperature of -55°C and a working pressure of 10Pa for 10 hours to obtain polyvinyl alcohol- Zinc nitrate (PVA-Zn) white foamy solid. Put the above solid into a muffle furnace and calcinate at 550° C. for 6 hours to obtain nanometer zinc oxide powder.

[0034] The X-ray diffraction pattern (XRD) of the nano zinc oxide photocatalyst prepared in the present embodiment is as follows figure 2 shown. Depend on figure 2 It can be seen that the prepared powder mat...

Embodiment 3

[0037]Weigh 10.0g of polyvinyl alcohol (PVA) into a 500ml flask, add 200ml of deionized water, then place the flask in a 70°C water bath and heat and stir for 30min to obtain a clear and transparent PVA aqueous solution. Add 40.0g zinc nitrate hexahydrate [Zn(NO 3 ) 2 ·6H 2 O] to obtain a mixed aqueous solution of polyvinyl alcohol-zinc nitrate (PVA-Zn). Pour the above aqueous solution into the sample tray of the lyophilizer and fully pre-freeze at a low temperature; then place it in a lyophilizer with a cold trap temperature of -55°C and a working pressure of 10Pa for 10 hours to obtain polyvinyl alcohol- Zinc nitrate (PVA-Zn) white foamy solid. Put the above solid into a muffle furnace and calcinate at 550° C. for 6 hours to obtain nanometer zinc oxide powder.

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Abstract

The invention discloses a preparation method and application of a nano zinc oxide photocatalyst. The preparation method takes polyvinyl alcohol (PVA) and zinc nitrate hexahydrate [Zn(NO3)2.6H2O] as raw materials, and comprises the following steps: firstly, preparing a polyvinyl alcohol-zinc nitrate mixture water solution; secondly, removing water in the mixture water solution by adopting a vacuum freezing and drying technology to obtain a polyvinyl alcohol-zinc nitrate white foam-shaped solid; finally, calcining the solid to obtain a product nano zinc oxide powder. The preparation process disclosed by the invention has a simple flow, the raw materials are easily obtained and a preparation process is clean and has no pollution; the nano zinc oxide powder prepared by adopting the vacuum freezing and drying technology is not agglomerated and has high purity and crystallization degree; the nano zinc oxide photocatalyst has good photocatalytic activity on an azo congo red dye and an anthraquinone active brilliant blue KN-R dye under ultraviolet light, and has a good application prospect in the aspect of organic dye wastewater treatment.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials and environmental pollution control, and specifically relates to a preparation method and a specific application method of a nanometer zinc oxide photocatalyst that can be used to degrade organic dye wastewater. Background technique [0002] With the rapid development of printing and dyeing, pharmaceutical, chemical and other industries, a large amount of organic dye wastewater with high concentration, high toxicity and poor biodegradability has emerged, seriously polluting the water ecological environment and endangering human health. Under the irradiation of light, semiconductor materials can be used as catalysts to convert light energy into chemical energy, thereby promoting the synthesis or degradation of compounds, which is the so-called photocatalytic technology. At present, the photocatalytic degradation of organic pollutants in industrial wastewater by using semiconductor mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06C01G9/02B82Y30/00C02F1/30
CPCB01J23/06B01J35/0013B01J35/004B82Y30/00C01G9/02C01P2002/72C01P2004/03C01P2004/64C02F1/30C02F2101/308
Inventor 金君素刘博林游杨光刘洪涛吴浩
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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