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Preparation method of precious metal silver loaded nano-zinc oxide powder

A technology of nano-zinc oxide powder and precious metals, applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc. , harsh reaction conditions and other issues, to achieve the effect of improving particle size and chemical uniformity, avoiding hard agglomeration, and uniform grain size distribution

Inactive Publication Date: 2019-11-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods all prepare silver-loaded nanoparticles, the preparation process is complex, the reaction conditions are harsh, and organic solvents are used more. At the same time, they are easy to agglomerate during heat treatment, and the morphology of the particles cannot be effectively controlled

Method used

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  • Preparation method of precious metal silver loaded nano-zinc oxide powder
  • Preparation method of precious metal silver loaded nano-zinc oxide powder
  • Preparation method of precious metal silver loaded nano-zinc oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 1.0 g of polyvinyl alcohol (PVA) into a 100 mL flask, add 50 mL of deionized water, heat and stir the flask in an oil bath at 75°C for 30 min, and obtain a colorless and transparent PVA sol with a mass concentration of 20 mg / mL. The PVA aqueous solution was cooled to room temperature, and 4.0 g of zinc nitrate hexahydrate [Zn(NO 3 ) 2 ·6H 2 O] and 400mg silver nitrate, stirred for 30min to obtain polyvinyl alcohol-zinc nitrate-silver nitrate solution. Put the above solution into the refrigerator to fully pre-freeze, then place the cold trap temperature at -55°C and freeze-dry in a freeze dryer with a working pressure of 10Pa to obtain polyvinyl alcohol-zinc nitrate-silver nitrate (PVA-Zn-Ag ) brown foamy solid. Take an appropriate amount of the above solids and put them into a crucible, place them in a muffle furnace at 550°C for 2 hours and keep them warm for 6 hours for calcination to obtain silver-loaded nano-zinc oxide powder.

[0023] The SEM picture of t...

Embodiment 2

[0025] Weigh 1.5g of polyvinyl alcohol (PVA) into a 100mL flask, add 50mL of deionized water, heat and stir the flask in an oil bath at 75°C for 30min, and obtain a colorless and transparent PVA sol with a mass concentration of 30mg / mL. The PVA aqueous solution was cooled to room temperature, and 6.0 g of zinc nitrate hexahydrate [Zn(NO 3 ) 2 ·6H 2 O] and 600mg silver nitrate, stirred for 30min to obtain polyvinyl alcohol-zinc nitrate-silver nitrate solution. Put the above solution into the refrigerator to fully pre-freeze, then place the cold trap temperature at -55°C and freeze-dry in a freeze dryer with a working pressure of 10Pa to obtain polyvinyl alcohol-zinc nitrate-silver nitrate (PVA-Zn-Ag ) brown foamy solid. Take an appropriate amount of the above solids and put them into a crucible, place them in a muffle furnace at 550°C for 2 hours and keep them warm for 6 hours for calcination to obtain silver-loaded nano-zinc oxide powder.

Embodiment 3

[0030] Weigh 1.0 g of polyacrylamide (PAM) into a beaker, add 50 mL of deionized water, and stir for 30 min to obtain a colorless and transparent PAM sol with a mass concentration of 20 mg / mL. Add 4.0g zinc nitrate hexahydrate [Zn(NO 3 ) 2 ·6H 2 O] and 400mg silver nitrate, stirred for 30min to obtain polyacrylamide-zinc nitrate-silver nitrate solution. Put the above solution into the refrigerator to fully pre-freeze, then place the cold trap temperature at -55°C and freeze-dry in a freeze dryer with a working pressure of 10Pa to obtain polyacrylamide-zinc nitrate-silver nitrate (PAM-Zn-Ag ) brown foamy solid. Take an appropriate amount of the above solids and put them into a crucible, place them in a muffle furnace at 550°C for 2 hours and keep them warm for 6 hours for calcination to obtain silver-loaded nano-zinc oxide powder.

[0031] The SEM picture of the silver-loaded nano-zinc oxide powder prepared in this example is shown in Figure 4 . from Figure 4 It can be...

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Abstract

The invention discloses a preparation method of precious metal silver loaded nano-zinc oxide powder. The preparation method comprises the steps that a water-soluble polymer, zinc nitrate hexahydrate and silver nitrate are taken as raw materials, and through a simple mixing reaction, a gel solution with a certain concentration is prepared; a brown spumescence intermediate is obtained through freezedrying, and finally, calcination is conducted to obtain a silver-zinc oxide target product. Through the entropy effect generated by abundant chain conformations of the water-soluble polymer and strong hydrogen bond association generated by hydrophilic groups on a chain and hydroxyl on the surfaces of particles, dispersion of zinc oxide and silver nanoparticles in a polymer aqueous solution is promoted, and thus nano silver particle loaded zinc oxide with high dispersity is obtained. The preparation technique is simple in process, the prepared powder is good in dispersity, hard agglomeration of the particles is less, the nano silver particle loaded zinc oxide with the high utilization rate and the high dispersity is obtained, the use amount of silver is decreased, raw materials are low incost and easy to obtain, the environment-friendly and pollution-free effects are realized, and the preparation method of the precious metal silver loaded nano-zinc oxide powder is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of material synthesis of photocatalyst nano-zinc oxide, in particular to a preparation method of precious metal silver-loaded nano-zinc oxide. Background technique [0002] In recent years, the issue of water treatment has been the focus of increasing attention of the international community. Dye industrial wastewater is one of the key pollution sources of the environment, and the outstanding problems in the treatment are the removal of chromaticity and refractory organic matter. At present, there are many physical, chemical and biological methods that can be used for the decolorization and degradation treatment of dye wastewater, but due to the limitation of wastewater treatment efficiency and treatment cost, the treatment effect is not very satisfactory. [0003] Heterogeneous photocatalytic technology can not only effectively degrade pollutants such as dyes, phenols, hydrocarbons, and nitrogen-containing organic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60B01J37/08B01J37/32B82Y30/00B82Y40/00C02F1/30
CPCB01J23/60B01J37/088B01J37/32B01J37/0072C02F1/30B82Y30/00B82Y40/00C02F2305/10C02F2101/308B01J35/393
Inventor 金君素李雪丽
Owner BEIJING UNIV OF CHEM TECH
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