Nanometer doped zinc oxide and its prepn and application in photocatalysis to degrade organic matter and kill bacteria

A nano-zinc oxide and zinc oxide technology, applied in the fields of environmental protection, photocatalysis, and inorganic materials, can solve the problems of low solubility and weak antibacterial effect of common metal silver, and achieve simple operating conditions, short production process, and improved antibacterial effect of ability

Inactive Publication Date: 2006-05-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the stability of silver, its solubility in media other than nitric aci...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0031] Preparation of silver-doped nano-zinc oxide and photocatalytic degradation of acetaldehyde gas by organic compound method. Weigh 30.05g. Zinc nitrate hexahydrate Zn(NO 3 ) 2 ·6H 2Pour O into a 250ml evaporating dish, dissolve it with 100ml deionized water, then add 19ml of silver nitrate solution with a concentration of 0.04mol / L after metallic silver is dissolved in nitric acid, then add 21.4g of citric acid, heat and evaporate on an electric furnace The water was evaporated in a dish, and the solution gradually became viscous. It was moved into a box-type resistance furnace and heat-treated at 500°C for 240 minutes in an air atmosphere to obtain a light yellow fluffy substance. Measured by X-ray diffraction (XRD), the product is wurtzite-type zinc oxide doped with 1% silver; observed by transmission electron microscope (TEM), the average particle size of zinc oxide is about 60nm; by XPS, TEM selected area electron diffraction SAED determined that silver exists in z...

Embodiment 2

[0035] Preparation of cerium-doped nano zinc oxide and photocatalytic degradation of formaldehyde gas by spray pyrolysis. Zinc acetate and cerous nitrate are used as raw materials, the concentration of zinc acetate is 2mol / L, and cerous nitrate is added to make an aqueous solution according to the proportion of 2% doped with cerium, which is put into an ultrasonic atomizer and sprayed into a pyrolysis furnace. Set at 800° C., carry out thermal decomposition under the condition of feeding air, and inject 300 ml per hour, and collect the product. According to X-ray diffraction (XRD) measurement and transmission electron microscope (TEM) observation, the product is wurtzite type zinc oxide, and the average particle diameter of zinc oxide is about 81nm. Zinc oxide without cerium was prepared by the same method, and the particle size was about 75nm. Weigh 0.8g of the cerium-doped nano-zinc oxide, spread it in a petri dish, put the petri dish into a 500ml photocatalytic reactor, se...

Embodiment 3

[0039] Preparation of silver and lanthanum nano-zinc oxide and antibacterial by organic complexation method. Weigh 15g zinc nitrate hexahydrate Zn(NO 3 ) 2 ·6H 2 Pour O into a 250ml evaporating dish, dissolve it with 30ml deionized water, weigh 1g of 99.95% lanthanum oxide, dissolve it with dilute nitric acid, put it into a volumetric flask, and add 1.5% lanthanum into the volumetric flask with a pipette to evaporate In the dish, add silver nitrate solution according to the amount of 1% silver doping, weigh 6g of glycine, pour into the evaporating dish and mix with the solution. Dehydrate in an oven at 140°C for 300 minutes to obtain a yellow viscous jelly. Put the jelly in a microwave oven for 8 minutes to produce a violent combustion reaction and collect the product. As determined by X-ray diffraction (XRD), the product is wurtzite-type zinc oxide; observed by transmission electron microscope (TEM), the average particle diameter of zinc oxide is about 23nm. Then heat tre...

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Abstract

The present invention relates to Ag and RE doped nanometer zinc oxide and its preparation process and application in photocatalysis to degrade organic matter and killing bacteria. Ag, RE metals La, Ce, Pr, Nd, Sm, etc. are doped into nanometer zinc oxide to raise its photocatalytic activity in degrading harmful chemical matter and resisting bacteria. Under lighting, the doped nanometer zinc oxide has higher photocatalytic activity and higher antibacterial capacity; and in case of no lighting, it has relatively high antibacterial effect owing to the antibacterial effect one Ag, Zn, RE and other antibacterial ions. The preparation process may be an organic matter complexing process or a sprying pyrolysis process. The doped nanometer zinc oxide may be used through mixing with other material, or used as additive added into plastic, ceramic, fiber, timber, rubber, glass, cement, metal and other material to form various kinds of photocatalytic antibacterial material and product.

Description

technical field [0001] The invention belongs to the technical fields of photocatalysis, environmental protection and inorganic materials. The invention relates to nano-zinc oxide doped with silver and rare earth metals, a preparation method thereof, and applications of photocatalytic degradation of organic matter and antibacterial. technical background [0002] The pathogenic substances contained in the air can cause serious harm to the human body. such as CO and SO in the air 2 , NO x 、H 2 S, NH 3 , formaldehyde, acetaldehyde, benzene and its homologues, total volatile organic compounds (TVOC), etc., have caused great damage to human health. Formaldehyde (HCHO) is a colorless and soluble irritating gas. Formaldehyde can be absorbed through the respiratory tract, and its aqueous solution "formalin" can be absorbed through the digestive tract. Acetaldehyde dissolves in water, causing chemical changes in the water quality. Drinking this kind...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J23/50B01J37/00
Inventor 李敦钫祝梅邹志刚
Owner NANJING UNIV
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