Porous zinc oxide-silver composite nanorod, as well as preparation method and application thereof

A technology of porous zinc oxide and zinc oxide, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc. problem, to achieve good visible light catalytic degradation effect, scientific preparation method, and high specific surface area

Inactive Publication Date: 2012-08-29
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter whether it is a porous composite photocatalyst or its preparation method, there are shortcomings. First, the volume of the porous composite photocatalyst with a length of about 4 μm, a width of about 1.5-2 μm and a height of about 1.5-2 μm is too large. , resulting in a small specific surface area, which restricts the full contact with the reactant when it is used as a catalyst
In addition, the particle size of zinc oxide particles and silver particles constituting the porous composite photocatalyst, as well as the important / key parameters such as mesopore diameter are unknown; secondly, the preparation method cannot obtain the final product with small volume and large specific surface area; thirdly, The prepared porous composite photocatalyst can only degrade methyl orange dye under the condition of ultraviolet light

Method used

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  • Porous zinc oxide-silver composite nanorod, as well as preparation method and application thereof
  • Porous zinc oxide-silver composite nanorod, as well as preparation method and application thereof
  • Porous zinc oxide-silver composite nanorod, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The concrete steps of preparation are:

[0035] Step 1, firstly mix zinc acetate ethanol solution and oxalic acid dihydrate ethanol solution with a molar ratio of 0.8:1.2, both of which have a concentration of 0.5M, to obtain a mixed solution. Then the mixed solution was placed in a closed state, and kept at a temperature of 70° C. for 7 hours to obtain an intermediate product of zinc oxide.

[0036] Step 2, the intermediate product of zinc oxide is first centrifuged, washed and dried to obtain zinc oxalate; wherein, the speed of centrifugal treatment of the intermediate product of zinc oxide is 6000r / min, the time is 3min, and the washing process is alternately using deionized Water and ethanol repeatedly wash the powdery zinc oxide intermediate product obtained after centrifugation until the washing solution becomes neutral, and the zinc oxide intermediate product is dried at 55° C. for 1.2 hours after centrifugation and washing. Zinc oxalate was annealed at 430° C. ...

Embodiment 2

[0039] The concrete steps of preparation are:

[0040] Step 1, firstly mix zinc acetate ethanol solution and oxalic acid dihydrate ethanol solution with a molar ratio of 0.9:1.1, both of which have a concentration of 0.6M, to obtain a mixed solution. Then the mixed solution was placed in a closed state, and kept at a temperature of 75° C. for 6.5 hours to obtain an intermediate product of zinc oxide.

[0041] Step 2, the zinc oxide intermediate product is first centrifuged, washed and dried to obtain zinc oxalate; wherein, the zinc oxide intermediate product is centrifuged at a speed of 6500r / min and the time is 2.5min, and the washing process is used alternately to remove The powdered zinc oxide intermediate product obtained after the centrifugation treatment was repeatedly washed with ionized water and ethanol until the washing liquid was neutral, and the zinc oxide intermediate product was dried at 58° C. for 1.2 hours after centrifugation and washing. Zinc oxalate was ann...

Embodiment 3

[0044] The concrete steps of preparation are:

[0045] Step 1: firstly mix zinc acetate ethanol solution and oxalic acid dihydrate ethanol solution with a molar ratio of 1:1 to obtain a mixed solution. Then the mixed solution was placed in a closed state, and kept at a temperature of 80° C. for 6 hours to obtain an intermediate product of zinc oxide.

[0046] Step 2, the intermediate product of zinc oxide is first centrifuged, washed and dried to obtain zinc oxalate; wherein, the intermediate product of zinc oxide is centrifuged at a speed of 7000r / min and the time is 2min, and the washing process is alternately using deionized Water and ethanol repeatedly wash the powdery zinc oxide intermediate product obtained after centrifugation until the washing solution is neutral, and the zinc oxide intermediate product is dried at 60° C. for 1.1 h after centrifugation and washing. Zinc oxalate was annealed at 450° C. for 2.5 hours, and then cooled to room temperature naturally to obt...

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Abstract

The invention discloses a porous zinc oxide-silver composite nanorod, as well as a preparation method and application thereof. The composite nanorod is formed by zinc oxide particles; sliver particles are loaded on the surface of the in porous rodlike zinc oxide, meso pores are formed between zinc oxide and / or silver particles, the rod length of the porous rodlike zinc oxide is 0.6-3 mum, the rod diameter is 90-150 nm, the specific surface area is 18-22m<2> / g, the particle size of the zinc oxide is 10-30nm, the size of the silver particles is 20-30nm, and the meso pore diameter is 3-30nm. The method comprises the following steps of: firstly mixing zinc acetate ethanol solution and ethanol oxalate dehydrate solution; putting the mixture in a seal state; insulating for at least 5h at the temperature of 70-90 DEG C; centrifuging, washing and drying; annealing the obtained zinc oxalate for at least 2h at the temperature of 430-470 DEG C; adding the zinc oxalate into silver nitrate ethylene glycol solution; stirring for at least 15min under visible light; and centrifuging, washing and drying, thereby preparing a target product. The porous zinc oxide-silver composite nanorod can be used for carrying out visible light catalytic degradation in water polluted by organic matters.

Description

technical field [0001] The invention relates to a composite nanorod and its preparation method and application, in particular to a porous zinc oxide-silver composite nanorod and its preparation method and application. Background technique [0002] In recent years, various environmental problems such as water pollution, soil pollution, and air pollution have promoted the research on basic theories and applications in the field of environment. Among them, organic pollution has always been a pollution problem that is difficult to completely eliminate in environmental treatment. Semiconductor materials have the ability to adsorb and photocatalytically degrade pollutants, which offers potential applications for the complete elimination of toxic chemicals in the environment. As one of the semiconductor materials, zinc oxide is a wide bandgap semiconductor with discontinuous energy band, and its bandgap width is 3.37eV; when the external photon energy is greater than 3.37eV, the va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66A62D3/10A62D101/28A62D101/22
Inventor 汪国忠邓泉段晓微蔡伟平孔明光
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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