Silver nanorod-titanium dioxide composite material and its preparation method and application

A silver nanorod, titanium dioxide technology, applied in the field of photocatalytic materials, can solve the problems of insufficient utilization, low pollutant concentration, limited enhancement effect, etc., to increase the utilization of solar energy spectrum, increase the contact area, and improve the photocatalytic activity. Effect

Active Publication Date: 2020-05-22
JIANGSU ANNATAI ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has many problems in the degradation of organic pollutants in the gas phase: First, under the traditional liquid-phase photocatalytic conditions, the concentration of pollutant molecules is relatively high, and these pollutant molecules interact with the photocatalyst through random motion. contact and degrade on its surface, but under gas phase conditions, the concentration of pollutants is low and the residence time is short, so the photocatalytic material is required to have a large contact area, which can effectively adsorb pollutant molecules; secondly, the surface of silver nanowires is smooth, The enhancement effect on light is limited, and the surface plasmon resonance effect of noble metals cannot be fully utilized

Method used

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  • Silver nanorod-titanium dioxide composite material and its preparation method and application
  • Silver nanorod-titanium dioxide composite material and its preparation method and application
  • Silver nanorod-titanium dioxide composite material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0036]Disperse 0.875mg of silver nanorods in 30ml of ethanol and ultrasonically disperse for 30 minutes to obtain a uniform and stable dispersion of silver nanorods with good dispersion. Add 1.5ml of tetrabutyl titanate to the dispersion, continue stirring and then add dropwise 1ml of deionized water, continue to stir for 20min, after fully stirring, transfer to a 50ml reaction kettle, put in an oven at 160°C for 10h, then centrifuge, wash and dry to obtain silver nanorod-titanium dioxide composite powder, in which the silver nanorod The weight ratio is 0.25%.

[0037] Take 0.2g of silver nanorod-titanium dioxide powder, add 2g of absolute ethanol, and ball mill for 24 hours to obtain a silver nanorod-titanium dioxide ethanol dispersion, which is scraped on a 5cm*10cm glass plate and dried naturally to obtain a silver nanorod- Titanium dioxide coating, the quality control of the coating is 0.1g.

Embodiment 2

[0039] Disperse 1.75mg of silver nanorods in 30ml of ethanol, ultrasonically disperse for 30 minutes to obtain a uniform and stable dispersion of silver nanorods with good dispersion, add 1.5ml of tetrabutyl titanate to the dispersion, continue stirring and then add dropwise 1ml of deionized water, continue to stir for 20min, after fully stirring, transfer to a 50ml reaction kettle, put in an oven at 160°C for 10h, then centrifuge, wash and dry to obtain silver nanorod-titanium dioxide composite powder, in which silver nanorod The weight ratio is 0.5%.

[0040] Take 0.2g of silver nanorod-titanium dioxide powder, add 2g of absolute ethanol, and ball mill for 24 hours to obtain a silver nanorod-titanium dioxide ethanol dispersion, which is scraped on a 5cm*10cm glass plate and dried naturally to obtain a silver nanorod- Titanium dioxide coating, the quality control of the coating is 0.1g.

Embodiment 3

[0042] Disperse 2.625mg of silver nanorods in 30ml of ethanol and ultrasonically disperse for 30 minutes to obtain a uniform and stable dispersion of silver nanorods with good dispersion. Add 1.5ml of tetrabutyl titanate to the dispersion, and add 1ml of it dropwise after continuous stirring. deionized water, continue to stir for 20min, after fully stirring, transfer to a 50ml reaction kettle, put in an oven at 160°C for 10h, then centrifuge, wash and dry to obtain silver nanorod-titanium dioxide composite material powder, in which the silver nanorod The weight ratio is 0.75%.

[0043] Take 0.2g of silver nanorod-titanium dioxide powder, add 2g of absolute ethanol, and ball mill for 24 hours to obtain a silver nanorod-titanium dioxide ethanol dispersion, which is scraped on a 5cm*10cm glass plate and dried naturally to obtain a silver nanorod- Titanium dioxide coating, the quality control of the coating is 0.1g.

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Abstract

The invention belongs to the technical field of photocatalytic materials, and particularly relates to a silver nanorod and titanium dioxide composite material as well as a preparation method and application thereof. The silver nanorod and titanium dioxide composite material comprises silver nanorods and titanium dioxide particles, wherein the titanium dioxide particles are partially grown in situ on the surfaces of the silver nanorods, and the other part of the titanium dioxide particles is dispersed in gaps between the silver nanorods; the weight ratio of the silver nanorods to the titanium dioxide is (0.0025-1):1. The invention provides the silver nanorod and titanium dioxide composite material which can effectively degrade a gaseous pollutant photocatalytically, and the preparation method and application thereof.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a silver nanorod-titanium dioxide composite material and its preparation method and application. Background technique [0002] Titanium dioxide, as an ideal semiconductor material, is widely used in solar cells, photocatalytic hydrogen production, and photocatalytic degradation of organic and inorganic pollutants due to its stable physical and chemical properties, chemical and photocorrosion resistance, non-toxicity, and low cost. But TiO 2 As a wide bandgap semiconductor material, there are still some obvious deficiencies. Its bandgap is too large, so that it has a narrow response range to light, so it can only be excited by ultraviolet light; and ultraviolet light only accounts for 5% of the solar spectrum. Thereby greatly reducing its utilization of solar energy; in addition, TiO 2 The excited electron-hole pairs are prone to recombination, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/00B01J35/02B01D53/86
CPCB01D53/86B01D2257/70B01D2259/802B01J23/50B01J35/004B01J35/023
Inventor 谢晓峰曾庆龙吕娜王晓史淦生
Owner JIANGSU ANNATAI ENVIRONMENTAL PROTECTION TECH CO LTD
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