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Preparation method of Ag/Ag (I)-TiO2 nanocrystalline visual light photochemical catalyst

A photocatalyst and nanocrystal technology, which is applied in the preparation field of Ag/Ag(I)-TiO2 nanocrystal visible light photocatalyst, can solve the problems of short photogenerated carrier lifetime, low photocatalytic activity and low quantum yield , to achieve high visible light photocatalytic performance, simple operation, and low equipment requirements

Inactive Publication Date: 2012-08-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, TiO2 still has the following defects: (1) The photogenerated carriers have a short lifetime and are easy to recombine, which makes the quantum yield of TiO2 (2) TiO2 has a wide band gap, and the band gap of anatase TiO2 is 3.2 eV, which is limited to the excitation wavelength Ultraviolet light less than 387 nm limits its utilization of visible light, which accounts for the vast majority of sunlight
To the best of our knowledge, there is no report on visible-light photocatalysts of TiO2 nanocrystals supported on silver surfaces and doped with silver ions by a simple preparation method.

Method used

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  • Preparation method of Ag/Ag (I)-TiO2 nanocrystalline visual light photochemical catalyst
  • Preparation method of Ag/Ag (I)-TiO2 nanocrystalline visual light photochemical catalyst
  • Preparation method of Ag/Ag (I)-TiO2 nanocrystalline visual light photochemical catalyst

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Experimental program
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Effect test

Embodiment 1

[0027] Ag / Ag(I)-TiO 2 The preparation process of nanocrystalline visible light photocatalyst is as follows: 1) TiO 2 Preparation of nanocrystals: 14 mL of butyl titanate was added to 1000 mL of deionized water under stirring at room temperature, stirred thoroughly for 2 h, left to age at 30 °C for 12 h, separated by filtration and separated with deionized water and anhydrous Washed with ethanol three times respectively, the obtained amorphous TiO 2 The powder was dried at 80°C for 6 h; then the dried TiO 2 The powder was crystallized at 500°C for 2 h to obtain anatase phase TiO 2 Nanocrystalline, with an average grain size of 30 nm and a specific surface area of ​​55.6 m 2 g -1 ; 2) Dissolve silver nitrate in deionized water to form a uniform solution, in which the molar concentration of silver nitrate is 0.1 mol L -1 ; 3) Add 1 g TiO 2 Nanocrystals dispersed to 9.3 mL 0.1 mol L -1 in silver nitrate solution, fully stirred for 2 h, dried at 80°C, and heat-treated the p...

Embodiment 2

[0036] In order to examine the effect of silver nitrate concentration on Ag / Ag(I)-TiO 2The effect of nanocrystalline visible light photocatalytic activity, in addition to the different concentration of silver nitrate, other reaction conditions such as: anatase phase TiO 2 Nanocrystalline raw material (1g, grain size is 10-50 nm, specific surface area is 55.6 m 2 g -1 ), the volume of silver nitrate solution (9.3 mL), stirring time (2 h), drying temperature (80 °C), final heat treatment temperature (450 °C) and heat treatment time (1 h) were all the same as in Example 1. The results showed that when the silver nitrate concentration was 0.01, 0.05, 0.2 and 0.5 mol L -1 , the prepared Ag / Ag(I)-TiO 2 The degradation rates of methyl orange by nanocrystalline photocatalysts were 0.04, 0.095, 0.98 and 0.06 min, respectively -1 . The reason may be that when the Ag content is less, the TiO 2 The content of Ag(I) ions in the phase is also less, resulting in a decrease in the abso...

Embodiment 3

[0039] In order to examine the effect of stirring time on Ag / Ag(I)-TiO 2 The effect of visible light photocatalytic activity of nanocrystals, in addition to different stirring time, other reaction conditions such as: anatase phase TiO 2 Nanocrystalline raw material (1g, grain size is 10-50 nm, specific surface area is 55.6 m 2 g -1 ), the volume of silver nitrate solution (9.3 mL), the concentration of silver nitrate solution (0.1 mol L -1 ), drying temperature (80°C), final heat treatment temperature (450°C) and heat treatment time (1 h) are all the same as in Example 1. The results showed that when the stirring time was 1, 2, 5 and 20 h, the prepared Ag / Ag(I)-TiO 2 The degradation rate of methyl orange by nanocrystalline photocatalyst is 0.095-0.105 min -1 between. The reason may be that AgNO 3 solution and TiO 2 It is easier to achieve adsorption-desorption equilibrium between nanocrystals, so that the photocatalytic properties of the final samples are comparable. ...

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Abstract

The invention relates to a preparation method of an Ag / Ag (I)-TiO2 nanocrystalline visual light photochemical catalyst, which comprises the following steps of (1) enabling silver nitrate to be soluble in deionized water to form uniform solution; (2) enabling 1g of TiO2 nanocrystalline to be dispersed in 9.3ml of silver nitrate solution prepared in the step (1), stirring, stoving and processing toobtain powder; and (3) conducting heat treatment on the powder prepared in the step (2) for 0.5-5h to obtain the Ag / Ag (I)-TiO2 nanocrystalline visual light photochemical catalyst. The preparation method is simple in operation, simultaneously the whole reaction process only needs common glass devices such as beakers, facility requests are low (only needing an oven and a high temperature furnace),no expensive machining synthesizing equipment and high temperature, high pressure reaction devices and the like is needed, and the photochemical catalyst is easy in mass synthesizing and the like. Prepared photochemical catalysis materials have high visual light catalytic performance, and are expected to obtain good social and economic benefits.

Description

technical field [0001] The present invention relates to metallic silver surface loading and silver ion doped TiO 2 (ie Ag / Ag(I)-TiO 2 ) Preparation method of nanocrystalline visible light photocatalyst. technical background [0002] The use of photocatalytic technology to solve environmental problems has attracted widespread interest and attention from governments, industrial departments and academic circles around the world. Practice has proved that among various semiconductor photocatalytic materials, titanium dioxide is most suitable for a wide range of environmental applications, because titanium dioxide has biological and Chemically inert, strong resistance to light and chemical corrosion. However, in practical applications TiO 2 There are also the following defects: (1) The life of photogenerated carriers is short, and it is easy to recombine, making TiO 2 The quantum yield is low, and the photocatalytic activity is not high; (2) TiO 2 Wide band gap, anatase TiO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50
Inventor 余火根刘锐王雪飞王苹
Owner WUHAN UNIV OF TECH
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