Preparation method of surfactant for photo-reduction method of Ag/TiO2 nano heterogenous junction by virtue of induction

A surfactant and heterojunction technology, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. problems such as low rate, to achieve the effect that the process method is simple and easy to implement, efficient utilization and low cost

Inactive Publication Date: 2013-11-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, previous studies did not well address two issues
One is that due to the noble metal nanoparticle layer on the TiO 2 Disordered coverage of the surface, resulting in contaminants and TiO 2 The contact area of ​​the surface decreases sharply, and at the same time, its contact with TiO 2 The coupling effect between semiconductors cannot be fully exerted
On the other hand, modified TiO 2 The nanoscale noble metal particle size is not uniform and the utilization of visible light is very low, which is reflected in the fact that it takes several hours to bleach the dye reported in earlier studies

Method used

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  • Preparation method of surfactant for photo-reduction method of Ag/TiO2 nano heterogenous junction by virtue of induction
  • Preparation method of surfactant for photo-reduction method of Ag/TiO2 nano heterogenous junction by virtue of induction
  • Preparation method of surfactant for photo-reduction method of Ag/TiO2 nano heterogenous junction by virtue of induction

Examples

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preparation example Construction

[0020] Ag / TiO 2 The steps of the photoreduction method surfactant-induced preparation method of nano heterojunction are as follows:

[0021] 1) Add 0.1~1.0g TiO with 0.1~0.5ml oleic acid, oleylamine or 1-octadecene as surfactant 2 Disperse the nanocrystals in 50ml chloroform, stir and mix evenly to obtain TiO 2 Nanocrystalline dispersion;

[0022] 2) Take 0.2~0.5g AgNO 3 Dissolve in 10ml ethanol, add TiO 2 Stir the nanocrystalline dispersion liquid evenly, then transfer it to a three-necked flask, degas with argon for 20-60 minutes, seal, and use xenon lamp as the light source for 30-90 minutes photoreduction synthesis under stirring to obtain Ag / TiO 2 Nano heterojunction.

Embodiment 1

[0025] The rod-shaped TiO with oleic acid as surfactant 2 Disperse the nanocrystals in 50ml chloroform, stir and mix evenly to obtain uniform and transparent TiO 2 Nanocrystalline dispersion, rod-shaped TiO 2 The amount of nanocrystals added is 0.8g.

[0026] Take 0.3g AgNO 3 Dissolved in 10ml of ethanol, the resulting solution and the above TiO 2 The nanocrystalline dispersion was mixed, stirred uniformly, and then transferred to a three-necked flask, and the system was degassed with argon for 30 minutes. Finally, the mixture was sealed in a flask, and under agitation, a xenon lamp was used as a light source to perform photoreduction synthesis for 30 min, 60 min, and 90 min, respectively, to prepare three kinds of "match stick"-like structures (Ag particles / TiO 2 Nanorods) Ag / TiO 2 Nano heterojunction samples.

[0027] Characterization of synthesized TiO by TEM (80kV) 2 Nanorods and Ag / TiO 2 The size and morphology of the heterojunction. The structure of the sample is analyzed by ...

Embodiment 2

[0039] The rod-shaped TiO with oleylamine as surfactant 2 Disperse the nanocrystals in 50ml chloroform, stir and mix evenly to obtain uniform and transparent TiO 2 Nanocrystalline dispersion, rod-shaped TiO 2 The amount of nanocrystals added is 0.5g.

[0040] Take 0.2g AgNO 3 Dissolved in 10ml of ethanol, the resulting solution and the above TiO 2 The nanocrystalline dispersion was mixed, stirred uniformly, and then transferred to a three-necked flask, and the system was degassed with argon for 60 minutes. Finally, the mixture was sealed in a flask, and the xenon lamp was used as a light source for 45 minutes of photoreduction synthesis under stirring. Finally, a similar photocatalytic performance as in Example 1 was successfully prepared and it had a "match stick" structure. (Ag particles / TiO 2 Nanorods) Ag / TiO 2 Nano heterojunction.

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Abstract

The invention discloses a preparation method of a surfactant for a photo-reduction method of a Ag / TiO2 nano heterogenous junction by virtue of induction. The preparation method comprises the following steps of: 1) dispersing 0.1-1.0g of TiO2 nano crystal taking 0.1-0.5ml of oleic acid, oil amine or 1-octadecene as surfactant into 50ml of chloroform, stirring to be uniform, so as to obtain TiO2 nano crystal dispersion; 2) taking 0.2-0.5g of AgNO3 and dissolving AgNO3 into 10ml of ethanol, adding the TiO2 nano crystal dispersion, stirring to be uniform, then transferring mixed solution into a three-opening flask, degassing for 20-60min with argon, sealing, and carrying out photo-reduction synthesis for 30-90min under the conditions of stirring and taking an xenon lamp as a light source, thus the Ag / TiO2 nano heterogenous junction is obtained. By applying the preparation method disclosed by the invention, novel photocatalysis material with low cost and high efficiency and other photoelectric functional materials are hopeful to be developed. The synthetic method disclosed by the invention is also effective when being used for preparing a more complex functional nano structure.

Description

Technical field [0001] The invention relates to an Ag / TiO 2 Nano heterojunction photoreduction method surfactant induction preparation method. Background technique [0002] In recent decades, due to the increasingly serious environmental pollution and energy crisis, people have conducted extensive research to explore new and practical environmental protection treatment technologies. Semiconductor photocatalysis technology provides an opportunity to solve this problem. Titanium dioxide is considered to be the most potential photocatalyst due to its high chemical stability, non-toxicity and low price. However, due to TiO 2 The band gap is large (Eg≈3.0-3.2ev), and the absorption spectrum is in the near ultraviolet region (λ <400nm), in order to improve the use of sunlight, scholars have expanded the semiconductor photocatalysis to λ≥400 through the synthesis of new narrow band gap semiconductors, semiconductor compounding, dye photosensitization, metal ion doping, and non-metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/02B01J37/16C02F1/30
Inventor 王智宇胡荣陈超樊先平钱国栋
Owner ZHEJIANG UNIV
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