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

A surfactant and heterojunction technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of reduced contact area, uneven size of nano-noble metal particles, low utilization rate of visible light, etc. problems, to achieve the effect of low cost, simple and easy-to-implement process and high efficiency

Inactive Publication Date: 2012-06-27
ZHEJIANG UNIV
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  • Abstract
  • Description
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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
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  • Preparation method of surfactant for photo-reduction method of Ag/TiO2 nano heterogenous junction by virtue of induction

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preparation example Construction

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

[0021] 1) 0.1-1.0g TiO with 0.1-0.5ml of oleic acid, oleylamine or 1-octadecene as surfactant 2 Nanocrystals are dispersed in 50ml chloroform, stirred and mixed evenly to obtain TiO 2 Nanocrystalline dispersion;

[0022] 2) Take 0.2-0.5g of AgNO 3 Dissolve in 10ml ethanol, add TiO 2 Nanocrystalline dispersion, stirred evenly, then transferred to a three-necked flask, degassed with argon for 20-60 minutes, sealed, and carried out photoreduction synthesis with xenon lamp as light source for 30-90 minutes under stirring to obtain Ag / TiO 2 nanoheterojunction.

Embodiment 1

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

[0026] Take 0.3g of AgNO 3 Dissolved in 10ml ethanol, the resulting solution was mixed with the above TiO 2 The nanocrystal dispersion liquid was mixed, stirred evenly, 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 the photoreduction synthesis was carried out for 30 min, 60 min and 90 min under the condition of stirring with a xenon lamp as a light source, thereby preparing three kinds of "matchstick"-like structures (Ag particles / TiO 2 nanorods) Ag / TiO 2 Nano-heterojunction samples.

[0027] The as-synthesized TiO was characterized by TEM (80kV) 2 Nanorods and Ag / TiO 2 Size and morphology of heterojunctions. XRD was used to analyz...

Embodiment 2

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

[0040] Take 0.2g of AgNO 3 Dissolved in 10ml ethanol, the resulting solution was mixed with the above TiO 2 The nanocrystal dispersion was mixed, stirred evenly, 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 photoreduction synthesis was carried out for 45 minutes with xenon lamp as the light source under the condition of stirring, and finally successfully prepared a compound with excellent photocatalytic performance and a "matchstick" structure similar to Example 1. (Ag particles / TiO 2 nanorods) Ag / TiO 2 nanoheterojunction.

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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 present invention relates to a kind of Ag / TiO 2 Photoreduction Surfactant-Induced Preparation of Nanoheterojunctions. 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. Among them, titanium dioxide is considered to be the most potential photocatalyst because of its high chemical stability, non-toxicity and low price. However, due to TiO 2 The bandgap width is large (Eg≈3.0-3.2ev), and its absorption spectrum is in the near-ultraviolet region (λ<400nm). Chemical, metal ion doping, non-metallic doping and other methods have extended semiconductor photocatalysis to the visible light range of λ≥400 nm. But these methods of changing the bandgap reduce the nano-TiO 2 The r...

Claims

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Application Information

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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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