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

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 ...

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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

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