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Preparation method of TiO2 nanowire photocatalyst modified by Au nanoparticles

A photocatalyst and nanoparticle technology, applied in the field of photocatalyst preparation, can solve the problems of limited application, nano pollution, difficult recycling of catalysts, etc., and achieve the effects of improving utilization, avoiding pollution, and good reusability

Active Publication Date: 2015-04-01
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, TiO 2 The photocatalyst has a band gap of 3.2eV and can only absorb and utilize ultraviolet light, which only accounts for 3% of the sunlight spectrum, thus limiting its wide application.
In addition, previously most TiO 2 Photocatalysts are all in the form of powder, and there is a problem that the catalyst is difficult to recycle and even cause nano-pollution

Method used

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  • Preparation method of TiO2 nanowire photocatalyst modified by Au nanoparticles
  • Preparation method of TiO2 nanowire photocatalyst modified by Au nanoparticles
  • Preparation method of TiO2 nanowire photocatalyst modified by Au nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A Au / TiO 2 The preparation method of nanowire photocatalyst, the steps are as follows:

[0020] 1. TiO 2 Preparation of nanowires: Clean the titanium sheet with ethanol and pickle to remove the oil and oxide layer on the surface, then polish the surface of the titanium sheet with 1000-mesh sandpaper until the surface is uniform and smooth, and then oxidize it by anodic oxidation , the electrolyte is an ethylene glycol solution of water, the content of water is 3.5% (v / v), the content of ammonium fluoride is 0.4wt%, and the step-up method is adopted, and the boosting speed is 1 volt every 2 seconds , the highest voltage is 60V, the anodic oxidation treatment time is 2.5h, and after the oxidation treatment, it is calcined in the air at 450°C for 1h;

[0021] 2. Au nanoparticle modification: the adsorption-photoreduction method was used to treat TiO 2 The nanowires were modified with Au nanoparticles, and the gold source was chloroauric acid solution with a concentratio...

Embodiment 2

[0026] A Au / TiO 2 The preparation method of nanowire photocatalyst, the steps are as follows:

[0027] 1. TiO 2 Preparation of nanowires: Clean the titanium sheet with ethanol and pickle to remove the oil and oxide layer on the surface, then polish the surface of the titanium sheet with 1000-mesh sandpaper until the surface is uniform and smooth, and then oxidize it by anodic oxidation , the electrolyte is an ethylene glycol solution of water, the content of water is 4% (v / v), the content of ammonium fluoride is 0.45wt%, and the step-up method is adopted, and the boosting speed is 1 volt every 2 seconds , the highest voltage is 60V, the anodic oxidation treatment time is 2.5h, and after the oxidation treatment, it is calcined in the air at 450°C for 2h;

[0028] 2. Au nanoparticle modification: the adsorption-photoreduction method was used to treat TiO 2 The nanowires were modified with Au nanoparticles, and the gold source was chloroauric acid solution with a concentration...

Embodiment 3

[0033] Au / TiO 2 The preparation method of nanowire photocatalyst, the steps are as follows:

[0034] 1. TiO 2 Preparation of nanowires: Clean the titanium sheet with ethanol and pickle to remove the oil stain and oxide layer on the surface, then polish the surface of the titanium sheet with 1000-mesh sandpaper until the surface is uniform and smooth, and then oxidize it by anodic oxidation , the electrolyte is an ethylene glycol solution of water, the content of water is 4.5% (v / v), the content of ammonium fluoride is 0.5wt%, and the step-up method is adopted, and the boosting speed is 1 volt every 2 seconds , the highest voltage is 60V, the anodic oxidation treatment time is 2.5h, and after the oxidation treatment, it is calcined in the air at 490°C for 1h;

[0035] 2. Au nanoparticle modification: the adsorption-photoreduction method was used to treat TiO 2 The nanowires were modified with Au nanoparticles, and the gold source was chloroauric acid solution with a concentr...

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Abstract

The invention discloses a preparation method of a TiO2 nanowire photocatalyst modified by Au nanoparticles. The preparation method comprises the following steps: performing ethanol washing and acid washing on a titanium sheet respectively to remove surface greasy dirt and an oxidation layer, polishing the surface till the surface is uniform and smooth, performing oxidation treatment by an anodic oxidation method, performing anodic oxidation treatment by adopting a stepwise pressure-increasing method, and calcining in air after oxidation treatment; and modifying TiO2 nanowires with the Au nanoparticles by adopting an adsorption-photoreduction method, immersing the TiO2 nanowires into a chloroauric acid solution, illuminating by an ultraviolet lamp while stirring, washing with deionized water after treatment and drying. According to the preparation method disclosed by the invention, the photocatalytic activity is relatively high under irradiation of simulated sunlight, and the utilization of visible light is improved; furthermore, the preparation method is simple and the reaction is convenient to control; and as the immobilized photocatalyst, the separation from water is convenient, the new pollution is avoided, organic pollutants in a water body are removed, and the photocatalyst has good stability and reusability.

Description

technical field [0001] The invention relates to a method for preparing a photocatalyst, in particular to a TiO modified with Au nanoparticles 2 Preparation method of nanowire photocatalyst. Background technique [0002] Because semiconductor photocatalysts have some superior properties in the field of environmental pollution control, they have attracted the interest of researchers in recent decades. TiO 2 Photocatalysts have perfect photocatalytic properties, stable chemical properties, and no toxicity, and are considered to be an ideal material for producing clean energy and environmental governance. TiO 2 Nanostructures, such as nanotubes, nanowires, quantum dots, and nanofibers, have attracted a great deal of research interest due to their special properties in photocatalytic applications. TiO 2 The geometric shape of a photocatalyst plays a crucial role in its photocatalytic performance. A photocatalyst with a perfect shape can increase the accessible surface area, ...

Claims

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Application Information

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IPC IPC(8): B01J23/52C02F1/30
Inventor 陈清华辛言君
Owner QINGDAO AGRI UNIV
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