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Preparation method of superfine cadmium sulfide particles-sensitized titanium dioxide nanotube array

A nanotube array and titanium dioxide technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve problems such as poor repeatability, large CdS particles, and reduced contact area, so as to increase the effective contact area and photoelectric conversion High efficiency, increase the effect of charge transfer

Inactive Publication Date: 2012-09-19
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is very simple, it has poor reproducibility and weak binding force, and the obtained CdS particles are usually large and easy to agglomerate at the mouth of titanium dioxide nanotubes, thereby reducing the contact area between the two, resulting in weakened visible light absorption and charge separation and transmission effects. become worse

Method used

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  • Preparation method of superfine cadmium sulfide particles-sensitized titanium dioxide nanotube array
  • Preparation method of superfine cadmium sulfide particles-sensitized titanium dioxide nanotube array
  • Preparation method of superfine cadmium sulfide particles-sensitized titanium dioxide nanotube array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) The base material is a titanium sheet with a thickness of 0.3 mm, which is ultrasonically cleaned in acetone, ethanol and deionized water, and dried in the air for use. Prepare 0.2M NH 4 F and 0.1M H 3 PO 4 solution, using Ti sheet as the working electrode and Pt sheet as the counter electrode, anodizing at a control voltage of 20V for 7h, ultrasonic cleaning for 1min, drying, and roasting in a muffle furnace at 500°C for 2h to obtain anatase TiO 2 -NTs films.

[0021] (2) TiO2 nanotube arrays sensitized by ultrafine cadmium sulfide particles were prepared by electrodeposition combined with ion exchange. Place the sample obtained in step (1) in CdCl 2 Ultrasound in the solution for 6min, with 0.2M CdCl 2 For the electrolyte, TiO 2 -NTs is the working electrode, the Pt sheet is the counter electrode, the saturated calomel electrode (SCE) is the reference electrode, and the Cd / TiO 2 -NTs, then calcined in a muffle furnace at 500 °C for 1 h, and finally at 140 °...

Embodiment 2

[0023] (1) TiO 2 - The preparation of the NTs film is the same as in Example 1.

[0024] (2) Place the sample obtained in step (1) in CdCl 2 Ultrasound in the solution for 6min, with 0.2M CdCl 2 For the electrolyte, TiO 2 -NTs is the working electrode, the Pt sheet is the counter electrode, and the saturated calomel electrode (SCE) is the reference electrode. Cd / TiO is obtained by electrodeposition for 60s by controlling the potential (0.9V vs. 2 -NTs, then calcined in a muffle furnace at 500 °C for 1 h, and finally at 140 °C in 0.2 M Na 2 Perform ion exchange in S solution for 10h to obtain CdS / TiO 2 -NTs.

Embodiment 3

[0026] (1) TiO 2 - The preparation of the NTs film is the same as in Example 1.

[0027] (2) Place the sample obtained in step (1) in CdCl 2 Ultrasound in the solution for 6min, with 0.2M CdCl 2 For the electrolyte, TiO 2 -NTs is the working electrode, the Pt sheet is the counter electrode, the saturated calomel electrode (SCE) is the reference electrode, and the Cd / TiO 2 -NTs, then calcined in a muffle furnace at 500 °C for 1 h, and finally at 140 °C in 0.2 M Na 2 Perform ion exchange in S solution for 15h to obtain CdS / TiO 2 -NTs.

[0028] from figure 1 It can be seen that the ultrafine CdS particles obtained in the experiment are not only highly dispersed in TiO 2 The nozzles of the nanotube array are distributed in the nanotubes.

[0029] Such as figure 2 shown, from TiO 2 -NTs and 30s-CdS / TiO 2 - The XRD pattern of NTs samples can only see only Ti substrate and anatase TiO 2 The diffraction peaks of CdS appear when the electrodeposition time is increased to 60s...

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Abstract

The invention discloses a preparation method of a superfine cadmium sulfide particles-sensitized titanium dioxide nanotube array, comprising the following steps of: 1) pretreating the surface of a substrate material, carrying put anodic oxidation to obtain pure TiO2-NTs by taking mixed solution of NH4F and H3PO4 as electrolyte, taking a Ti slice as a working electrode Pt slice and a counter electrode,, and roasting an obtained sample, to obtain an anatase type TiO2-NTs thin film; and 2) ultrasonically treating the sample obtained in the step 1), carrying out electro-deposition by taking CdCl2 as electrolyte to obtain Cd / TiO2-NTs, carrying out roasting and thermal oxidation to obtain CdO, carrying out ion exchange in Na2S solution, and withdrawing to obtain CdS / TiO2-NTs. In combination with the electro-deposition and the ion exchange, the superfine CdS particles are evenly dispersed at the tube opening of the TiO2 nanotube array and in the tube, so that the effective contact area between the CdS particles and the TiO2 nanotube array can be increased, therefore, the charge transfer among interfaces can be increased, the photoelectric conversion efficiency is higher, and the activity of the photo-electrically and catalytically degraded organic pollutants can be improved.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide nanotube array, in particular to a preparation method of a titanium dioxide nanotube array sensitized by ultrafine cadmium sulfide particles. technical background [0002] In recent years, research reports on the application of titanium dioxide in the photocatalytic degradation of organic pollutants have been increasing. Titanium dioxide nanotube arrays (TiO 2 -NTs) have aroused widespread interest due to their novel properties such as large specific surface area, strong light absorption, and excellent charge percolation pathway (Yang, L., Luo, S., Cai, Q., Yao, S., Chin . Sci. Bull. 2010, 55, 331-338. Roy, P., Berger, S., Schmuki, P., Angew. Chem. Int. Ed. 2011, 50, 2904-2939.). However TiO 2 As a photocatalyst, the band gap is 3.2eV, and the light absorption is limited to the ultraviolet region, and can only absorb and utilize 5% of the ultraviolet light in sunlight. Many researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C25D3/26C25D5/50
Inventor 李贵生吴玲蒋波张蝶青李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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