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Preparation method of high-activity platinum-loaded TiO2 nanotube photocatalyst

A photocatalyst and nanotube technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as reducing catalyst adsorption and ultraviolet light absorption, and avoid bed effects and photocatalytic efficiency. Improve and improve the effect of photon quantum efficiency

Inactive Publication Date: 2010-07-14
NANJING UNIV OF SCI & TECH
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

However, the platinum-loaded TiO prepared by this method 2 The platinum particles on the nanotubes are distributed on the inner and outer surfaces of the nanotubes, and the platinum particles on the outer surface will occupy the adsorption active sites, which will reduce the catalyst's adsorption of reactants and absorption of ultraviolet light, and its application is still limited.

Method used

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  • Preparation method of high-activity platinum-loaded TiO2 nanotube photocatalyst
  • Preparation method of high-activity platinum-loaded TiO2 nanotube photocatalyst

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[0014] Highly active platinum-loaded TiO of the present invention 2 The preparation method of nanotube photocatalyst is in the obtained anatase TiO 2 On the basis of nanotubes, the noble metal platinum is selectively deposited on the inner surface of nanotubes by photoreduction deposition method to obtain platinum-loaded TiO with high photocatalytic activity. 2 Nanotube photocatalyst, i.e. platinum-loaded TiO 2 nanotube photocatalyst, is on anatase TiO 2 A highly efficient photocatalyst prepared by depositing platinum on the inner surface of nanotubes. Anatase TiO 2 The nanotubes were synthesized by hydrothermal method, and intermittent milling steps were introduced in the hydrothermal synthesis process to obtain TiO with high purity 2 nanotubes, which are calcined to obtain anatase TiO 2 nanotubes; TiO 2 The platinum on the inner surface of the nanotube is prepared by photoreduction deposition. It mainly includes the following steps:

[0015] (1) Add 1~10gTiO to 10mol...

Embodiment 1

[0022] Weigh 1gTiO 2 Powder, add 40mL of 10mol / L NaOH solution, hydrothermally react in the reactor at 150°C for 5h, then cool to room temperature, grind the solid in the reactor, and then continue to react at the same temperature for 48h to obtain After cooling the sample, adjust the pH value of the mixed solution to 2.5 with hydrochloric acid, pickle it with stirring for 3 hours, wash it with distilled water until it is neutral, then dry it, and then roast it at 500°C for 5h (heating rate: 1°C / min) to obtain Anatase TiO 2 nanotube.

[0023] Anatase TiO 2 Nanotubes as the matrix, add chloroplatinic acid, stir to make it evenly adsorbed on TiO 2 The inner and outer surfaces of the nanotubes are then washed with distilled water to remove the chloroplatinic acid adsorbed on the outer surfaces of the nanotubes, and the amount of platinum loaded on the inner surface of the nanotubes is controlled to be 0.57%, and dried to obtain platinum-loaded TiO 2 Nanotube precursors. Weig...

Embodiment 2

[0027] In Example 1, other conditions remained unchanged, the hydrothermal reaction temperature was changed to 110°C, and the obtained platinum-loaded TiO 2 The removal rate of nanotube photocatalyst to rhodamine B solution is lower than that of Example 1.

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Abstract

The invention discloses a preparation method of a platinum-loaded TiO2 nanotube photocatalyst with high-efficiency photocatalysis activity, which is characterized by comprising the following steps of: taking low-cost TiO2 and sodium hydroxide as raw materials; milling in the process of hydro-thermal reaction; then acid washing and roasting to obtain an anatase TiO2 nanotube as a carrier; enabling the inner surface of the anatase TiO2 nanotube to absorb chloroplatinic acid; and enabling the inner surface of the nanotube to be loaded with platinum particles by taking ethanol as a hole depletion agent by adopting a photo-reduction settling method. The light quantum efficiency is improved on the premise that the adsorption capacity for pollutants is not influenced. Compared with common TiO2 photocatalysts, the platinum-loaded TiO2 nanotube catalyst has higher photocatalysis activity.

Description

technical field [0001] The invention belongs to the preparation technology of photocatalyst, especially a kind of highly active platinum-loaded TiO 2 Preparation method of nanotube photocatalyst. Background technique [0002] Photocatalytic technology is a kind of advanced oxidation technology (AOPs), which has received extensive attention in recent years in the treatment of organic wastewater, especially high-concentration and refractory wastewater. The main principle is based on the fact that under the irradiation of ultraviolet light, the valence band and conduction band of the photocatalyst respectively generate highly active hole-electron pairs. Being oxidized, electron acceptors are reduced by accepting electrons from the surface. The technology has no selectivity to the degraded pollutants and does not produce secondary pollution. [0003] Photocatalyst is an important factor affecting photocatalytic efficiency. Commonly used TiO 2 The small specific surface area...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J21/06B01J37/08B01J37/16C02F1/32A62D3/176A62D101/28C02F101/38
Inventor 江芳周菊霞安立超孙秀云郑寿荣许昭怡
Owner NANJING UNIV OF SCI & TECH
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