Method for preparing metal-rhodium nanoparticle modified titanium dioxide nanotube array photocatalytic material

A nanoparticle modification, nanotube array technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problem of reducing the photocatalytic efficiency of semiconductor materials and limiting solar energy. Light utilization, low quantum efficiency and other problems, to achieve the effect of good photocatalytic performance, short reaction time, and improved photocatalytic performance

Inactive Publication Date: 2017-12-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Titanium dioxide nanotube semiconductor materials have attracted much attention because of their photocatalytic properties, but there are two shortcomings in practical applications: 1. TiO 2 The forbidden band width is 3.2eV, which is relatively wide. Basically, it can only be excited by photons with a wavelength of less than 386nm, so the range of spectral response is narrow. Light with a wavelength of less than 386nm only accounts for 3%-4% of solar energy, which limits Improve the utilization of sunlight; Second, the quantum efficiency is low, because in TiO 2 The migration rate of photogenerated electrons is slow, while the oxidation rate of holes is very fast, and they are often accumulated in the conduction band. The accumulation of photogenerated electrons increases the probability of recombination with photogenerated holes, which will reduce the TiO 2 Photocatalytic Efficiency of Semiconductor Materials
In the past, the deposition-precipitation method was used to load metal nanoparticles. This method is not fully applicable to the loading of metal rhodium nanoparticles on TiO. 2 nanotube array material

Method used

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  • Method for preparing metal-rhodium nanoparticle modified titanium dioxide nanotube array photocatalytic material
  • Method for preparing metal-rhodium nanoparticle modified titanium dioxide nanotube array photocatalytic material
  • Method for preparing metal-rhodium nanoparticle modified titanium dioxide nanotube array photocatalytic material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of metal rhodium nanoparticles modified TiO 2 Nanotube array photocatalytic material, the steps are as follows:

[0035] Step 1: Mechanically polish the titanium sheet, and then perform ultrasonic cleaning.

[0036] Step 2, dissolving 1.76g of ammonium fluoride solute in a mixed solution consisting of 100mL and 200mL, and fully stirring for 2h to obtain an electrolyte used in the anodic oxidation reaction.

[0037] Step 3, then use the pretreated titanium sheet as the anode material, the platinum sheet as the cathode material, apply an applied voltage of 20v, and oxidize for 4h to obtain amorphous TiO 2 Nanotube array material, and then annealed to obtain anatase phase TiO 2 Nanotube Array Materials.

[0038] Step four, the TiO 2 The nanotube array material was placed in a rhodium nitrate solution with a concentration of 0.002mol / L, soaked at a constant temperature of 70°C for 8 hours, and washed 3 times with deionized water after soaking

[0039] Step ...

Embodiment 2

[0043] Preparation of metal rhodium nanoparticles modified TiO 2 Nanotube array photocatalytic material, the steps are as follows:

[0044] Step 1: Mechanically polish the titanium sheet, and then perform ultrasonic cleaning.

[0045] Step 2, dissolving 1.76g of ammonium fluoride solute in a mixed solution consisting of 100mL and 200mL, and fully stirring for 4h to obtain an electrolyte used in the anodic oxidation reaction.

[0046] Step 3, then use the pretreated titanium sheet as the anode material, the platinum sheet as the cathode material, apply an applied voltage of 20v, and oxidize for 4h to obtain amorphous TiO 2 Nanotube array material, and then annealed to obtain anatase phase TiO 2 Nanotube Array Materials.

[0047] Step four, the TiO 2 The nanotube array material was placed in a rhodium nitrate solution with a concentration of 0.003mol / L, soaked at a constant temperature of 70°C for 8 hours, and washed 3 times with deionized water after soaking

[0048] Step ...

Embodiment 3

[0051] Preparation of metal rhodium nanoparticles modified TiO 2 Nanotube array photocatalytic material, the steps are as follows:

[0052] Step 1: Mechanically polish the titanium sheet, and then perform ultrasonic cleaning.

[0053] Step 2, dissolving 1.76g of ammonium fluoride solute in a mixed solution consisting of 100mL and 200mL, and fully stirring for 2h to obtain an electrolyte used in the anodic oxidation reaction.

[0054] Step 3, then use the pretreated titanium sheet as the anode material, the platinum sheet as the cathode material, apply an applied voltage of 20v, and oxidize for 4h to obtain amorphous TiO 2 Nanotube array material, and then annealed to obtain anatase phase TiO 2 Nanotube Array Materials.

[0055] Step four, the TiO 2 The nanotube array material was placed in a rhodium nitrate solution with a concentration of 0.004mol / L, soaked at a constant temperature of 70°C for 8 hours, and washed 3 times with deionized water after soaking

[0056] Step ...

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Abstract

The invention discloses a method for preparing a metal-rhodium nanoparticle modified titanium dioxide nanotube array photocatalytic material. The method comprises the following steps: pretreatment, anodic oxidation, metal rhodium particle loading and annealing. According to the method, the raw materials are simple and readily available; rhodium nitrate and ethylene glycol serve as the raw materials, the process flow is simple, and obtained rhodium nanoparticles are uniformly distributed on surfaces of nanotubes, are spherical and are uniform in particle size; and due to the action of a resonance effect of metal ions, the photocatalytic activity of a titanium dioxide nanotube material can be effectively improved by the loading of the rhodium nanoparticles.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide nanotube array photocatalytic material modified by metallic rhodium nanoparticles. Background technique [0002] Titanium dioxide nanotube semiconductor materials have attracted much attention because of their photocatalytic properties, but there are two shortcomings in practical applications: 1. TiO 2 The forbidden band width is 3.2eV, which is relatively wide. Basically, it can only be excited by photons with a wavelength of less than 386nm, so the range of spectral response is narrow. Light with a wavelength of less than 386nm only accounts for 3%-4% of solar energy, which limits Improve the utilization of sunlight; Second, the quantum efficiency is low, because in TiO 2 The migration rate of photogenerated electrons is slow, while the oxidation rate of holes is very fast, and they are often accumulated in the conduction band. The accumulation of photogenerated electrons increases ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J35/08B01J37/02B01J37/34B01J37/08C02F1/32C02F101/38C02F101/36
CPCB01J23/464B01J35/0013B01J35/004B01J35/006B01J35/0093B01J35/08B01J37/0205B01J37/0226B01J37/088B01J37/348C02F1/32C02F2101/36C02F2101/38C02F2101/40C02F2305/10
Inventor 刘保顺张玉博张瑞程凯赵修建
Owner WUHAN UNIV OF TECH
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