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Ternary nanocomposite Au/RGO-TiO2 nanotube array as well as preparation method and application thereof

A technology of nanocomposite materials and nanotube arrays, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of inability to make full use of natural sunlight, inability to form nanotube structures, and insufficient specific surface area, etc., to achieve Excellent photocatalytic efficiency and repeated recycling efficiency, improved photoelectric conversion efficiency, increased specific surface area and adsorption capacity

Inactive Publication Date: 2012-12-19
HUNAN UNIV
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Problems solved by technology

However, the applied anodic oxidation voltage is generally only in the range of 10-25V, beyond this voltage range, the nanotube-like structure cannot be formed, which limits the diameter of the nanotube to a certain extent, and the nanotubes prepared in the aqueous solution system The tube wall is thin and easy to break
200410021589.X discloses a preparation method of titanium dioxide nanotube arrays with a high aspect ratio. The solute of the electrolyte is fluoride and supporting electrolyte, the solvent is water, and alcohol additives are added. This kind of nanotube is still relatively short, only 250 nanometers long, the specific surface area is not large enough, and it can only absorb light in the ultraviolet region, so it cannot make full use of natural sunlight.

Method used

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  • Ternary nanocomposite Au/RGO-TiO2 nanotube array as well as preparation method and application thereof
  • Ternary nanocomposite Au/RGO-TiO2 nanotube array as well as preparation method and application thereof
  • Ternary nanocomposite Au/RGO-TiO2 nanotube array as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0020] (l) Grind the surface of the base material and clean it for later use;

[0021] (2) Preparation of inorganic electrolyte: the electrolyte is composed of sodium fluoride and sodium bisulfate solution with a mass percentage of HF of 0.5-3%;

[0022] (3) Under 25-100V DC voltage, using pure titanium or titanium alloy as the anode and platinum sheet as the cathode, electrolytically prepare titanium oxide nanotubes in the electrolyte;

[0023] (4) Calcinate the titanium oxide nanotube array prepared above under aerobic conditions at 400°C-500°C for 4-6h to crystallize it into TiO 2 array of nanotubes.

[0024] (5) Preparation of Au / RGO co-modified titania nanotube arrays:

[0025] The graphite oxide suspension (10mL 0.5mg mL -1 ) and chloroauric acid solution (1mL 5mmol / L) were magnetically stirred for ten minutes under ice-water bath conditions until the solution was uniformly mixed, and then the above TiO 2 Nanotube arrays were placed in a mixed solution of graphite ox...

Embodiment 2

[0027] Au / RGO-TiO 2 Photocatalytic degradation performance and stability of nanotube arrays for methyl orange

[0028] The inventors used TiO 2 Nanotube arrays and TiO modified with Au and graphene 2 Nanotube arrays were used to degrade 20mg / L simulated methyl orange (Methyl Orange, MO) wastewater. Implementation steps:

[0029] (1) Au / RGO-TiO with an effective electrode area of ​​3cm×3cm 2 The composite nanotube array electrode was immersed in 40mL simulated methyl orange wastewater with a concentration of 20mg / L;

[0030] (2) Use a Xe lamp with a light source of 500W (100mW / cm 2 ), simulating sunlight to photocatalytically degrade it;

[0031] (3) After regular sampling, use a UV-visible spectrophotometer to monitor the changes in the concentration of methyl orange in the solution;

[0032] (4) Control experiment on unmodified TiO 2 On the nanotube array, the steps are the same as above.

[0033] (5) Material stability test: take Au / RGO-TiO with an effective area of...

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Abstract

The invention discloses a ternary nanocomposite Au / RGO-TiO2 nanotube array as well as a preparation method and application thereof. A graphene film and nano gold particles are modified on the surface of a titanium dioxide nanotube array; and the nano gold particles are also modified and distributed on the inner pipe wall and the outer pipe wall of the titanium dioxide nanotube array. By the ternary nanocomposite Au / RGO-TiO2 nanotube array as well as the preparation method and the application thereof, the adsorption capability and the electron conduction capability of the titanium dioxide nanotube array are further enhanced, the absorption range of a visible light zone is widened, and the photoelectric conversion efficiency is improved.

Description

technical field [0001] The invention relates to a ternary nanocomposite material Au / RGO-TiO 2 Preparation methods and applications of nanotube arrays. Background technique [0002] Titanium dioxide nanotube arrays prepared by anodic oxidation have excellent characteristics such as large specific surface area and adjustable pore size. Its special nanotube-like structure has become a research hotspot in the scientific field of various countries. The electrolyte for preparing titanium dioxide nanotube arrays by anodic oxidation is usually an inorganic aqueous solution system. Since various ions migrate relatively fast in the aqueous solution, the electrochemical anodic oxidation is also fast, and nanotube arrays can be formed in a relatively short period of time. . However, the applied anodic oxidation voltage is generally only in the range of 10-25V, beyond this voltage range, the nanotube-like structure cannot be formed, which limits the diameter of the nanotube to a certai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D11/26B82Y30/00C02F1/30C02F1/58
CPCY02W10/37
Inventor 罗胜联陈瑶李玥刘承斌唐艳红王尧
Owner HUNAN UNIV
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