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Tungsten-nitrogen binary co-doped nanometer TiO2 photocatalyst and preparation method thereof

A photocatalyst and co-doping technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology, etc., can solve the problems of low photocatalytic efficiency and achieve improved photocatalytic activity, effective absorption, and bandgap width Reduced effect

Inactive Publication Date: 2012-07-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The object of the invention is to provide a kind of tungsten nitrogen (W, N) binary co-doped nano TiO 2 Photocatalyst and preparation method thereof, solve the problem of TiO in the prior art 2 load on WO 3 The range of the absorption spectrum is still mainly in the ultraviolet region, and the photocatalytic efficiency is not high under visible light.

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  • Tungsten-nitrogen binary co-doped nanometer TiO2 photocatalyst and preparation method thereof
  • Tungsten-nitrogen binary co-doped nanometer TiO2 photocatalyst and preparation method thereof
  • Tungsten-nitrogen binary co-doped nanometer TiO2 photocatalyst and preparation method thereof

Examples

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Embodiment 1

[0029] In this example, tungsten and nitrogen binary co-doped nano-TiO 2 The preparation method of the photocatalyst adopts the two-step method of sol-gel method and high-energy ball milling method to dope tungsten element and nitrogen element. In the first step, W-doped nano-TiO was prepared by sol-gel method 2 Photocatalyst; the second step, using mechanical alloying method (high-energy ball milling method) to incorporate nitrogen into W-doped nano-TiO 2 (W, N) binary co-doped nano-TiO in photocatalyst 2 Photocatalyst, and finally remove the incompletely reacted organic matter by heat treatment, and further treat TiO 2The photocatalyst is crystallized. details as follows:

[0030] In the first step, W-doped nano-TiO was prepared by sol-gel method 2 Photocatalyst, the specific operation steps are:

[0031] (1) First add 34mL tetrabutyl titanate into 88mL ethanol and stir for 30 minutes until the mixture is uniform;

[0032] (2) adding 1.4mL of concentrated nitric acid ...

Embodiment 2

[0043] The difference from Example 1 is that it is as follows:

[0044] In the first step, W-doped nano-TiO was prepared by sol-gel method 2 Photocatalyst, the specific operation steps are:

[0045] (1) First add 17mL tetrabutyl titanate into 44mL ethanol and stir for 30 minutes until the mixture is uniform;

[0046] (2) adding 0.7mL concentrated nitric acid with a concentration of 70wt% to adjust the pH value to 1.5 to obtain a uniform solution A;

[0047] (3) 3.6mL concentration of 5wt% Na 2 WO 3 The aqueous solution was added dropwise to Solution A under vigorous stirring to form a sol. Wherein, the amount of the tungsten inorganic salt solution is 0.5-10wt% based on the doping amount of tungsten element, which is 5wt% in this embodiment;

[0048] (4) After gelling the obtained sol at room temperature for 36 hours, drying at 70° C. for 36 hours to obtain a xerogel;

[0049] (5) Baking the xerogel in air at 500°C for 2 hours to obtain W-doped TiO 2 catalyst of light; ...

Embodiment 3

[0053] The difference from Example 1 is that it is as follows:

[0054] In the first step, W-doped nano-TiO was prepared by sol-gel method 2 Photocatalyst, the specific operation steps are:

[0055] (1) First add 51mL tetrabutyl titanate into 132mL ethanol and stir for 30 minutes until the mixture is uniform;

[0056] (2) Add 2.1mL of concentrated nitric acid with a concentration of 70wt% to adjust the pH value to 1.8 to obtain a uniform solution A;

[0057] (3) 10.8mL concentration of 3wt% Na 2 WO 3 The aqueous solution was added dropwise to Solution A under vigorous stirring to form a sol. Wherein, the dosage of the tungsten inorganic salt solution is 0.5-10wt% based on the doping amount of tungsten element, which is 3wt% in this embodiment;

[0058] (4) After gelling the obtained sol at room temperature for 24 hours, drying at 80°C for 48 hours to obtain a xerogel;

[0059] (5) Baking the xerogel in air at 400°C for 2 hours to obtain W-doped TiO 2 catalyst of light; ...

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Abstract

The invention belongs to the field of nano photocatalysis materials, and particularly relates to a tungsten-nitrogen (W, N) binary co-doped nanometer TiO2 photocatalyst and a preparation method thereof. In the method, the (W, N) binary co-doped nanometer TiO2 photocatalyst is synthesized by using a sol-gel method and a mechanical alloying method together, wherein the doping amounts of W and N can be adjusted and controlled. The (W, N)-TiO2 photocatalyst prepared with the preparation method disclosed by the invention has high visible light absorbing performance, an absorption band edge in a visible light region can extend to 650 nanometers, and the photon efficiency of a TiO2 material can be remarkably increased. Meanwhile, the (W, N) binary co-doped nanometer TiO2 photocatalyst has superior photocatalysis performance under visible light, which is superior to that of an internally-known TiO2 commodity P25. Due to the adoption of the (W, N) binary co-doped nanometer TiO2 photocatalyst, the problems that the range of an absorption spectrum is mainly in an ultraviolet light region when WO3 is loaded onto TiO2, and the like existing in the prior art can be solved, and the nano TiO2 photocatalyst with high light absorption performance and catalytic activity is obtained under visible light. The preparation method is easy, and has industrial prospect.

Description

technical field [0001] The invention belongs to the field of nanometer photocatalytic materials, in particular to a kind of nanometer TiO with tungsten nitrogen (W, N) binary co-doping and photocatalytic activity under visible light 2 Photocatalyst and its preparation method. Background technique [0002] TiO 2 Due to their excellent physical and chemical properties such as high photocatalytic efficiency, strong chemical stability, non-toxicity and low cost, photocatalysts have great potential application value in the fields of energy and environmental protection. At present, its applications in solar dye-sensitized cells (DSSC), self-cleaning materials, bactericidal materials, and environmental pollution control have begun to take shape. However, due to TiO 2 It is a semiconductor with wide bandgap, and only ultraviolet light with short wavelength and high energy can be absorbed by TiO 2 absorption, which greatly limits the TiO 2 wide application. In today's era of en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/00B01J21/06A62D3/10B82Y30/00B82Y40/00
Inventor 沈艳芳崔新宇熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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