High-concentration molybdenum-doped tungsten trioxide photocatalytic nano material and preparation method and application thereof

A technology of tungsten trioxide and nanomaterials, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve low photocatalytic efficiency and reduce electron-hole recombination Insufficient utilization rate and solar light utilization rate, etc., to achieve the effect of improving utilization rate, enhancing absorption width, and improving efficiency

Pending Publication Date: 2020-09-04
曾妮婷
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Problems solved by technology

[0006] The purpose of the present invention is to provide a high-concentration molybdenum-doped photocatalyst in order to overcome the problems in the prior art that the traditional photocatalytic material titanium dioxide has insufficient sunlight utilization rate and the high electron-hole recombination rate of pure tungsten trioxide leads to low photocatalytic efficiency. A heterogeneous tungsten trioxide photocatalytic nanomaterial and its preparation method and application. The high-concentration molybdenum-doped tungsten trioxide photocatalytic nanomaterial prepared by this method has an adjustable doping ratio, which can reduce electron holes in the original tungsten trioxide material. Recombination rate, enhance the absorption width of the solar spectrum in the photocatalytic reaction, improve the utilization rate of sunlight in the photocatalytic reaction, and improve the efficiency of photocatalytic degradation of organic matter

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  • High-concentration molybdenum-doped tungsten trioxide photocatalytic nano material and preparation method and application thereof
  • High-concentration molybdenum-doped tungsten trioxide photocatalytic nano material and preparation method and application thereof
  • High-concentration molybdenum-doped tungsten trioxide photocatalytic nano material and preparation method and application thereof

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preparation example Construction

[0034] One aspect of the present invention provides a method for preparing a high-concentration molybdenum-doped tungsten trioxide photocatalytic nanomaterial, the method comprising the following steps:

[0035] (1) Reaction of molybdenum hexacarbonyl and tetraethylthiuram disulfide to obtain molybdenum precursor MoL 4 ;

[0036] (2) React ammonium tetrathiotungstate and sodium diethyldithiocarbamate to obtain tungsten precursor WS(S 2 ) L 2 ;

[0037] (3) Mix molybdenum precursor and tungsten precursor, then heat for pyrolysis reaction, and obtain nano-doped powder material Mo after cooling 1-x W x o 3 (0.25≤x≤0.75);

[0038] (4) Optionally, the nano-doped powder material Mo 1-x W x o 3 (0.25≤x≤0.75) Ultrasound and centrifugation to obtain high-concentration molybdenum-doped tungsten trioxide nano-solution or suspension Mo 1-x W x o 3 (0.25≤x≤0.75);

[0039] Among them, MoL 4 and WS(S 2 ) L 2 L in is S 2 CN(C 2 h 5 ) 2 .

[0040] The present invention prepa...

Embodiment 1

[0061] Compound A and compound B were mixed according to molybdenum / tungsten molar ratio of 1:3, put into a tube furnace and heated to 500°C, the whole reaction was kept in the air environment for 1 hour, then cooled to room temperature and the reaction product was collected to obtain the molecular formula For Mo 0.25 W 0.75 o 3 nano-doped materials.

[0062] The scanning electron microscope image and corresponding energy spectrum image of the nano-doped material prepared in this example, the ultra-high resolution scanning transmission electron microscope image and its corresponding nanoparticle size distribution, Raman spectrum and X-ray diffraction image, photocatalytic degradation of formazan Degradation photo of base orange as Figure 3-6 shown.

Embodiment 2

[0064] Compound A and compound B were mixed according to the molybdenum / tungsten molar ratio of 1:1, put into a tube furnace and heated to 450°C, the whole reaction was kept in the air environment for 4 hours, then cooled to room temperature and the reaction product was collected to obtain the molecular formula For Mo 0.5 W 0.5 o 3 nano-doped materials.

[0065] The scanning electron microscope image and corresponding energy spectrum image of the nano-doped material prepared in this example, the ultra-high resolution scanning transmission electron microscope image and its corresponding nanoparticle size distribution, Raman spectrum and X-ray diffraction image, photocatalytic degradation of formazan Degradation photo of base orange as Figure 3-6 shown.

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Abstract

The invention relates to the technical field of preparation of photocatalytic nano materials, and discloses a high-concentration molybdenum-doped tungsten trioxide photocatalytic nano material and a preparation method and application thereof. The method comprises the following steps: (1) reacting molybdenum hexacarbonyl with tetraethylthiuram disulfide to obtain a molybdenum precursor MoL4; (2) carrying out a reaction on ammonium tetrathiotungstate and sodium diethyldithiocarbamate to obtain a tungsten precursor WS (S2) L2; (3) mixing the molybdenum precursor and the tungsten precursor, then heating for pyrolytic reaction, and cooling to obtain a nano-doped powder material; and (4) optionally, carrying out ultrasonic treatment and centrifugation on the nano-doped powder material to obtaina high-concentration molybdenum-doped tungsten trioxide nano solution or suspension. According to the high-concentration molybdenum-doped tungsten trioxide photocatalytic nano material prepared by themethod, the absorption width of the nano material to a solar spectrum in a photocatalytic reaction can be increased so that the utilization rate of the photocatalytic reaction to sunlight is increased.

Description

technical field [0001] The invention relates to the technical field of photocatalytic nanomaterial preparation, in particular to a high-concentration molybdenum-doped tungsten trioxide photocatalytic nanomaterial and its preparation method and application. Background technique [0002] In the past decade, transition metal oxides (TMOs) and their nanoscale doping have attracted extensive attention. Molybdenum trioxide and tungsten trioxide are wide bandgap semiconductors (3.0-3.2eV), which have been widely studied and applied in gas sensing, photocatalysis, electrochromic and photochromic properties. However, the doping concentration has been limited by the fabrication method itself, and heterogeneous thin films have been reported as a challenge encountered in the production process. Therefore, controllable synthesis techniques are of great significance for the design of crystal structures and doping at the atomic level, as well as the ability for their industrial applicatio...

Claims

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Application Information

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IPC IPC(8): B01J23/30C02F1/30C02F101/30
CPCB01J23/30C02F1/30C02F2305/10C02F2101/40B01J35/39
Inventor 曾妮婷
Owner 曾妮婷
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