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Preparation method for molybdenum-doped nanometer titanium dioxide catalyst

A nano-titanium dioxide and photocatalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of long preparation cycle and save cost and time , Uniform particle size, strong adsorption effect

Active Publication Date: 2017-02-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still needs to adjust the pH value, and it needs to be aged for 1 to 3 days before drying, and the preparation cycle is longer.

Method used

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  • Preparation method for molybdenum-doped nanometer titanium dioxide catalyst
  • Preparation method for molybdenum-doped nanometer titanium dioxide catalyst
  • Preparation method for molybdenum-doped nanometer titanium dioxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Measure 10ml of tetrabutyl titanate and dissolve it in 50ml of absolute ethanol;

[0044] (2) Add 0.025g of molybdenum powder (fineness of molybdenum powder 2 μm) in the above solution;

[0045] (3) 10 ml of ammonia water with a concentration of 25% by mass was added to the above solution within 3 seconds at one time, and the butyl titanate was rapidly hydrolyzed and stirred vigorously to make the mixture uniform, and a white gel was obtained;

[0046] (4) Put the white gel into a drying oven, dry it at 60°C for 10 hours, and then grind it into powder;

[0047] (5) Put the above powder in a muffle furnace for calcination at 550° C. for 2 hours to obtain a titanium dioxide photocatalyst doped with molybdenum powder.

[0048] The product obtained by the reaction of step (5) is characterized by its structure and crystal form by SEM and XRD respectively, and the morphology of the titanium dioxide nano-microspheres obtained by this reaction condition is as follows figu...

Embodiment 2

[0056] (1) Measure 10ml of tetrabutyl titanate and dissolve it in 50ml of absolute ethanol;

[0057] (2) Add 0.025g of molybdenum powder (fineness of molybdenum powder 2 μm) in the above solution;

[0058] (3) Put 10 ml of ammonia water with a mass percentage concentration of 25% in the above solution within 3 seconds, quickly hydrolyze the butyl titanate and stir vigorously to make the mixture uniform;

[0059] (4) Put the precipitate into a drying oven, dry it at 60°C for 12 hours, and then grind it into powder;

[0060] (5) Put the above powder in a muffle furnace for calcination at 650° C. for 2 hours to obtain a titanium dioxide photocatalyst doped with molybdenum powder.

[0061] The product obtained by the reaction of step (5) is carried out in an adsorption detection experiment:

[0062] Measure 25ml of methylene blue (MB) solution with a concentration of 10mg / l and place it in a quartz test tube, weigh 25mg of titanium dioxide sample and add it to the quartz test tu...

Embodiment 3

[0066] (1) Measure 10ml of tetrabutyl titanate and dissolve it in 50ml of absolute ethanol;

[0067] (2) Add 0.035g of molybdenum powder (fineness of molybdenum powder 2 μm) in the above solution;

[0068] (3) Put 10 ml of ammonia water with a mass percentage concentration of 25% in the above solution within 3 seconds, quickly hydrolyze the butyl titanate, stir vigorously to mix evenly, and obtain a white gel;

[0069] (4) Put the white gel into a drying oven, dry it at 60°C for 10 hours, and then grind it into powder;

[0070] (5) Put the above powder in a muffle furnace for calcination at 550° C. for 2 hours to obtain a titanium dioxide photocatalyst doped with molybdenum powder.

[0071] The product obtained by the reaction of step (5) is subjected to an adsorption detection experiment similar to that of Example 2,

[0072] The absorbance spectrum of the dark reaction for 1 h is as follows: Figure 10 shown.

[0073] The product obtained by step (5) reaction is carried ...

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Abstract

The invention especially relates to a preparation method for a molybdenum-doped nanometer titanium dioxide catalyst, belonging to the technical field of semiconductor nano-materials. The preparation method comprises the following steps: dissolving a titanium-containing compound used as a precursor in anhydrous lower alcohol; doping metallic molybdenum powder into a solution obtained in the previous step; then rapidly adding ammonia water so as to allow the titanium-containing compound to undergo hydrolysis and condensation polymerization so as to obtain titanium / molybdenum gel; and successively carrying out drying, cooling, grinding into powder and calcining so as to obtain the molybdenum-doped nanometer titanium dioxide catalyst. The preparation method rapidly and easily prepares the titanium dioxide photocatalyst with good adsorption performance and catalytic activity without adjustment of a pH value.

Description

technical field [0001] The invention relates to the technical field of semiconductor nanomaterials, in particular to a method for preparing a molybdenum-doped nano-titanium dioxide catalyst. Background technique [0002] Photocatalyst is a general term for chemical substances that can play a catalytic role under the excitation of photons. Photocatalytic technology has become an ideal environmental pollution control technology and clean energy because of its uniqueness that it can directly use solar energy as a light source to drive reactions. production technology. Among them, the semiconductor photocatalytic material titanium dioxide (TiO 2 ) has attracted great attention due to its high activity, good stability, low price and non-toxicity. However, the photocatalytic activity of titania is affected by the photogenerated charge-hole recombination rate. Generally speaking, the smaller the particle size, the larger the specific surface area and the better the adsorption pe...

Claims

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Application Information

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IPC IPC(8): B01J23/28
Inventor 诸葛飞李振超吴爱国曾乐勇沈折玉徐裕梁凌燕曹鸿涛
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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