Preparation of nano cadmium tantalite photocatalyst

A photocatalyst, nano-tantalum technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor product particle size and uniformity, catalyst sintering and agglomeration , easy to introduce impurities and other problems, to achieve the effect of narrowing the band gap, good photocatalytic water splitting performance, and improving the photocatalytic reaction activity

Active Publication Date: 2008-09-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size and uniformity of the product prepared by this method are poor, and impurities are easily introduced. Excessive temperature during the calcination process will easily cause sintering and agglomeration of the catalyst, thereby reducing the catalytic performance.

Method used

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  • Preparation of nano cadmium tantalite photocatalyst
  • Preparation of nano cadmium tantalite photocatalyst
  • Preparation of nano cadmium tantalite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, 1) at first, in the water bath of 50 ℃, the cadmium nitrate tetrahydrate of the tantalum pentachloride of 0.01mol and 0.01mol is dissolved in the dehydrated alcohol of 40g, then, the polyethylene glycol of 20g (6000) is dissolved in the dehydrated alcohol of 40g;

[0028] 2) Next, mix the above two solutions under magnetic stirring, and evaporate the solvent in a water bath at 90°C to obtain a transparent sol;

[0029]3) Place the obtained sol in an oven at 150°C, air-dry it to obtain a xerogel, and then grind it to obtain a light yellow precursor powder;

[0030] 4) The precursor powder is placed in a muffle furnace, calcined at 450°C for 5 hours, the dispersant polyethylene glycol is removed, the temperature is lowered to room temperature, and the gray powder is obtained;

[0031] 5) The gray powder is placed in a muffle furnace, calcined at 900° C. for 2 hours, and then naturally lowered to room temperature to obtain a white nano-cadmium tantalate phot...

Embodiment 2

[0032] Embodiment 2, 1) at first, in the water bath of 70 ℃, the cadmium nitrate tetrahydrate of the tantalum pentachloride of 0.01mol and 0.01mol is dissolved in the dehydrated alcohol of 30g, then, the polyethylene glycol of 18g (6000) was dissolved in 30g of absolute ethanol;

[0033] 2) Next, mix the above two solutions under magnetic stirring, and evaporate the solvent in a water bath at 70°C to obtain a transparent sol;

[0034] 3) Place the obtained sol in an oven at 120°C, air-dry it to obtain a xerogel, and then grind it to obtain a light yellow precursor powder;

[0035] 4) The precursor powder is placed in a muffle furnace, calcined at 300°C for 6 hours, the dispersant polyethylene glycol is removed, the temperature is lowered to room temperature, and the gray powder is obtained;

[0036] 5) The gray powder is placed in a muffle furnace, calcined at 900° C. for 5 hours, and then naturally lowered to room temperature to obtain a white nano-cadmium tantalate photocat...

Embodiment 3

[0037] Embodiment 3, 1) at first, in the water bath of 60 ℃, the cadmium nitrate tetrahydrate of the tantalum pentachloride of 0.01mol and 0.01mol is dissolved in the dehydrated alcohol of 25g, then, the polyethylene glycol of 25g (6000) is dissolved in the dehydrated alcohol of 25g;

[0038] 2) Next, mix the above two solutions under magnetic stirring, and evaporate the solvent in a water bath at 100°C to obtain a transparent sol;

[0039] 3) Place the obtained sol in an oven at 100°C, air-dry it to obtain a xerogel, and then grind it to obtain a light yellow precursor powder;

[0040] 4) Place the precursor powder in a muffle furnace, calcinate at 500°C for 4 hours, remove the dispersant polyethylene glycol, cool down to room temperature, take it out and grind it, and obtain a gray powder;

[0041] 5) The gray powder is placed in a muffle furnace, calcined at 900° C. for 3 hours, and then cooled down to room temperature naturally to obtain a white nano-cadmium tantalate pho...

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Abstract

A method for preparing cadmium tantalate nanoparticle photocatalysts is provided. The method includes the following steps: dissolving tantalum pentachloride and cadmium nitrate tetrahydrate in anhydrous alcohol and then dissolving polyethylene glycol in anhydrous alcohol; mixing the solutions under magnetic stirring, and evaporating solvents in a water bath to obtain a transparent sol; placing the transparent sol in an oven, fan-drying to obtain a dry sol, and grinding to obtain a flavescent precursor powder; calcining the precursor powder in a muffle furnace to obtain a gray powder; calcining the gray powder in the muffle furnace; and naturally cooling down to room temperature to obtain white cadmium tantalate nanoparticle photocatalyst. The invention utilizes the cadmium element instead of alkali metal and alkaline earth metal elements. The energy band structure and state density calculation show that the valence band of the photocatalyst is mainly formed by 02p orbital, the conduction band thereof is formed by Ta 5d, 02p and Cd 5s5p hybrid orbits, the band gap is minimized, Ta and Cd orbits are used together as reaction points to enhance the photocatalytic activity.

Description

technical field [0001] The invention relates to hydrogen energy photocatalytic clean preparation technology in the field of hydrogen energy preparation, in particular to a preparation method of cadmium tantalate photocatalyst. Background technique [0002] At present, with the acceleration of technology and industrialization, problems such as insufficient supply of conventional energy, shortage of liquid fuel, and serious pollution caused by the use of fossil energy have become increasingly prominent, prompting people to look for new clean alternative energy. The basic theoretical research on the conversion and utilization of renewable energy, and the development of efficient and low-cost renewable energy high-quality conversion and large-scale utilization technologies have become the most urgent tasks in the field of energy technology in my country. my country has extremely rich renewable energy resources with huge development potential. However, due to the low energy dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01J23/06C01B3/04
CPCY02E60/364Y02E60/36
Inventor 郭烈锦刘秀如杨鸿辉周朝晖
Owner XI AN JIAOTONG UNIV
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