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Preparing method for visible light response CdS/ (cal-Ta2O5-SiO2) composite photocatalyst

A cal-ta2o5-sio2, catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of small specific surface area of ​​raw materials, insufficient stability, and easy destruction of mesopores, etc. Achieve the effects of more active sites, slower recombination speed, and increased photocatalytic activity

Active Publication Date: 2018-01-05
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However 2 o 5 Raw materials are easy to aggregate and have a small specific surface area. How to improve the specific surface area is a research aspect that has attracted much attention.
Currently, most of the CdS and mesoporous Ta 2 o 5 Composite, but this method makes the mesopores easily destroyed and not stable enough
Therefore, how to choose a method to obtain a stable and efficient Ta 2 o 5 Composite photocatalytic materials with CdS are still a great challenge

Method used

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  • Preparing method for visible light response CdS/ (cal-Ta2O5-SiO2) composite photocatalyst
  • Preparing method for visible light response CdS/ (cal-Ta2O5-SiO2) composite photocatalyst
  • Preparing method for visible light response CdS/ (cal-Ta2O5-SiO2) composite photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1) Add ethyl silicate to the ethanol solution of ammonia water and mix well, stir for 14 hours, centrifuge, clean with absolute ethanol and deionized water, dry the product at 80 degrees, and grind the obtained silicon ball sample for backup use.

[0026] 2) TaCl 5 Dissolve in 50ml of ethanol-water (v / v=1:1) solution, adjust pH=4-6 with citric acid, the molar ratio of metal ion to citric acid is 1 / 2. After stirring at room temperature for 1-2 hours, add silicon spheres, stir for 3-8 hours, centrifuge, wash thoroughly with deionized water and absolute ethanol, and dry at 80°C for 14 hours to obtain the desired sample.

[0027] 3) TaCl 5 Dissolve in 50ml of ethanol-water (v / v=1:1) solution, adjust pH=4-6 with citric acid, the molar ratio of metal ion to citric acid is 1 / 2. After stirring at room temperature for 1-2 hours, add the sample prepared in the second step, stir for 3-8 hours, centrifuge, wash thoroughly with deionized water and absolute ethanol, and dry at 80°...

Embodiment 2

[0033] 1) Add ethyl silicate to the ethanol solution of ammonia water and mix well, stir for 14 hours, centrifuge, clean with absolute ethanol and deionized water, dry the product at 80 degrees, and grind the obtained silicon ball sample for backup use.

[0034] 2) TaCl 5 Dissolve in 50ml of ethanol-water (v / v=1:1) solution, adjust pH=4-6 with citric acid, the molar ratio of metal ion to citric acid is 1 / 2. After stirring at room temperature for 1-2 hours, add silicon balls, stir for 3-8 hours, centrifuge, wash thoroughly with deionized water and absolute ethanol, dry at 80°C for 14 hours, and calcinate at 400-600°C for 2 hours to obtain the desired sample .

[0035] 3) TaCl 5 Dissolve in 50ml of ethanol-water (v / v=1:1) solution, adjust pH=4-6 with citric acid, the molar ratio of metal ion to citric acid is 1 / 2. After stirring at room temperature for 1-2 hours, add the sample prepared in the second step, stir for 3-8 hours, centrifuge, wash thoroughly with deionized water ...

Embodiment 3

[0041] Investigate the prepared CdS / (Ta 2 o 5 -SiO 2 ) and CdS / (Cal-Ta 2 o 5 -SiO 2 ) Catalytic activity to degrade RhB under visible external light. Ta 2 o 5 CdS / (Ta 2 o 5 -SiO 2 ), CdS / (Cal-Ta 2 o 5 -SiO 2 ) and control CdS / Ta 2 o 5 -commercial 0.1g is put into 200ml rhodamine B (0.01g / L), stirred in the dark for 30 minutes to achieve adsorption-desorption equilibrium, then irradiated with visible light, take a sample every 10 minutes, and measure it with a liquid UV-visible spectrophotometer Absorbance, calculate C / C 0 and -Ln (C / C 0 ), the result is as Figure 5 .

[0042] CdS / (cal-Ta 2 o 5 -SiO 2 ) has the highest photocatalytic activity, and can degrade more than 95% in 30 minutes, far exceeding CdS / (Ta 2 o 5 -SiO 2 ) and CdS / Ta 2 o 5 -commercial degradation efficiency.

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Abstract

The invention relates to a preparing method for a visible light response CdS / (cal-Ta2O5-SiO2) composite photocatalyst. The method includes the steps of dissolving tantalum chloride in an ethanol water solution, adjusting pH to be equal to 4-6 with citric acid, adding silicon balls to stir for 3-8 h, conducting centrifugal separation, drying at 80 DEG C, roasting for 2 h at 400-600 DEG C to obtaina sample, and repeating the above steps by 3 times to obtain a Cal-Ta2O5-SiO2 sample; immersing the sample into 0.2 M Cd (AC) 2 solution for 2-3 min, immersing the sample into 50-80 ml of 0.2 M Na2Ssolution for 2-3 min, centrifuging, and washing; putting into a drying oven at 80 DEG C for drying for 12-16 h; repeating in this way, and finally obtaining the sample which is named as CdS / (cal-Ta2O5-SiO2). The preparing method is novel, precursors are low in cost and uniform in size, and moreover, the CdS / (cal-Ta2O5-SiO2) composite photocatalyst has high photocatalytic activity, a long catalytic life, and a potential industrial application value.

Description

technical field [0001] The invention relates to a CdS / (cal-Ta 2 o 5 -SiO 2 ) preparation method of composite photocatalyst. Background technique [0002] Tantalum pentoxide is a promising photocatalyst in dye degradation and photolysis of water. Compared with other photocatalytic materials, tantalum pentoxide has significant advantages such as high chemical stability, high photocatalytic efficiency, environmental friendliness, high piezoelectric constant and high refractive index. Compared with titanium dioxide, tantalum pentoxide has a more negative 5d orbital than Ti 3d orbital, and its redox ability is stronger. Its oxides and salts have received extensive attention and research. In recent years, tantalum pentoxide-based photocatalysts have also been gradually applied in photocatalytic reactions. However, since the band gap of tantalum pentoxide is 3.9-4.0eV, this band gap can only be excited by ultraviolet light. And pure ultraviolet light only accounts for 4-5% of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/08B01J37/08C01B3/04C02F1/30C02F1/32C02F101/38
CPCY02E60/36
Inventor 李菊霞李兰冬武光军戴卫理关乃佳
Owner NANKAI UNIV
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