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MHCF/TiO2 nanocomposite catalyst as well as preparation method and application thereof

A nanocomposite, catalyst technology, applied in physical/chemical process catalysts, nanotechnology, nanotechnology and other directions, to achieve the effect of improving efficiency, good stability and recycling performance

Inactive Publication Date: 2015-11-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Recent researchers on MHCF, TiO 2 to H 2 o 2 A lot of research has been done on the detection of MHCF / TiO 2 Studies on photocatalysis or Fenton reaction have not been reported

Method used

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  • MHCF/TiO2 nanocomposite catalyst as well as preparation method and application thereof
  • MHCF/TiO2 nanocomposite catalyst as well as preparation method and application thereof
  • MHCF/TiO2 nanocomposite catalyst as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Disperse 0.95g of titanium dioxide (P25) in 15ml of deionized water and stir evenly, add 0.0254g of K 4 [Fe(CN) 6 ] Continue stirring for 30min to obtain solution a, dissolve 0.024g ferric chloride in 15ml deionized water to obtain solution b, slowly add solution b dropwise to a, continue stirring for 30min, and age for 20h. Prepare MHCF / TiO 2 =1 / 200 (molar ratio) nanocomposite material (observed by electron microscope, its particle size is 20-50 nanometers). Centrifugal washing and drying (drying at 20-80 degrees Celsius can be used) for light-Fenton synergistic catalytic activity test (dark reaction conditions: catalyst concentration 1g / L, RhB concentration 12mg / L, H 2 o 2 An aqueous solution with a concentration of 0.4mol / L. Photo-Fenton reaction conditions: add ultraviolet light on the basis of dark reaction: 27w black light lamp is 10cm height away from the liquid surface), after 30min, its activity of degrading RhB dark reaction is 22%, and the activity under ...

Embodiment 2

[0030] Disperse 0.95g of titanium dioxide (P25) in 15ml of deionized water and stir evenly, add 0.048g of K 4 [Fe(CN) 6 ]Continue stirring for 30min to obtain solution a, dissolve 0.0507g ferric chloride in 15ml deionized water to obtain solution b, slowly add solution b dropwise to a, continue stirring for 30min, and age for 20h. Prepare MHCF / TiO 2 =1 / 100 (molar ratio) of the nanocomposite material. After centrifugal washing and drying, it was used for light-Fenton synergistic catalytic activity test (dark reaction conditions: catalyst concentration 1g / L, RhB concentration 12mg / L, H 2 o 2 An aqueous solution with a concentration of 0.4mol / L. Photo-Fenton reaction conditions: add ultraviolet light on the basis of dark reaction: 27w black light lamp is 10cm away from the liquid surface). After 30min, its activity of degrading RhB dark reaction was 54%, and the activity under ultraviolet light irradiation was 83%.

Embodiment 3

[0032] Disperse 0.95g of titanium dioxide (P25) in 15ml of deionized water and stir evenly, add 0.0845g of K 4 [Fe(CN) 6 ]Continue stirring for 30min to obtain solution a, dissolve 0.0721g ferric chloride in 15ml deionized water to obtain solution b, slowly add solution b dropwise to a, continue stirring for 30min, and age for 20h. Prepare MHCF / TiO 2 =1 / 60 (molar ratio) of the nanocomposite material. After centrifugal washing and drying, it was used for light-Fenton synergistic catalytic activity test (dark reaction conditions: catalyst concentration 1g / L, RhB concentration 12mg / L, H 2 o 2 An aqueous solution with a concentration of 0.4mol / L. Photo-Fenton reaction conditions: add ultraviolet light on the basis of dark reaction: 27w black light lamp is 10cm away from the liquid surface). After 30 minutes, its activity of degrading RhB dark reaction was 81%, and the activity under ultraviolet light irradiation was 95%.

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Abstract

The invention provides a preparation method of a transition metal hexacyanoferrate / titanium dioxide nanocomposite catalyst. According to the preparation method, by taking transition metal chloride or transition metal nitrate, potassium ferrocyanide and titanium dioxide as raw materials, through an in-situ chemical solution method, in-situ growth of transition metal hexacyanoferrate (MHCF) is carried out on the surfaces of titanium dioxide nanoparticles to obtain the MHCF / TiO2 nanocomposite catalyst. The invention also provides a method for degradation of organic pollutants by light-fenton concerted reaction of the MHCF / TiO2 nanocomposite catalyst. According to the method, in dark reaction in the absence of light, the organic pollutants can be degraded by the MHCF in the form of fenton reaction, while under ultraviolet irradiation, the titanium dioxide (photocatalyst) can generate electron-hole pairs, electrons can accelerate reduction of ferric iron oxidized by H2O2 in the MHCF, meanwhile, the MHCF receiving the electrons of the titanium dioxide can also inhibit compounding of photoelectron holes, and then accelerate the generating efficiency of hydroxyl radicals during fenton reaction and a photocatalytic process, and the synergistic effect of the MHCF and the electrons has very high degradation efficiency for various different organic pollutants.

Description

technical field [0001] The invention relates to the preparation of a transition metal hexacyanoferrate / titanium dioxide nanocomposite catalyst and a method for synergistically catalytically degrading various organic pollutants through photocatalysis and heterogeneous Fenton reaction under the irradiation of ultraviolet light. Background technique [0002] Transition metal hexacyanoferrate is a metal-organic framework compound with rich composition and structure changes, and along with the development of material science, new members are constantly being synthesized. Such compounds have been widely studied because of their excellent physical and chemical properties such as adsorption, catalysis, and photomagnetic properties. Due to its high-efficiency peroxidase activity, it is widely used in hydrogen peroxide sensors and other fields. The Fenton reaction is a method of using ferric ions to catalyze hydrogen peroxide to generate active species such as hydroxyl groups to degr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/26B82Y30/00C02F1/32C02F1/72C02F1/58
Inventor 李旭宁王军虎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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