mhcf/tio 2 Nanocomposite Catalyst and Its Preparation and Application

A nanocomposite and catalyst technology, applied in the direction of physical/chemical process catalysts, nanotechnology, nanotechnology, etc., to achieve the effects of improved efficiency, good stability and recycling performance

Inactive Publication Date: 2017-09-26
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/tio <sub>2</sub> Nanocomposite Catalyst and Its Preparation and Application
  • mhcf/tio <sub>2</sub> Nanocomposite Catalyst and Its Preparation and Application
  • mhcf/tio <sub>2</sub> Nanocomposite Catalyst and Its Preparation and Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Disperse 0.95g titanium dioxide (P25) in 15ml deionized water and stir evenly, add 0.0254g 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 from the liquid surface), after 30min, the activity of degradation RhB dark reaction is 22%, and the activity under ultraviolet ...

Embodiment 2

[0030] Disperse 0.95g titanium dioxide (P25) in 15ml deionized water and stir evenly, add 0.048g 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 10cm height 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 titanium dioxide (P25) in 15ml deionized water and stir evenly, add 0.0845g 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 10cm height 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 of a transition metal hexacyanoferrate / titanium dioxide nanocomposite catalyst: using 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) on the surface of titania nanoparticles yielded MHCF / TiO 2 nanocomposite catalysts. The present invention also provides a kind of MHCF / TiO 2 Nanocomposite catalyst light-Fenton synergistic reaction method for degrading organic pollutants: in the dark reaction without light, MHCF can degrade organic pollutants in the form of Fenton reaction, and under ultraviolet light irradiation, titanium dioxide (photocatalyst) can Electron-hole pairs are generated, and electrons can be accelerated by H in MHCF 2 o 2 The reduction of oxidized ferric iron, at the same time, MHCF can also inhibit the recombination of photogenerated electrons and holes by accepting the electrons of titanium dioxide, thereby accelerating the Fenton reaction and the efficiency of hydroxyl radicals generated by the photocatalytic process. have very good degradation efficiencies.

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 Patents(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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