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Multi-phase light-assisted Fenton catalyst and preparation method thereof

A catalyst, fec2o4 technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of low catalytic activity, difficult to degrade non-dye organic pollutants, etc., and achieve high catalytic activity Effect

Inactive Publication Date: 2012-06-27
SHENZHEN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a heterogeneous photo-assisted Fenton catalyst and preparation method thereof, aiming at solving the defects that the existing heterogeneous photo-assisted Fenton catalyst has low catalytic activity and is difficult to degrade non-dye organic pollutants under the action of visible light

Method used

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  • Multi-phase light-assisted Fenton catalyst and preparation method thereof
  • Multi-phase light-assisted Fenton catalyst and preparation method thereof
  • Multi-phase light-assisted Fenton catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] r-TiO 2 Preparation of HAP-coated r-TiO by immersion in artificial simulated body fluids to induce HAP deposition 2 (HAP-TiO 2 ), wherein the coating amount of HAP is 2.9%; then the HAP-TiO 2 Placed in 0.0055 mol / L FeC 2 o 4 In the solution, stir well, and evaporate all the water in a water bath at 100 °C to obtain a mixed powder, in which Fe and TiO 2 The mass ratio of the mixture is 2:100; finally, the mixed powder is heated in a tube furnace at a temperature of 400 °C, and the furnace is filled with an argon atmosphere to obtain Fe-HAP-TiO 2 .

[0043] figure 1 Indicates that different catalysts can catalyze H 2 o 2 Degradation of atrazine. show that r-TiO 2 When used as a catalyst, the degradation rate of atrazine was only 40% after 120 min of reaction, but for r-TiO 2 For loading Fe treatment, that is, Fe-TiO 2 When used as a catalyst, the degradation rate is nearly 60% after 60 minutes of reaction; while the Fe-HAP-TiO prepared at a calcination tempera...

Embodiment 2

[0046] As described in Example 1, the mixed powder is heated in a tube furnace at a temperature of 300-900° C., wherein an argon atmosphere is passed through the furnace to obtain Fe-HAP-TiO2 samples at different calcination temperatures, wherein Fe-loaded The amount is 2%.

[0047] The TiO 2 The crystal forms of all exist in the rutile form, which is different from the precursor TiO 2 The crystal form distribution is consistent; image 3 As shown, the characteristic diffraction peak of HAP appears at about 31 (°) of the sample 2θ, and the characteristic diffraction peak of α-Fe appears at about 33 (°). 2 o 3 The characteristic diffraction peaks indicate that the sample generated HAP and α-Fe 2 o 3 A new phase; when the calcination temperature reaches 600 ℃ and 700 ℃, the sample appears α-Fe at 2θ=33.1 (°) 2 o 3 The characteristic diffraction peak of is slightly weakened, and Fe appears at 2θ=48.7(°) 2 TiO 5 The new characteristic diffraction peak of , that is, Fe has...

Embodiment 3

[0051] As described in Example 1, first prepare HAP-TiO with 2.9% HAP coating 2 , then HAP-TiO 2 Place 0.0055 mol / L FeC in different proportions with Fe 2 o 4 In the solution, stir well, and evaporate all the water in a water bath at 100 °C to obtain a mixed powder, in which Fe and TiO 2 The mass ratios are 0, 1, 2, 4, 5:100 respectively; finally, the mixed powder is heated in a tube furnace at a temperature of 400 °C, and an argon atmosphere is passed through the furnace to obtain Fe with different Fe loads. -HAP-TiO 2 sample.

[0052] Figure 6 showed that, for HAP-TiO 2 For loaded Fe treatment, its catalytic activity is low; 2% Fe-loaded Fe-HAP-TiO 2 The sample has better catalytic activity, while Fe-HAP-TiO with higher Fe loading 2 Samples, such as 3-5%, the catalytic activity began to decline.

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Abstract

The invention discloses a multi-phase light-assisted Fenton catalyst and a preparation method thereof. In the multi-phase light-assisted Fenton catalyst, TiO2 is used as a vector of Fe (III), wherein hydroxylapatite is coated at the surface of the TiO2; and the hydroxylapatite is used as an isolating transition layer between the TiO2 and the Fe (III). According to the multi-phase light-assisted Fenton catalyst obtained by adopting the scheme, H2O2 can be catalyzed under visible light to degrade an organic pollutant, and a reaction path with a plurality of channels is formed, so that high catalytic activity is obtained.

Description

technical field [0001] The invention relates to the field of chemical catalysts, in particular to a heterogeneous light-assisted Fenton catalyst and a preparation method thereof. Background technique [0002] As an advanced oxidation technology based on the hydroxyl radical process, the light-assisted Fenton reaction has outstanding advantages in removing refractory organic pollutants in the aqueous environment; however, there are still some shortcomings that need to be solved urgently: At present, the heterogeneous photo-assisted Fenton reaction is widely studied. In order to obtain high reaction efficiency, the pH value of the solution system is required to be below 3, which makes it often time-consuming and laborious to manually adjust the pH value in the actual treatment process, and after the reaction is completed The iron-containing muddy matter must be further processed, resulting in high processing costs; secondly, because the light absorption range of iron-based com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185C02F1/30C02F1/72C02F101/38
Inventor 唐建军邹原
Owner SHENZHEN POLYTECHNIC
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