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Multiphase magnetic Fenton-photocatalyst and preparation method thereof and application

A photocatalyst and magnetic technology, applied in the fields of nanomaterials science and environmental science, can solve the problems of destroying the stability of TiO2, unfavorable to the catalytic reaction of wastewater, loss of photocatalytic activity, etc., and achieves good superparamagnetic properties, excellent magnetic response performance, maintain high activity

Inactive Publication Date: 2015-11-11
张少旸
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the SiO in the shell 2 and TiO 2 The boundary is not clear, some TiO 2 possibly by SiO 2 encapsulation, thereby losing photocatalytic activity
[0007] Therefore, some researchers pointed out that the construction of multiphase Fenton-TiO 2 In the light-assisted system, the following problems cannot be ignored: (1) If the free Fe(Ⅲ) is directly loaded on TiO 2 surface, Fe(Ⅲ) may enter TiO in the form of ion substitution doping 2 lattice, destroying the TiO 2 stability
And there may also be an interaction between the two to reduce the activity
(2) The isolation transition layer made of carbon materials such as graphene will make TiO 2 The surface of the surface changes from hydrophilic to hydrophobic, which is not conducive to the catalytic reaction of wastewater

Method used

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  • Multiphase magnetic Fenton-photocatalyst and preparation method thereof and application
  • Multiphase magnetic Fenton-photocatalyst and preparation method thereof and application
  • Multiphase magnetic Fenton-photocatalyst and preparation method thereof and application

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Experimental program
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Effect test

Embodiment 1

[0035] (1) Fe 3 o 4 Preparation of microspheres: 1.3g FeCl 3 , 0.5g of trisodium citrate and 2.0g of sodium acetate were added to 40mL of ethylene glycol in turn, after stirring evenly, the mixed solution was transferred to a 100mL hydrothermal kettle, and after hydrothermal reaction at 200°C for 10h, it was cooled to room temperature , centrifuged to obtain Fe 3 o 4 The microspheres were washed three times with absolute ethanol and ultrapure water, and dried for later use;

[0036] (2) Fe 3 o 4 SiO 2 Preparation of microspheres: get 0.4g of Fe prepared above 3 o 4 The microspheres were ultrasonically dispersed in 150mL of absolute ethanol. After adding 1mL of ammonia water and 5mL of tetraethyl orthosilicate (TEOS) to the mixed solution, they were reacted at room temperature for 2h, cooled to room temperature, and centrifuged. Fe 3 o 4 SiO 2 The microspheres were washed three times with ethanol and ultrapure water, and dried for later use. The SEM photograph of t...

Embodiment 2

[0044] "5mL of tetraethyl silicate (TEOS)" in step (2) of Example 1 was adjusted to "3mL of tetraethyl silicate (TEOS)" in step (2) of Example 1, and all other conditions were same. reduces the amount of silicon source, making the Fe 3 o 4 SiO 2 TiO 2 SiO as an isolation transition layer in composite microspheres 2 The layer thickness decreases to about 60 nm. After treating MB simulated dye wastewater for 2 hours, the removal rate of MB is about 90%. The results are as follows image 3 shown. Visible, the SiO isolation transition layer 2 The thickness of the layer should not be too low. Otherwise Fe 3 o 4 with TiO 2 Mutual interference between layers will reduce Fe 3 o 4 SiO 2 TiO 2 Catalytic activity of composite microspheres.

Embodiment 3

[0046] Adjust the "after adding 100 uL tetrabutyl titanate (TBOT)" in step (3) of Example 1 to "after adding 50 uL tetrabutyl titanate (TBOT)" in step (3) in Example 1 , other conditions are the same. The amount of titanium source is reduced, so that Fe 3 o 4 SiO 2 TiO 2 TiO in composite microspheres 2 The layer thickness decreases to about 60 nm. After treating MB simulated dye wastewater for 2 hours, the removal rate of MB is about 68%. Visible, due to TiO 2 It has high photocatalytic activity, and its Fe 3 o 4 SiO 2 TiO 2 The content in the composite microspheres should not be too low (TiO2 layer thickness greater than 120 nm).

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Abstract

The invention relates to a multiphase magnetic Fenton-photocatalyst which is core-shell type microsphere Fe3O4@TiO2 which is of a three-layer structure. A core Fe3O4 microsphere is formed by stacking nanometer small granules of 15-30 nm, the thickness of a transitional SiO2 layer is 50-150 nm, and the thickness of an outermost TiO2 is 100-300 nm. The prepared photocatalyst has good superparamagnetism, can be separated thoroughly in 30 s under the effect of an outside magnetic field, is easy to recycle, can be recycled, and is environmentally friendly. The multiphase magnetic Fenton-photocatalyst can catalyze hydrogen peroxide under visible light to degrade organic pollutants, a multi-channel reaction pathway is formed, and accordingly high catalytic activity is achieved. A composite microsphere is good in monodispersity and can maintain high activity of a catalyst in wastewater treatment and improve utilization rate.

Description

technical field [0001] The invention relates to the fields of nanometer material science and environmental science, in particular to a Fe 3 o 4 SiO 2 TiO 2 Heterogeneous magnetic Fenton-like photocatalysts and methods for their preparation. Background technique [0002] With the rapid development of the dye textile industry, the discharge of dye textile wastewater has increased dramatically. Dye wastewater poses a serious threat to the human environment due to its extremely high chroma, poor biodegradability, and containing "three pathogenic" substances. Therefore, the treatment of dye wastewater has far-reaching significance. [0003] Advanced oxidation technology is based on the generation of oxidative free radicals, which attack and react with macromolecular organic matter, thereby destroying the organic molecular structure until it is decomposed into carbon dioxide and water, achieving the purpose of efficiently degrading organic and toxic pollutants. by Fe 2+ and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/02B82Y30/00B82Y40/00C02F1/30C02F101/38B01J35/00
Inventor 张少旸
Owner 张少旸
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