Magnetic core-shell Fenton-type catalyst, and preparation method and application of catalyst

A catalyst, core-shell technology, applied in the fields of nanomaterials and environmental science, can solve the problems of inability to maintain high activity, reduce catalyst activity, catalyst poisoning, etc., to reduce the possibility of pollution and poisoning, reduce surface energy, and prevent agglomeration Effect

Inactive Publication Date: 2013-10-02
SHANGHAI WINNER ENVIRONMENTAL TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoscale Fe 3 o 4 Although magnetic nanoparticles have excellent superparamagnetism, they are easy to agglomerate due to their high surface energy and cannot maintain their high activity during actual use.
Moreover, complex components in wastewater are also easily adsorbed on Fe as a catalyst. 3 o 4 The surface of magnetic nanoparticles, which reduces catalyst activity and causes "catalyst poisoning"

Method used

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  • Magnetic core-shell Fenton-type catalyst, and preparation method and application of catalyst
  • Magnetic core-shell Fenton-type catalyst, and preparation method and application of catalyst
  • Magnetic core-shell Fenton-type catalyst, and preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Fe 3 o 4 Preparation of microspheres: 1.3 g of FeCl 3 , 0.5g of sodium citrate, 2.0g of sodium acetate were added to 40mL of ethylene glycol in turn, after stirring evenly, transferred to a 100mL hydrothermal kettle, after hydrothermal reaction at 200°C for 10h, cooled to room temperature, centrifuged, After the product was washed 3 times with absolute ethanol and ultrapure water, it was dried for later use; the product Fe 3 o 4 The SEM pictures of the microspheres are as figure 1 As shown, the high-resolution TEM photographs are as figure 2 shown;

[0029] (2) Nano SiO 2 Preparation of particles: Prepare a solution of ethyl orthosilicate, absolute ethanol and water at a volume ratio of 1:2:2, raise the temperature to 70°C, stir for 1.5h, then add 2.0mol / L ammonia solution, and continue the reaction for 1h Prepared 30nm nano-SiO 2 particles;

[0030] (3) Fe 3 o 4 / (PE / SiO 2 ) n Preparation of microspheres:

[0031] I. Cationic polyelectrolyte (PDDA) ...

Embodiment 2

[0036] The heterogeneous Fenton method is adopted to process phenol-containing wastewater, using the Erlenmeyer flask as the reactor, the initial concentration of wastewater is 15mg / L, and the Fe prepared in 100mg / L embodiment 1 is added simultaneously. 3 o 4 / (PDDA / 30-SiO 2 ) 3 Composite microspheres and 10mmoL / L of H 2 o 2 , place the reactor in a water bath shaker with a rotation speed of 150 rpm and a temperature of 30 °C.

[0037] According to the direct method in the national standard (GB7491.87), the concentration of phenol was determined. The results showed that Fe 3 o 4 / (PDDA / 30-SiO 2 ) 3 The heterogeneous Fenton method with composite microspheres as a catalyst has a good effect on the treatment of phenol wastewater. After 1 hour of reaction, the removal rate of phenol reaches more than 90%.

Embodiment 3

[0039] Save the IV step of step (3) in embodiment 1, other steps are all the same as embodiment 1, obtain Fe 3 o 4 / (PDDA / 30-SiO 2 ) 1 Composite microspheres, the thickness of the shell is about 60nm, and the thickness of the shell is smaller than that of Fe 3 o 4 / (PDDA / 30-SiO 2 ) 3 The shell thickness of the composite microsphere is small.

[0040] "Wastewater initial concentration is 15mg / L" is adjusted to "wastewater initial concentration is 100mg / L" in embodiment 2, and " the Fe that adds 100mg / L simultaneously 3 o 4 / (PDDA / 30-SiO 2 ) 3 Composite microspheres and 10mmoL / L of H 2 o 2 "Adjusted to" add 200mg / L of Fe at the same time 3 o 4 / (PDDA / 30nm-SiO 2 ) Composite microspheres and 50mmoL / L of H 2 o 2 ", other steps are the same as in Example 2.

[0041] After 1 hour of reaction, the removal rate of phenol has reached over 96%.

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Abstract

The invention discloses a magnetic core-shell Fenton-type catalyst, and a preparation method and an application of the catalyst. An inner core of the core-shell Fenton-type catalyst is an Fe3O4 microsphere accumulated by nano Fe3O4 particles; a shell layer is an alternate adsorption sequence layer formed by a cationic polyelectrolyte and nano SiO2 particles; and an outermost layer of the alternate adsorption sequence layer is an SiO2 nano particle layer such as -ABABAB, wherein A is the cationic polyelectrolyte, and B is SiO2. The preparation method of the catalyst comprises the steps of preparing the Fe3O4 microsphere by a hydrothermal method, preparing the nano SiO2 particles by a sol-gel method, and assembling the cationic polyelectrolyte with positive charges and the nano SiO2 particles with negative charges on the Fe3O4 microsphere by a layer-by-layer electrostatic self-assembly method. The core-shell Fenton-type catalyst is high in catalysis efficiency and easy to recover, can be used repeatedly, can be coupled with H2O2 to form an inhomogeneous phase Fenton-type system, and can conduct catalytic oxidation on phenolic wastewater.

Description

technical field [0001] The invention belongs to the field of nanomaterials and environmental science, in particular, it relates to a preparation method and application of a core-shell magnetic Fenton catalyst, the core of which is Fe 3 o 4 Microspheres, the shell is made of SiO 2 composition of nanoparticles. Background technique [0002] Phenol and similar compounds containing benzene rings are common organic pollutants in industrial wastewater, which are highly toxic and difficult to be degraded by microorganisms in the environment. Currently common treatment methods include physical adsorption, chemical oxidation and biodegradation. In recent years, the Fenton oxidation technology in the chemical oxidation method has gradually become a focus of attention. It utilizes Fe 2+ and H 2 o 2 The combination of the two reacts to generate highly oxidizing hydroxyl radicals (·OH) to oxidize and decompose organic pollutants in water. This method has the advantages of fast and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J35/08C02F1/72
Inventor 张建鹏杨晓玲钟丽云王伟萍胡敏
Owner SHANGHAI WINNER ENVIRONMENTAL TECH
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