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Magnetic recyclable hollow TiO2-SiO2-CoFe2O4 nano photocatalytic material and preparation method thereof

A tio2-sio2-cofe2o4, catalytic material technology, applied in the field of nano-photocatalytic materials, can solve the problems of reduced magnetic properties of photocatalysts, reduced activity of photocatalysts, not seen, etc., achieves low density, strengthens the effect of TiO2 bonding, Not easy to fall off effect

Inactive Publication Date: 2013-06-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the preparation of such materials, heat treatment will make TiO 2 The interaction between the cladding layer and the magnetic substance leads to a decrease in the activity of the photocatalyst; on the other hand, due to the porosity of the cladding layer, heat treatment can also cause local changes in the inner core of the magnetic particles and reduce the magnetic properties of the photocatalyst.
However, there is no hollow TiO that can be magnetically recycled. 2 -SiO 2 -CoFe 2 o 4 Report on Nano Photocatalytic Materials

Method used

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  • Magnetic recyclable hollow TiO2-SiO2-CoFe2O4 nano photocatalytic material and preparation method thereof
  • Magnetic recyclable hollow TiO2-SiO2-CoFe2O4 nano photocatalytic material and preparation method thereof
  • Magnetic recyclable hollow TiO2-SiO2-CoFe2O4 nano photocatalytic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 2

[0037] 1) The 0.05 g / mL glucose solution was hydrothermally synthesized at a hydrothermal temperature of 200 °C for 4 h to prepare carbon spheres;

[0038] 2) Prepare a 0.003 g / mL NaCl solution, add polymethyldiallyl ammonium chloride, namely PDDA, to prepare a 0.1 wt.% PDDA solution, add the product obtained in the above step 1) and stir for 60 min before filtering, Obtain carbon sphere-PDDA; prepare 0.003 g / mL NaCl solution, add polystyrene sulfonate sodium, namely PSS, to prepare 0.05 wt.% PSS solution, add carbon sphere-PDDA and stir for 30 min, then filter to obtain carbon Balls-(PDDA-PSS); adding carbon balls-(PDDA-PSS) to the above PDDA solution to prepare carbon balls-(PDDA-PSS-PDDA) particles, finally making the surface of carbon balls uniformly distributed positive charges;

[0039] 3) Add 0.045 g / mL FeCl 3 ·6H 2 O and 0.02 g / mL CoCl 2 ·6H 2 O dissolved in ethylene glycol, where FeCl 3 ·6H 2 O and CoCl 2 ·6H 2 The molar ratio of O is 2:1; then urea and polyvi...

Embodiment 3

[0045] 1) The 0.5 g / mL glucose solution was hydrothermally synthesized at a hydrothermal temperature of 150 °C for 12 h to prepare carbon spheres;

[0046] 2) Prepare a 0.005 g / mL NaCl solution, add polymethyldiallyl ammonium chloride, namely PDDA, to prepare a 0.2 wt.% PDDA solution, add the product obtained in the above step 1) and stir for 60 min before filtering, Obtain carbon spheres-PDDA; prepare 0.005 g / mL NaCl solution, add polystyrene sulfonate sodium, namely PSS, to prepare a 0.1 wt.% PSS solution, add carbon spheres-PDDA and stir for 30 min, then filter to obtain carbon Balls-(PDDA-PSS); adding carbon balls-(PDDA-PSS) to the above PDDA solution to prepare carbon balls-(PDDA-PSS-PDDA) particles, finally making the surface of carbon balls uniformly distributed positive charges;

[0047] 3) Add 0.405 g / mL FeCl 3 ·6H 2 O and 0.18 g / mL CoCl 2 ·6H 2 O dissolved in ethylene glycol, where FeCl 3 ·6H 2 O and CoCl 2 ·6H 2 The molar ratio of O is 2:1; then urea and pol...

Embodiment 4

[0053] 1) The 0.45 g / mL glucose solution was hydrothermally synthesized at a hydrothermal temperature of 180 °C for 6 h to prepare carbon spheres;

[0054] 2) Prepare a 0.004 g / mL NaCl solution, add polymethyldiallyl ammonium chloride, namely PDDA, to prepare a 0.2 wt.% PDDA solution, add the product obtained in the above step 1) and stir for 60 min before filtering, Obtain carbon spheres-PDDA; prepare 0.004 g / mL NaCl solution, add sodium polystyrene sulfonate, namely PSS, to prepare a 0.1 wt.% PSS solution, add carbon spheres-PDDA and stir for 30 min, then filter to obtain carbon Balls-(PDDA-PSS); adding carbon balls-(PDDA-PSS) to the above PDDA solution to prepare carbon balls-(PDDA-PSS-PDDA) particles, finally making the surface of carbon balls uniformly distributed positive charges;

[0055] 3) Add 0.09 g / mL FeCl 3 ·6H 2 O and 0.04 g / mL CoCl 2 ·6H 2 O dissolved in ethylene glycol, where FeCl 3 ·6H 2 O and CoCl 2 ·6H 2 The molar ratio of O is 2:1; Then urea and poly...

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Abstract

The invention discloses a magnetic recyclable hollow TiO2-SiO2-CoFe2O4 nano photocatalytic material and a preparation method thereof. The material is of a hollow structure, magnetic particles are wrapped by SiO2, and an outmost layer is a TiO2 coating. The method comprises the following steps of: hydro-thermally synthesizing nanocarbon spheres by utilizing glucose; precipitating SiO2 on the prepared magnetic particle surfaces through the reaction of a silicon source; based on the carbon spheres as a formwork material, loading magnetic SiO2 nano particles on carbon sphere surfaces under the action of adsorption, and thus preparing the SiO2-CoFe2O4-carbon sphere compound SCC; and loading TiO2 on the SCC surface by adopting a sol-gel method, and calcining to obtain the material. The material has the characteristics of good photocatalytic property under ultraviolet lights, controllable magnetic property, adjustable size, no physiological toxicity and the like; and moreover, due to the hollow structure, the compound microspheres also have the advantages of low density, high specific surface area and the like.

Description

[0001] technical field [0002] The invention relates to a nanometer photocatalytic material, in particular to a magnetically recyclable hollow TiO 2 -SiO 2 -CoFe 2 o 4 Nano photocatalytic material and its preparation method. Background technique [0003] Among oxide semiconductors, anatase nano-TiO 2 Photocatalytic activity is the strongest, and it has the advantages of good chemical stability, wear resistance, low cost, and direct use of sunlight. It has been gradually used in environmental fields such as wastewater treatment, water purification, and air purification. Nano-TiO for Photodegradation 2 There are usually two forms of suspension and fixed, suspension TiO 2 Although the powder has a large specific surface area and high photocatalytic efficiency, it is easy to aggregate and difficult to recycle, which limits its popularization and application. The magnetic substance and TiO 2 The magnetically loaded photocatalyst developed in combination has the high effi...

Claims

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Application Information

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IPC IPC(8): B01J23/75
Inventor 李琴王冰李闯崔皓张进翟建平
Owner NANJING UNIV
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