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Polypyrrole-TiO2 magnetically supported photocatalytic composite material and preparation method thereof

A composite material, polypyrrole technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of low photocatalytic degradation efficiency, weak acid resistance, iron Oxygen magnetic properties are reduced and other problems, to achieve the effect of expanding the spectral response range, improving the utilization rate, and suppressing the recombination

Inactive Publication Date: 2013-12-25
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of polypyrrole-TiO 2 Magnetic-loaded photocatalytic composite materials to solve the problem of lower magnetic properties of ferrite as a magnetic matrix, weak acid resistance and TiO as a photocatalytic part 2 The problem of low photocatalytic degradation efficiency

Method used

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  • Polypyrrole-TiO2 magnetically supported photocatalytic composite material and preparation method thereof
  • Polypyrrole-TiO2 magnetically supported photocatalytic composite material and preparation method thereof
  • Polypyrrole-TiO2 magnetically supported photocatalytic composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Preparation of magnetic matrix Fe using co-precipitation method 3 o 4 : Weigh FeSO 4 ·7H 2 O 3.00g, Fe 2 (SO 4 ) 3 Dissolve 4.00 g in 250 mL of distilled water, stir magnetically in a water bath at 55°C until the solids are completely dissolved; add 42mL of NaOH solution with a concentration of 2mol / L to the solution, then continue to heat up to 60°C for 6 hours, and transfer to the solution after magnetic precipitation Remove the supernatant, wash with distilled water for 5 times, and wash with ethanol for 2 times; after the sample is dried at room temperature, it is ground to obtain Fe 3 o 4 Magnetic substrate.

[0024] Use silane coupling agent γ-chloropropyltrimethoxysilane (NQ-54) to Fe 3 o 4 -R and make modifications. Measure 2.0mL of silane coupling agent and add it to ethanol aqueous solution (100mL distilled water + 30mL absolute ethanol), the volume ratio of silane coupling agent is 1.51%; add glacial acetic acid dropwise to the sample to adjust the...

Embodiment 2

[0033] Preparation of magnetic matrix Mn by sol-gel method 0.4 Zn 0.6 Fe 2 o 4 : Weigh Zn(NO 3 ) 2 ·6H 2 O0.89g, Fe(NO 3 ) 3 9H 2 O4.04g was dissolved in 60mL of distilled water, heated and stirred to make it completely dissolved; dropwise adding mass fraction was 50% Mn(NO 3 ) 2 Solution 0.46mL, then add complexing agent tartaric acid 2.25g, continue to heat and stir at a constant temperature of 60°C until completely dissolved, add ammonia water with a mass fraction of 25% to adjust the pH to 7, and stir at a constant temperature for 2 hours at 80°C to form a sol; Place it left and right to form a gel, dry it at 110°C, put it into a muffle furnace for calcination at 550°C for 2 hours, and grind it to get Mn 0.4 Zn 0.6 Fe 2 o 4 Magnetic substrate.

[0034] Use silane coupling agent γ-chloropropyltrimethoxysilane (NQ-54) to Mn 0.4 Zn 0.6 Fe 2 o 4 Make modifications. Measure 2.0mL of silane coupling agent and add it to ethanol aqueous solution (100mL distille...

Embodiment 3

[0043] Analysis and study of prepared PPy-TiO 2 / M-Fe 3 o 4 The ability of the sample to photocatalytically degrade methyl orange under ultraviolet light and sunlight and the ability of multiple separation and recovery. Specific steps are as follows:

[0044] Research on Photocatalytic Degradation of Methyl Orange

[0045] The prepared PPy-TiO 2 / M-Fe 3 o 4 0.1 g of samples were respectively dispersed in 50 mL of methyl orange solution with a mass concentration of 6 mg / L, and ultrasonically dispersed for 20 min. The samples were placed under the ultraviolet lamp and sunlight for photocatalytic test respectively, and the distance between the light source and the sample under the ultraviolet lamp (18W) was 10cm. Samples were taken every 30 minutes, centrifuged at a speed of 3000r / min for 10 minutes, and the supernatant was taken to measure its absorbance. The wavelength was set to the maximum absorbance of methyl orange at 463nm. Calculate the degradation rate to analyze...

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Abstract

The invention discloses a polypyrrole-TiO2 magnetically supported photocatalytic composite material and a preparation method thereof, belongs to the field of magnetically supported photocatalytic material technology, and relates to a ferrite magnetically supported photocatalytic composite material. The polypyrrole-TiO2 magnetically supported photocatalytic composite material comprises a magnetic substrate and a photocatalyst; the magnetic substrate is obtained by subjecting ferrite to surface organic modification with a silane coupling agent, and the photocatalyst is prepared by subjecting TiO2 to surface photosensitization with polypyrrole; and the polypyrrole-TiO2 magnetically supported photocatalytic composite material is of a multi-layer core-shell structure comprising ferrite, the silane coupling agent, TiO2 and polypyrrole from inside to outside. The polypyrrole-TiO2 magnetically supported photocatalytic composite material is capable of increasing magnetic property and acid stability of ferrite; inhibiting recombination of TiO2 carriers; enlarging spectral response range of TiO2; and improving utilization ratio of sunlight.

Description

technical field [0001] The invention belongs to the technical field of magnetic carrier photocatalytic materials, and relates to a ferrite magnetic carrier photocatalytic composite material, in particular to a polypyrrole-TiO 2 Magnetic-supported photocatalytic composite material and its preparation method. Background technique [0002] At present, magnetically loaded photocatalytic materials are mainly composed of magnetic substrates and photocatalytic materials. Most of the magnetic substrate is ferrite, and the most common photocatalytic material is TiO 2 , the two are directly combined to form a composite material with a core-shell structure. This composite material has both photocatalytic properties and the performance of being separable and recyclable by an external magnetic field. However, the composite photocatalytic material prepared with ferrite as raw material has the defects of reduced magnetic properties and weak acid resistance, which affects the recovery and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J35/00
Inventor 杨晓峰张蕾陈志萍李巧玲景红霞李敏
Owner ZHONGBEI UNIV
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