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Preparation method and regeneration method of porous visible light photocatalytic ZnFe2O4-TiO2/PVDF composite membrane

A technology of znfe2o4-tio2 and znfe2o4, which is applied in the field of preparation of ZnFe2O4-TiO2/PVDF visible photocatalytic composite film, can solve the problem of reduced catalyst activity, achieve the effect of increasing the contact area and improving the photocatalytic efficiency

Active Publication Date: 2021-06-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] After the catalyst has been used several times, the catalyst activity is greatly reduced

Method used

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  • Preparation method and regeneration method of porous visible light photocatalytic ZnFe2O4-TiO2/PVDF composite membrane
  • Preparation method and regeneration method of porous visible light photocatalytic ZnFe2O4-TiO2/PVDF composite membrane
  • Preparation method and regeneration method of porous visible light photocatalytic ZnFe2O4-TiO2/PVDF composite membrane

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Embodiment 1

[0030] Example 1, High Visible Light Catalytic Performance Porous ZnFe 2 o 4 -TiO 2 Synthesis of / PVDF composite film: ZnFe with strong visible light photoelectric conversion performance prepared by co-precipitation method 2 o 4Powder. Stir and mix 21.4ml tetrabutyl titanate and 85.6ml absolute ethanol to evenly adjust the pH2 o 4 The powder is added into liquid B at a molar ratio of 0.1%-3% to tetrabutyl titanate, and mixed evenly by ultrasonic. Slowly add liquid A into liquid B dropwise, stirring while adding, control the dropping speed to 3 drops every 2 seconds. Continue to stir for 2 hours after the liquid A is added dropwise to obtain a light yellow or brown sol. The gel was obtained by aging in a constant temperature box at 30° C. for 24 hours. Dry in a constant temperature oven at 60°C, grind through a 200-mesh sieve, and then calcinate in a tube furnace at 300-700°C under an argon atmosphere to obtain ZnFe with high photocatalytic performance 2 o 4 -TiO 2 co...

Embodiment 2

[0031] Example 2, visible light high catalytic efficiency porous ZnFe 2 o 4 -TiO 2 / PVDF composite membrane regeneration. After the composite membrane prepared in Example 1 was recycled several times to treat azo dye wastewater, its photocatalytic activity decreased. By immersing the low-activity composite membrane in Cr-containing 6+ 18-24H in the wastewater can not only regenerate the activity of the membrane, but also realize the high toxicity of Cr 6+ low toxicity Cr 3+ transformation.

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Abstract

The invention relates to a visible light catalytic membrane material, in particular to a preparation and regeneration method of a porous visible light photocatalytic ZnFe2O4-TiO2 / PVDF -composite membrane. The preparation method comprises the following steps: by taking PVDF as an adhesive, NMP as an organic solvent, PEG-400 as a membrane pore-forming agent and ZnFe2O4-TiO2 is prepared by a sol-gel method and is taken as a photocatalyst, wherein carrying out ultrasonic treatment on each reagent, stirring and dispersing to prepare a uniform dispersion liquid, molding on a treated glass slide by virtue of a bar coater, and drying and shaping in a constant-temperature oven, so as to obtain the membrane material after removing PEG-400 of the shaped membrane material in a removing agent. The photocatalytic performance of the membrane material which is recycled for multiple times is sharply reduced, the activity of the membrane material is recovered after the membrane material is soaked in waste water containing Cr < 6 + >, and regeneration of the activity is achieved. In the process, the membrane material is prepared by controlling factors such as the proportion of each reagent material in the composite membrane, the soaking time, the proportion of a PEG-400 removing agent and the like.

Description

technical field [0001] The invention relates to the field of composite membrane materials, in particular to ZnFe 2 o 4 -TiO 2 / PVDF visible light catalytic composite film preparation method and regeneration method. Background technique [0002] Dyes are widely used in printing and dyeing, food, medicine, cosmetics and other industries, and a large amount of dye wastewater will be generated during the production and use of dyes. Dye wastewater is one of the most difficult wastewater to treat in industrial wastewater. At present, there are chemical, physical and biological methods to deal with dye pollution at home and abroad. Photocatalyst TiO 2 Due to its non-toxic, stable chemical properties and many other advantages, it has always been a hot spot in the field of photocatalysis research. [0003] Since the discovery of TiO by Fujishima et al. in 1972 2 Since it has photocatalytic effect, photoexcited TiO 2 The decomposition and mineralization of dye pollutants have ...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01J31/06B01J35/10C02F1/30C02F101/38C02F101/22
CPCB01J31/38B01J31/06C02F1/30C02F2305/10C02F2101/40C02F2101/22B01J35/61B01J35/39
Inventor 胡晓荣封德军
Owner CHENGDU UNIVERSITY OF TECHNOLOGY