Preparation method of photo-Fenton self-cleaning film and application thereof

A technology of self-cleaning film and polyvinylidene fluoride film is applied in the field of preparation of optical Fenton self-cleaning film, which can solve problems such as hindering the application of film, and achieve the effects of strong self-cleaning, efficient separation and enhanced stability.

Active Publication Date: 2019-06-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although photocatalytically coupled membrane separation improves the self-cleaning performance of the membrane, the time-consuming photocatalytic or self-cleaning process (usually more than 60 min) and the incomplete degradation of oil in the membrane pores still hinder the application of the membrane in oily wastewater remediation.

Method used

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  • Preparation method of photo-Fenton self-cleaning film and application thereof
  • Preparation method of photo-Fenton self-cleaning film and application thereof
  • Preparation method of photo-Fenton self-cleaning film and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Surface modification of commercially available polyvinylidene fluoride membranes: first pre-wet a piece of commercially available polyvinylidene fluoride membranes with ethanol, and then soak the polyvinylidene fluoride membranes in an aqueous solution of 2 mg / mL tannic acid for 5 min. Then rinse the polyvinylidene fluoride membrane with tannic acid with deionized water, denoted as PVDF / TA membrane, and then transfer to FeCl with a concentration of 2mg / mL 3 ·6H 2 O aqueous solution for 5min, after rinsing with deionized water, dry at room temperature to obtain PVDF / TA-Fe(III) membrane;

[0030] (2) Preparation of self-cleaning membrane: a piece of PVDF / TA-Fe(III) membrane immersed in a concentration of 0.4wt% FeCl 3 ·6H 2 O aqueous solution was incubated at 60°C for 24 hours in a water bath, the membrane was taken out, rinsed with deionized water, and dried at 40°C to obtain a self-cleaning membrane, denoted as PVDF / TA / β-FeOOH.

Embodiment 2

[0032] (1) Surface modification of commercially available polyvinylidene fluoride membranes: first pre-wet the polyvinylidene fluoride membranes with ethanol, then soak the polyvinylidene fluoride membranes in 3.5 mg / mL tannic acid aqueous solution for 8 min, and then use Rinse the polyvinylidene fluoride membrane with tannic acid in deionized water, denoted as PVDF / TA membrane, and then transfer to FeCl with a concentration of 3.5mg / mL 3 ·6H 2 O aqueous solution for 8min, after rinsing with deionized water, dry at room temperature to obtain PVDF / TA-Fe(III) membrane;

[0033] (2) Preparation of self-cleaning membrane: the PVDF / TA-Fe(III) membrane is immersed in 0.2wt% FeCl 3 ·6H 2 O aqueous solution was incubated at 75°C for 18 hours in a water bath, the membrane was taken out, rinsed with deionized water, and dried at 40°C to obtain a self-cleaning membrane, which was designated as PVDF / TA / β-FeOOH.

Embodiment 3

[0035] (1) Surface modification of commercially available polyvinylidene fluoride membranes: first pre-wet the polyvinylidene fluoride membranes with ethanol, then soak the polyvinylidene fluoride membranes in 5 mg / mL tannic acid aqueous solution for 10 min, and then use The polyvinylidene fluoride membrane with tannic acid was rinsed with ion water, denoted as PVDF / TA membrane, and then transferred to FeCl with a concentration of 5mg / mL 3 ·6H 2 O aqueous solution for 10min, after washing with deionized water, dry at room temperature to obtain PVDF / TA-Fe(III) membrane;

[0036] (2) Preparation of self-cleaning membrane: the PVDF / TA-Fe(III) membrane is immersed in 0.6wt% FeCl 3 ·6H 2 O aqueous solution was incubated at 90°C for 12 h in a water bath, the membrane was taken out, rinsed with deionized water, and dried at 40°C to obtain a self-cleaning membrane, which was denoted as PVDF / TA / β-FeOOH.

[0037] figure 1 For PVDF, PVDF / TA-Fe(III) and the scanning electron microscop...

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Abstract

The invention belongs to the technical field of preparation of environmental functional materials, and particularly relates to a preparation method of a photo Fenton self-cleaning film and applicationthereof. The method comprises the following steps: pre-soaking a polyvinylidene fluoride film with ethanol, and then soaking the polyvinylidene fluoride film in a tannic acid aqueous solution to obtain a PVDF / TA film; cleaning the PVDF / TA film with deionized water, transferring the PVDF / TA film to a ferric trichloride hexahydrate aqueous solution for soaking, cleaning, and drying to obtain a PVDF / TA-Fe (III) film; soaking the PVDF / TA-Fe (III) film in the ferric trichloride hexahydrate aqueous solution, incubating at a certain water bath temperature, taking out the film, rinsing the PVDF / TA-Fe(III) film with deionized water, and drying to obtain the self-cleaning film material, which is recorded as PVDF / TA / beta-FeOOH. According to the invention, the photo-Fenton reaction is coupled with afilm separation technology, so that the anti-fouling performance of the film is improved; the photo Fenton self-cleaning film can effectively separate different oil-water emulsions, the film flux recovery rate within 10 min is as high as over 98%, the service life of the film is prolonged, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, and in particular relates to a preparation method and application of a photo-Fenton self-cleaning film. Background technique [0002] About three-quarters of the earth's surface is covered with water, a large part of which is saline or polluted water. Among them, the oily wastewater produced by industry, urban sewage and oil pollution from oil spill accidents pose a huge threat to the global environment and human safety. Oily wastewater is usually purified by various processes and methods such as oil skimmer, air flotation, coagulation and flocculation, centrifugal separation, and membrane separation. Among them, membrane separation is a high-efficiency, low-cost, no-secondary pollution, simple operation, and energy-saving oily wastewater treatment method. However, the fouling of the filter membrane limits its large-scale application in oily wastewater ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D71/36B01D71/50B01D71/68B01D67/00C02F1/44C02F1/72C02F1/30
Inventor 谢阿田崔久云杨瑾陈阳阳戴江栋李春香闫永胜
Owner JIANGSU UNIV
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