Modified PVDF membrane and preparation method thereof

A modified and viscous liquid technology, which is applied in the field of membrane separation technology and photocatalysis, can solve the problems of environmental pollution, ignoring catalyst recovery and recycling, etc., and achieve the effect of easy availability of raw materials, good application prospects, and simple preparation process

Active Publication Date: 2020-12-11
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extensive use of tetracycline antibiotics has caused environmental pollution, and the research on their biodegradation mechanism and degradation methods is increasing and gradually deepening. Photocatalysis is currently a relatively effective and simple degradation method, but the research focuses on the photocatalytic effect of catalysts, often ignoring the use of catalysts. recovery and recycling of

Method used

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  • Modified PVDF membrane and preparation method thereof
  • Modified PVDF membrane and preparation method thereof
  • Modified PVDF membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Graphene oxide was prepared by the modified Hummers method, which was divided into three stages:

[0045] Low temperature stage: Dissolve 1.2g graphite powder and 0.5g sodium nitrate in 150ml mixed acid solution (135ml concentrated H 2 SO 4 +15ml concentrated H 3 PO 4 ), stir at below 20°C for 0.5h, keep the temperature below 20°C, then slowly add 7g of potassium permanganate, and stir for 1h;

[0046] Medium temperature stage: raise the temperature to 35°C, stir for 2 hours, then slowly add the solution to 150ml of ice water;

[0047] High temperature stage: raise the temperature to 90°C, after continuous heating for 20 minutes, the solution turns brownish yellow and produces red smoke, stop heating and add 5ml H 2 o 2 (concentration is 30%), until solution turns golden yellow;

[0048] The resulting solution was allowed to stand overnight, the supernatant was decanted, the lower turbid liquid was centrifuged (12000 rpm, 10 min), and the resulting solid was washe...

Embodiment 2

[0055] Preparation of emulsion

[0056] Preparation of oil-in-water emulsion: take 0.5g of gasoline, 0.05g of sodium dodecylsulfonate, and 1L of deionized water and stir and mix, put the mixture into an ultrasonic device, and ultrasonicate for 2 hours at room temperature to obtain uniformly emulsified oil-water Emulsion, the prepared emulsion is milky white and is oil-in-water type. After standing for 24 hours, the emulsion has no obvious change, indicating that the emulsified structure has stability.

Embodiment 3

[0058] Oil-Water Separation Experiment

[0059] Heavy oil: nitrobenzene, dichloromethane, chloroform, benzyl alcohol; light oil: toluene, cyclohexane, p-xylene, gasoline. Take 5ml of various organic phases and 40ml of water (stained by methylene blue) and mix them into a special device, see Figure 5 , calculate the oil flux of various organic substances, and compare the blank membrane with the composite membrane. Compared with the blank membrane, the oil-water separation effect of the composite membrane added with catalyst is significantly improved. The oil flux of nitrobenzene and chloroform is about 1.2×10 5 and 1.37×10 5 mg·m -2 h -1 . In order to test the recycling effect of materials, repeated tests were carried out with chloroform as the separation object.

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Abstract

The invention discloses a modified PVDF membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The membrane takes glass fiber as a skeleton, PVDF as a main body and GO @MIL-101-NH2 as a core, and the method comprises the following steps: firstly preparing graphene oxide, then preparing GO@MIL-101-NH2 (Fe) by adopting a one-pot method, and then preparing a composite membrane. The membrane prepared by the method can be used for oil-water separation and photocatalytic degradation of tetracycline organic matters in the emulsion, and compared with theprior art, the preparation process is simple, the raw materials are easy to obtain, large-scale preparation can be realized, and the material can be repeatedly used.

Description

technical field [0001] The invention relates to the fields of membrane separation technology and photocatalysis technology, in particular to a modified PVDF membrane and a preparation method. Background technique [0002] Membrane separation technology has been widely favored at home and abroad because of its simple structure, convenient operation, ability to separate various substances in water, and operation at room temperature. It has the advantages of environmental protection, energy saving, low energy consumption, and low cost. Membrane materials are the basis of membrane separation technology and the key factor for the industrialization of membrane technology. However, serious membrane fouling (organic fouling, inorganic fouling, and biological fouling) is prone to occur during the membrane separation process, leading to increased membrane resistance and decreased membrane flux, leading to deterioration of effluent quality. It is necessary to increase the amount of ae...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D69/02B01D67/00B01D61/40B01D17/04C02F1/32C02F1/44C02F1/72B01J31/22C02F101/30
CPCB01D17/04B01D61/40B01D67/0079B01D69/02B01D69/12B01D71/024B01D71/027B01D71/06B01D71/34B01D2325/10B01J31/1691B01J31/2243B01J35/004B01J2531/0213B01J2531/842C02F1/32C02F1/44C02F1/722C02F1/725C02F2101/30C02F2305/10
Inventor 李慧军徐周庆闫玲玲刘宪云毕宁
Owner HENAN POLYTECHNIC UNIV
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