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Preparing method of high-performance graphene oxide/halloysite nanotube composite water-oil separation film

A halloysite nanotube, water and oil separation technology, applied in the field of functional membranes, can solve problems such as poor anti-fouling performance, and achieve the effects of small structural damage, high oxidation degree, and low oxidation degree

Inactive Publication Date: 2017-09-08
ANHUI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a method for preparing a high-performance graphene oxide / halloysite nanotube composite water-oil separation membrane. The technical problem to be solved is the low water flux and poor antifouling performance of the simple graphene oxide membrane , the layered structure is constructed by loading halloysite nanotubes with a hollow structure, so that the graphene oxide / halloysite nanotube composite membrane not only has high water flux and antifouling performance, but also has a high water-oil separation efficiency

Method used

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  • Preparing method of high-performance graphene oxide/halloysite nanotube composite water-oil separation film
  • Preparing method of high-performance graphene oxide/halloysite nanotube composite water-oil separation film
  • Preparing method of high-performance graphene oxide/halloysite nanotube composite water-oil separation film

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Embodiment 1

[0035] This embodiment prepares graphene oxide / halloysite nanotube composite water-oil separation membrane according to the following steps:

[0036] 1. Preparation of sheet-layer graphene oxide

[0037] Mix 2g graphite powder with 1g NaNO 3 Add the powder into a three-necked flask, and then add 50 mL of concentrated H with a mass concentration of 98%. 2 SO 4 , with magnetic stirring in an ice-water bath, 6g KMnO 4The solid particles were added to the three-necked flask in batches at 5°C, and after the addition was completed, the temperature was raised to 35°C and stirred for 24 hours; after the reaction, 100mL of deionized water was added to the reaction solution, and 250mL of deionized water was added after mixing evenly, and then Add 15mL of 30wt% hydrogen peroxide dropwise to the reaction solution, then add 200mL of 1mol / L HCl solution, stir and mix evenly, then centrifuge at a speed of 4500r / min, remove the supernatant, wash with water and centrifuge the precipitate un...

Embodiment 2

[0044] In this embodiment, the graphene oxide / halloysite nanotube composite water-oil separation membrane is prepared according to the same method as in Example 1, the difference is only that the mass ratio of sheet-layer graphene oxide to halloysite nanotube is 1:4 in step 3, The obtained composite water-oil separation membrane is denoted as GOH (GO:HNTs=1:4).

Embodiment 3

[0046] In this embodiment, the graphene oxide / halloysite nanotube composite water-oil separation membrane is prepared according to the same method as in Example 1, the difference is only that the mass ratio of sheet-layer graphene oxide to halloysite nanotube is 1:6 in step 3, The obtained composite water-oil separation membrane is denoted as GOH (GO:HNTs=1:6).

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Abstract

The invention discloses a preparing method of high-performance graphene oxide / halloysite nanotube composite water-oil separation film. The preparing method is characterized by comprising the steps of firstly preparing lamella graphene oxide through an improved Hummer method, purifying a halloysite nanotube through acid treatment, then mixing the lamella graphene oxide and the halloysite nanotube into a composite solution, and then adopting a vacuum filtration method to make the composite solution into film through suction filtration to prepare the graphene oxide / halloysite nanotube composite water-oil separation film. In the prepared high-performance graphene oxide / halloysite nanotube composite water-oil separation film, the halloysite nanotube is introduced, the water flux can be greatly increased, and the anti-dirt performance is improved at the same time; meanwhile, the high-performance graphene oxide / halloysite nanotube composite water-oil separation film has a good separation effect on water-oil emulsion.

Description

technical field [0001] The invention relates to a preparation method of a composite membrane, in particular to a preparation method of a high-performance graphene oxide / halloysite nanotube composite water-oil separation membrane, belonging to the field of functional membranes. Background technique [0002] Due to the increase of industrial oily wastewater and frequent oil spill accidents, oil-water separation has become a worldwide challenge, especially for water-oil emulsions in the presence of surfactants, which are difficult to separate by traditional methods. Due to the advantages of small equipment, simple operation, low energy consumption and wide application range, membrane separation technology is widely used in the separation of water-oil emulsion. However, the surface of the membrane is easily polluted, resulting in the deposition of oil droplets on the membrane surface and membrane pores, which greatly limits the water-oil separation efficiency of the membrane. I...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00B01D69/02C02F1/40C01B32/198
CPCB01D67/0039B01D69/02B01D71/021B01D2325/24
Inventor 周艺峰朱瑶陈鹏鹏聂王焰
Owner ANHUI UNIVERSITY
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