Preparation and application of graphene oxide-modified cellulose acetate forward osmosis membrane

A cellulose acetate and graphene modification technology, applied in the field of membrane separation, can solve the problems of little research on forward osmosis membranes, adverse effects on the structure and performance of hybrid membranes, low water flux, etc., and achieve stable membrane flux and Salt interception rate, enhanced anti-pollution ability, and high salt interception rate effect

Inactive Publication Date: 2016-09-07
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the 1960s, Loeb first prepared the forward osmosis membrane by the phase inversion method, but in the process of applying it to the forward osmosis, it could not be applied due to the extremely low water flux. Later, the research on the preparation of the forward osmosis membrane little
[0006] In the existing method for preparing the forward osmosis membrane, the prepared organic forward osmosis membrane has poor hydrophilicity, large internal concentration polarization, small permeation flux, low rejection rate and poor antibacterial property, low strength of the membrane, and low practical performance. not good
Inorganic nanoparticles have high surface energy and large specific surface area, which makes them prone to agglomeration, which has an adverse effect on the structure and performance of the hybrid membrane, and the interaction between the organic and inorganic phases is weak. The inorganic nanoparticles added during the long-term use of the membrane Nanoparticles are easy to lose, causing secondary pollution

Method used

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  • Preparation and application of graphene oxide-modified cellulose acetate forward osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Graphene oxide powder was purchased from Nanjing Xianfeng Nano Material Technology Co., Ltd., with a sheet diameter of 0.5-5 μm, a thickness of 0.8-1.2 nm, and a single layer.

[0037] 0.005 parts by mass of graphene oxide powder was added to 6.6 parts by mass of lactic acid (analytical pure), sealed and vibrated at room temperature for 2 hours, and then ultrasonicated in an ultrasonic field with a frequency of 60 kHz and a temperature of 25°C for 2 hours , the graphene oxide is fully and uniformly dispersed, then add 72.395 parts by mass of N-methyl-2-pyrrolidone (NMP) and a polymer mixed solvent of 5 parts by mass of acetone, and add 16 parts by mass of diacetone after sealing and shaking for 0.5 hours. Cellulose acetate (CA), then sealed and shaken at a temperature of 25°C for 20 hours until the cellulose acetate was fully dissolved, was prepared as a graphene oxide modified cellulose acetate forward osmosis membrane casting solution (100 parts by mass).

[0038] Put...

Embodiment 2

[0043]The proportion of cellulose acetate was adjusted to 13%, the proportions of N-methyl-2-pyrrolidone (NMP) and acetone were adjusted to 73.395 parts by mass and 7 parts by mass respectively, and the rest of the operations were the same as in Example 1.

[0044] The performance of the graphene oxide modified cellulose acetate forward osmosis membrane prepared in this example is as follows: using 1mol / L NaCl solution as the driving solution and deionized water as the raw material solution, in the test time of 1h, the prepared membrane Pure water flux is 21.8L / (m 2 h), the reverse salt flux is less than 4.8g / (m 2 h).

Embodiment 3

[0046] The proportions of graphene oxide and acetone were adjusted to 0.03 parts by mass and 4.975 parts by mass respectively, and the rest of the operations were the same as in Example 1.

[0047] The performance of the graphene oxide modified cellulose acetate forward osmosis membrane prepared in this example is as follows: using 1mol / L NaCl solution as the driving solution and deionized water as the raw material solution, in the test time of 1h, the prepared membrane Pure water flux is 30L / (m 2 h), the reverse salt flux is 6.5g / (m 2 h).

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Abstract

The invention provides a preparation method of graphene oxide-modified cellulose acetate forward osmosis membrane. The preparation method comprises the following steps of adding graphene oxide into lactic acid or polyethylene glycol, oscillating, and dispersing by ultrasonic wave, so as to obtain a graphene oxide additive solution; adding cellulose acetate into the graphene oxide additive solution, oscillating or stirring and dissolving for 12-24h at the temperature of 5-60 DEG C until the cellulose acetate is fully dissolved, stilling the prepared graphene oxide-modified cellulose acetate osmosis membrane casting liquid for 5-12h at the normal temperature, and completely defoaming the membrane casting liquid; paving the prepared graphene oxide-modified cellulose acetate osmosis membrane casting liquid on a flat plate paved with a support layer to form the membrane. The preparation method has the advantages that by utilizing the good water transfer promoting function of graphene oxide, the cellulose acetate forward osmosis membrane material is modified, the stable membrane flux and salt rejection rate are obtained, and the anti-pollution capability of the membrane is improved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a graphene-modified permeable membrane, its preparation method and application. Background technique [0002] As an emerging technology, forward osmosis membrane water treatment technology is widely used in the research of seawater desalination, wastewater treatment, food processing, energy development, etc. Forward osmosis is a method of using a high-concentration draw solution to generate high osmotic pressure, so that the water on the low-concentration original solution side passes through the semi-permeable membrane, and then separates the water in the diluted draw solution to obtain pure water. Compared with reverse osmosis, forward osmosis technology has the advantages of low pollution, low energy consumption and high recovery. In the 1960s, Loeb first prepared the forward osmosis membrane by the phase inversion method, but in the process of applyin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D71/16B01D67/00B01D69/02
CPCB01D71/021B01D67/0079B01D69/02B01D71/16B01D2325/24
Inventor 伦小秀赵露李俊仪马伟芳
Owner BEIJING FORESTRY UNIVERSITY
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