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Cellulose acetate/functionalized graphene mixed media hollow fiber positive osmotic membrane

A cellulose acetate, forward osmosis membrane technology, applied in semi-permeable membrane separation, membrane technology, chemical instruments and methods, etc., to achieve the effect of improving performance, large membrane area and flux per unit volume, and good spinning performance

Inactive Publication Date: 2015-09-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The forward osmosis membrane prepared by HTI company using cellulose acetate and cellulose triacetate has entered the stage of commercial application. These membranes have good rejection characteristics. Water flux is often less than 20 L / m2·h
The present invention uses functionalized graphene to prepare hollow fiber forward osmosis membranes to improve the structure and hydrophilicity of forward osmosis membranes, which have not been reported in the literature at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First add 1.0% (w / w) functionalized graphene to 63.0% (w / w) N-methylpyrrolidone and 1,4-dioxane (N-methylpyrrolidone and 1,4-dioxane The volume ratio of the ring is 1:0.8) in the mixed solvent, and the functionalized graphene is uniformly dispersed in it by ultrasound, and then 6.0% (w / w) polyethylene glycol / lithium chloride composite additive (volume ratio of 7 : 1) Add it into the dissolution tank, stir evenly for 5 minutes, then add 30% cellulose acetate, fully stir and stand at 60°C to obtain the casting solution.

[0023] Then, the obtained casting solution was left to stand still for 24 hours at the reaction temperature to remove residual bubbles in the casting solution;

[0024] Squeeze the casting liquid in the material tank into the annulus of the nozzle through the metering pump under the pressure of 0.05-0.5MPa; at the same time, the internal coagulation bath enters the insertion pipe of the nozzle through the constant flow pump, and the formed primary After...

Embodiment 2

[0026] The proportions of functionalized graphene and cellulose acetate were adjusted to 3.0% (w / w) and 28.0% (w / w), and the rest were the same as in Example 1. The obtained forward osmosis membrane uses 1M NaCl as the driving solution and deionized water as the raw material solution, and its pure water flux reaches 19.5L / m in the test time of 1h 2 More than h, the reverse salt flux is less than 4.1g / m 2 h, the surface contact angle is 56.3°.

Embodiment 3

[0028] Adjust the ratio of polyethylene glycol / lithium chloride composite additive to 10.0% (w / w), and the ratio of mixed solvent to 59.0% (adjust the volume ratio of N-methylpyrrolidone and 1,4-dioxane 1:2.0), and the rest are the same as in Example 1. The obtained forward osmosis membrane uses 1M NaCl as the driving solution and deionized water as the raw material solution, and its pure water flux reaches 18.7L / m in the test time of 1h 2 For more than h, the reverse salt flux is 4.5g / m2 2 h, the surface contact angle is 57.8°.

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PUM

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Abstract

The invention discloses a cellulose acetate / functionalized graphene mixed media hollow fiber positive osmotic membrane. 0.05-3.0% (w / w) of graphene is added into a solution composed of N-methyl-pyrrolidone or dimethylacetamide or dimethylformamide and 1,4-dioxane, 2.0-20.0% (w / w) of a polyethylene glycol or polyvinylpyrrolidone / lithium chloride composite additive with a volume ratio of 7:1 is added, stirring is carried out for 15-60min, then 10.0-35.0% (w / w) of cellulose acetate is added, stirring is carried out, the mixture is allowed to stand, and a casting film solution. The casting film solution is squeezed into an annular gap of a nozzle, goes through an air gap of 2-20cm, and goes into deionized water with a temperature of 20-60 DEG C, solidification is carried out, and a positive osmotic membrane is obtained after washing. When 1M of NaCl is employed as a drive liquid and deionized water is employed as a raw material liquid, the water flux is 18.3L / m2h, the reverse salt flux is less than 3.3g / m2h, and the contact angle is 57.5 degrees.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a hollow fiber forward osmosis membrane prepared by blending cellulose acetate membrane material and functionalized graphene. Background technique [0002] my country is a country with a large population, and there is a large demand for water resources. The shortage of per capita water consumption has long been a major issue of concern. In recent years, with the growth of the world population and the rapid development of social and economic conditions, the demand for water is increasing day by day, and the phenomenon of relative lack of water resources has become more and more serious. In some areas, the shortage of water resources has become a threat One of the important reasons for human survival and economic development. According to reports, there are currently 1.2 billion people in the world who lack safe and clean drinking water. In Africa, the annual economic loss ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/08B01D67/00B01D69/02
Inventor 史新莲王立国李媛王秀菊王仲鹏何芳逯鹏杨建华赵薇
Owner UNIV OF JINAN
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