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Cellulose acetate/nano titanium dioxide mixed media hollow fiber positive osmotic membrane

A technology of nano-titanium dioxide and cellulose acetate, applied in the direction of semi-permeable membrane separation, membrane technology, chemical instruments and methods, etc., to achieve good spinning performance, improved performance, and simple process

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 nano-titanium dioxide to prepare hollow fiber membranes to improve the structure and hydrophilicity of forward osmosis membranes, which has 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

[0017] Add 2.0% (w / w) nano titanium dioxide, 0.1% (w / w) graphene oxide to 55.9% (w / w) N-methylpyrrolidone and 1,4-dioxane (N-methyl In the solvent composed of pyrrolidone: 1,4-dioxane=1:0.8), the nano-titanium dioxide was fully and uniformly dispersed in it by ultrasound, and then 10.0% (w / w) additive was added into the dissolution tank and stirred evenly for 15 Min later, add 32.0% (w / w) cellulose acetate, fully stir and stand at 60°C to obtain the casting solution; then, stand the obtained casting solution at the reaction temperature for 24 hours, remove the casting solution The remaining air bubbles in the tank; the casting solution in the tank is squeezed into the annulus of the nozzle through the metering pump under the pressure of 0.05-0.5MPa; the formed primary fibers leave the nozzle and pass through the 5cm air gap into the 30 ℃ Coagulate in the external coagulation tank of deionized water, fully solidify the hollow fiber extruded from the spinneret in the coagulation...

Embodiment 2

[0019] The proportions of nano-titanium dioxide and cellulose acetate were adjusted to 4.0% (w / w) and 30.0% (w / w), and the rest were the same as in Example 1. The obtained cellulose acetate / nano-titanium dioxide blended hollow fiber forward osmosis membrane uses 1M NaCl as the driving solution and deionized water as the raw material solution, and its pure water flux reaches 18.3L / m in the test time of 1h 2 More than h, the reverse salt flux is less than 4.0g / m 2 h, the surface contact angle is 58.2°.

Embodiment 3

[0021] Adjust the ratio of polyethylene glycol / lithium chloride composite additive to 8.0% (w / w), and the ratio of N-methylpyrrolidone and 1,4-dioxane mixed solvent to 57.9% (w / w) (N-methylpyrrolidone: 1,4-dioxane=1:2.0), and the rest are the same as in Example 1. The obtained cellulose acetate / nano-titanium dioxide blended hollow fiber forward osmosis membrane uses 1M NaCl as the driving solution and deionized water as the raw material solution, and its pure water flux reaches 15.6L / m in the test time of 1h 2 More than h, the reverse salt flux is less than 3.9g / m 2 h, the surface contact angle is 60.8°.

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Abstract

The invention discloses a cellulose acetate / nano titanium dioxide mixed media hollow fiber positive osmotic membrane. 0.05-4.0% (w / w) of nano titanium dioxide and 0.01-1.0% (w / w) of oxidized graphene are added into a solution composed of N-methyl-pyrrolidone or dimethylacetamide or dimethylformamide and 1,4-dioxane, 3.0-21.0% (w / w) of additives is added, uniform stirring is carried out for 5-60min, then 15.0-40.0% (w / w) of cellulose acetate is added, full stirring is carried out at a temperature of 20-70 DEG C, the mixture is allowed to stand, and a hollow fiber positive osmotic membrane is obtained through spinning. The osmotic membrane employs 1M of NaCl as a drive liquid and deionized water as a raw material liquid, the water flux is 16.5L / m2h, the reverse salt flux is less than 3.5g / m2h, and the contact angle is 60.2 degrees in test time of 1h.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to the preparation technology of an organic-nano particle mixed matrix hollow fiber membrane, specifically a mixed matrix hollow fiber forward osmosis membrane prepared by blending cellulose acetate membrane material and nano titanium dioxide. Background technique [0002] In recent years, with the growth of 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 is becoming more and more serious. In some areas, the shortage of water resources has become a threat to human survival. and one of the important reasons for 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 caused by water shortage and water quality problems is as high as 28 bil...

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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