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High-performance flat-type cellulose acetate/graphene blend forward osmosis 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 high water flux and high hydrophilicity

Active Publication Date: 2015-04-01
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses graphene 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

[0021] Add 0.25% (W / W) graphene oxide to 47.5% (W / W) dimethylformamide, and use ultrasound at room temperature to fully and uniformly disperse graphene oxide (its sheet diameter is 200nm) in it After the dispersion is completed, add it to the dissolving tank, then add 28.25% (W / W) acetone and 8.0% (W / W) polyethylene glycol (PEG 400) into the dissolving tank successively, and stir evenly for 30 minutes Add 16% (W / W) cellulose acetate, stir and dissolve at 30°C for 6 hours until fully uniform, and prepare a high-performance flat cellulose acetate / graphene blended forward osmosis membrane casting solution. Then, the obtained casting solution was left to stand still at the reaction temperature for 12 hours to remove the remaining air bubbles in the casting solution. Finally, pour a certain amount of casting liquid into a glass plate covered with a 120-mesh polyester screen, scrape it with a flat film scraper to form a film, and immerse it in a constant temperature coagulation bath...

Embodiment 2

[0023] Adjust the proportions of graphene oxide and acetone to 0.15% (W / W) and 28.35% (W / W) respectively, and the rest are the same as in Example 1. Then the performance of the obtained high-performance flat cellulose acetate / graphene blended forward osmosis membrane is: using 1M NaCl as the driving solution, deionized water as the raw material solution, in the test time of 1h, the purity of the prepared membrane Water flux greater than 17.5L / m 2 h, the reverse salt flux is less than 5.0g / m 2 h.

Embodiment 3

[0025]Adjust the proportion of polyethylene glycol PEG400 to 5% (W / W), the proportions of dimethylformamide and acetone to 49% (W / W) and 29.75% (W / W) respectively, and the rest are implemented in the same way example 1. Then the performance of the obtained high-performance flat cellulose acetate / graphene blended forward osmosis membrane is: using 1M NaCl as the driving solution, deionized water as the raw material solution, in the test time of 1h, the purity of the prepared membrane Water flux greater than 16.0L / m 2 h, the reverse salt flux is less than 5.0g / m 2 h.

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Abstract

The invention discloses a high-performance flat-type cellulose acetate / graphene blend forward osmosis membrane. 5 to 25 percent by weight of cellulose acetate, 1 to 15 percent by weight of additives, 0.01 to 2 percent by weight of graphene and mixed solvent of dimethylformamide, dimethylacetamide, or N-methylpyrrolidone and acetone are added into a dissolving tank according to a given sequence and are stirred and dissolved for 2 to 18 hours at the temperature of 5 to 75 DEG C to be uniformly mixed so as to prepare a forward osmosis membrane casting solution; the high-performance flat-type cellulose acetate / graphene blend forward osmosis membrane is prepared on a supporting material by adopting a phase inversion method. According to the forward osmosis membrane, 1M NaCl is used as a driving liquid, the deionized water is used as a raw material solution, the flux of pure water of the forward osmosis membrane is more than 21L / m<2> within the test time of one hour, and the salt flux in the reverse direction is less than 3.5g / m<2>.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a high-performance flat cellulose acetate / graphene blended forward osmosis membrane. Background technique [0002] The scarcity of water resources has become a bottleneck restricting social progress and economic development, and the development of new water sources has also become a global concern. Due to the extremely rich water resources in Shanghai, seawater desalination has become a strategic choice to solve the water resource crisis. At present, commercial seawater desalination technologies mainly include thermal method and membrane method. Reverse osmosis seawater desalination has become one of the most important seawater desalination technologies, but its operating pressure is high, energy consumption is large, membrane service life is short, and water recovery rate The low and other disadvantages show that the reverse osmosis seawater desalination has relatively small ...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D69/10B01D69/06B01D67/00B01D69/02
Inventor 王立国史新莲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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