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High-performance flat plate type cellulose acetate/nano-titanium dioxide blended forward osmosis 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 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 nano-titanium dioxide 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 1.5% (W / W) nano-titanium dioxide (anatase type, particle size 30nm) and 0.1% (w / w) graphene oxide (its sheet size is 200nm) to 46.0% (W / W) di In methylformamide (DMF), nano-titanium dioxide was fully and uniformly dispersed in it by ultrasound at room temperature, and added to the dissolution tank after the dispersion was completed, followed by 27.4% (W / W) acetone, 9.0% (W / W) W) polyethylene glycol (PEG400) was added to the dissolving tank, stirred evenly for 30 minutes, then 16% (W / W) cellulose acetate was added, stirred and dissolved at 55°C for 6 hours until fully uniform, and a high-performance tablet was prepared Formula cellulose acetate / nano-titanium dioxide 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 ...

Embodiment 2

[0023]The proportions of nano-titanium dioxide and acetone were adjusted to 1.0% (W / W) and 27.9% (W / W) respectively, and the rest were the same as in Example 1. Then the performance of the obtained high-performance flat cellulose acetate / nano-titanium dioxide blended forward osmosis membrane is: using 1M NaCl as the driving solution and deionized water as the raw material solution, in the test time of 1h, the purity of the prepared membrane Water flux greater than 15.5L / m 2 h, the reverse salt flux is less than 3.5g / m 2 h.

Embodiment 3

[0025] Adjust the proportion of polyethylene glycol PEG400 to 6% (W / W), adjust the proportions of dimethylformamide and acetone to 47.5% (W / W) and 28.9% (W / W) respectively, and implement the rest in the same way example 1. Then the performance of the obtained high-performance flat cellulose acetate / nano-titanium dioxide blended forward osmosis membrane is: using 1M NaCl as the driving solution and deionized water as the raw material solution, in the test time of 1h, the purity of the prepared membrane Water flux greater than 15.0L / m 2 h, the reverse salt flux is less than 3.0g / m 2 h.

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Abstract

The invention discloses a high-performance flat plate type cellulose acetate / nano-titanium dioxide blended forward osmosis membrane, which is prepared by comprising the following steps: adding the following raw materials in percentage by weight: 7.0%-26.0% of cellulose acetate, 2.0%-16.0% of additives, 0.1%-5.0% of nano-titanium dioxide, 0.05%-0.1% of graphene, and a dimethylformamide or dimethylacetamide, N-methylpyrrolidine and acetone mixed solvent into a dissolving tank according to certain sequence, stirring and dissolving for 3-15h to be full and even at 25-90DEG C, thus obtaining blended forward osmosis membrane casting liquid; and preparing the high-performance flat plate type cellulose acetate / nano-titanium dioxide blended forward osmosis membrane on a supporting material by using a phase conversion method. According to the prepared forward osmosis membrane, 1M NaCl and deionized water are respectively taken as driving liquid and feed solution, the flux of pure water can reach more than 17.5L / m<2>.h during testing time of1h and the backward salt flux is less than 3.0g / m<2>.h.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a high-performance flat cellulose acetate / nano titanium dioxide 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 rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/10B01D69/06B01D67/00
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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