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Preparation method of hydrophobic modified graphene oxide reverse osmosis membrane

A technology of hydrophobic modification and reverse osmosis membrane, which is applied in chemical instruments and methods, reverse osmosis, semi-permeable membrane separation, etc. It can solve the problems of easy agglomeration and low GO content, and achieve the goal of hindering agglomeration tendency, high flux and high Effect of Salt Rejection

Active Publication Date: 2020-06-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GO is a hydrophilic substance, and it seems more appropriate to add GO to the water phase, but since the interfacial polymerization process is the diffusion of MPD molecules in the water phase to the TMC in the oil phase, the content of GO in the mixed matrix may be too low; for example, adding GO Adding it into the oil phase can theoretically increase the amount of GO in the mixed matrix, but GO is easy to agglomerate in the oil phase, which requires functional modification of graphene oxide, the purpose of which is to make graphene oxide uniformly dispersed in in organic solvent

Method used

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  • Preparation method of hydrophobic modified graphene oxide reverse osmosis membrane
  • Preparation method of hydrophobic modified graphene oxide reverse osmosis membrane
  • Preparation method of hydrophobic modified graphene oxide reverse osmosis membrane

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0042] According to the condition that the mass ratio of octadecylamine to graphene oxide is 3:2, add 10 mg / mL octadecylamine ethanol solution (water bath ultrasonication for 10 min) to 2 mg / mL GO suspension (water bath ultrasonication for 1 h), stir for 5 min and place Reaction in the reactor at 90°C for 24h. Rinse with ethanol, and after centrifugation, take the precipitate and place it in a vacuum drying oven, and dry it at 50°C for 24h. The obtained black solid powder is octadecylamine-modified graphene oxide.

Embodiment 2

[0044] 1) Prepare MPD aqueous solution (2wt%), and prepare TMC n-hexane solution (0.1wt%). Wherein, 4wt% camphorsulfonic acid (CSA) and an appropriate amount of triethylamine buffer system are added to 2wt% MPD aqueous phase to make pH=10.

[0045] 2) According to the concentration ratio of 0.001wt%, the octadecylamine-modified GO prepared according to the method of Example 1 was added to the organic solution of 0.1wt% TMC, and the water bath was ultrasonicated for one hour at room temperature.

[0046]3) Select a PSF base film with no scratches and defects on the surface, clean it and tighten it, cut it and fix it, clean it again and place it on the operating table, and put the non-woven fabric layer outward and dry it until no water drops remain on the surface of the film.

[0047] 4) Pour the MPD aqueous solution prepared in step 1) into the surface of the prepared PSF base film, and let the entire film surface be submerged. After standing for 2 minutes, pour out the excess...

Embodiment 3

[0051] Referring to Example 2, the only difference is that the concentration of modified GO in the organic solution of TMC prepared in step 2) is 0.003wt%, and a mixed matrix reverse osmosis membrane is prepared.

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Abstract

The invention discloses a preparation method of a hydrophobically modified graphene oxide reverse osmosis membrane. The preparation method comprises the following steps: with a polysulfone ultrafiltration membrane as a base membrane, m-phenylenediamine as a water-phase monomer, trimesoyl chloride as an oil-phase monomer, octadecylamine modified graphene oxide as an oil-phase additive and n-hexaneas an oil-phase solvent, preparing the hydrophobic modified graphene oxide reverse osmosis membrane by adopting an interfacial polymerization method. Octadecylamine modified graphene oxide is used asan oil phase additive, so that the problem of dispersion of graphene oxide in an oil phase is successfully solved, and the prepared reverse osmosis membrane has high flux and high salt rejection rate.

Description

[0001] (1) Technical field [0002] The invention relates to a method for preparing a hydrophobically modified graphene oxide reverse osmosis membrane. [0003] (2) Background technology [0004] The global scarcity of freshwater resources has prompted extensive research on reverse osmosis (RO) desalination technology. RO technology is an energy-saving and efficient material separation technology. Its principle is to separate the solvent and the solute in the solution by using the selective permeation characteristics of the reverse osmosis membrane under the application of an osmotic pressure higher than that of the solution. Compared with conventional technology, it has the advantages of simple operation, high water flux, low energy consumption and less chemical demand. RO technology has experienced 50 years of rapid development since the 1960s, from cellulose acetate membranes, aromatic polyamide membranes to nanocomposite membranes. Generally, the thin-layer composite reve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/68B01D61/02
CPCB01D71/024B01D71/68B01D69/02B01D67/0079B01D61/025
Inventor 宋潇潇巫碧勤周勇高从堦
Owner ZHEJIANG UNIV OF TECH
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