Preparation method of high-flux biological pollution resistant reverse osmosis membrane

An anti-biological fouling, reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc. Increase the anti-biofouling ability and application durability, save costs, and enhance the effect of anti-adsorption performance

Inactive Publication Date: 2019-06-14
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the activity of microorganisms, it is difficult to completely remove them by ordinary cleaning methods. Operation under the condition of membrane fouling will lead to a significant decrease in membrane flux and salt rejection rate, and increase energy consumption and cost.

Method used

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  • Preparation method of high-flux biological pollution resistant reverse osmosis membrane
  • Preparation method of high-flux biological pollution resistant reverse osmosis membrane
  • Preparation method of high-flux biological pollution resistant reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of aqueous phase solution: preparation of 1L aqueous solution of 2wt% m-phenylenediamine;

[0019] Prepare organic phase solution: prepare 1L of n-hexane solution of 0.2wt% trimesoyl chloride;

[0020] Preparation of silver nitrate solution: prepare 0.5L of silver nitrate solution with a concentration of 1mmol / L;

[0021] Preparation of dopamine solution: Dissolve dopamine in Tris-HCl buffer solution with a pH of 8.5 to prepare 0.5 L of dopamine solution with a concentration of 1 mmol / L, and then magnetically stir the dopamine solution at room temperature for 5 hours;

[0022] Weigh 150mg of carbon nanotubes, first add 150ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, ultrasonically oscillate for 1 hour, dilute the obtained solution with deionized water, filter it with a microporous membrane, and then use a large amount of deionized water The solid on the membrane was washed until the pH of the ...

Embodiment 2

[0026] Preparation of aqueous phase solution: prepare 0.5L of an aqueous solution of 3.5wt% m-phenylenediamine;

[0027] Preparation of organic phase solution: prepare 1L of n-hexane solution of 0.1wt% trimesoyl chloride;

[0028] Prepare silver nitrate solution: prepare 0.5L of silver nitrate solution with a concentration of 5mmol / L;

[0029] Prepare dopamine solution: dissolve dopamine in Tris-HCl buffer solution with a pH of 8.5, prepare 0.5 L of dopamine solution with a concentration of 5 mmol / L, and stir magnetically at room temperature for 5 h;

[0030] Weigh 180 mg of carbon nanotubes, first add 50 ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, and ultrasonically oscillate for 1 hour. The solid on the membrane was washed until the pH of the filtrate was 7, and the obtained black precipitate was vacuum-dried at 80° C. to obtain 160 mg of ultrasonically dispersed and acidified carbon nanotubes.

[0031] 150 ...

Embodiment 3

[0034] Preparation of aqueous phase solution: prepare 0.8L of an aqueous solution of 2.0wt% m-phenylenediamine;

[0035] Preparation of organic phase solution: prepare 1L of n-hexane solution of 0.15wt% trimesoyl chloride;

[0036] Preparation of silver nitrate solution: use 0.5L of silver nitrate solution with a concentration of 3mmol / L;

[0037] Preparation of dopamine solution: Dissolve dopamine in Tris-HCl buffer solution with a pH of 8.5, prepare 0.5 L of dopamine solution with a concentration of 2.5 mmol / L, and stir magnetically at room temperature for 5 hours;

[0038] Weigh 160 mg of multi-walled carbon nanotubes, first add 60 ml of a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 3:1, ultrasonically oscillate for 1 hour, dilute the obtained solution with deionized water, filter with a microporous membrane, and then use a large amount of The solid on the membrane was washed with ion water until the pH of the filtrate w...

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Abstract

The invention relates to a preparation method of a high-flux biological pollution resistant reverse osmosis membrane. The method comprises the following steps of sequentially performing interface polymerization reaction on a reverse osmosis membrane substrate through a water phase solution containing ultrasonically dispersed and acidified carbon nanometer tubes and an organic phase solution; then,uniformly coating the upper surface with a layer of silver nitrate solution; performing still standing for 10 to 15 min; finally coating a layer of polydopamine solution; performing still standing for 5 to 10 min; performing drying to obtain a high-flux biological pollution resistant reverse osmosis membrane. The ultrasonic dispersed and acidified carbon nanometer tubes are added into the water phase solution, so that the combination and dispersion capability of the carbon nanometer tubes and the water phase can be enhanced; a unique water passage is built on the reverse osmosis membrane; thecoated nanometer silver ions are powerfully combined onto the surface of the reverse osmosis membrane through the quinoid structure of the polydopamine; the biological pollution resistant capabilityof the reverse osmosis membrane in the use process is enhanced. The water contact angle of the prepared reverse osmosis membrane is reduced from 70 degrees to 40 to 25 degrees; the water flux is improved to 50 to 70 L/m<2>.h; the process is simple and proper; the operation is easy; the method can be widely applied to industrialized waste water treatment.

Description

technical field [0001] The invention belongs to the technical field of preparation of reverse osmosis membranes, and in particular relates to a preparation method of a high-throughput anti-biological pollution reverse osmosis membrane. Background technique [0002] The shortage of fresh water resources, water pollution caused by rapid industrial and agricultural development, and large-scale seawater desalination have become severe challenges for water treatment technology. In order to meet the ever-increasing demand for fresh water, more efficient and high-quality water treatment processes need to be sought. As one of the most promising treatment technologies for producing high-quality water, membrane separation technology has gradually attracted people's attention. Among them, reverse osmosis is widely used in seawater desalination, wastewater treatment, and drinking water production due to its unique effects. However, reverse osmosis has a serious defect. Because its trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D61/02C02F1/44
Inventor 李睿涵黄万抚李新冬袁佳彬李柳张鑫
Owner JIANGXI UNIV OF SCI & TECH
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