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Preparation method of hybrid high performance reverse osmosis membrane based on dopamine modified nanoparticles

A nanoparticle, reverse osmosis membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, osmosis/dialysis water/sewage treatment, etc. Simple operation method and good experimental repeatability

Inactive Publication Date: 2019-10-18
浙江海纳环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, the research on reverse osmosis composite membranes has mainly focused on the optimization of interfacial polymerization membrane conditions, the synthesis of new functional monomers, and surface modification to improve the separation performance, oxidation resistance and anti-pollution performance of the membrane, but there is no make leaps and bounds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Configuration mass fraction of 0.5% DOPA and 0.5% nano-SiO2 aqueous solution stirred for 48h, the modified nanoparticles were separated and dried, configuration mass fraction of 2% m-phenylenediamine aqueous solution and adding mass fraction of 0.5% poly Dopamine-modified SiO2, 2% triethylamine hydrochloride, and 0.5% triethylamine are mixed evenly and evenly coated on the diaphragm. After drying in the shade, configure 0.2% trimesoyl chloride (TMC) oil phase solution, evenly coat the diaphragm, and heat-treat in an oven at 120°C for 5 minutes. The high-performance reverse osmosis membrane based on dopamine-modified nanoparticle hybrid prepared by this method was tested at a test pressure of 1.05MPa, a concentrated water flow rate of 1.0L / min, an ambient temperature of 25°C, and a concentrated water pH value of 6.5-6. 7.5, Concentrated water is sodium chloride aqueous solution, under the experimental conditions with a concentration of 1000ppm, the measured water flux is...

Embodiment 2

[0028]Configure DOPA with a mass fraction of 0.5%, 0.5% nano-SiO2 aqueous solution, 0.5% TiO2, stir for 48 hours, separate and dry the modified nanoparticles, configure a mass fraction of 2% m-phenylenediamine aqueous solution and add a mass fraction 0.5% polydopamine modified SiO2, TiO2, 2% triethylamine hydrochloride, 0.5% triethylamine, mixed evenly, and evenly coated on the diaphragm. After drying in the shade, configure 0.2% trimesoyl chloride (TMC) oil phase solution, evenly coat the diaphragm, and heat-treat in an oven at 120°C for 5 minutes. The high-performance reverse osmosis membrane based on dopamine-modified nanoparticle hybrid prepared by this method was tested at a test pressure of 1.05MPa, a concentrated water flow rate of 1.0L / min, an ambient temperature of 25°C, and a concentrated water pH value of 6.5-6. 7.5, Concentrated water is sodium chloride aqueous solution, under the experimental conditions with a concentration of 1000ppm, the measured water flux is 8...

Embodiment 3

[0030] Configuration mass fraction of 0.5% DOPA and 0.7% nano-SiO2 aqueous solution stirred for 48h, the modified nanoparticles were separated and dried, configuration mass fraction of 2% m-phenylenediamine aqueous solution and adding mass fraction of 0.5% poly Dopamine-modified SiO2, 2% triethylamine hydrochloride, and 0.5% triethylamine are mixed evenly and evenly coated on the diaphragm. After drying in the shade, configure 0.2% trimesoyl chloride (TMC) oil phase solution, evenly coat the diaphragm, and heat-treat in an oven at 120°C for 5 minutes. The high-performance reverse osmosis membrane based on dopamine-modified nanoparticle hybrid prepared by this method was tested at a test pressure of 1.05MPa, a concentrated water flow rate of 1.0L / min, an ambient temperature of 25°C, and a concentrated water pH value of 6.5-6. 7.5, Concentrated water is sodium chloride aqueous solution, under the experimental conditions with a concentration of 1000ppm, the measured water flux is...

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Abstract

The invention aims to provide a preparation method of a hybrid high performance reverse osmosis membrane based on dopamine modified nanoparticles. The method includes: firstly modifying inorganic nanoparticles with dopamine in an alkaline solution, then dispersing the modified nanoparticles evenly in an aqueous phase solution, then preparing a multi-component acyl chloride oil phase solution, andconducting interfacial polymerization to prepare the reverse osmosis membrane. Because of autopolymerization of a dopamine aqueous solution on a solid surface, dopamine can form a polydopamine layer strongly attached to a base membrane. As polydopamine is too dense, dopamine monomers in the aqueous phase can hardly be adsorbed to nanoparticles encapsulated by polydopamine, therefore, in the process of interfacial polymerization, due to the deletion of polyamine monomers, a cavity is formed between the nanoparticles and a matrix, and is just conducive to the passage of water molecules. By optimized selection of the modified nanoparticle components and various membrane preparation conditions and regulation of the post-treatment temperature, the high performance reverse osmosis membrane is prepared.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis composite membranes, and specifically refers to a preparation method of a hybrid high-performance reverse osmosis membrane based on dopamine-modified nanoparticles. [0002] technical background [0003] In the early 1980s, Filmtec launched the fully aromatic polyamide reverse osmosis composite membrane TF.30, which has become the most widely used reverse osmosis membrane due to its excellent chemical stability, high desalination rate and high flux. Since then, reverse osmosis technology has entered a new stage. However, with the wide application of reverse osmosis technology in seawater desalination, waste water recycling, food, semiconductor, electric power, and chemical industry, people put forward higher requirements for reverse osmosis membranes, low energy consumption, high flux, high selectivity, durability High-quality membrane products such as pollution have become the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00C02F1/44
CPCB01D67/0079B01D71/68C02F1/441
Inventor 刘炜
Owner 浙江海纳环保科技有限公司
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