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A modified reverse osmosis membrane prepared by a core-shell nanoparticle with hierarchical porous structure

A nanoparticle and reverse osmosis membrane technology, applied in the field of membrane separation, can solve the problem of low mass transfer coefficient, achieve the effect of improving structural stability and increasing compatibility

Active Publication Date: 2020-06-19
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core-shell type multi-level pore structure nano-particles of the present invention break through the limitations of small pore size and low mass transfer coefficient of zeolite molecular sieves, overcome the problem of blocked pores caused by polymerization reaction due to too large pore size of mesopores, and the surface of graphene oxide has Abundant functional groups, can carry out a variety of chemical modifications, which is conducive to improving the compatibility of nanomaterials and polyamide materials

Method used

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  • A modified reverse osmosis membrane prepared by a core-shell nanoparticle with hierarchical porous structure
  • A modified reverse osmosis membrane prepared by a core-shell nanoparticle with hierarchical porous structure
  • A modified reverse osmosis membrane prepared by a core-shell nanoparticle with hierarchical porous structure

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Embodiment 1-4

[0030] The invention provides a preparation method of core-shell type hierarchical porous structure nanoparticles. Under room temperature and strong stirring conditions, the graphene oxide aqueous solution is added dropwise to the water dispersion of mesoporous silica, and the stirring is continued. 1-2 hours, then heat treatment for 2-3 hours, and finally centrifuged and washed with ultrapure water to obtain a core-shell structure nanoparticle dispersion.

[0031] Strong stirring can promote the rapid dispersion of graphene oxide, while avoiding uneven coating of graphene oxide on the surface of mesoporous silica particles. Drop-by-drop addition can avoid too high concentration of local graphene oxide, thereby avoiding the disorder of its assembly on the surface of mesoporous silica particles.

[0032] Preferably, the concentration of the graphene oxide aqueous solution is 0.1-0.5 mg / mL, the concentration of the aqueous dispersion of mesoporous silica is 0.01-0.05 mg / mL; the ...

Embodiment 5-8

[0041] The present invention also provides a method for preparing a modified reverse osmosis membrane prepared from nanoparticles with a core-shell type hierarchical porous structure, comprising the following steps:

[0042] (1) configuring the core-shell type hierarchical porous structure nanoparticles into water phase and oil phase solutions respectively;

[0043] (2) Dry the polysulfone ultrafiltration membrane to a moisture content of 40-60%, then dip-coat the water phase solution on one side for 30-50s, and dry it to a moisture content of 60-80%, then continue to dip-coat the oil phase on the same side Solution, react for 55-65 seconds to make a composite membrane; one side is dipped in the water phase and then reacted with the oil phase, on the one hand, it can save raw materials, on the other hand, it can reduce the post-treatment steps of the reverse osmosis membrane;

[0044] (3) heat-treat the composite film at 40-50°C for 1-2 minutes, squeeze it with rubber rollers,...

Embodiment 9

[0054] Preparation of a modified reverse osmosis membrane prepared by core-shell type hierarchical porous nano-particles: Disperse mesoporous silica in ultrapure water and disperse with ultrasonic wave for 60 minutes to obtain a uniform dispersion with a concentration of 0.02mg / mL; disperse graphene oxide in ultrapure water, disperse and crush it with ultrasonic assistance for 3 hours, centrifuge and take the supernatant to obtain a graphene oxide solution with a concentration of 0.1mg / mL; at room temperature and under strong stirring conditions , the graphene oxide solution was added dropwise to the mesoporous silica dispersion, stirred continuously for 1 hour, then heated to 100°C for heat treatment for 3 hours, and finally centrifuged and washed. Configure the core-shell structure nanoparticles into a 0.03 mg / mL aqueous solution, add m-phenylenediamine to make the concentration respectively 2.35 (w / v)%; configure 0.99 (w / v)% trimesoyl chloride n-hexane solution; Dry the ult...

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Abstract

The invention relates to a core-shell hierarchical porous structure nanoparticle and a modified reverse osmosis membrane prepared from the same, specifically to a graphene oxide coated mesoporous silica nanoparticle with a core-shell hierarchical porous structure and a preparation method thereof, and the modified reverse osmosis membrane prepared by using the particle as a material. The modified reverse osmosis membrane is prepared by modifying the surface of a polysulfone ultrafiltration membrane with the core-shell hierarchical porous structure nanoparticle and a reverse osmosis membrane; and the reverse osmosis membrane is prepared through an interfacial polymerization reaction between m-phenylenediamine and trimesoyl chloride on the surface of an ultrafiltration membrane. The core-shell hierarchical porous structure nanoparticle provided by the invention breaks the limitations of small pore size and low mass transfer coefficient of a zeolite molecular sieve, and overcomes the disadvantage of pore blockage in a polymerization reaction due to excessively large size of a mesopore; meanwhile, the surface of graphene oxide has rich functional groups, can realize a plurality of chemical modifications, and facilitates improving of the compatibility of a nanometer material and a polyamide material. Thus, a novel design idea is provided for development of high-performance reverse osmosis membranes.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a core-shell type nanoparticle with hierarchical porous structure and a modified reverse osmosis membrane prepared therefrom. Background technique [0002] Water is an indispensable basic substance for human survival and production. It is one of the controlling elements of the ecological environment and a strategic economic resource. The scarcity of water resources is increasingly affecting the global economic development and ecological environment. Relevant agencies of the United Nations pointed out that water shortage will seriously restrict economic and social development, and may lead to regional or inter-state conflicts. Although the world's total water reserves are as high as 1.386 billion cubic kilometers, the available freshwater resources only account for about 0.3%. Seawater desalination, as a freshwater resource increment technology, has become a strategic c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/58B01D71/02B01D69/12B01D67/00B01D61/02
CPCB01D61/025B01D67/0079B01D69/125B01D71/021B01D71/027B01D71/58B01D71/68
Inventor 王剑田欣霞曹震李晓明郭春刚张慧峰张雨山
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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