Polyamide composite reverse osmosis membrane containing nano materials

Abstract

The invention provides a polyamide composite reverse osmosis membrane containing nano materials. The polysulfone solution of the membrane is prepared from the following raw materials by weight: 15-30 parts of polysulfone, 45-75 parts of organic solvents, 0.5-40 parts of organic pore-forming agents and 0-30 parts of nano inorganic materials. The method of membrane preparation by phase inversion is adopted on the polysulfone porous layer and in the preparation process, the polysulfone is taken as the polymer matrix and the organic pore-forming agents and the nano inorganic materials are added after the organic solvents are added. Addition of the organic pore-forming agents can increase the void ratio of the membrane, thus greatly improving the water flux of the membrane. Addition of the nano inorganic materials reduces the defect rate of the formed membrane, ensures the formed polyamide layer to be denser in the subsequent interfacial polymerization procedure, greatly improves the desalination rate of the membrane, ensures the mechanical strength of the membrane to be compensated and improves the compaction resistance of the reverse osmosis membrane under the condition of ensuring the desalination rate and the water flux, thus prolonging the service life of the membrane.

Description

technical field [0001] The invention relates to a composite reverse osmosis membrane, in particular to a polyamide composite reverse osmosis membrane containing nanomaterials. Background technique [0002] Membrane science and technology is a multidisciplinary emerging technology. In recent years, on the basis of the development and interpenetration of various disciplines, membrane science and technology has developed rapidly, and has become a new growth point for the development of chemistry and chemical engineering disciplines, and is also the focus of contemporary high-tech development. Membrane separation technology refers to the method of separating, grading, purifying and enriching two-component or multi-component solutes or solvents with artificially synthesized or natural membranes, driven by external energy or chemical potential difference. Microfiltration, ultrafiltration, nanofiltration and reverse osmosis. As a modern new high-efficiency separation technology, ...

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Problems solved by technology

[0003] At present, the most commonly used reverse osmosis membrane in industry is polyamide composite membrane. Polyamide membrane has high desalination rate, large flux, excellent chemical stability, wide pH range (4-11), biocorrosion resistance, and low operating pressure requirements. Advantages, but not resistant to oxidation, poor anti-pollution ability, poor chlorine resistance, resulting in short service life of the membrane

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