A kind of preparation method of high flux reverse osmosis membrane and obtained high flux reverse osmosis membrane

Abstract

The invention provides a method for preparing a high-flux reverse osmosis membrane, comprising the following steps: Step 1, making a support structure; Step 2, depositing a nano-calcium carbonate layer on the support structure; Step 3, depositing a nano-calcium carbonate layer on the The interfacial polymerization reaction on the support structure forms a reverse osmosis membrane containing a polyamide functional layer. The invention improves the surface roughness of the support layer by in-situ depositing nano-calcium carbonate on the surface of the support structure, which is beneficial to the adsorption of the aqueous phase solution. The growth of the polyamide reduces the depth of the polyamide in the pores of the support structure, reduces the water conduction resistance, and improves the flux of the reverse osmosis membrane. The invention also provides a high-flux reverse osmosis membrane, the water flux of the high-flux reverse osmosis membrane is 79-123LMH, and the desalination rate is 95.74-99.39%.

Description

technical field

[0001] The invention relates to the technical field of reverse osmosis membrane preparation, in particular to a preparation method of a high-flux reverse osmosis membrane and the obtained high-flux reverse osmosis membrane. Background technique

[0002] As one of the most important and effective water purification technologies, reverse osmosis technology has the advantages of high separation efficiency and low cost, and has been widely used in seawater desalination, brackish water desalination, reclaimed water reuse and ultrapure water production and other fields.

[0003] In the application process of reverse osmosis membranes, flux and desalination rate are two parameters to evaluate the core performance of reverse osmosis membranes. The higher the flux, the more purified water and the lower the energy consumption under the same conditions. However, traditional reverse osmosis membrane preparation methods often increase the flux while reducing the desalina...

Examples

Embodiment 1

[0032] A preparation method of a reverse osmosis membrane, the reverse osmosis membrane is a high flux reverse osmosis membrane, specifically comprising the following steps:

[0033]Step 1. Preparation of support structure: prepare 18wt% polysulfone solution, filter to remove undissolved impurities, and after vacuum degassing, use a scraper to evenly coat the polymer solution on the non-woven fabric, and then place it in a pure water coagulation bath at 15°C Transform into a membrane after 1 minute in the middle, and obtain a porous support membrane after washing;

[0034] Step 2, in-situ deposition of nano-calcium carbonate: soak the support structure prepared in step 1 in CaCl with a concentration of 0.1mol / L 2 After a period of time in the aqueous solution (specifically 3min), it was transferred to 0.1mo / L Na 2 CO 3 In the aqueous solution, after washing three times with pure water, the support structure with nano-calcium carbonate deposited in situ was obtained;

[0035...

Embodiment 2

[0042] The difference between embodiment 2 and embodiment 1 is: in the step 2, CaCl 2 and Na 2 CO 3 The concentrations of the aqueous solutions are all 0.05mol / L, and the others remain unchanged.

Embodiment 3

[0043] The difference between embodiment 3 and embodiment 1 is: in the step 2, CaCl 2 and Na 2 CO 3 The concentrations of the aqueous solutions are all 0.6mol / L, and the others remain unchanged.

technical field

[0001] The invention relates to the technical field of reverse osmosis membrane preparation, in particular to a preparation method of a high-flux reverse osmosis membrane and the obtained high-flux reverse osmosis membrane. Background technique

[0002] As one of the most important and effective water purification technologies, reverse osmosis technology has the advantages of high separation efficiency and low cost, and has been widely used in seawater desalination, brackish water desalination, reclaimed water reuse and ultrapure water production and other fields.

[0003] In the application process of reverse osmosis membranes, flux and desalination rate are two parameters to evaluate the core performance of reverse osmosis membranes. The higher the flux, the more purified water and the lower the energy consumption under the same conditions. However, traditional reverse osmosis membrane preparation methods often increase the flux while reducing the desalina...

Examples

Embodiment 1

[0032] A preparation method of a reverse osmosis membrane, the reverse osmosis membrane is a high flux reverse osmosis membrane, specifically comprising the following steps:

[0033]Step 1. Preparation of support structure: prepare 18wt% polysulfone solution, filter to remove undissolved impurities, and after vacuum degassing, use a scraper to evenly coat the polymer solution on the non-woven fabric, and then place it in a pure water coagulation bath at 15°C Transform into a membrane after 1 minute in the middle, and obtain a porous support membrane after washing;

[0034] Step 2, in-situ deposition of nano-calcium carbonate: soak the support structure prepared in step 1 in CaCl with a concentration of 0.1mol / L 2 After a period of time in the aqueous solution (specifically 3min), it was transferred to 0.1mo / L Na 2 CO 3 In the aqueous solution, after washing three times with pure water, the support structure with nano-calcium carbonate deposited in situ was obtained;

[0035...

Embodiment 2

[0042] The difference between embodiment 2 and embodiment 1 is: in the step 2, CaCl 2 and Na 2 CO 3 The concentrations of the aqueous solutions are all 0.05mol / L, and the others remain unchanged.

Embodiment 3

[0043] The difference between embodiment 3 and embodiment 1 is: in the step 2, CaCl 2 and Na 2 CO 3 The concentrations of the aqueous solutions are all 0.6mol / L, and the others remain unchanged.

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