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Biological pollution-resistant reverse osmosis membrane and preparation method thereof

An anti-biological pollution, reverse osmosis membrane technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of anti-biological pollution, unfriendly human body and environment, toxicity, etc., to achieve growth inhibition, raw material Convenient source and good antibacterial effect

Active Publication Date: 2017-05-17
恩泰环保科技(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an anti-biological fouling reverse osmosis membrane for the existing problems of adding antimicrobial agents to the reverse osmosis membrane, which have certain toxicity, are unfriendly to the human body and the environment, etc.

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  • Biological pollution-resistant reverse osmosis membrane and preparation method thereof
  • Biological pollution-resistant reverse osmosis membrane and preparation method thereof

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preparation example Construction

[0031] Such as figure 1 Shown, in a specific embodiment, the preparation method of the anti-biological fouling reverse osmosis membrane at least comprises the following steps:

[0032] Step S01. Using ferulic acid to graft natural lignin;

[0033] Step S02. Prepare a solution of lignin grafted with ferulic acid and a crosslinking agent, and apply it on the surface of the polysulfone membrane support membrane layer, and then dry it to form an anti-pollution membrane layer;

[0034] Step S03. Apply m-phenylenediamine solution and trimesoyl chloride solution to the surface of the anti-pollution film successively, react and dry to obtain a dense film, and rinse and dry to obtain the anti-biological pollution anti-pollution film. permeable membrane.

[0035] Wherein, before the step of grafting lignin with ferulic acid, a lignin extraction step may also be included.

[0036] In a preferred embodiment, the extraction method of lignin is as follows:

[0037] 1) Mix the dried crop...

Embodiment 1

[0063] (1) Extraction of lignin:

[0064] After pulverizing the sorghum stalks, drying them at 60°C for 24 hours;

[0065] The dried sorghum stalk powder was mixed with 2M sodium hydroxide solution at a mass ratio of 1:10, and heated in an oven at 60°C for 12 hours; the heated mixture was separated by a centrifuge at a speed of 5000 rpm for 15 minutes, Take the supernatant;

[0066] Use 5M sulfuric acid to adjust the pH value of the supernatant to 4.0, place it in an environment of 4°C for 12 hours, separate it with a centrifuge at a speed of 5000 rpm for 15 minutes, and collect the precipitated lignin;

[0067] After the collected lignin was dried, it was dissolved in 0.5M sodium hydroxide solution, so that the mass fraction of lignin in the solution was 1%.

[0068] (2) Grafting treatment of ferulic acid:

[0069] Use 2M hydrochloric acid to adjust the sodium hydroxide solution containing 1wt% lignin in step (1) to make pH=6.0, and then mix it with 105mM potassium phospha...

Embodiment 2

[0078] (1) Extraction of lignin:

[0079] After pulverizing the sorghum stalks, drying them at 60°C for 24 hours;

[0080] Mix the dried sorghum stalk powder with 2M sodium hydroxide solution at a mass ratio of 1:10, and heat in an oven at 60°C for 12 hours; the heated mixture is passed through a centrifuge at 5000 rpm Separation at rotational speed for 15 minutes, take the supernatant;

[0081] Use 5M sulfuric acid to adjust the pH value of the supernatant to 4.0, place it in an environment of 4°C for 12 hours, separate it with a centrifuge at a speed of 5000 rpm for 15 minutes, and collect the precipitated lignin;

[0082] After the collected lignin was dried, it was dissolved in deionized water so that the mass fraction of lignin in the solution was 1%, heated to 60°C, and stored in an environment of 60°C.

[0083] (2) Coating treatment of lignin:

[0084] Using glyoxal as the solute, the glyoxal was dissolved in deionized water to prepare a 10 wt% crosslinking agent sol...

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Abstract

The invention relates to the technical field of a reverse osmosis membrane, and in particular relates to a biological pollution-resistant reverse osmosis membrane and a preparation method thereof. The biological pollution-resistant reverse osmosis membrane comprises a supporting membrane layer, and an anti-pollution membrane layer and a compact membrane layer which are successively combined outwards from one surface of the supporting membrane layer; and the anti-pollution membrane layer is formed by lignin grafted by ferulic acid. The biological pollution-resistant reverse osmosis membrane can effectively inhibit the growth of microorganisms on the surface of the membrane, the biological pollution resistance of the membrane is improved, and the reverse osmosis membrane has no adverse influence on the health of the human body and the environment while still keeping high water flux and high desalting rate and can be widely applied to the field of water treatment.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membranes, in particular to an anti-biological fouling reverse osmosis membrane and a preparation method thereof. Background technique [0002] With the rapid development of society, the total fresh water content of the earth can no longer meet the needs of people's lives. Seawater desalination and water purification have alleviated people's demand for fresh water resources to a certain extent. Among them, whether it is seawater desalination or water purification industry, reverse osmosis membrane has become the most commonly used membrane today. [0003] However, during the use of the reverse osmosis membrane, the surface of the reverse osmosis membrane is subject to biological contamination due to the attachment and reproduction of microorganisms such as bacteria, which leads to a decrease in the permeability of the reverse osmosis membrane. Biological fouling has become one of the main...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D69/12B01D71/56B01D71/68B01D71/78B01D67/00B01D61/02
CPCB01D61/025B01D69/02B01D69/125B01D71/56B01D71/68B01D71/78B01D2323/38B01D2325/48
Inventor 王冀张晓民罗教明杨佳富吴术球陈剑
Owner 恩泰环保科技(常州)有限公司
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