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Preparation method of nano silver/poly dopamine composite membrane

A polydopamine, composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of high water flux, good antibacterial properties, and high dye separation performance

Inactive Publication Date: 2015-11-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To the best of our knowledge, no studies have applied polydopamine as a multifunctional layer to construct nanosilver composite films.

Method used

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  • Preparation method of nano silver/poly dopamine composite membrane
  • Preparation method of nano silver/poly dopamine composite membrane
  • Preparation method of nano silver/poly dopamine composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Step 1. Preparation of polyethersulfone base membrane: dissolving polyethersulfone in N,N-dimethylformamide to prepare a casting solution containing polyethersulfone with a mass concentration of 16%, stirring at 60° C. for 4 hours, And stand at 60°C for defoaming for 4 hours, after cooling to room temperature, pour the casting solution on the glass plate to scrape the film, then put it in a water bath at 25°C to solidify to form a film, take it off the glass plate and soak it in deionized water After 24 hours, a polyethersulfone-based membrane was obtained.

[0015] Step 2. Preparation of nano-silver / polydopamine composite membrane: Tris-HCl buffer solution with pH=8.5 is used to dissolve dopamine, and the prepared polyethersulfone ultrafiltration membrane is soaked in 0.2% dopamine buffer solution by mass percentage Shake continuously for 4 hours, so that polydopamine can be fully deposited on the surface of the membrane, take out the membrane and simply rinse it with ...

Embodiment 2

[0018] Step 1, the preparation of the polyethersulfone base membrane is the same as in Example 1.

[0019] Step 2. Preparation of nano-silver / polydopamine composite membrane: basically the same as in Example 1, the only difference being that the time of airtight reaction at room temperature was increased from 2h to 12h, and nano-silver / polydopamine composite membrane 2 was finally obtained.

[0020] The water flux of the composite membrane 2 that present embodiment 2 makes is 402.50L / (m 2 hMPa). The rejection rate of sodium orange yellow (Mw=452.4Da, mass percentage 0.01%) aqueous solution is 61.41%. Figure 4 It is the composite film 2 plate coating antibacterial experiment and the effect diagram of the inhibition zone experiment of the composite film 2 prepared in this embodiment 2.

Embodiment 3

[0022] Step 1, the preparation of the polyethersulfone base membrane is the same as in Example 1.

[0023] Step 2. Preparation of nano-silver / polydopamine composite film: basically the same as in Example 1, the only difference being that the time of airtight reaction at room temperature was increased from 2h to 36h, and nano-silver / polydopamine composite film 3 was finally obtained.

[0024] The water flux of the composite membrane 3 that present embodiment 3 makes is 282.85L / (m 2 hMPa). The rejection rate of sodium orange yellow (Mw=452.4Da, mass percentage 0.01%) aqueous solution is 71.65%.

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Abstract

The invention discloses a preparation method of a nano silver / poly dopamine composite membrane. The preparation method comprises following steps: phase inversion is adopted so as to prepare a polyether sulfone (PES) ultrafiltration basement membrane; the PES ultrafiltration basement membrane is immersed in a dopamine solution, and an ultrathin active layer is formed via deposition of poly dopamine onto the surface of the PES ultrafiltration basement membrane; in-suit introduction of nano silver onto the membrane surface is realized via silver nitrate postprocessing, and the nano silver / poly dopamine composite membrane is prepared. Advantages of the preparation method are that: compared with the preparation method of conventional nano silver composite membranes, poly dopamine is taken as a multifunctional unit, and construction of a separation layer, mineralization, and immobilization of nano silver are realized. The preparation method is green, simple, convenient, and controllable; the separation layer is obtained via water phase construction, and no organic solvent is needed; in-suit synthesis of nano silver is realized, and no chemical reductant or photo-initiation is needed. The nano silver / poly dopamine composite membrane possesses relatively high water flux, and excellent dye separation performance and antibacterial properties.

Description

technical field [0001] The invention relates to a preparation method of a nano-silver / polydopamine composite membrane, belonging to the technical field of composite membrane preparation. Background technique [0002] Nanofiltration technology is a pressure-driven membrane separation technology whose separation accuracy is between reverse osmosis and ultrafiltration. The pore size of nanofiltration membrane is 0.5-2nm, its operating pressure is usually 0.3-1.0MPa, and the molecular weight cut-off is 200- 1000 range. Compared with reverse osmosis, nanofiltration membranes have higher water flux at lower operating pressures and higher rejection rates for divalent ions and small organic molecules. Nanofiltration membranes are widely used in the desalination of brackish water, printing and dyeing wastewater treatment, biochemical preparations and pharmaceutical purification and other fields. [0003] Biological fouling widely exists in many membrane processes and has become an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D67/00B01D71/68B01D71/60B01D71/02
Inventor 姜忠义张润楠苏延磊刘亚楠周林杰周田田
Owner TIANJIN UNIV
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