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Preparation method of arginine modified composite nanofiltration membrane

A composite nanofiltration membrane, arginine technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of poor pollution resistance, low flux of composite membrane, poor hydrophilicity of polyamide layer, etc. Achieve the effect of improving membrane fouling, wide application and improving hydrophilicity

Pending Publication Date: 2021-12-07
TIANJIN POLYTECHNIC UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the traditional polypiperazine amide composite nanofiltration membrane has an uneven spine structure due to the rapid reaction of piperazine and trimesoyl chloride, and the cross-linked polyamide layer has poor hydrophilicity. The amount is low, and the pollution resistance is not good

Method used

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  • Preparation method of arginine modified composite nanofiltration membrane
  • Preparation method of arginine modified composite nanofiltration membrane
  • Preparation method of arginine modified composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-12

[0023] The ultrafiltration membrane is fully washed, immersed in an aqueous solution containing 2w% aliphatic amine monomer (the ratio of arginine and piperazine is shown in Table 1) and 3% triethylamine for 10min, and then removes residual moisture on the surface; The ultrafiltration membrane is immersed in the n-hexane solution containing 0.15w / v% trimesoyl chloride monomer and reacted for 1min; then the ultrafiltration membrane is placed in an oven at 60°C for 1min, and then taken out to obtain The polyamide-modified composite nanofiltration membrane was finally soaked in an environment of 25° C. for 48 hours to obtain a composite nanofiltration membrane containing L-arginine. Composite nanofiltration membrane at 0.6MPa, with 1000ppm Na 2 SO 4 The aqueous solution was tested for performance, and its water flux and salt rejection results are listed in Table 1.

[0024] Table 1 The formulation of Examples 1-12 and the water flux and salt rejection of the membrane

[0025] ...

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Abstract

The invention discloses a preparation method of an arginine-containing modified composite nanofiltration membrane with excellent permeability, which comprises the steps of (1) fully cleaning an ultrafiltration membrane, dipping the ultrafiltration membrane in an aqueous solution containing an aliphatic amine monomer for 1-10 minutes, and then removing residual water on the surface; (2) soaking the ultrafiltration membrane treated in the step (1) in an organic phase solution containing 0.1 w / v%-1w / v% of a trimesoyl chloride monomer, and reacting for 0.5-5 minutes; and (3) putting the ultrafiltration membrane treated in the step (2) into a drying oven at the temperature of 30-70 DEG C for 1-10 minutes, then taking out the ultrafiltration membrane to obtain the polyamide modified composite nanofiltration membrane containing L-arginine, and finally soaking the polyamide modified composite nanofiltration membrane in an environment at the temperature of 20-40 DEG C for 12-48 hours to remove unreacted monomers and other impurities.

Description

technical field [0001] The invention relates to the field of nanofiltration membrane preparation, in particular to a preparation method of an arginine-containing modified composite nanofiltration membrane with excellent permeability. Background technique [0002] Nanofiltration membrane is a new type of separation membrane developed after the typical reverse osmosis composite membrane in the early 1980s. Its pore size range is between reverse osmosis membrane and ultrafiltration membrane, about 1nm, so it is called nanofiltration. membrane. It has two notable features: first, the molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, about 200Da to 1000Da; second, the separation layer on the surface of nanofiltration membrane is composed of polyelectrolyte. From the perspective of membrane structure, most nanofiltration membranes are composite membranes, that is, the chemical composition of the surface separation layer of the membrane is ...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00B01D69/02B01D71/56
CPCB01D61/027B01D67/0093B01D67/0088B01D67/0006B01D69/02B01D71/56B01D2325/36B01D2325/14B01D2325/08
Inventor 陈英波马榕娄祎聪黄宸张涛
Owner TIANJIN POLYTECHNIC UNIV
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