Preparation method of fluorion selective nanofiltration membrane

A nanofiltration membrane, fluoride ion technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effect of convenient operation, high selectivity, and high consumption ratio

Active Publication Date: 2013-06-05
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nanofiltration membrane prepared by Seong Uk Hong et al. with sodium polystyrene sulfonate and polyacrylamine hydrochloride has only 73.2% removal rate of fluorine

Method used

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  • Preparation method of fluorion selective nanofiltration membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A polysulfone support membrane made of N, N-dimethylacetamide solution containing 15% polysulfone was put into an aqueous solution of m-phenylenediamine with a mass concentration of 0.5% and a pH value of 8 for 2 minutes; Sodium dodecyl sulfonate at a concentration of 0.05%. The supporting membrane soaked in the m-phenylenediamine solution is rolled with a rubber roller, and the excess solution is removed, and then it is contacted with a solution of trimesoyl chloride with a mass concentration of 0.5% for 20 seconds, and the organic solvent is n-hexane. The film was kept in a vacuum oven at 90° C. for 12 minutes to prepare a polyamide film. The initial performance of the membrane was tested with 500mg / L sodium fluoride aqueous solution under the pressure of 2MPa. The permeability coefficient of the membrane to fluoride ions was 2.139, and the permeability coefficient directly determined the selective permeability of the membrane to fluoride ions. Among them, fluoride io...

Embodiment 2

[0025] Use the polysulfone supporting membrane that contains 15% polysulfone N, N-dimethylacetamide solution to make, put into the aqueous solution of m-phenylenediamine that the mass concentration is 0.2%, pH value is 7 for 3 minutes; Sodium dodecyl sulfonate at a concentration of 0.05%. The supporting membrane soaked in the m-phenylenediamine solution was rolled with a rubber roller to remove the excess solution and then contacted with a solution of trimesoyl chloride with a mass concentration of 0.4% for 30 seconds, and the organic solvent was n-heptane. After the organic solvent was dry, it was contacted with an aqueous solution containing polyethyleneimine with a molecular weight of 600 at a mass concentration of 0.05% for 30 seconds, and the film was placed in an oven at 85°C for 11 minutes. Using 500mg / L sodium fluoride aqueous solution to test the initial performance of the membrane under the pressure of 2MPa, the permeability coefficient of the membrane to fluoride io...

Embodiment 3

[0027] A polysulfone support membrane made of N, N-dimethylacetamide solution containing 18% polysulfone was put into an aqueous solution of m-phenylenediamine with a mass concentration of 0.4% and a pH value of 9 for 1 minute; Sodium dodecyl sulfonate at a concentration of 0.05%. The supporting membrane soaked in the m-phenylenediamine solution was rolled with a rubber roller to remove excess solution and then contacted with a solution containing trimesoyl chloride with a mass concentration of 0.3% for 40 seconds, and the organic solvent was IsoparG. After the organic solvent was dry, it was contacted with an aqueous solution containing polyethyleneimine with a molecular weight of 600 at a mass concentration of 0.1% for 40 seconds, and the film was placed in an oven at 80° C. for 10 minutes. Using 500mg / L sodium fluoride aqueous solution to test the initial performance of the membrane under the pressure of 2MPa, the permeability coefficient of the membrane to fluoride ion is ...

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Abstract

The invention discloses a preparation method of a composite membrane, particularly a preparation method of a fluorion selective nanofiltration membrane. A common base membrane contacts an organic solution containing 1,3,5-benzenetricarbonyl trichloride and a water solution containing polyethyleneimine to obtain the nanofiltration membrane. The nanofiltration membrane has the advantages of high selectivity for fluorions and high consumption ratio; and the preparation method is simple and convenient to operate. The membrane prepared by the method disclosed by the invention has wide applicability in high-fluorine regions.

Description

technical field [0001] The invention relates to a preparation method of a composite membrane, in particular to a preparation method of a fluoride ion selective nanofiltration membrane. technical background [0002] Fluorine is an essential trace element for the human body, but when the fluorine content in drinking water exceeds 4ppm, it will harm the human body and even cause acute poisoning. my country's drinking water standard stipulates that the fluorine content is 1ppm; the sewage discharge standard stipulates that the maximum allowable discharge of fluorine in industrial sewage is 10ppm. At present, more than 70 million people in rural areas of my country drink water with excessive fluorine content. Traditional methods for removing fluoride from water include precipitation, adsorption, and membrane separation. Compared with the former two, the membrane separation method has the advantages of high efficiency and space saving. In terms of membrane separation and defluo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/56B01D71/60B01D67/00C02F1/44C02F1/58
Inventor 周勇戴喆男高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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