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Nanofiltration membrane for selectively separating trace organic substances and calcium-magnesium ions, and preparation method thereof

A technology of calcium and magnesium ions and organic matter, applied in the field of nanofiltration membrane and its preparation, can solve the problems of poor chemical stability, unfavorable health of drinking water, increased operation energy consumption and membrane pollution control cost, etc. The effect of maintaining chemical stability and health

Active Publication Date: 2018-12-21
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanofiltration water Ca 2+ If the concentration is too low, the chemical stability of water will become poor, and the corrosion will become stronger. At the same time, Ca 2+ / Mg 2+ and total dissolved solids are too low, which is not conducive to drinking water health
In order to maintain the chemical stability and health of nanofiltration water, water quality adjustment is required, which increases investment and operating costs
In addition, the effect of nanofiltration on Ca 2+ The efficient interception will also aggravate its insoluble salts such as CaCO 3 Fouling on the surface of the membrane, thus increasing the operating energy consumption and the control cost of membrane fouling
However, looser nanofiltration membranes such as Sepro NF6 membrane and NTR7450 membrane have a low rejection rate for inorganic salt ions, but their molecular weight cut-off is usually above 500Da, which cannot effectively remove most trace organic substances.

Method used

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  • Nanofiltration membrane for selectively separating trace organic substances and calcium-magnesium ions, and preparation method thereof
  • Nanofiltration membrane for selectively separating trace organic substances and calcium-magnesium ions, and preparation method thereof
  • Nanofiltration membrane for selectively separating trace organic substances and calcium-magnesium ions, and preparation method thereof

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preparation example Construction

[0029] An embodiment of the present invention provides a preparation method for selectively separating trace organic matter and calcium and magnesium ion nanofiltration membranes, comprising the following steps:

[0030] S1, place the porous support layer in the first solution containing polyamine monomer and acidic organic monomer and take it out after infiltration. In the first solution, the total mass of the polyamine monomer and the acidic organic monomer The concentration is 0.4%-1%, and the mass of the acidic organic monomer is 35%-65% of the total mass of the polyamine monomer and the acidic organic monomer;

[0031] S2, immersing the porous support layer attached with the first solution in the second solution formed by dissolving the acid chloride monomer in an organic solvent to carry out interfacial polymerization reaction, in the second solution, the mass of the acid chloride monomer at a concentration of 0.1%-0.2%; and

[0032] S3, performing heat treatment on the...

Embodiment 1

[0048] S1. Soak the polysulfone porous support layer in a mixed aqueous solution with a mass concentration of piperazine (PIP) and 3,5-diaminobenzoic acid (BA) of 0.375% for 2 minutes, take out the porous support layer, and discharge excess solution;

[0049] S2, placing the porous support layer in a n-hexane solution with a mass concentration of trimesoyl chloride (TMC) of 0.15% and reacting for 1 minute;

[0050] S3, heat-treating the composite membrane obtained by the reaction at 60° C. for 5 minutes to prepare a nanofiltration membrane.

Embodiment 2

[0052] The preparation method is basically the same as that of Example 1, except that the mass concentrations of piperazine (PIP) and 3,5-diaminobenzoic acid (BA) in step S1 are both 0.3%.

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Abstract

The invention provides a nanofiltration membrane for selectively separating trace organic substances and calcium-magnesium ions. The nanofiltration membrane comprises a porous support layer and a filter skin layer, a first solution and a second solution are subjected to interfacial polymerization reaction and heating treatment in sequence to form the filter skin layer, the first solution is a water solution containing polyamine monomers and acid organic matter monomers, and the second solution is formed by dissolving acyl chloride monomers in an organic solvent; in the first solution, the total mass concentration of the polyamine monomers and the acid organic matter monomers is 0.4-1%, and the acid organic matter monomers account for 35-65%; in the second solution, the mass concentration of the acyl chloride monomers is 0.1-0.2%. The invention further provides a preparation method of the nanofiltration membrane for selectively separating the trace organic substances and the calcium-magnesium ions. The nanofiltration membrane has high rejection rate for the trace organic substances but low rejection rate for the calcium-magnesium ions, and chemical stability and health of nanofiltration water are maintained while the trace organic substances are effectively removed.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane and its preparation, in particular to a nanofiltration membrane for selectively separating trace organic matter and calcium and magnesium ions and a preparation method thereof. Background technique [0002] As trace organic substances such as pesticides, pharmaceuticals, personal care products, and endocrine disruptors have been detected in water environments around the world, trace organic pollution has become an emerging environmental problem. Nanofiltration and reverse osmosis technologies are considered to be highly reliable and stable methods for removing trace organic matter, and have broad application prospects in water treatment and other fields. The molecular weight cut-off of nanofiltration membrane is in the range of 200-1000Da. Selecting a suitable molecular weight cut-off nanofiltration membrane can effectively remove most trace organic substances. [0003] At present...

Claims

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Application Information

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IPC IPC(8): B01D61/00C02F1/44C02F101/30
CPCB01D61/027C02F1/442C02F2101/30
Inventor 王小刘彦伶解跃峰
Owner TSINGHUA UNIV
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