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Method for preparing polypropylene ion chelating membrane by radiation grafting method

A technology of radiation grafting and polypropylene membranes, which is applied in the field of ion chelation membrane preparation, can solve the problems of low purity of polypropylene grafts, low grafting rate, limited introduction of functional groups, etc., and achieve excellent chelation The effect of adsorption performance, large chelating capacity and good mechanical properties

Inactive Publication Date: 2009-09-02
SHANGHAI UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The polypropylene graft prepared by this method has low purity and low grafting rate, thus limiting the introduction of functional groups

Method used

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  • Method for preparing polypropylene ion chelating membrane by radiation grafting method
  • Method for preparing polypropylene ion chelating membrane by radiation grafting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment one: the concrete steps of this embodiment are:

[0015] (1) at first preparation volume ratio is the N, N-dimethylformamide solution of the acrylonitrile of 20% as grafting reaction system;

[0016] (2) Then scrub the PP film with acetone and dry it to a constant weight. Put the weighed PP film into a polyethylene film bag, and fill the bag with high-purity nitrogen to drive away the air. After sealing, Place in an electron irradiation room for irradiation; the electron beam intensity is 1mA, and the total irradiation dose is 150kGy;

[0017] (3) In the third step, place the irradiated PP film in a graft tube filled with N,N-dimethylformamide solution of AN, vacuumize and fill with nitrogen to seal, and then place the graft tube at 50°C In a constant temperature water-soluble tank, react for 0.5 hours, take the grafted membrane out of the grafted tube, wash it with N, N-dimethylformamide, and then soak it for 12 hours to remove the homopolymer on the surfac...

Embodiment 2

[0019] Embodiment two: the concrete steps of this embodiment are:

[0020] (1) at first preparation volume ratio is the acrylonitrile N of 60%, N-dimethylformamide solution as grafting reaction system;

[0021] (2) Then scrub the PP film with acetone and dry it to a constant weight. Put the weighed PP film into a polyethylene film bag, and fill the bag with high-purity nitrogen to drive away the air. After sealing, Placed in an electron irradiation room for irradiation; the electron beam current intensity is 1mA, and the total irradiation dose is 300kGy;

[0022] (3) In the third step, place the irradiated PP film in a graft tube filled with N,N-dimethylformamide solution of AN, vacuumize and fill with nitrogen to seal, and then place the graft tube at 50°C In a constant temperature water-soluble tank, react for 2 hours, take the grafted membrane out of the grafted tube, wash it with N,N-dimethylformamide, and then soak it for 12 hours to remove the homopolymer on the surface...

Embodiment 3

[0024] Embodiment three: adopt the chelating film sample 1 that above-mentioned embodiment makes and 2 to heavy metal ion V respectively 5+ Carry out chelation adsorption, and measure its equilibrium adsorption capacity and adsorption rate. The specific method is: take the chelating membrane, cut it into small pieces, weigh it accurately, put 0.1 grams in each equal portion into conical flasks, and then add V 5+ Metal ion solution (volume is 25mL), shakes 10 hours on the shaker, takes out chelating membrane, then measures the concentration of residual metal ion in the solution with inductively coupled plasma emission spectrometer, thereby calculates the chelating membrane that this invention makes The saturated adsorption capacity and adsorption efficiency of metal ions. The results are shown in Table 1.

[0025] Table 1 Equilibrium adsorption capacity and adsorption rate of metal ions by chelating membrane

[0026]

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Abstract

The invention relates to a method for preparing a polypropylene ion chelating membrane by adopting an electron beam radiation grafting method. The method comprises the following steps: using a polypropylene membrane (PP) as a skeleton; grafting nontoxic acrylonitrile (AN) on the membrane by adopting a method of pre-radiation grafting initiated by an electron beam; and preparing a chelating functional membrane containing imidogen through an amination reaction. The method has the characteristics of simple synthesizing steps, low price and easily-obtained raw materials, and the like. Besides, the ion chelating functional membrane synthesized by the method has the advantages of better chemical and mechanical stability, good coordinating and complexing abilities to metal ions, large adsorption capacity, easy regeneration and reusability, and can be applied to purifying industrial wastewater polluted by heavy metal ions or enriching noble metal ions.

Description

technical field [0001] The invention relates to a method for preparing an ion chelating membrane, in particular to a method for preparing a polypropylene ion chelating membrane by electron beam radiation grafting. technical background [0002] Vanadium compounds can cause chlorosis of plants and prevent their growth, and can slow down the recovery process of diabetics. In addition, waste water containing vanadium compounds is one of the main problems of water pollution. Therefore, the enrichment and removal of vanadium compounds is particularly urgent. [0003] The active group of the chelating membrane contains atoms such as N, O, S, and P that have not formed a lone pair of electrons. These atoms can form a coordination bond with a metal ion with a lone pair of electrons. The ion exchange membrane has more special functional groups and more specific selectivity, which makes it have stronger binding force with metal ions and higher selectivity. [0004] The commonly used ...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J7/16C08J7/12C08F255/02C08L23/12
Inventor 俎建华何世强严峰
Owner SHANGHAI UNIV
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