Dithiocarbamic acid (DTC) modified chitosan macromolecule composite membrane and preparation method

A polymer and chitosan technology, applied in chemical instruments and methods, water/sludge/sewage treatment, coating, etc., can solve problems such as low mechanical strength, and achieve easy regeneration, simple operation, and good results

Inactive Publication Date: 2012-09-19
JIANGNAN UNIV
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Problems solved by technology

Therefore, the chelating ability of DTC modified chitosan (DTC chitosan) to heavy metal ions will be greatly enhanced, and the scope of applicable heavy metal ions will also be greatly expanded, so making it DTC modified chitosan membrane will have The functionality of removing heavy metal ions is very good, but the chitosan membrane has the defect of low mechanical strength, and at present, many commercial polymer membrane materials, such as: polysulfone membrane, polyethersulfone membrane, polyvinylidene fluoride Membranes, polypropylene membranes, polytetrafluoroethylene membranes, etc., all have good chemical, physical, thermal stability and high mechanical strength, and can be used as supporting membranes for chitosan membranes. Combining the two can make up for Due to the defect of insufficient mechanical strength of chitosan film, DTC modification of this composite film can simultaneously have the excellent performance of chelating heavy metal ions of DTC chitosan

Method used

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  • Dithiocarbamic acid (DTC) modified chitosan macromolecule composite membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: DTC chitosan / polyethersulfone composite membrane

[0017] 2.5 g of chitosan with a deacetylation degree of 90% was dissolved in 1 wt % acetic acid solution to obtain a 1 wt % chitosan acetic acid aqueous solution. Filter to remove insoluble impurities, stand to remove air bubbles, mix with 0.12wt% glutaraldehyde aqueous solution at a mass ratio of 5:1, and evenly coat the outer surface of the polyethersulfone membrane with an average coating thickness of 0.1 μm at 60°C The film was cured for 1 h, and finally rinsed with deionized water to remove residual glutaraldehyde. Then the membrane was immersed in 0.2mol / L KHCO 3 -K 2 CO 3 (pH10) solution, slowly add 25g of carbon disulfide dropwise, stir gently at 20°C for 15h, then rinse with deionized water, ethanol, diethyl ether, the obtained membrane product is at P 2 o 5 Dry under vacuum at room temperature.

[0018] Take 1 g of the obtained membrane and soak it directly in a water sample containing heav...

Embodiment 2

[0019] Embodiment 2: DTC chitosan / polypropylene composite film

[0020] 5 g of chitosan with a deacetylation degree of 95% was dissolved in 2 wt % acetic acid aqueous solution to obtain a 2 wt % chitosan acetic acid solution. Filter to remove insoluble impurities, let it stand to remove air bubbles, mix with 2wt% glutaraldehyde aqueous solution in a mass ratio of 2:1, and evenly coat it on the polypropylene base film, with an average coating thickness of 0.2 μm, and cure at 70°C Membrane 3h, make chitosan cross-linking reaction. Then the membrane was immersed in 0.2mol / L KHCO 3 -K 2 CO 3 (pH10) solution, slowly add 20g of carbon disulfide dropwise, stir gently at 40°C for 5h, then rinse with deionized water, ethanol, diethyl ether, the obtained membrane product is at P 2 o 5 Dry under vacuum at room temperature.

[0021] Take 1 g of the obtained membrane and soak it directly in a water sample containing heavy metal ions with a concentration of 1 mmol / L for adsorption. Ad...

Embodiment 3

[0022] Embodiment 3: DTC chitosan / polysulfone composite membrane

[0023] 5 g of chitosan with a deacetylation degree of 98% was dissolved in 5 wt % acetic acid aqueous solution to obtain a 10 wt % chitosan acetic acid solution. Filter to remove insoluble impurities, stand to remove air bubbles, mix with 0.15wt% glutaraldehyde solution at a mass ratio of 1:1, and evenly coat the outer surface of the polysulfone membrane with an average coating thickness of 0.25 μm, at 90°C The film was cured for 4 h, and finally rinsed with deionized water to remove residual glutaraldehyde. Then the membrane was immersed in 0.2mol / L KHCO 3 -K 2 CO 3 (pH10) solution, slowly add 25g of carbon disulfide dropwise, stir gently at 30°C for 10h, then wash with deionized water, ethanol, diethyl ether, the resulting membrane product is at P 2 o 5 Dry under vacuum at room temperature.

[0024] Take 1 g of the obtained membrane and soak it directly in a water sample containing heavy metal ions with...

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Abstract

The invention relates to a chitosan macromolecule composite membrane and a preparation method, in particular to a preparation method of a dithiocarbamic acid (DTC) modified chitosan macromolecule composite membrane. The composite membrane is used for efficiently removing heavy metal ions in industrial waste water. The preparation method concretely comprises the following steps of (1) chitosan acetic acid solution is prepared: chitosan with the deacetylation degree greater than 90 percent is dissolved into acetic acid water solution with the mass concentration being 1 to 5 weight percent, solid impurities in the solution are removed after still standing, and chitosan acetic acid solution with the mass concentration being 1 to 10 weight percent is obtained; (2) crosslinking agent solution is prepared: glutaraldehyde is adopted as the crosslinking agents, and the mass concentration range of glutaraldehyde water solution is 0.2 to 2 weight percent; (3) the chitosan acetic acid solution and the crosslinking agent solution are mixed according to a mass ratio being (5-1):1 and are coated on a macromolecule support membrane, and the coating thickness is in a range being 0.1 to 0.25 mum so that the cross-linking reaction is generated; (4) prepared semi-finished product membranes take reaction with carbon disulfide, the mass ratio of the added carbon disulfide to chitosan is (10-4):1, DTC is grafted on the surface, then, the drying is carried out, and the DTC modified chitosan macromolecule composite membrane is prepared. The DTC modified chitosan macromolecule composite membrane and the preparation method have the beneficial effects that the DTC modified chitosan macromolecule composite membrane combines the advantages of mechanical strength and stability of the macromolecule support membrane, meanwhile, the excellent chelating heavy metal ion performance of the DTC chitosan is realized, the treatment effect on heavy metal ion waste water is good, the membrane is directly soaked in waste water containing the heavy metal ions to realize the absorption treatment, the operation is simple, the effect is excellent, in addition, the regeneration is easy, the repeated use can be realized, and the cost is greatly reduced.

Description

technical field [0001] The invention relates to a chitosan polymer composite membrane and a preparation method thereof, in particular to a preparation method of a DTC modified chitosan polymer composite membrane, and the composite membrane can be used for efficiently removing heavy metal ions in industrial wastewater. The invention relates to the technical fields of membrane preparation and environmental protection, and particularly belongs to the field of wastewater treatment containing heavy metal ions. Background technique [0002] Chitosan contains amino and hydroxyl groups in its structure, which has a strong chelating effect on heavy metal ions, and is non-toxic and biodegradable. It is an ideal heavy metal adsorbent, but its adsorption capacity and scope of application are limited. . Dithiocarbamate (DTC) groups can combine with most heavy metal ions to form water-insoluble chelates. Therefore, the chelating ability of DTC modified chitosan (DTC chitosan) to heavy m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J7/04C08J3/24C08L5/08C08L81/06C08L27/16C08L23/12C08L27/18C02F1/28C02F1/62
Inventor 顾文秀吴婷婷李磊邹路易李佩倩张文艳
Owner JIANGNAN UNIV
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