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Preparation method of metal ion selective separation composite membrane

A metal ion and composite membrane technology, applied in the field of membrane separation, can solve the problems of poor mechanical properties of a single chitosan film and cannot meet the application requirements in the field of membrane separation technology, and achieve the effect of good mechanical properties and uniform texture

Active Publication Date: 2014-05-14
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although chitosan has good film-forming properties, the mechanical properties of a single chitosan film are poor, which cannot meet the application requirements in the field of membrane separation technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A CTS with selective separation of metal cadmium ions (Cd 2+ ) / PVDF composite film, with chitosan (CTS), polyvinylidene fluoride (PVDF), cadmium chloride (CdCl 2 2 / 5H 2 (2) is raw material, is synthesized by operations such as sol-gel, templating, and its preparation method comprises the steps:

[0023] 1) Dissolve 1.3g cadmium chloride and 2.4g chitosan in 200ml 4% acetic acid aqueous solution, stir evenly and swell for 24h to obtain solution a; dissolve 0.8g polyvinylidene fluoride powder in 80ml dimethylacetamide , stir evenly to obtain solution b;

[0024] 2) Mix solution a obtained in 1) with solution b, stir and swell to obtain solution c;

[0025] 3) Spread the solution c obtained in 2) on a 10cm×10cm non-woven fabric, and place it in a blast drying oven at 40°C for 2 hours;

[0026] 4) arrange the non-woven fabric dried in 3) in a 2% sodium hydroxide solution, separate from the non-woven fabric to obtain a uniform and transparent film d;

[0027] 5) Wash th...

Embodiment 2

[0030] A CTS (Ni 2+ ) / PVDF composite film, with chitosan (CTS), polyvinylidene fluoride (PVDF), nickel sulfate (NiSO 4 ·6H 2 (2) is raw material, is synthesized by operations such as sol-gel, templating, and its preparation method comprises the steps:

[0031] 1) Dissolve 1.86g of nickel sulfate and 2.4g of chitosan in 200ml of 4% aqueous acetic acid solution, stir evenly and swell for 24 hours to obtain solution a; dissolve 1.5g of polyvinylidene fluoride powder in 80ml of dimethylacetamide , stir evenly to obtain solution b;

[0032] 2) Mix solution a obtained in 1) with solution b, stir and swell to obtain solution c;

[0033] 3) Spread the solution c obtained in 2) on a 10cm×10cm non-woven fabric, and place it in a blast drying oven at 50°C for 2 hours;

[0034] 4) arrange the non-woven fabric dried in 3) in a 2% sodium hydroxide solution, separate from the non-woven fabric to obtain a uniform and transparent film d;

[0035] 5) Wash the film d obtained in 4) with wat...

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Abstract

The invention discloses a preparation method of a metal ion selective separation composite membrane. The preparation method is characterized in that the composite membrane utilizes polyvinylidene fluoride as a framework material of natural biological material chitosan, so that the mechanical property and a reusing property of a chitosan membrane are strengthened; a molecular imprinting technology is imported, so that a metal ion has a selective separation function. The preparation method takes soluble salt of chitosan, polyvinylidene fluoride and metal M as a raw material to prepare an M ion imprinting chitosan / polyvinylidene fluoride composite membrane by process of sol-gel and templated processing, the preparation technology is simple, the cost is low, the condition is gentle, and the preparation method is pollution-free. The composite membrane provided by the invention has the advantages that metal M ions in a water body are removed selectively with high efficiency and low cost, and the composite membrane belongs to the technical field of water body heavy metal membrane separation and has remarkable environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to a preparation method of a metal ion selective separation composite membrane. The invention belongs to the technical field of membrane separation. Background technique [0002] Chitosan has good adsorption properties for metal ions, and can be used in the fields of industrial wastewater treatment and natural water purification. However, due to its non-selective adsorption of metal ions, it is not conducive to the subsequent separation and resource utilization of the adsorbed metal ions. Molecular imprinting technology can make chitosan have selective adsorption function. Through the introduction of molecular imprinting technology, our research group successfully prepared Ni 2+ Spherical adsorbent with exclusive adsorption properties (patent 200610130671.5). [0003] Membrane separation technology is the most important water treatment technology in the 21st century, and membrane-like adsorbents are more advantageous in some s...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/24B01J20/30B01D71/08B01D71/34B01D69/12B01D67/00
Inventor 唐雪娇段雨欣甘兰汪磊张志丹章逸凡
Owner NANKAI UNIV
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