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Preparation method and application of palladium adsorption material

An adsorption material and stirring reaction technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., to achieve the effect of easy elution and improvement of mass transfer resistance

Inactive Publication Date: 2014-07-02
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, chitosan and montmorillonite are mostly blended to form resin microspheres for recycling heavy metals. There is no report on preparing chitosan and montmorillonite into a film material for recycling precious metals.

Method used

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  • Preparation method and application of palladium adsorption material
  • Preparation method and application of palladium adsorption material
  • Preparation method and application of palladium adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of palladium adsorption material (chitosan-montmorillonite cross-linked blend film), comprises the following steps:

[0034] (1) Dissolve 1g chitosan in 40ml 2v / v% acetic acid, stir until a transparent solution is formed to obtain solution A; soak 0.1g montmorillonite with 10ml 2v / v% acetic acid, and sonicate for 2h until it is completely dispersed in the solution to obtain solution B;

[0035] (2) While stirring, add solution B to solution A dropwise, heat up to 50°C, and stir magnetically for 2 hours to obtain solution C;

[0036] (3) While stirring, add 0.5ml of 1wt% glutaraldehyde solution dropwise to solution C, and continue stirring for 4 hours to form a uniform yellow casting solution;

[0037] (4) Apply the casting solution on the support body, place it in an oven at 55°C and dry it to form a uniform and transparent yellow film material;

[0038] (5) Immerse the yellow membrane material in 4wt% NaOH solution, solidify for 2 hours, and fo...

Embodiment 2

[0040] In step (3), the amount of glutaraldehyde added is 0.1ml, 0.4ml, 0.5ml, 0.6ml, 0.8ml, 1.0ml of 1wt% glutaraldehyde aqueous solution, and other steps are the same as in Example 1.

[0041] As the amount of glutaraldehyde increases, the yellow color of the palladium adsorption material obtained in step (5) gradually deepens. After increasing to 0.6ml, the film is easy to break. Therefore, considering the physical properties and acid solubility of the adsorption material, chitosan and pentamethylene The mass ratio of dialdehyde is preferably 1000:(1-10), most preferably 1000:(5-6).

Embodiment 3

[0043] The preparation method of palladium adsorption material, comprises the following steps:

[0044] (1) Dissolve 2g chitosan in 100ml 3v / v% acetic acid, stir until a transparent solution is formed to obtain solution A; soak 0.1g montmorillonite with 10ml 3v / v% acetic acid, and sonicate for 2h until it is completely dispersed in the solution to obtain solution B;

[0045] (2) Under stirring, add solution B to solution A dropwise, heat up to 40°C, and stir magnetically for 2 hours to obtain solution C;

[0046] (3) While stirring, add 0.6ml of 2wt% glutaraldehyde solution dropwise to solution C, and continue stirring for 3 hours to form a uniform yellow casting solution;

[0047] (4) Apply the casting solution on the support body, place it in an oven at 80°C and dry it to form a uniform and transparent yellow film material;

[0048] (5) Immerse the yellow membrane material in 1wt% NaOH solution, solidify for 4 hours, and form a 0.5mm thick yellow translucent membrane mater...

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Abstract

The invention discloses a preparation method and application of a palladium adsorption material. The preparation method comprises the following steps: blending chitosan and montmorillonite, adding glutaraldehyde to serve as a cross-linking agent, and preparing a chitosan-montmorillonite cross-linking blended film. The defects that the chitosan is poor in mechanical performance and low in acid resistance can be overcome, the cross-linking blended film serves as a palladium adsorption material, and precious metal palladium can be effectively adsorbed and separated. The palladium adsorption material prepared by the method provided by the invention is in a film structure, serves as solid-phase packing to prepare an adsorption column and has the advantages of improving mass transfer resistance and promoting elution.

Description

technical field [0001] The invention relates to a preparation method and application of a palladium adsorption material. Background technique [0002] Metal palladium (Pd) is a metal with rare earth reserves, which is widely used in the preparation of industrial and automobile exhaust catalysts. It is of great economic significance to recover palladium from used products. The current recovery methods are mainly liquid-liquid extraction and precipitation method. A large amount of organic solvents are used in liquid-liquid extraction, which is easy to cause secondary pollution; precipitation method is easy to cause precious metals Loss. Solid phase extraction technology is 1 / 10 of the liquid-liquid extraction method because of its simple and fast extraction process (general analysis only takes 5-20 minutes); solvent saving, only 10% of the liquid-liquid extraction method; good reproducibility and The recovery rate is high, and the introduction of impurities is reduced, and i...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 刘健李耀威杨明珠
Owner SOUTH CHINA NORMAL UNIVERSITY
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