Material and method for adsorbing heavy metals in aqueous solution

A technology for heavy metal ions and separation materials, applied in the direction of adsorption water/sewage treatment, solid adsorbent liquid separation, separation methods, etc., can solve problems such as the inability to remove or separate heavy metal ions

Active Publication Date: 2016-07-06
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And in the public report before the present invention, EGTA is only used as the complexing agent of certain metal ion in the solution, does not see any report as the purposes of heavy metal ion removal or separation
And the removal or separation of heavy metal ions in the solution cannot be achieved by using EGTA alone

Method used

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  • Material and method for adsorbing heavy metals in aqueous solution
  • Material and method for adsorbing heavy metals in aqueous solution
  • Material and method for adsorbing heavy metals in aqueous solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068]

[0069] In a 250mL round-bottom flask, mix 0.83g NaOH (20.75mmol) and 1.52g cetyltrimethylammonium bromide (CTAB, 4.2mmol) in 80mL water, stir at 80℃ for 30min, until CTAB is completely dissolved In the water. Subsequently, 1.24g of 3-(triethoxysilane)propylamine (5.6mmol) was added, and after stirring for 2h at 80°C, 7mL (3.46mmol) of ethyl orthosilicate was added dropwise, and the addition was completed in 30min, at 80°C. After continuing to stir for 2 hours, the reaction was stopped, and hot suction filtration was performed to obtain a white filter cake. After the filter cake was dried at 90° C., it was evenly dispersed in methanol (200 mL) containing 10 mL of hydrochloric acid, stirred under reflux for 24 hours, filtered to obtain a white solid, and dried to obtain amino-functionalized mesoporous silica particles.

[0070]

[0071] Weigh 500 mg of ethylene glycol diethyl ether diamine tetraacetic acid (EGTA, 1.3 mmol) and mix in 50 mL of deionized water. Then prepar...

Embodiment 2

[0073]

[0074] Magnetic Fe 3 O 4 The particles were dispersed in chloroform, added to 10 mL of an aqueous solution containing 1.5 g of CTAB, stirred for 30 minutes to obtain an oil-water emulsion, and then heated to 60°C and stirred for 10 minutes to volatilize the chloroform. The above mixture was added to 60 mL of water and 0.6 mL of 2M sodium hydroxide solution, stirred and heated to 70°C. Then 1 mL (ethyl orthosilicate) TEOS was added. After 10 minutes, 100 μL of 3-aminopropyltriethoxysilane (APTES) was added, and stirring was continued for 3 hours. Centrifugation, ethanol washing three times, adding the particles to a Ph=1.4 hydrochloric acid ethanol solution, stirring at 60°C for 3 hours, centrifuging, ethanol washing three times, and drying to obtain magnetic mesoporous silica nanoparticles functionalized with surface amino groups.

[0075]

[0076] Weigh 500 mg of ethylene glycol diethyl ether diamine tetraacetic acid (EGTA, 1.3 mmol) and mix in 50 mL of deionized water...

Embodiment 3

[0078]

[0079] Weigh 500 mg of ethylene glycol diethyl ether diamine tetraacetic acid (EGTA, 1.3 mmol) and mix in 50 mL of deionized water. Then prepare a 2M NaOH solution, adjust the pH of the EGTA aqueous solution to about 5, and stir evenly until the solution becomes clear. Add 200 mg of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI, 1.0 mmol) and stir for 20 min. Then add 2.0 g of epoxy resin containing primary amine groups on the surface, and stir overnight at room temperature. After stopping the reaction, filter with suction and wash the resin particles with deionized water several times. The resin particles are taken out and dried at 90° C. to obtain an acceptor-modified epoxy resin.

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Abstract

The invention relates to material absorbing heavy metal in water solution and a method. The material is made through the fact that functional perssad is modified on the surface of various kinds of immobilized material, and the functional perssad is in covalent bonding with ethylene glycol tetraacetic acid (EGTA). The material can be used for remove of lead, mercury, cadmium, arsenic and other poisonous metal in the water solution, cannot change an adsorbing effect along with change of the immobilized material, and cannot change other components in the water solution. The material and the method have the advantages of being low in cost, wide in application range, strong in removing performance, good in selectivity, capable of being reproducible, and the like.

Description

Technical field [0001] The invention belongs to the field of metal separation. Specifically, the present invention relates to a material and method for separating heavy metals in aqueous solutions in a wide pH range. technical background [0002] In modern industry, heavy metal pollution is increasingly harmful to the ecological environment and human health. Heavy metals can interact strongly with proteins and various enzymes in the human body, causing them to lose their activity. They may also be enriched in certain organs of the human body. If they exceed the limit that the human body can tolerate, it will cause acute human poisoning. Subacute poisoning and chronic poisoning can cause great harm to the human body. For example, the Minamata disease (mercury pollution) and bone pain (cadmium pollution) that occurred in Japan are all caused by heavy metal pollution. [0003] Heavy metals are widely distributed in the atmosphere, water bodies, soil, and organisms. When the environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22C02F1/28C02F1/62B01D15/00
Inventor 朱维平钱旭红任龙徐玉芳
Owner EAST CHINA UNIV OF SCI & TECH
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