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Preparation method of heavy metal chelating adsorbent

A technology for chelating adsorbents and heavy metals, which is applied in the field of preparation of heavy metal chelating adsorbents, can solve the problems of limited use range, low adsorption regeneration rate, high operating cost, etc. Simple method, good selectivity

Inactive Publication Date: 2013-06-12
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its application is limited due to its high cost, low adsorption regeneration rate, and high operating cost.
[0003] In recent years, there have been extensive studies and reports on heavy metal chelating agents of DTC derivatives. Researchers have selected two heavy metal ion chelating agents containing dithiocarbamate functional groups to remove heavy metal ions, but most of them are liquid, which is inconvenient for storage and transportation. The scope of use is limited and the performance is not ideal

Method used

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  • Preparation method of heavy metal chelating adsorbent

Examples

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Embodiment 1

[0022] Taking raw material diethylenetriamine 11mL as example, the method for preparing this heavy metal chelating adsorbent consists of the following steps:

[0023] (1) Take 10g of sodium hydroxide to prepare a solution with a concentration of 2.5mol / L, stir and wait for cooling, then add 11mL of diethylenetriamine and 14mL of carbon disulfide, the molar ratio of diethylenetriamine to carbon disulfide and sodium hydroxide is 1 :2.3:2.5, stir and mix well, react at room temperature for 1h, until the reaction solution is orange-yellow.

[0024] (2) Add 10mL of epichlorohydrin dropwise to the reaction solution at a rate of 1 drop / s, the molar ratio of diethylenetriamine to epichlorohydrin is 1:1, stir and mix well, and heat at 60°C In a water bath, react for 4 hours to obtain a solid product.

[0025] (3) Take out the solid product and wash it once with distilled water, once with acetone, twice with ethanol, and then with distilled water until the pH of the product is 7.0 to p...

Embodiment 2

[0027] Taking 11mL of raw material diethylenetriamine as an example, the method for preparing heavy metal chelating adsorbent consists of the following steps:

[0028] (1) Take 10g of sodium hydroxide to prepare a solution with a concentration of 2.5mol / L, stir and wait for cooling, then add 11mL of diethylenetriamine and 12mL of carbon disulfide, the molar ratio of diethylenetriamine to carbon disulfide and sodium hydroxide is 1 : 1.99:2.5, stirred and mixed, reacted at room temperature for 1h, until the reaction solution was orange-yellow.

[0029] (2) Add 8mL of epichlorohydrin dropwise to the reaction solution at a rate of 1 drop / s, the molar ratio of diethylenetriamine to epichlorohydrin is 1:0.8, stir and mix well, and heat at 60°C In a water bath, react for 4 hours to obtain a solid product.

[0030] Other steps are the same as in Example 1 to prepare a heavy metal chelating adsorbent.

Embodiment 3

[0032] Taking 11mL of raw material diethylenetriamine as an example, the method for preparing heavy metal chelating adsorbent consists of the following steps:

[0033] (1) Take 10g of sodium hydroxide to prepare a solution with a concentration of 2.5mol / L, stir and wait for cooling, then add 11mL of diethylenetriamine and 16mL of carbon disulfide, the molar ratio of diethylenetriamine to carbon disulfide and sodium hydroxide is 1 :2.65:2.5, stirred and mixed, reacted at room temperature for 1h, until the reaction solution was orange-yellow.

[0034] (2) Add 12mL of epichlorohydrin dropwise to the reaction solution at a rate of 1 drop / s, the molar ratio of diethylenetriamine to epichlorohydrin is 1:1.2, stir and mix well, and heat at 60°C In a water bath, react for 4 hours to obtain a solid product.

[0035] Other steps are the same as in Example 1 to prepare a heavy metal chelating adsorbent.

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Abstract

The invention relates to a preparation method of a heavy metal chelating adsorbent. A macromolecular organic heavy metal chelating adsorbent with good chemical stability is prepared by crosslinking and polymerizing four monomers including diethylenetriamine, carbon disulfide, sodium hydroxide and epoxy chloropropane under a certain conditions. The heavy metal chelating adsorbent has good selectivity, adsorption performance and renewable performance on heavy metal wastewater, in particular heavy metal ion, such as Ni<2+>, Cr<6+>, Cu<2+>, Zn<2+>, Pb<2+> and the like in sewage, such as chemical nickel plating waste liquid, electroplating waste liquid and the like. The preparation method disclosed by the invention is simple and free from by-products and is applicable to industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering polymer chelating adsorbent research, in particular to a preparation method of a heavy metal chelating adsorbent. Background technique [0002] In recent years, with the continuous development of my country's industrialization and urbanization, heavy metal pollution incidents have occurred frequently. How to effectively remove heavy metal ions in wastewater has become an urgent problem to be solved. Since the composition of heavy metal wastewater is very complex and cannot be decomposed and destroyed, it can only transfer their existing location or change their physical and chemical forms to reduce their toxicity. Adsorption method is one of the most commonly used methods to remove heavy metal ions. It can effectively remove toxic heavy metal ions in wastewater that are difficult to be effectively treated by other methods. It is simple to operate, high in efficiency, and the eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62C02F103/16
Inventor 刘转年
Owner XIAN UNIV OF SCI & TECH
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