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Chelate resin immobilized with dendrimer and preparation method thereof

A dendrimer, chelating resin technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as unfavorable reuse, difficult product purification, excessive raw materials, etc. Selectivity and adsorption capacity, simplify separation and purification process, improve adsorption performance

Inactive Publication Date: 2010-09-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the synthesis of dendrimers requires a large amount of raw materials, the product is difficult to purify, and the yield is low. At the same time, although its good water solubility is beneficial to the adsorption of metal ions in water, it is not conducive to the repeated use after adsorption.

Method used

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  • Chelate resin immobilized with dendrimer and preparation method thereof
  • Chelate resin immobilized with dendrimer and preparation method thereof
  • Chelate resin immobilized with dendrimer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Chelating resin preparation steps of dendrimers containing amide groups (-COOH or -COONa group modification).

[0031] (1) Select 40-60 mesh commercial chlorine balls, wash with deionized water, 5% hydrochloric acid, deionized water, and 5% sodium hydroxide for more than 3 times, then wash with deionized water until neutral, and extract with ethanol Remove the impurities in it more than 5 times, and then swell for 12-60h.

[0032] (2) Add 50g of pretreated chlorine balls into a three-necked flask, use methanol as a solvent, and add 15- Add 70% hexamethylenetetramine dropwise within 60 minutes, use 20-55% sodium hydroxide solution to adjust pH > 9.5, react at temperature > 15°C for more than 5 hours, remove the mother liquor, and use concentrated hydrochloric acid The resin was treated with alcohol solution, then washed with water and extracted with ethanol for more than 1 hour.

[0033] (3) Put 20g of the product obtained in "step (2)" into a three-necked flask, add 2...

Embodiment 2

[0037] The preparation step of the chelating resin containing amide group dendrimers (containing P group modification).

[0038] (1), (2) are the same as Example 1, step (3) obtains G3.0 product.

[0039] (4) Add the product obtained in "step (3)" into a three-necked flask, add alcohol 150ml, according to the amino group content on the product: vinyl phosphonate = 1: (1.5-3.0) material ratio, at 5 Add vinyl phosphonate under stirring conditions at -100°C, react for 5-40 hours, then filter and wash to obtain chelating resin.

Embodiment 3

[0041] Preparation of Chelating Resin Containing Imino Dendrimers (Alkyl Arsine Modification).

[0042] (1), (2) are the same as Example 1.

[0043] (3) Put 20g of the product obtained in "step (2)" into a three-necked flask, add 20-100ml of alcohol, add 2-30g of acetonitrile dropwise at 3-55°C under stirring conditions, and react for 6-30h to get The half-generation product G0.5; the half-generation resin is hydrogenated under the catalysis of Raney Co (or reduced by tetrahydrolithium aluminum) to obtain the G1.0 product whose terminal group is an amine group. Repeat the preceding steps until the G4.0 product is obtained.

[0044] (4) The product obtained in "step (3)" is added in a three-necked flask, and haloalkyl arsine is added by 0.9-1.8 times of the amount of the amine-based substance, then filtered and washed to obtain a chelating resin.

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Abstract

The invention relates to a method for preparing a chelate resin immobilized with dendrimer, which is characterized in that the chelate resin immobilized with the dendrimer uses a macroporous resin as a framework, is immobilized or anchored with the hydrophilic dendrimer; and the immobilized dendrimer is modified by introducing functional groups to prepare the novel chelate resin with high selectivity and adsorption capacity. The framework of the chelate resin is a polystyrene macroporous resin and has 5 to 25 percent of crosslinking degree, 5 to 800 meshes of grain diameter and 40 to 2,500 nm of average pore size of the pore channel. The amount of the generations of immobilized hydrophilic dendrimer is between 2 and 9 generations. The functional groups for modifying the dendrimer comprise -COOH (or -COONa), -OH, N, P or As. The chelate resin is mainly used for low-concentration valuable metal recovery and heavy metal treatment in the waste water. The chelate resin absorbing specific metals can be used as a catalyst.

Description

Technical field: [0001] The invention belongs to the field of polymer synthesis, and in particular relates to a chelating resin immobilized with dendrimers and a preparation method thereof. technical background: [0002] Electroplating wastewater, electronics industry wastewater, and non-ferrous metal mining, dressing and smelting wastewater contain a large amount of heavy metals. These heavy metal-containing wastewater have caused great harm to the human living environment. It is important to reduce the content of heavy metals in wastewater and reduce the pollution of heavy metals to the environment. environmental and economic benefits. Traditional treatment methods for wastewater containing heavy metals include chemical precipitation and coagulation, ion exchange / adsorption, electrochemical methods, redox methods, and membrane separation techniques. Among them, the ion exchange / adsorption method mainly uses synthetic ion exchange resins. Because the cross-linked polymer s...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F8/00C08F8/32C08F8/30B01J20/26C02F1/62C02F1/28
Inventor 刘耀驰黄可龙刘素琴王春志黄敬刘美华林经萍
Owner CENT SOUTH UNIV
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