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Main chain type imidazole salt ionic polymer for hexavalent chromium anion detection and separation

An ionic polymer, imidazolium salt technology, applied in the field of water treatment, can solve the problems of no detection and separation of hexavalent chromium anions, poor chemical stability, slow removal rate, etc., to achieve good regeneration and circulation performance, uniform distribution, and easy separation. Effect

Inactive Publication Date: 2017-12-26
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium generally exists in the form of oxyanions in aqueous solutions, such as chromate and dichromate. So far, various materials and methods have been used for the detection and separation of chromium-containing anions in water, but these There are more or less problems in the materials, such as low adsorption capacity, slow removal rate, poor chemical stability, poor cycle ability, etc.
But so far, the main chain imidazolium salt ion polymer is mainly used for gas adsorption and catalytic reaction, and has not been used for the detection and separation of hexavalent chromium anions.

Method used

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  • Main chain type imidazole salt ionic polymer for hexavalent chromium anion detection and separation
  • Main chain type imidazole salt ionic polymer for hexavalent chromium anion detection and separation
  • Main chain type imidazole salt ionic polymer for hexavalent chromium anion detection and separation

Examples

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Effect test

Embodiment 1

[0016] Example 1 (Preparation and application of main chain imidazole salt ionic polymer IMIP-Br)

[0017] Add 1,2,4,5-tetra(bromomethyl)benzene dissolved in 20mL DMF dropwise to tris(4-imidazolylphenyl)amine dissolved in 20mL DMF, and heat the mixed solution to 100°C And keep it for 24h. After the reaction, the product was separated by centrifugation, washed and dried to obtain spherical IMIP-Br.

[0018] According to the result of elemental analysis, the content of imidazole cation in IMIP-Br is 3.15mmol g -1 , The maximum fluorescence emission wavelength is 496nm. When IMIP-Br is immersed in dichromate aqueous solutions of different concentrations, the fluorescence intensity of the separated solids will also be reduced to varying degrees, and IMIP-Br can be coated on commercial filter paper as the dichromate ion concentration Test paper. Disperse 6.9mg equivalent IMIP-Br in 20mL with a concentration of 0.55mmol L -1 In the dichromate aqueous solution, the ion exchange process...

Embodiment 2

[0019] Example 2 (Preparation and application of IMIP-Fe composite material with core-shell structure)

[0020] Add 200 mg of ferroferric oxide particles with a diameter of 400-500 nm to 20 mL of tris(4-imidazophenyl) amine-dissolved DMF solution. After ultrasonic dispersion, add 20 mL of 1,2,4,5-tetraferric oxide (Bromomethyl)benzene in DMF solution, react at 100°C for 24h. After the reaction, the product is separated by a magnet, washed and dried to obtain a brown powder product.

[0021] According to the result of elemental analysis, the content of imidazole cation in IMIP-Fe is 2.45mmol g -1 . Disperse 8.8mg equivalent IMIP-Fe in 20mL with a concentration of 0.55mmol L -1 When in dichromate aqueous solution, the ion exchange process can reach equilibrium within 5 minutes, and the final adsorption capacity can reach 249 mg g -1 , The removal rate is 94.2%. After the exchange is completed, IMIP-Fe can be separated from the water under the action of an external magnetic field, a...

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Abstract

Belonging to the technical field of water treatment, the invention relates to a main chain type imidazole salt ionic polymer material for detection and separation of hexavalent chromium anions in an aqueous solution. Quaternization reaction is carried out on a poly-imidazole monomer and poly-benzyl halide to obtain the main chain type imidazole salt ionic polymer with fluorescent properties. The polymer can utilize fluorescence quenching phenomenon to detect hexavalent chromium anions in an aqueous solution, and also can achieve rapid adsorption through ion exchange. Ferrosoferric oxide particles can be added in the preparation process of the imidazole salt polymer to obtain a magnetic composite material with the imidazole salt ionic polymer as the shell and ferrosoferric oxide as the core, the material also can be used for rapid adsorption of hexavalent chromium anions in water, and also can be easily separated from water under the action of an external magnetic field. The core-shell structure composite material also has good regeneration and recycling properties. In addition, the imidazole salt polymer material can also be extended to removal of other pollutant anions in water.

Description

Technical field [0001] The invention belongs to the technical field of water treatment, and specifically relates to the use of ionic polymers for the rapid detection and separation of hexavalent chromium anions in water. Background technique [0002] Hexavalent chromium is widely used in electroplating, metallurgy, leather processing and other industrial fields. It is also a common toxic heavy metal element in industrial wastewater. Hexavalent chromium is relatively stable and easily accumulates in organisms, which can cause gene mutations, deformities, and cancer. Hexavalent chromium generally exists in the form of oxygen-containing anions in aqueous solutions, such as chromate and dichromate. So far, there have been various materials and methods for the detection and separation of chromium-containing anions in water. The materials have more or less problems, such as low adsorption capacity, slow removal rate, poor chemical stability, and poor cycling ability. Therefore, the d...

Claims

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Application Information

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IPC IPC(8): C08G73/06C02F1/42C02F1/62G01N21/64
CPCC08G73/0616C02F1/42C02F2101/22C02F2103/16G01N21/6428G01N2021/6432
Inventor 王杨鑫赵怀霞王瑞虎
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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