A kind of preparation and application method of cu(II) solid phase extractant based on carbon nanotubes

Abstract

The invention relates to a preparation and application method of a Cu(II) solid-phase extraction agent based on carbon nanotubes. Firstly, reflux 0.5-1g of carboxylated carbon nanotubes and 20mL of anhydrous thionyl chloride at 60-90°C for 1-2 day, suction filtration, and the filter residue was washed with anhydrous tetrahydrofuran and vacuum-dried overnight to obtain acylated carbon nanotubes; the acylated carbon nanotubes were dispersed in 0.1g 2,2′-dipyridylamine, 3mL triethylamine and 100mL anhydrous In a mixed solution composed of N,N-dimethylformamide in water, under the protection of nitrogen, reflux at 100°C for 48 hours, filter with suction, wash the filter residue three times with absolute ethanol, and dry it in vacuum for 1-2 days to obtain carbon nanotube-based Cu(II) solid phase extractant. Measure 5-20 mg of Cu(II) solid-phase extraction agent and fill it in a 6mL solid-phase extraction column of a solid-phase extraction device, and perform dynamic Cu(II) extraction on water samples containing 1-5 μg / L Cu(II) Enrichment, use 5mL of 1 ~ 3M dilute nitric acid to elute and detach the solid phase extractant enriched with Cu(II), the recovery rate of Cu(II) reaches 97%, and the solid phase extractant of Cu(II) after detachment The phase extractant can be recycled 4 to 5 times.

Description

technical field [0001] The invention relates to a preparation and application method of a Cu(II) solid phase extraction agent based on carbon nanotubes, in particular to a solid phase for enriching trace heavy metal copper ions (Cu(II)) in environmental water bodies and liquid samples Preparation of extractant and its application method. The invention belongs to the technical field of separation, analysis and detection. Background technique [0002] Copper metal is an element that exists widely in nature. Due to its good physical and chemical properties, copper metal has a wide range of uses in industry, and with the development of science and technology, its application range is continuously expanding, which makes copper in the environment sustainable. increase, leading to copper pollution in the environment. [0003] Copper is extremely toxic to aquatic organisms. When the concentration of copper (Cu(ID) in water is 0.5mg / L, it can kill 35-100% of freshwater plants, and ...

AI Technical Summary

Problems solved by technology

However, mature commercial products are still relatively lacking, so it is still of great significance to develop new efficient, simple and fast Cu(II) solid phase extraction materials.