Silica gel extraction agent containing quaternary ammonium positive ions and salicylaldoxime

Abstract

The invention relates to a silica gel extraction agent containing quaternary ammonium positive ions and salicylaldoxime. The silica gel extraction agent containing quaternary ammonium positive ions and salicylaldoxime is prepared by the following steps: by adopting 3-(N, N-dialkylamine propyl) trialkoxyl silane as an organic alkoxyl silane coupling agent and 5-chloromethyl salicylaldehyde as a functional reagent, introducing quaternary ammonium positive ions and salicylaldoxime on the surface of silica gel through a chemical reaction; and further converting the silica gel into the functional silica gel with quaternary ammonium positive ions and salicylaldoxime on the surface as a solid phase extraction agent for metal ions. The silica gel extraction agent containing quaternary ammonium positive ions and salicylaldoxime provided by the invention has high hydrophilicity, can quickly and selectively chelate and adsorb heavy metal ions in an aqueous solution, and has the fast exchange characteristic of negative ions.

Description

technical field [0001] The invention relates to a solid-phase extractant, in particular to a silica gel extractant containing quaternary ammonium cations and salicylaldoxime, and belongs to the field of functional materials. technical background [0002] Solid phase extraction is a physical extraction process including liquid phase and solid phase. During the extraction process, the solid phase (extractant) has a greater adsorption force on the extracted substance than the sample base liquid. When the sample base liquid fully contacts with the solid phase, the extracted The substance is adsorbed on the surface of the solid phase, and other components in the sample base fluid remain in the sample base fluid, so as to achieve the purpose of separation, enrichment and purification of the extracted substance. One of the core technologies of solid-phase extraction is a solid-phase extraction agent with excellent cost performance. An excellent solid-phase extraction agent should h...

AI Technical Summary

Problems solved by technology

5-Alkyl salicylaldoxime is an important extractant in current hydrometallurgy copper smelting. It has large extraction capacity, good extraction performance and copper-iron separation coefficient as high as 450-550. When the concentration of alkyl salicylaldehyde / copper complex is high, precipitation is easy to occur; and during stripping, there are problems such as entrainment of free residual acid in the regenerated organic phase, long separation time of two-phase chromatography, and a small amount of emulsion

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