A functional group modified silica adsorbent and its preparation process and application

Abstract

This application relates to a functional group-modified silica adsorbent, its preparation process, and its application, falling within the field of adsorption and separation technology. First, 3-aminopropyltriethoxysilane and lysine undergo a condensation reaction in the presence of a condensing agent to generate an amino-containing silane coupling agent. Subsequently, succinic anhydride is used to perform a ring-opening reaction on this intermediate to prepare a carboxyl-containing modified silane. Finally, the carboxyl-containing modified silane is immobilized onto the surface of silica nanoparticles via a grafting reaction, thereby obtaining a carboxyl-modified silica adsorbent. It exhibits strong and specific coordination adsorption of zinc ions in alcohol solvent systems, demonstrating high adsorption capacity; even at trace concentrations of metal ions, the adsorbent maintains excellent adsorption performance. It can be efficiently used for the deep removal of zinc ions from methanol, ethanol, and isopropanol solvents, showing broad application prospects in solvent purification and related separation fields.

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