Investigation of Improving Amino Content on Hybridized Polyamine Silica Composites

Abstract

The aim of the present study was to improve amino content on the surface of polyamine silica composites. Results showed that amino contents of PAA/SiO₂ and EDA/SiO₂ prepared by surface substitution reaction were 1.491 mmol · g⁻¹ and 1.415 mmol · g⁻¹, and there were many residual chloropropyl groups on their surfaces. To increase amino contents, a technology of two-step reaction, first adding PAA for 10 h and adding EDA 14 h later, was established to prepare PAA-EDA/SiO₂. Comparing with those of PAA/SiO₂ and EDA/SiO₂, adsorption capacity and amino content of PAA-EDA/SiO₂ were improved significantly and reached up to 2.170 mmol · g⁻¹ and 0.724 mmol · g⁻¹, respectively.

Keywords:

• Amino content
• Ethylenediamine
• Poly(allylamine)
• Silica

Notes

*Experimental conditions of No. 1 were that PAA reaction time was 0 h and EDA reaction time was 24 h.