Synthesis and adsorption properties of chitosan-silica nanocomposite prepared by sol-gel method.

Tetyana M Budnyak,Valentin A Tertykh,Ievgen V Pylypchuk,Dorota Kolodynska,Elina S Yanovska

doi:10.1186/s11671-014-0722-1

Abstract

A hybrid nanocomposite material has been obtained by in situ formation of an inorganic network in the presence of a preformed organic polymer. Chitosan biopolymer and tetraethoxysilane (TEOS), which is the most common silica precursor, were used for the sol-gel reaction. The obtained composite chitosan-silica material has been characterized by physicochemical methods such as differential thermal analyses (DTA); carbon, hydrogen, and nitrogen (CHN) elemental analysis; nitrogen adsorption/desorption isotherms, scanning electron microscopy (SEM); and Fourier transform infrared (FTIR) spectroscopy to determine possible interactions between silica and chitosan macromolecules. Adsorption of microquantities of V(V), Mo(VI), and Cr(VI) oxoanions from the aqueous solutions by the obtained composite has been studied in comparison with the chitosan beads, previously crosslinked with glutaraldehyde. The adsorption capacity and kinetic sorption characteristics of the composite material were estimated.

Highlights

Nowadays, there is a great interest in the development of low-cost sorbents for water remediation
A derivative of chitin [5,6,7,8,9,10,11], is of great interest as an organic component in the composites developed for water treatment because of the high quantity of amino and hydroxyl groups, which is very important for sorption processes [12,13,14,15,16,17,18,19]
Physicochemical characteristics of the composite The sol-gel process can be viewed as a two-network forming process, the first step being the hydrolysis of silicon alkoxide and the second consisting in a polycondensation reaction

Summary

Introduction

There is a great interest in the development of low-cost sorbents for water remediation. A derivative of chitin [5,6,7,8,9,10,11], is of great interest as an organic component in the composites developed for water treatment because of the high quantity of amino and hydroxyl groups, which is very important for sorption processes [12,13,14,15,16,17,18,19].

Methods

Results

Conclusion