Preparation, Characterization and Thermodynamics of Cross-linked Low Molecular Weight Chitosan Pyruvic Acid Derivatives

2018 jecet  
Chitosan derivatives have gained significant interest as effective adsorbent for the removal of heavy metals due to outstanding characteristics such as the presence of amino and hydroxyl groups, non-toxicity, low cost and available in large quantities. In this present study, chitosan was degraded into two kinds of low molecular weight chitosan (CS8 and CS11), modified with pyruvic acid (PA), and then cross-linked with glutaraldehyde (GLA) to obtain cross-linked low molecular weight chitosan
more » ... weight chitosan pyruvic acid derivatives (CS8PA-GLA and CS11PA-GLA). The prepared CS8PA-GLA and CS11PA-GLA were characterized with Size Exclusion Chromatography (SEC), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Thermogravimetric / Differential Scanning Calorimetry (TG/DSC), X-Ray Diffraction (XRD) and Brunauer-Emmet-Teller (BET) methods. From all the characterization methods, the prepared sorbents exhibited excellent characteristics for heavy metal removal. The thermodynamic studies using Isothermal Titration Calorimetry (ITC) also indicated that the nature of nickel sorption was spontaneous and the binding of nickel onto the sorbent was enthalpically favoured.
doi:10.24214/jecet.c.7.3.20111 fatcat:r2rsactf4jbxfbvg4qsh6prb5m