Synthesis and characterization of a chitosan ligand for the removal of copper from aqueous media

Abstract

A novel chitosan derivative, 8‐hydroxyquinioline‐2‐carboxaldehydechitosan (CSHQ) Schiff base, was synthesized by a simple condensation process. The structure of the resulting product was confirmed by Fourier transform infrared spectroscopy, solid‐state 13C‐NMR, differential scanning calorimetry, scanning electron microscopy, and energy‐dispersive X‐ray spectroscopy. Further, the synthesized CSHQ Schiff base was used as an adsorbent for the removal of Cu(II) from aqueous solution. The adsorption of Cu(II) onto CSHQ was strongly dependent on the pH value, and the optimum pH value obtained was pH 5. Among the pseudo‐first‐order (PFO), pseudo‐second‐order (PSO), and intraparticle diffusion model simulation, the experimental data followed PSO kinetics well. The Cu(II) adsorption process onto CSHQ obeyed the Langmuir isotherm model well rather than the Freundlich and Sips isotherm models; this suggested that a monolayer adsorption occurred on the surface of CSHQ. From the overall results, we found that Cu(II) was adsorbed onto CSHQ through oxygen, nitrogen and pyridine nitrogen donor atoms and that CSHQ could be a promising adsorbent for water treatment. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4542–4550, 2013

Three-Dimensional Porous Spinel Ferrite as an Adsorbent for Pb(II) Removal from Aqueous Solutions

“…This indicated that the Langmuir condition was the ideal one for the adsorption mechanism. 57 The results of the Redlich−Peterson isotherm also supported the suitability of the Langmuir model.…”

Removal of cadmium from aqueous solution using low molecular weight chitosan derivative

“…1C shows the FTIR spectra of CS 8 (a), low molecular weight chitosan pyruvic acid derivative (b) and cross-linked low molecular weight chitosan pyruvic acid derivative (c). The most important bands for the low molecular weight chitosan (CS 8 ) can be ascribed as follows: 3340 cm −1 ( OH and NH 2 group stretching vibrations), 2930 cm −1 ( CH stretch in CH as well as CH 2 ), 1593 cm −1 (NH 2 bending vibration), 1404 cm −1 ( CH symmetric bending vibrations in CHOH ), 1074 cm −1 ( CO stretch in COH ) (Reddy & Lee, 2013). Subsequent to the modification of low molecular weight chitosan with pyruvic acid, a new band belonging to COOH at 1734 cm −1 was observed.…”

Immobilization of Chromium in Tannery Sludge Using Iron-Based Nanoparticles and Nanobiocomposites

“…The pH of solution is one of the important parameters since it influences the surface charge and dissociation of the functional groups on the adsorbents. pH also alters the degree of ionization and speciation of the metal ions (Reddy and Lee 2013). The normal pH of the sludge was found to be 8.5.…”