Spray-dried chitosan microspheres containing 8-hydroxyquinoline -5 sulphonic acid as a new adsorbent for Cd(II) and Zn(II) ions.
In the present study, a new chelating adsorbent was prepared from chitosan microspheres cross-linked with glutaraldehyde by spray drying using 8-hydroxyquinoline -5 sulphonic acid as chelant agent (CTS-SX-CL). Microspheres of the new adsorbent were characterized by Raman spectroscopy, scanning electron microscopy (SEM) and energy-dispersive X-ray microanalysis (EDX). The effect of pH, contact time and concentration of metallic ions in solution were evaluated on the adsorption behavior of Cd(II) and Zn(II) by CTS-SX-CL. Adsorption was maximum for both Cd(II) and Zn(II) at pH 8.0. Adsorption kinetic curves were obtained and could be fit by the pseudo second-order adsorption model. An analysis of equilibrium adsorption data using the Langmuir isotherm model indicated that the maximum adsorption capacity of CTS-SX-CL was higher than that of CTS-CL for both ions investigated. The adsorption capacity increased 74% for Cd(II).
Departamento de Química, Universidade Federal de Santa Catarina, Cep. 88040-900, Florianópolis, SC, Brazil.
Luciano
L
Vitali
Mauro C M
MC
Laranjeira
Norberto S
NS
Gonçalves
Valfredo T
VT
Fávere
D000327:Adsorption; D002104:Cadmium / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D015125:Oxyquinoline / Q000031:analogs & derivatives* / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D015032:Zinc / Q000737:chemistry*
D002412:Cations; D002104:Cadmium; D015125:Oxyquinoline; C013053:8-hydroxyquinoline-5-sulfonic acid; D048271:Chitosan; D015032:Zinc