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Sorption of zinc by novel pH-sensitive hydrogels based on chitosan, itaconic acid and methacrylic acid

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2011
Authors
Milosavljevic, Nedeljko B.
Ristic, Mirjana D.
Peric-Grujic, Aleksandra A.
Filipovic, Jovanka M.
Štrbac, Svetlana
Rakočević, Zlatko Lj.
Kalagasidis Krušić, Melina
Article (Published version)
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Abstract
Novel pH-sensitive hydrogels based on chitosan, itaconic acid and methacrylic acid were applied as adsorbents for the removal of Zn(2+) ions from aqueous solution. In batch tests, the influence of solution pH, contact time, initial metal ion concentration and temperature was examined. The sorption was found pH dependent, pH 5.5 being the optimum value. The adsorption process was well described by the pseudosecond order kinetic. The hydrogels were characterized by spectral (Fourier transform infrared-FTIR) and structural (SEM/EDX and atomic force microscopy-AFM) analyses. The surface topography changes were observed by atomic force microscopy, while the changes in surface composition were detected using phase imaging AFM. The negative values of free energy and enthalpy indicated that the adsorption is spontaneous and exothermic one. The best fitting isotherms were Langmuir and Redlich-Peterson and it was found that both linear and nonlinear methods were appropriate for obtaining the iso...therm parameters. However, the increase of temperature leads to higher adsorption capacity, since swelling degree increased with temperature.

Keywords:
Hydrogel / Kinetic model / Adsorption isotherm / Separation / Atomic force microscopy
Source:
Journal of Hazardous Materials, 2011, 192, 2, 846-854
Publisher:
  • Elsevier Science Bv, Amsterdam
Projects:
  • Synthesis and characterization of novel functional polymers and polymeric nanocomposites (RS-172062)
  • Development and Application of Methods and Materials for Monitoring New Organic Contaminants, Toxic Compounds and Heavy Metals (RS-172007)

DOI: 10.1016/j.jhazmat.2011.05.093

ISSN: 0304-3894

PubMed: 21703762

WoS: 000293314000055

Scopus: 2-s2.0-79960164022
[ Google Scholar ]
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/805
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