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Novel hexamethylene diamine-functionalized macroporous copolymer for chromium removal from aqueous solutions

Authorized Users Only
2017
Authors
Marković, Bojana
Stefanović, Ivan
Hercigonja, Radmila
Pergal, Marija
Markovic, Jelena P.
Onjia, Antonije E.
Nastasović, Aleksandra
Article (Published version)
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Abstract
Macroporous copolymers of poly[(glycidyl methacrylate)-co-(ethylene glycol dimethacrylate)] (PGME) with various crosslinker (ethylene glycol dimethacrylate) concentrations and porosity parameters and additionally functionalized with hexamethylene diamine (PGME-HD) were tested as potential Cr(VI) oxyanion sorbents from aqueous solutions. Kinetics of Cr(VI) sorption was investigated in the temperature range 298-343 K and the results were fitted to chemical reaction and particle diffusion models. The Cr(VI) sorption obeys the pseudo-second-order model with definite influence of pore diffusion. A temperature rise promotes chromium removal, with a maximum experimental uptake capacity of 4.21 mmol g(-1) at 343 K for the sample with the highest amino group concentration. Equilibrium data were analysed with Langmuir, Freundlich and Temkin adsorption isotherm models. Thermodynamic parameters, i.e. Gibbs free energy (G(0)), enthalpy (H-0) and entropy change (S-0) and activation energy of sorptio...n (E-a), were calculated. The Cr(VI) adsorption onto PGME-HD was found to be spontaneous and endothermic, with increased randomness in the system. Desorption experiments show that chromium anion sorption was reversible and the PGME-HD sample GMA 60 HD was easily regenerated with 0.1 mol L-1 NaOH up to 90% recovery in the fourth sorption/desorption cycle. In the fifth cycle, a substantial sorption loss of 37% was observed.

Keywords:
macroporous crosslinked copolymer / Cr(VI) / hexamethylene diamine / kinetic models / thermodynamics
Source:
Polymer International, 2017, 66, 5, 679-689
Publisher:
  • Wiley, Hoboken
Projects:
  • Advanced technologies for monitoring and environmental protection from chemical pollutants and radiation burden (RS-43009)
  • Synthesis and characterization of novel functional polymers and polymeric nanocomposites (RS-172062)
  • Oxide-based environmentally-friendly porous materials for genotoxic substances removal (RS-172018)

DOI: 10.1002/pi.5306

ISSN: 0959-8103

WoS: 000398731200009

Scopus: 2-s2.0-85007576495
[ Google Scholar ]
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2223
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