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Removal of hexavalent chromium by new quaternized crosslinked poly(4-vinylpyridines).
J Hazard Mater. 2010 Nov 15; 183(1-3):533-40.JH

Abstract

New quaternized crosslinked poly(4-vinylpyridines) prepared by nucleophilic substitution reactions of 4-vinylpyridine: divinylbenzene copolymers of gel and porous structure with halogenated compounds such as benzyl chloride and 2-chloracetone, were used to remove Cr(VI) from the aqueous solution. Batch adsorption studies were carried out to determine the effect of the initial concentration of Cr(VI), pH, temperature and the presence of sulfate anions. The process was found to be pH and concentration dependent. The adsorption capacities increase with the increase of the initial concentration of Cr(VI) and both resins exhibited the degrees of usage of the exchange capacities higher than 90% and good efficiency in the chromium removal. Equilibrium modeling of the process of Cr(VI) removal was carried out by using the Langmuir and Freundlich isotherms. The experimental data obeyed these isotherm models. The thermodynamic parameters (free energy change ΔG, enthalpy change ΔS and entropy change ΔH) for the adsorption have been evaluated and therefore, it was showed the spontaneous and endothermic process of the adsorption of Cr(VI) on the pyridine resins. In the competitive adsorption studies, chromate/sulfate revealed the selectivity of the pyridine adsorbents towards chromium ions. At acidic pH the synthesized pyridine resins offer much greater chromate removal capacities compared to alkaline pH. In the competitive adsorption studies, chromate/sulfate revealed the selectivity of the pyridine adsorbents towards chromium ions due to the formation a sandwich arrangement with the chromium anion and functional groups attached to the quaternary nitrogen atom.

Authors+Show Affiliations

Petru Poni Institute of Macromolecular Chemistry, Gr. Ghica Voda 41A, 700487 Iasi, Romania. vneagu@icmpp.roNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20692089

Citation

Neagu, Violeta, and Sergey Mikhalovsky. "Removal of Hexavalent Chromium By New Quaternized Crosslinked Poly(4-vinylpyridines)." Journal of Hazardous Materials, vol. 183, no. 1-3, 2010, pp. 533-40.
Neagu V, Mikhalovsky S. Removal of hexavalent chromium by new quaternized crosslinked poly(4-vinylpyridines). J Hazard Mater. 2010;183(1-3):533-40.
Neagu, V., & Mikhalovsky, S. (2010). Removal of hexavalent chromium by new quaternized crosslinked poly(4-vinylpyridines). Journal of Hazardous Materials, 183(1-3), 533-40. https://doi.org/10.1016/j.jhazmat.2010.07.057
Neagu V, Mikhalovsky S. Removal of Hexavalent Chromium By New Quaternized Crosslinked Poly(4-vinylpyridines). J Hazard Mater. 2010 Nov 15;183(1-3):533-40. PubMed PMID: 20692089.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of hexavalent chromium by new quaternized crosslinked poly(4-vinylpyridines). AU - Neagu,Violeta, AU - Mikhalovsky,Sergey, Y1 - 2010/07/21/ PY - 2010/03/15/received PY - 2010/06/09/revised PY - 2010/07/13/accepted PY - 2010/8/10/entrez PY - 2010/8/10/pubmed PY - 2010/12/29/medline SP - 533 EP - 40 JF - Journal of hazardous materials JO - J Hazard Mater VL - 183 IS - 1-3 N2 - New quaternized crosslinked poly(4-vinylpyridines) prepared by nucleophilic substitution reactions of 4-vinylpyridine: divinylbenzene copolymers of gel and porous structure with halogenated compounds such as benzyl chloride and 2-chloracetone, were used to remove Cr(VI) from the aqueous solution. Batch adsorption studies were carried out to determine the effect of the initial concentration of Cr(VI), pH, temperature and the presence of sulfate anions. The process was found to be pH and concentration dependent. The adsorption capacities increase with the increase of the initial concentration of Cr(VI) and both resins exhibited the degrees of usage of the exchange capacities higher than 90% and good efficiency in the chromium removal. Equilibrium modeling of the process of Cr(VI) removal was carried out by using the Langmuir and Freundlich isotherms. The experimental data obeyed these isotherm models. The thermodynamic parameters (free energy change ΔG, enthalpy change ΔS and entropy change ΔH) for the adsorption have been evaluated and therefore, it was showed the spontaneous and endothermic process of the adsorption of Cr(VI) on the pyridine resins. In the competitive adsorption studies, chromate/sulfate revealed the selectivity of the pyridine adsorbents towards chromium ions. At acidic pH the synthesized pyridine resins offer much greater chromate removal capacities compared to alkaline pH. In the competitive adsorption studies, chromate/sulfate revealed the selectivity of the pyridine adsorbents towards chromium ions due to the formation a sandwich arrangement with the chromium anion and functional groups attached to the quaternary nitrogen atom. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/20692089/Removal_of_hexavalent_chromium_by_new_quaternized_crosslinked_poly_4_vinylpyridines__ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(10)00942-8 DB - PRIME DP - Unbound Medicine ER -