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Thermodynamics of Chromium(VI) Anionic Species Sorption onto Surfactant-Modified Montmorillonite Clay.
J Colloid Interface Sci. 2000 Sep 01; 229(1):230-236.JC

Abstract

Batch sorption experiments performed on Cr(VI) species sorption showed a significantly enhanced removal of inorganic hexavalent chromium anionic species from aqueous solution by montmorillonite clays modified with quaternary amine, hexadecyltrimethylammonium (HDTMA) bromide. Unmodified clay had no affinity for chromium(VI) species. The sorption of Cr(VI) species has been carried out as a function of pH, contact time, adsorbate concentration (4.14x10(-5) to 8.62x10(-3) M), and temperature (5-45 degrees C). The surfactant-modified clay surface was stable when exposed to extremes in pH. The optimum pH for maximum sorption of Cr(VI) species was found to be at pH 1 and was constant between pH 2 and pH 6. The sorption data obtained was well described by DKR and Langmuir sorption isotherms. Sorption energy (E) for (i) surfactant sorption by montmorillonite clay and (ii) sorption of chromium(VI) species by surfactant modified clay have been computed from the DKR equation. Sorption energy evaluated for the sorption of both surfactant and Cr(VI) species showed that an ion-exchange mechanism was operative. The mechanism of retention appears to be replacement of counterion of the surfactant by Cr(VI) anionic species. Adsorbent capacity for the sorption of Cr(VI) species has been evaluated from the Langmuir sorption isotherm data. Thermodynamic parameters (Delta H degrees, Delta S degrees and Delta G degrees) for surfactant sorption on montmorillonite clay and Cr(VI) sorption by modified clay have been evaluated. The specific rate constant for sorption of Cr(VI) species on modified montmorillonite was rapid during the first 10 min and equilibrium was found to be attained within 30 min. The sorption of Cr(VI) species onto modified montmorillonite clay followed first-order rate kinetics. Copyright 2000 Academic Press.

Authors+Show Affiliations

Department of Chemistry, Bangalore Institute of Technology, K. R. Road, Bangalore, 560 004, IndiaNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

10942564

Citation

Krishna, BS, et al. "Thermodynamics of Chromium(VI) Anionic Species Sorption Onto Surfactant-Modified Montmorillonite Clay." Journal of Colloid and Interface Science, vol. 229, no. 1, 2000, pp. 230-236.
Krishna BS, Murty DS, Jai Prakash BS . Thermodynamics of Chromium(VI) Anionic Species Sorption onto Surfactant-Modified Montmorillonite Clay. J Colloid Interface Sci. 2000;229(1):230-236.
Krishna, B. S., Murty, D. S., & Jai Prakash BS, . (2000). Thermodynamics of Chromium(VI) Anionic Species Sorption onto Surfactant-Modified Montmorillonite Clay. Journal of Colloid and Interface Science, 229(1), 230-236.
Krishna BS, Murty DS, Jai Prakash BS . Thermodynamics of Chromium(VI) Anionic Species Sorption Onto Surfactant-Modified Montmorillonite Clay. J Colloid Interface Sci. 2000 Sep 1;229(1):230-236. PubMed PMID: 10942564.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Thermodynamics of Chromium(VI) Anionic Species Sorption onto Surfactant-Modified Montmorillonite Clay. AU - Krishna,BS, AU - Murty,DS, AU - Jai Prakash BS,, PY - 2000/8/16/pubmed PY - 2000/8/16/medline PY - 2000/8/16/entrez SP - 230 EP - 236 JF - Journal of colloid and interface science JO - J Colloid Interface Sci VL - 229 IS - 1 N2 - Batch sorption experiments performed on Cr(VI) species sorption showed a significantly enhanced removal of inorganic hexavalent chromium anionic species from aqueous solution by montmorillonite clays modified with quaternary amine, hexadecyltrimethylammonium (HDTMA) bromide. Unmodified clay had no affinity for chromium(VI) species. The sorption of Cr(VI) species has been carried out as a function of pH, contact time, adsorbate concentration (4.14x10(-5) to 8.62x10(-3) M), and temperature (5-45 degrees C). The surfactant-modified clay surface was stable when exposed to extremes in pH. The optimum pH for maximum sorption of Cr(VI) species was found to be at pH 1 and was constant between pH 2 and pH 6. The sorption data obtained was well described by DKR and Langmuir sorption isotherms. Sorption energy (E) for (i) surfactant sorption by montmorillonite clay and (ii) sorption of chromium(VI) species by surfactant modified clay have been computed from the DKR equation. Sorption energy evaluated for the sorption of both surfactant and Cr(VI) species showed that an ion-exchange mechanism was operative. The mechanism of retention appears to be replacement of counterion of the surfactant by Cr(VI) anionic species. Adsorbent capacity for the sorption of Cr(VI) species has been evaluated from the Langmuir sorption isotherm data. Thermodynamic parameters (Delta H degrees, Delta S degrees and Delta G degrees) for surfactant sorption on montmorillonite clay and Cr(VI) sorption by modified clay have been evaluated. The specific rate constant for sorption of Cr(VI) species on modified montmorillonite was rapid during the first 10 min and equilibrium was found to be attained within 30 min. The sorption of Cr(VI) species onto modified montmorillonite clay followed first-order rate kinetics. Copyright 2000 Academic Press. SN - 1095-7103 UR - https://www.unboundmedicine.com/medline/citation/10942564/Thermodynamics_of_Chromium_VI__Anionic_Species_Sorption_onto_Surfactant_Modified_Montmorillonite_Clay_ L2 - https://linkinghub.elsevier.com/retrieve/pii/jcis.2000.7015 DB - PRIME DP - Unbound Medicine ER -
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