Nonionic organic solute sorption onto two organobentonites as a function of organic-carbon content

Shannon L. Bartelt-Hunt, Susan E. Burns, James A. Smith

Research output: Contribution to journalArticle

116 Citations (Scopus)

Abstract

Sorption of three nonionic organic solutes (benzene, trichloroethene, and 1,2-dichlorobenzene) to hexadecyltrimethylammonium bentonite (HDTMA bentonite) and benzyltriethylammonium bentonite (BTEA bentonite) was measured as a function of total organic-carbon content at quaternary ammonium cation loadings ranging from 30 to 100% of the clay's cation-exchange capacity. Sorption of all three solutes to HDTMA bentonite was linear and sorption of all three solutes by the HDTMA bentonite increased as the organic-carbon content of the clay increased. 1,2-Dichlorobenzene sorbed most strongly to HDTMA bentonite, followed by benzene and TCE. The stronger sorption of benzene to HDTMA bentonite compared to TCE was unexpected based on a partition mechanism of sorption and consideration of solute solubility. Log Koc values for all three solutes increased with organic-carbon content. This suggests that the increased organic-carbon content alone may not explain the observed increase in sorption capacity. Sorption of the three solutes to BTEA bentonite was nonlinear and solute sorption increased with decreasing organic-carbon content, with a peak in the magnitude of solute sorption occurring at an organic-carbon content corresponding to 50% of CEC. Below 50% of CEC, sorption of all three solutes to BTEA bentonite decreased with decreasing organic-carbon content. Surface area measurements indicate that the surface area of both organobentonites generally decreased with increasing organic-carbon content. Since nonionic organic solute sorption to BTEA bentonite occurs by adsorption, the reduced sorption is likely caused by the reduction in surface area corresponding to increased organic-cation loading.

Original languageEnglish (US)
Pages (from-to)251-258
Number of pages8
JournalJournal of Colloid and Interface Science
Volume266
Issue number2
DOIs
StatePublished - Oct 15 2003

Fingerprint

Organic carbon
sorption
bentonite
Sorption
Bentonite
solutes
carbon
Benzene
Cations
Positive ions
benzene
cations
clays
Clay
Trichloroethylene
Ammonium Compounds
partitions
Ion exchange
solubility
Solubility

Keywords

  • 1,2-Dichlorobenzene
  • Adsorption
  • Bentonite
  • Benzene
  • Organic cations
  • Organoclay
  • Partitioning
  • Trichloroethylene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

Nonionic organic solute sorption onto two organobentonites as a function of organic-carbon content. / Bartelt-Hunt, Shannon L.; Burns, Susan E.; Smith, James A.

In: Journal of Colloid and Interface Science, Vol. 266, No. 2, 15.10.2003, p. 251-258.

Research output: Contribution to journalArticle

@article{d8e7c9f53e4940948b8fbce1b346524e,
title = "Nonionic organic solute sorption onto two organobentonites as a function of organic-carbon content",
abstract = "Sorption of three nonionic organic solutes (benzene, trichloroethene, and 1,2-dichlorobenzene) to hexadecyltrimethylammonium bentonite (HDTMA bentonite) and benzyltriethylammonium bentonite (BTEA bentonite) was measured as a function of total organic-carbon content at quaternary ammonium cation loadings ranging from 30 to 100{\%} of the clay's cation-exchange capacity. Sorption of all three solutes to HDTMA bentonite was linear and sorption of all three solutes by the HDTMA bentonite increased as the organic-carbon content of the clay increased. 1,2-Dichlorobenzene sorbed most strongly to HDTMA bentonite, followed by benzene and TCE. The stronger sorption of benzene to HDTMA bentonite compared to TCE was unexpected based on a partition mechanism of sorption and consideration of solute solubility. Log Koc values for all three solutes increased with organic-carbon content. This suggests that the increased organic-carbon content alone may not explain the observed increase in sorption capacity. Sorption of the three solutes to BTEA bentonite was nonlinear and solute sorption increased with decreasing organic-carbon content, with a peak in the magnitude of solute sorption occurring at an organic-carbon content corresponding to 50{\%} of CEC. Below 50{\%} of CEC, sorption of all three solutes to BTEA bentonite decreased with decreasing organic-carbon content. Surface area measurements indicate that the surface area of both organobentonites generally decreased with increasing organic-carbon content. Since nonionic organic solute sorption to BTEA bentonite occurs by adsorption, the reduced sorption is likely caused by the reduction in surface area corresponding to increased organic-cation loading.",
keywords = "1,2-Dichlorobenzene, Adsorption, Bentonite, Benzene, Organic cations, Organoclay, Partitioning, Trichloroethylene",
author = "Bartelt-Hunt, {Shannon L.} and Burns, {Susan E.} and Smith, {James A.}",
year = "2003",
month = "10",
day = "15",
doi = "10.1016/S0021-9797(03)00617-9",
language = "English (US)",
volume = "266",
pages = "251--258",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Nonionic organic solute sorption onto two organobentonites as a function of organic-carbon content

AU - Bartelt-Hunt, Shannon L.

AU - Burns, Susan E.

AU - Smith, James A.

PY - 2003/10/15

Y1 - 2003/10/15

N2 - Sorption of three nonionic organic solutes (benzene, trichloroethene, and 1,2-dichlorobenzene) to hexadecyltrimethylammonium bentonite (HDTMA bentonite) and benzyltriethylammonium bentonite (BTEA bentonite) was measured as a function of total organic-carbon content at quaternary ammonium cation loadings ranging from 30 to 100% of the clay's cation-exchange capacity. Sorption of all three solutes to HDTMA bentonite was linear and sorption of all three solutes by the HDTMA bentonite increased as the organic-carbon content of the clay increased. 1,2-Dichlorobenzene sorbed most strongly to HDTMA bentonite, followed by benzene and TCE. The stronger sorption of benzene to HDTMA bentonite compared to TCE was unexpected based on a partition mechanism of sorption and consideration of solute solubility. Log Koc values for all three solutes increased with organic-carbon content. This suggests that the increased organic-carbon content alone may not explain the observed increase in sorption capacity. Sorption of the three solutes to BTEA bentonite was nonlinear and solute sorption increased with decreasing organic-carbon content, with a peak in the magnitude of solute sorption occurring at an organic-carbon content corresponding to 50% of CEC. Below 50% of CEC, sorption of all three solutes to BTEA bentonite decreased with decreasing organic-carbon content. Surface area measurements indicate that the surface area of both organobentonites generally decreased with increasing organic-carbon content. Since nonionic organic solute sorption to BTEA bentonite occurs by adsorption, the reduced sorption is likely caused by the reduction in surface area corresponding to increased organic-cation loading.

AB - Sorption of three nonionic organic solutes (benzene, trichloroethene, and 1,2-dichlorobenzene) to hexadecyltrimethylammonium bentonite (HDTMA bentonite) and benzyltriethylammonium bentonite (BTEA bentonite) was measured as a function of total organic-carbon content at quaternary ammonium cation loadings ranging from 30 to 100% of the clay's cation-exchange capacity. Sorption of all three solutes to HDTMA bentonite was linear and sorption of all three solutes by the HDTMA bentonite increased as the organic-carbon content of the clay increased. 1,2-Dichlorobenzene sorbed most strongly to HDTMA bentonite, followed by benzene and TCE. The stronger sorption of benzene to HDTMA bentonite compared to TCE was unexpected based on a partition mechanism of sorption and consideration of solute solubility. Log Koc values for all three solutes increased with organic-carbon content. This suggests that the increased organic-carbon content alone may not explain the observed increase in sorption capacity. Sorption of the three solutes to BTEA bentonite was nonlinear and solute sorption increased with decreasing organic-carbon content, with a peak in the magnitude of solute sorption occurring at an organic-carbon content corresponding to 50% of CEC. Below 50% of CEC, sorption of all three solutes to BTEA bentonite decreased with decreasing organic-carbon content. Surface area measurements indicate that the surface area of both organobentonites generally decreased with increasing organic-carbon content. Since nonionic organic solute sorption to BTEA bentonite occurs by adsorption, the reduced sorption is likely caused by the reduction in surface area corresponding to increased organic-cation loading.

KW - 1,2-Dichlorobenzene

KW - Adsorption

KW - Bentonite

KW - Benzene

KW - Organic cations

KW - Organoclay

KW - Partitioning

KW - Trichloroethylene

UR - http://www.scopus.com/inward/record.url?scp=0141870166&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0141870166&partnerID=8YFLogxK

U2 - 10.1016/S0021-9797(03)00617-9

DO - 10.1016/S0021-9797(03)00617-9

M3 - Article

C2 - 14527447

AN - SCOPUS:0141870166

VL - 266

SP - 251

EP - 258

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

IS - 2

ER -