Partitioning of hydrophobic organic compounds to hydroxypropyl-{beta}-cyclodextrin: Experimental studies and model predictions for surfactant-enhanced remediation applications

Journal Article · Sun Aug 15 04:00:00 EDT 1999 · Environmental Science and Technology

DOI:https://doi.org/10.1021/es9813360· OSTI ID:687394

Ko, S O; Schlautman, M A; Carraway, E R ^[1]

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1. Texas A and M Univ., College Station, TX (United States). Dept. of Civil Engineering

Partitioning studies of hydrophobic organic compounds (HOCs) to hydropropyl-{beta}-cyclodextrin (HPCD) and one-dimensional transport simulations were conducted to evaluate the feasibility of using HPCD to remove sorbed HOCs in surfactant-enhanced remediation (SER) applications. HOC partitioning to HPCD was very fast, with over 95% of the complexation occurring within 10 min. Some influence of solution chemistry and HOC concentration on HOC-HPCD complex formation coefficients was observed; in general, the magnitude of the effects was similar to that observed previously for a nonionic surfactant (Tween 80) but much less than that for an anionic surfactant (sodium dodecyl sulfate, SDS). HPCD sorption on kaolinite as quantified by both a fluorescence technique and total organic carbon measurements was negligible, indicating no significant affinity of HPCD for the solid phase. Although the HOC solubilization capability of HPCD was lower than that of conventional surfactants such as SDS and Tween 80, transport simulations showed that HPCD can be effective in removing sorbed HOCs from a model subsurface environment, primarily because of its negligible sorption to the solid phase (i.e., all HPCD added facilitates HOC elution). However, in contrast with SDS and Tween 80, HPCD becomes relatively less effective for HOC partitioning with increasing HOC size and hydrophobicity. Therefore, comparisons between HPCD and conventional surfactants for enhanced remediation applications must consider the specific HOC(s) present and the potential for surfactant material losses to the solid phase as well as other generally recognized considerations such as material costs and potential toxicological effects.

• OSTI ID: 687394
• Journal Information: Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 16 Vol. 33; ISSN ESTHAG; ISSN 0013-936X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
DEXTRIN
ENVIRONMENTAL TRANSPORT
GROUND WATER
IN-SITU PROCESSING
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
REMEDIAL ACTION
SOIL CHEMISTRY
SOILS
SURFACTANTS