Sorption and desorption rates of carbon tetrachloride and 1,2-dichlorobenzene to three organobentonites and a natural peat soil
Journal Article
·
· Environmental Science and Technology
- Univ. of Virginia, Charlottesville, VA (United States). Dept. of Civil Engineering
The sorption and desorption rates of carbon tetrachloride (CCl{sub 4}) and 1,2-dichlorobenzene (1,2-DCB) to and from three organobentonites of varying alkyl-chain length were quantified. The effects of solute structure, organobentonite structure, and solute-sorbent contact time on the rates of solute mass-transfer were investigated. For each solute, the rate of sorption was compared to the rate of desorption. In addition, the rate of 1,2-DCB sorption to a natural peat soil was quantified. The experimental data were simulated using a two-site model and a model incorporating a continuous distribution of mass-transfer rate coefficients. Based on a statistical analysis of the model simulations, the following conclusions were made: (1) The rate of 1,2-DCB sorption to the organobentonites was significantly faster than the rate of 1,2-DCB sorption to the peat soil. (2) The rate of mass-transfer during sorption and desorption was greater for CCl{sub 4} than for 1,2-DCB. (3) The alkyl-chain lengths of the organobentonites did not affect the rate of mass-transfer during sorption; however, the rate of 1,2-DCB desorption decreased as the length of the organobentonite alkyl-chain increased. (4) The rate of solute desorption was slower than the rate of solute uptake for two of the three organobentonites. (5) For most environmental applications using the organobentonites studied here, a local equilibrium assumption will satisfactorily describe CCl{sub 4} and 1,2-DCB sorption and desorption.
- OSTI ID:
- 290179
- Journal Information:
- Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 20 Vol. 32; ISSN 0013-936X; ISSN ESTHAG
- Country of Publication:
- United States
- Language:
- English
Similar Records
Rate-limited sorption and desorption of 1,2-dichlorobenzene to a natural sand soil in a column system
Competitive Sorption and Desorption of Chlorinated Organic Solvents (DNAPLs) in Engineered Natural Organic Matter
Effects of Organic Matter Heterogeneity on Sorption and Desorption of Hydrophobic Organic Chemicals (HOCs) by Pakokee Peat Soil
Conference
·
Thu Jul 01 00:00:00 EDT 1999
·
OSTI ID:20014760
Competitive Sorption and Desorption of Chlorinated Organic Solvents (DNAPLs) in Engineered Natural Organic Matter
Conference
·
Tue Mar 30 23:00:00 EST 2004
·
OSTI ID:826035
Effects of Organic Matter Heterogeneity on Sorption and Desorption of Hydrophobic Organic Chemicals (HOCs) by Pakokee Peat Soil
Conference
·
Tue Mar 30 23:00:00 EST 2004
·
OSTI ID:826128