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Title: Slow Desorption of Phenanthrene from Silica Particles: Influence of Pore Size, Pore Water, and Aging Time

Abstract

When micro-porous and meso-porous silica particles were exposed to aqueous phenanthrene solutions for various durations it was observed that sorbed-phase phenanthrene concentrations increased with aging time only for meso-porous but not micro-porous silicas. Desorption equilibrium was reached almost instantaneously for the micro-porous particles while both the rate and extent of desorption decreased with increasing aging time for the meso-porous silicas. These findings indicate that phenanthrene can be sequestered within the internal pore-space of meso-porous silicas while the internal surfaces of micro-porous silicas are not accessible to phenanthrene sorption, possibly due to the presence of physi- or chemi-sorbed water that may sterically hinder the diffusion of phenanthrene inside water-filled micro-pores. By contrast, the internal surfaces of these micro-porous silicas are accessible to phenanthrene when aging methods are employed which assure that pores are devoid of physi-sorbed water. Consequently, when phenanthrene was incorporated into these particles using either supercritical CO2 or via solvent soaking, the aqueous desorption kinetics were extremely slow indicating effective sequestration of phenanthrene inside micro-porous particles. Finally, a two-compartment conceptual model is used to interpret the experimental findings.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
881324
Report Number(s):
PNNL-SA-48083
KP1301010; TRN: US200612%%806
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: 20th Annual International Conference on Soils, Sediments, and Water: Successes and Challenges published in CONTAMINATED SOILS SEDIMENTS AND WATER, 2006, 10(1-24
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AGING; DESORPTION; DIFFUSION; KINETICS; PHENANTHRENE; SEDIMENTS; SILICA; SOILS; SOLVENTS; SORPTION; WATER; Aging; Sequestration; Phenanthrene; Sorption

Citation Formats

Huesemann, Michael H., Fortman, Timothy J., Riley, Robert G., Thompson, Christopher J., Wang, Zheming, Truex, Michael J., and Peyton, Brent M. Slow Desorption of Phenanthrene from Silica Particles: Influence of Pore Size, Pore Water, and Aging Time. United States: N. p., 2006. Web.
Huesemann, Michael H., Fortman, Timothy J., Riley, Robert G., Thompson, Christopher J., Wang, Zheming, Truex, Michael J., & Peyton, Brent M. Slow Desorption of Phenanthrene from Silica Particles: Influence of Pore Size, Pore Water, and Aging Time. United States.
Huesemann, Michael H., Fortman, Timothy J., Riley, Robert G., Thompson, Christopher J., Wang, Zheming, Truex, Michael J., and Peyton, Brent M. Mon . "Slow Desorption of Phenanthrene from Silica Particles: Influence of Pore Size, Pore Water, and Aging Time". United States. doi:.
@article{osti_881324,
title = {Slow Desorption of Phenanthrene from Silica Particles: Influence of Pore Size, Pore Water, and Aging Time},
author = {Huesemann, Michael H. and Fortman, Timothy J. and Riley, Robert G. and Thompson, Christopher J. and Wang, Zheming and Truex, Michael J. and Peyton, Brent M.},
abstractNote = {When micro-porous and meso-porous silica particles were exposed to aqueous phenanthrene solutions for various durations it was observed that sorbed-phase phenanthrene concentrations increased with aging time only for meso-porous but not micro-porous silicas. Desorption equilibrium was reached almost instantaneously for the micro-porous particles while both the rate and extent of desorption decreased with increasing aging time for the meso-porous silicas. These findings indicate that phenanthrene can be sequestered within the internal pore-space of meso-porous silicas while the internal surfaces of micro-porous silicas are not accessible to phenanthrene sorption, possibly due to the presence of physi- or chemi-sorbed water that may sterically hinder the diffusion of phenanthrene inside water-filled micro-pores. By contrast, the internal surfaces of these micro-porous silicas are accessible to phenanthrene when aging methods are employed which assure that pores are devoid of physi-sorbed water. Consequently, when phenanthrene was incorporated into these particles using either supercritical CO2 or via solvent soaking, the aqueous desorption kinetics were extremely slow indicating effective sequestration of phenanthrene inside micro-porous particles. Finally, a two-compartment conceptual model is used to interpret the experimental findings.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 16 00:00:00 EST 2006},
month = {Mon Jan 16 00:00:00 EST 2006}
}

Conference:
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