Title
Ultrasound pretreatment of elemental iron: kinetic studies of dehalogenation reaction enhancement and surface effects
Abbreviated Journal Title
Water Res.
Keywords
trichloroethylene; iron; ultrasound; groundwater remediation; ZERO-VALENT IRON; AQUEOUS-SOLUTION; TRICHLOROETHYLENE; DEGRADATION; METALS; Engineering, Environmental; Environmental Sciences; Water Resources
Abstract
This work presents data showing the kinetic improvement afforded by ultrasound pretreatment and illustrates the physical and chemical changes that take place at the iron surface. First-order rate constants improved as much as 78% with 2h of ultrasound pretreatment. Scanning electron microscopy (SEM) and surface area analysis were used for confirmation of the physical changes that take place after ultrasound was used on iron surfaces exposed to a variety of conditions. X-ray photoelectron spectroscopy was used to determine chemical surface characteristics before and after ultrasound use. SEM and surface area analysis showed that ultrasound use clears the iron surface of debris increasing the surface area up to 169%. In addition, exposure to ultrasound alters ratios of surface species, such as adventitious carbon to carbonyl carbon and iron to oxygen, and removed hydroxides thus making the iron more reactive to reductive dehalogenation. (C) 2002 Elsevier Science Ltd. All rights reserved.
Journal Title
Water Research
Volume
36
Issue/Number
5
Publication Date
1-1-2002
Document Type
Article
Language
English
First Page
1342
Last Page
1350
WOS Identifier
ISSN
0043-1354
Recommended Citation
"Ultrasound pretreatment of elemental iron: kinetic studies of dehalogenation reaction enhancement and surface effects" (2002). Faculty Bibliography 2000s. 3213.
https://stars.library.ucf.edu/facultybib2000/3213