Cart
Article
Mass Transport Effects on the Kinetics of Nitrobenzene Reduction by Iron Metal
Full Text HTML
Hi-Res PDFPurchase the full-text
- PDF/HTML,
figures/images,
references and tables,
(where available)
Section:Abstract
To evaluate the importance of external mass transport on the overall rates of contaminant reduction by iron metal (Fe0), we have compared measured rates of surface reaction for nitrobenzene (ArNO2) to estimated rates of external mass transport in a permeable reactive barrier (PRB). The rate of surface reaction was measured at a polished Fe0 rotating disk electrode (RDE) in an electrochemical cell, and the rate of mass transport was estimated from a correlation for mass transport in packed-bed reactors. The kinetics of ArNO2 reduction were studied in pH 8.4 borate buffer at a potential below which an oxide film would form. The cathodic current measured in this system was dependent on the electrode rotation rate, and the measured first-order heterogeneous rate coefficient for surface reaction [krxn = (1.7 ± 0.2) × 10-3 cm s-1] was about 10 times faster than the first-order mass transport rate coefficient (kmt ≈ 2 × 10-4 cm s-1) estimated for PRBs. The similarity between rates of surface reaction and mass transport suggest that it may be important to consider mass transport processes in the design of PRBs for contaminants such as nitroaromatics that are highly reactive with Fe0.
Citing Articles
Citation data is made available by participants in CrossRef's Cited-by Linking service. For a more comprehensive list of citations to this article, users are encouraged to perform a search in SciFinder.
This article has been cited by 13 ACS Journal articles (5 most recent appear below).
Degradation of 1,2,3-Trichloropropane (TCP): Hydrolysis, Elimination, and Reduction by Iron and Zinc
Vaishnavi Sarathy, Alexandra J. Salter, James T. Nurmi, Graham O’Brien Johnson, Richard L. Johnson and Paul G. TratnyekEnvironmental Science & Technology2010 44 (2), 787-793Degradation of 1,2,3-Trichloropropane (TCP): Hydrolysis, Elimination, and Reduction by Iron and Zinc
Vaishnavi Sarathy, Alexandra J. Salter, James T. Nurmi, Graham O’Brien Johnson, Richard L. Johnson and Paul G. TratnyekEnvironmental Science & Technology2010 44 (2), 787-7931,2,3-Trichloropropane (TCP) is an emerging contaminant because of increased recognition of its occurrence in groundwater, potential carcinogenicity, and resistance to natural attenuation. The physical and chemical properties of TCP make it difficult to ...
Environmental Applications of Zerovalent Metals: Iron vs. Zinc
Paul G. TratnyekAlexandra J. SalterJames T. NurmiVaishnavi Sarathy2010 1045 (), 165-178Environmental Applications of Zerovalent Metals: Iron vs. Zinc
Paul G. TratnyekAlexandra J. SalterJames T. NurmiVaishnavi Sarathy2010 1045 (), 165-178The reactivity of particulate zero-valent metals in solution is affected by the metal type (e.g., Fe vs. Zn), particle size (nano vs. micro), surface conditions (passivation by coatings of oxides), and solution conditions (including the type and ...
Electronic Structure and Bonding of {Fe(PhNO2)}6 Complexes: A Density Functional Theory Study
Olexandr Isayev, Leonid Gorb, Igor Zilberberg, and Jerzy LeszczynskiThe Journal of Physical Chemistry A2007 111 (18), 3571-3576Electronic Structure and Bonding of {Fe(PhNO2)}6 Complexes: A Density Functional Theory Study
Olexandr Isayev, Leonid Gorb, Igor Zilberberg, and Jerzy LeszczynskiThe Journal of Physical Chemistry A2007 111 (18), 3571-3576Reduction of nitro-aromatic compounds (NACs) proceeds through intermediates with a partial electron transfer into the nitro group from a reducing agent. To estimate the extent of such a transfer and, therefore, the activity of various model ferrous-...
Kinetics and Mechanisms of Radiolytic Degradation of Nitrobenzene in Aqueous Solutions
Shu-Juan Zhang, Hong Jiang, Min-Jie Li, Han-Qing Yu, Hao Yin, and Qian-Rong LiEnvironmental Science & Technology2007 41 (6), 1977-1982Kinetics and Mechanisms of Radiolytic Degradation of Nitrobenzene in Aqueous Solutions
Shu-Juan Zhang, Hong Jiang, Min-Jie Li, Han-Qing Yu, Hao Yin, and Qian-Rong LiEnvironmental Science & Technology2007 41 (6), 1977-1982Steady-state radiolysis experiments were performed to gain insight into the kinetics and mechanisms of nitrobenzene (NB) degradation in aqueous solutions. The degradation of NB under γ-ray irradiation followed pseudo-first-order kinetics, and the pseudo ...
Characterization and Properties of Metallic Iron Nanoparticles: Spectroscopy, Electrochemistry, and Kinetics
James T. Nurmi, Paul G. Tratnyek, Vaishnavi Sarathy, Donald R. Baer, James E. Amonette, Klaus Pecher, Chongmin Wang, John C. Linehan, Dean W. Matson, R. Lee Penn, and Michelle D. DriessenEnvironmental Science & Technology2005 39 (5), 1221-1230Characterization and Properties of Metallic Iron Nanoparticles: Spectroscopy, Electrochemistry, and Kinetics
James T. Nurmi, Paul G. Tratnyek, Vaishnavi Sarathy, Donald R. Baer, James E. Amonette, Klaus Pecher, Chongmin Wang, John C. Linehan, Dean W. Matson, R. Lee Penn, and Michelle D. DriessenEnvironmental Science & Technology2005 39 (5), 1221-1230There are reports that nano-sized zero-valent iron (Fe0) exhibits greater reactivity than micro-sized particles of Fe0, and it has been suggested that the higher reactivity of nano-Fe0 may impart advantages for groundwater remediation or other ...
Tools
-
Add to Favorites
-
Download Citation
-
Email a Colleague -
Permalink
Order Reprints
Rights & Permissions
Citation Alerts
History
- Published In Issue July 01, 2001
- Received for review September 20, 2000
Revised manuscript received April 6, 2001
Accepted April 6, 2001
ACS
Network
Facebook
Tweet This
CiteULike
Newsvine
Digg This
Delicious
