Journal ArticleDOI
Reactions of Ferrate(VI) with Iodide and Hypoiodous Acid: Kinetics, Pathways, and Implications for the Fate of Iodine during Water Treatment
Jaedon Shin,Jaedon Shin,Urs von Gunten,Urs von Gunten,David A. Reckhow,Sebastien Allard,Yunho Lee +6 more
TLDR
Overall, due to a rapid oxidation of I- to IO3- with short-lifetimes of HOI, ferrate(VI) oxidation appears to be a promising option for I-DBP mitigation during treatment of I--containing waters.Abstract:
Oxidative treatment of iodide-containing waters can form toxic iodinated disinfection byproducts (I-DBPs). To better understand the fate of iodine, kinetics, products, and stoichiometries for the reactions of ferrate(VI) with iodide (I–) and hypoiodous acid (HOI) were determined. Ferrate(VI) showed considerable reactivities to both I– and HOI with higher reactivities at lower pH. Interestingly, the reaction of ferrate(VI) with HOI (k = 6.0 × 103 M–1 s–1 at pH 9) was much faster than with I– (k = 5.6 × 102 M–1 s–1 at pH 9). The main reaction pathway during treatment of I–-containing waters was the oxidation of I– to HOI and its further oxidation to IO3– by ferrate(VI). However, for pH > 9, the HOI disproportionation catalyzed by ferrate(VI) became an additional transformation pathway forming I– and IO3–. The reduction of HOI by hydrogen peroxide, the latter being produced from ferrate(VI) decomposition, also contributes to the I– regeneration in the pH range 9–11. A kinetic model was developed that could w...read more
Citations
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Journal ArticleDOI
Role of Ferrate(IV) and Ferrate(V) in Activating Ferrate(VI) by Calcium Sulfite for Enhanced Oxidation of Organic Contaminants
TL;DR: The Fe(VI)-CaSO3 process with Fe(IV)/Fe(V) as reactive oxidants may be a promising method for abating various micropollutants in water treatment.
Journal ArticleDOI
Enhanced Oxidation of Organic Contaminants by Iron(II)-Activated Periodate: The Significance of High-Valent Iron-Oxo Species.
TL;DR: In this article, the authors proposed an efficient and environmental friendly process for the rapid removal of emerging contaminants and enriched the understandings on the evolution mechanism of ·OH in Fe(IV)-mediated processes.
Journal ArticleDOI
Accelerated Oxidation of Organic Contaminants by Ferrate(VI): The Overlooked Role of Reducing Additives
TL;DR: FeV and FeIV as the oxidative species in the FeVI--contaminant system are elucidated by determining removal of contaminants in oxygenated and deoxygenated water, applying probing agent, and identifying oxidized products of TMP and sulfadimethoxine (SDM) by FeVI-S2O32- systems.
Journal ArticleDOI
Formation of Iodinated Disinfection Byproducts (I-DBPs) in Drinking Water: Emerging Concerns and Current Issues
TL;DR: The state-of-the-art understanding of known I-DBPs for the six groups reported to date is presented, including iodinated methanes, acids, acetamides, acetonitriles, acetaldehyde, and phenols, which helps drinking water utilities, researchers, regulators, and the general public understand the formed species, levels, and formation mechanisms.
Journal ArticleDOI
Production of Reactive Oxygen Species by the Reaction of Periodate and Hydroxylamine for Rapid Removal of Organic Pollutants and Waterborne Bacteria
TL;DR: A simple and highly efficient option of PI activation and ROS production which might find useful applications where urgent and rapid removal of toxic pollutants is needed is offered.
References
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Journal ArticleDOI
Occurrence of a New Generation of Disinfection Byproducts
Stuart W. Krasner,Howard S. Weinberg,Susan D. Richardson,Salvador J. Pastor,Russell Chinn,Michael J. Sclimenti,Gretchen D. Onstad,Alfred D. Thruston +7 more
TL;DR: A survey of disinfection byproduct (DBP) occurrence in the United States was conducted at 12 drinking water treatment plants to obtain quantitative occurrence information for new DBPs (beyond those currently regulated and/or studied) for prioritizing future health effects studies.
Journal ArticleDOI
Decomposition of ozone in water: rate of initiation by hydroxide ions and hydrogen peroxide
Johannes Staehelin,Juerg. Hoigne +1 more
Journal ArticleDOI
Oxidative transformation of micropollutants during municipal wastewater treatment: Comparison of kinetic aspects of selective (chlorine, chlorine dioxide, ferrateVI, and ozone) and non-selective oxidants (hydroxyl radical)
TL;DR: For a given oxidant dose, the selective oxidants were more efficient than hydroxyl radicals for transforming ERMs-containing micropollutants, while hydroxy radicals are capable of transforming micropolutants even without ERMs.
Journal ArticleDOI
Comparison of disinfection byproduct formation from chlorine and alternative disinfectants
Guanghui Hua,David A. Reckhow +1 more
TL;DR: Results showed that preozonation decreased the formation of trihalomethanes, haloacetic acids (HAAs) and total organic halogen (TOX) for most waters during postchlorination, while a net increase in THMs, HAAs and TOX was observed for a water of low humic content.
Journal ArticleDOI
Occurrence and mammalian cell toxicity of iodinated disinfection byproducts in drinking water.
Susan D. Richardson,Francesca Fasano,J. Jackson Ellington,F. Gene Crumley,Katherine M. Buettner,John J. Evans,Benjamin C. Blount,Lalith K. Silva,Tim J. Waite,George W. Luther,A. Bruce McKague,Richard J. Miltner,Elizabeth D. Wagner,Michael J. Plewa +13 more
TL;DR: In general, compounds that contain an iodo-group have enhanced mammalian cell cytotoxicity and genotoxicity as compared to their brominated and chlorinated analogues.