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Reaction Rates For The Dehalogenation Of Trichloroethylene Using Various Types Of Zero Valent Iron
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Book Synopsis Reaction Rates for the Dehalogenation of Trichloroethylene Using Various Types of Zero-valent Iron by : Neil A. Stewart
Download or read book Reaction Rates for the Dehalogenation of Trichloroethylene Using Various Types of Zero-valent Iron written by Neil A. Stewart and published by . This book was released on 2005 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The data obtained produced linear first order rate plots from which dehalogenation rate constants were obtained. The rate constants were normalized by iron mass, solution volume, and surface area. The pretreatment techniques employed in this study, including ultrasonication and acid washing, demonstrated a beneficial effect by removing oxide precipitates from the iron surface, thus increasing the reactivity of the iron. Mass loading studies revealed how physical factors, associated with the experimental setup, could influence reaction rates. Surface area studies confirmed that the smaller iron particles, such as the nanoscale iron, have a greater surface area per unit mass. The large mass and volume normalized rate constant, k[subscript MV], obtained for the nanoscale iron was a result of this high surface area. However, the calculated surface area normalized rate constant, k[subscript SA], for the nanoscale iron was significantly lower than those for the granular iron samples tested. It was concluded that differences in surface area normalized rate constants, between different iron particle types, could be attributed to inherent characteristics of the iron, such as composition and crystal structure.
Book Synopsis Kinetics of Enhanced Dechlorination of Trichloroethylene Using Zero-valent Iron by : Gregory V. Lowry
Download or read book Kinetics of Enhanced Dechlorination of Trichloroethylene Using Zero-valent Iron written by Gregory V. Lowry and published by . This book was released on 1995 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reductive Dehalogenation of Trichloroethylene Using Zero-Valent Iron by : J. Gotpagar
Download or read book Reductive Dehalogenation of Trichloroethylene Using Zero-Valent Iron written by J. Gotpagar and published by . This book was released on 1996 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Model to Characterize the Kinetics of Dechlorination of Tetrachloroethylene and Trichloroethylene By a Zero Valent Iron Permeable Reactive Barrier by : Signe Martha Ulsamer
Download or read book A Model to Characterize the Kinetics of Dechlorination of Tetrachloroethylene and Trichloroethylene By a Zero Valent Iron Permeable Reactive Barrier written by Signe Martha Ulsamer and published by . This book was released on 2011 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A one dimensional, multiple reaction pathway model of the dechlorination reactions of trichloroethylene (TCE) and tetrachloroethylene (PCE) as these species pass through a zero valent iron permeable reactive barrier (PRB) was produced. Three different types of rate equations were tested; first order, surface controlled with interspecies competition, and surface controlled with inter and intra species competition. The first order rate equations predicted the most accurate results when compared to actual data from permeable reactive barriers. Sensitivity analysis shows that the most important variable in determining TCE concentration in the barrier is the first order rate constant for the degradation of TCE. The velocity of the water through the barrier is the second most important variable determining TCE concentration. For PCE the concentration in the barrier is most sensitive to the velocity of the water and to the first order degradation rate constant for the PCE to dichloroacetylene reaction. Overall, zero valent iron barriers are more effective for the treatment of TCE than PCE.
Book Synopsis Trichloroethylene Degradation by Mixed Culture and Zero-valent Iron by : Kaili Qian
Download or read book Trichloroethylene Degradation by Mixed Culture and Zero-valent Iron written by Kaili Qian and published by . This book was released on 2010 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reductive Dehalogenation of Trichloroethylene by Zero-valent Iron and Multiphase Transport Model by : Jayant K. Gotpagar
Download or read book Reductive Dehalogenation of Trichloroethylene by Zero-valent Iron and Multiphase Transport Model written by Jayant K. Gotpagar and published by . This book was released on 1998 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rates of Trichloroethylene Reduction in Passivated Zero-valent Iron Upon Application of Low-level Direct Current by : Mengwen Zhang
Download or read book Rates of Trichloroethylene Reduction in Passivated Zero-valent Iron Upon Application of Low-level Direct Current written by Mengwen Zhang and published by . This book was released on 2014 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Permeable reactive barriers (PRB) containing zero-valent iron (ZVI) have been used for the in situ remediation of groundwater contaminated with trichloroethylene (TCE) for almost two decades; however, ZVI is susceptible to passivation over time, which greatly reduces its treatment efficiency. Several recent studies have suggested that electrically-induced reduction (EIR), the application of low-level direct current, may restore the reactivity of passivated ZVI in situ. In this study, a continuous-flow column reactor was fabricated to treat TCE-contaminated groundwater and assess the effects of low-voltage direct current (0-12 V) on abiotic TCE reduction. In experiments with partially passivated ZVI, application of current increased the rate and the extent of abiotic TCE reduction; both were correlated with voltage. Based on calculated reaction rate coefficients, TCE reduction in passivated ZVI is a first-order reaction. While several mechanisms contribute to the abiotic reduction of TCE in passivated ZVI, they are difficult to isolate experimentally.
Book Synopsis Explorations Into the Mechanism and Kinetics of the Reduction of Trichloroethylene Using Model Complexes of Cobalamin and Zero-valent Iron by : Angela Dee Follett
Download or read book Explorations Into the Mechanism and Kinetics of the Reduction of Trichloroethylene Using Model Complexes of Cobalamin and Zero-valent Iron written by Angela Dee Follett and published by . This book was released on 2006 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanoscale Zerovalent Iron Particles for Environmental Restoration by : Tanapon Phenrat
Download or read book Nanoscale Zerovalent Iron Particles for Environmental Restoration written by Tanapon Phenrat and published by Springer. This book was released on 2019-01-31 with total page 611 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first complete edited volume devoted to providing comprehensive and state-of-the art descriptions of science principles and pilot- and field-scaled engineering applications of nanoscale zerovalent iron particles (NZVI) for soil and groundwater remediation. Although several books on environmental nanotechnology contain chapters of NZVI for environmental remediation (Wiesner and Bottero (2007); Geiger and Carvalho-Knighton (2009); Diallo et al. (2009); Ram et al. (2011)), none of them include a comprehensive treatment of the fundamental and applied aspects of NZVI applications. Most devote a chapter or two discussing a contemporary aspect of NZVI. In addition, environmental nanotechnology has a broad audience including environmental engineers and scientists, geochemists, material scientists, physicists, chemists, biologists, ecologists and toxicologists. None of the current books contain enough background material for such multidisciplinary readers, making it difficult for a graduate student or even an experienced researcher or environmental remediation practitioner new to nanotechnology to catch up with the massive, undigested literature. This prohibits the reader from gaining a complete understanding of NZVI science and technology. In this volume, the sixteen chapters are based on more than two decades of laboratory research and development and field-scaled demonstrations of NZVI implementation. The authors of each chapter are leading researchers and/or practitioners in NZVI technology. This book aims to be an important resource for all levels of audiences, i.e. graduate students, experienced environmental and nanotechnology researchers, and practitioners evaluating environmental remediation, as it is designed to involve everything from basic to advanced concepts.
Book Synopsis Degradation of Trichloroethylene Using Iron, Bimetals and Trimetals by : Wanchun Yuan
Download or read book Degradation of Trichloroethylene Using Iron, Bimetals and Trimetals written by Wanchun Yuan and published by . This book was released on 2000 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: A set of non-chlorinated hydrocarbons consisting Of C3 to C6 alkanes and alkenes was also observed. In the presence of various anions, competition between N03− and TCE was observed for zero-valent iron, bimetals and trimetals, especially when the concentration of N03− was higher than 200 mg/L. In the presence Of S042− and PO43−, there appeared to be an increase in TCE degradation rate using Fe/Cu/Ni but no significant effect using Fe/Ni, Fe/Cu and Fe. The presence Of HC03− did not affect the degradation rates of TCE dechlorination with zero-valent, bimetals and trimetals. Except in the 200 mg/L N03− solution, the degradation of TCE in the HC03−, SO42−, PO43−, and N03− was faster in Fe/Cu/Ni followed by Fe/Ni, Fe/Cu, and Fe. This study indicated that plating copper and nickel onto zero-valent iron will enhance TCE degradation rate constants by approximately one to two orders of magnitude.
Book Synopsis Zero Valent Iron Nanoparticles by : Ruchi Bipinbhai Shah
Download or read book Zero Valent Iron Nanoparticles written by Ruchi Bipinbhai Shah and published by . This book was released on 2008 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dehalogenation written by Max M. Häggblom and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: Halogenated organic compounds constitute one of the largest groups of environmental chemicals. The industrial production of new halogenated organic compounds has increased throughout the last century peaking in the 1960s, and continuing in widespread use today. Organohalides are integral to a variety of industrial applications, including use as solvents, degreasing agents, biocides, pharmaceuticals, plasticizers, hydraulic and heat transfer fluids, and intermediates for chemical synthesis, to name a few. It is important to recognize the beneficial aspects of halogenated organic compounds, as well as their potentially deleterious impact on the environment and health. Recognition ofthe adverse environmental effects ofmanytypes oforganohalide compounds has led to efforts to reduce or eliminate the most problematic ones. Although organohalide compounds are typically considered to be anthropogenic industrial compounds, they have their counterpart in several thousands of natural biogenic and geogenic organohalides, representing most classes of organic chemicals. Natural sources account for a significant portion of the global organohalogen budget. This volume authored by recognized experts in the field provides a current perspective on how both natural and synthetic organohalides are formed and degraded, and how these processes are incorporated into a global halogen cycle. The focus is on microbial processes, since these play a major role both in the production and degradation, i. e. , cycling of halogenated organic compounds inthe environment. This book is organized into five parts. Part I, Introduction, provides a global perspective on the issues of organohalides and their fate in the environment.
Book Synopsis Nanoscale Materials in Water Purification by : Sabu Thomas
Download or read book Nanoscale Materials in Water Purification written by Sabu Thomas and published by Elsevier. This book was released on 2018-11-14 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: Novel nanoscale materials are now an essential part of meeting the current and future needs for clean water, and are at the heart of the development of novel technologies to desalinate water. The unique properties of nanomaterials and their convergence with current treatment technologies present great opportunities to revolutionize water and wastewater treatment. Nanoscale Materials for Water Purification brings together sustainable solutions using novel nanomaterials to alleviate the physical effects of water scarcity. This book covers a wide range of nanomaterials, including noble metal nanoparticles, magnetic nanoparticles, dendrimers, bioactive nanoparticles, polysaccharidebased nanoparticles, nanocatalysts, and redox nanoparticles for water purification. Significant properties and characterization methods of nanomaterials such as surface morphology, mechanical properties, and adsorption capacities are also investigated - Explains how the unique properties of a range of nanomaterials makes them important water purification agents - Shows how the use of nanotechnology can help create cheaper, more reliable, less energy-intensive, more environmentally friendly water purification techniques - Includes case studies to show how nanotechnology has successfully been integrated into water purification system design
Book Synopsis Surface Complexation Modeling by : David A. Dzombak
Download or read book Surface Complexation Modeling written by David A. Dzombak and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a description of the thermodynamic model, data treatment procedures and the thermodynamic constants for hydrous ferric oxide. Includes detailed coverage of the model and the parameter extraction procedure.
Book Synopsis Electrochemical Reduction of Trichloroethylene Using Zero-valent Iron as Cathode Material by : Isaac Amponsah
Download or read book Electrochemical Reduction of Trichloroethylene Using Zero-valent Iron as Cathode Material written by Isaac Amponsah and published by . This book was released on 2004 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluates the effects of external cathodic current on the trichloroethylene (TCE) degradation rate by zero-value iron (ZVI). Sets up a bench scale test and a reactor where electrolytic reduction can take place.
Book Synopsis Evaluation of demonstrated and emerging technologies for the treatment of contaminated land and groundwater (phase III) 1998 special sessiontreatment walls and permeable reactive barriers. by :
Download or read book Evaluation of demonstrated and emerging technologies for the treatment of contaminated land and groundwater (phase III) 1998 special sessiontreatment walls and permeable reactive barriers. written by and published by DIANE Publishing. This book was released on 1998 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Column Studies to Determine the Effects of PH on the Dechlorination of Trichloroethene by Zero-valent Iron by : Christopher Warren Lewter
Download or read book Column Studies to Determine the Effects of PH on the Dechlorination of Trichloroethene by Zero-valent Iron written by Christopher Warren Lewter and published by . This book was released on 2002 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Performs column studies to determine the effects of pH and EDTA (ethylenediaminetetraacetic acid) concentration on the degradation of TCE (trichloroethene) by ZVI (zero-valent iron). The aim of the study is to provide additional kinetic data for more efficient methods of using ZVI for the remediation of TCE-contaminated groundwaters.
