Regeneration of 4-Nitrophenol - Adsorbed Activated Carbon by Fenton's Reagent PDF Download

Author: Chalermchai Ruangchainikom
Publisher:
ISBN: 9789741721573
Category :
Languages : en
Pages : 150

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Author: Carla De Las Casas
Publisher:
ISBN:
Category :
Languages : en
Pages : 430

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Book Description
Fenton-dependent recovery of carbon initially saturated with one of several chlorinated aliphatic contaminants was studied in batch and continuous-flow reactors. A specialty carbon, URV-MOD 1 (Calgon) was employed to minimize non-productive H2O2 demand - that which does not yield hydroxyl or superoxide radicals. Enhancement of PCE degradation kinetics by ferric iron addition is limited by iron solubility, even at relatively low pH. Quinone addition increased the pseudo-first-order rate constant for PCE loss temporarily. Only copper addition sustainably enhanced the specific rate of PCE loss. For copper-to-iron molar ratios of 0.25 to 5, the pseudo-first-order rate constant for PCE transformation was increased by a factor of 3.5. It is apparent that the effect of copper addition on Fenton-dependent reaction rates is complex, and involves a shift in chemical mechanism, as indicated by the differing slopes in the Arrhenius plot (with and without copper).A mathematical model was developed to evaluate the effect of operational parameters ([Fe(III)]T:[H2O2]o ratio and pH) on degradation kinetics and optimize the PCE degradation process in homogeneous reaction mixtures. The model simulated experimental degradation of the organic target in a homogeneous Fenton-reaction system. The model requires further refinement to simulate Fenton's systems in which ions in solution (such as sulfate and chloride) play significant roles. In continuous-flow reactors, Fenton's reagents were cycled through spent GAC in columns to degrade one of seven chlorinated compounds tested. The contaminant with the weakest adsorption characteristics, methylene chloride, was 99% lost from the carbon surface during a 14-hour regeneration period. At the field site, the GAC was saturated with gases containing TCE and PCE from a soil vapor extraction (SVE) system. In the field, up to 95% of the sorbed TCE was removed from GAC during regeneration periods of 50-60 hours. Recovery of PCE-loaded GAC was significantly slower. Column experiments show that there is minimal loss of carbon adsorption capacity during Fenton treatment and that the rate of GAC regeneration is compound specific. Scoping-level cost estimates indicated that field use of Fenton regeneration is not cost effective without optimization and/or iron surface amendments, except in the case of the most soluble VOCs.

Author: Lucas Meili
Publisher: Springer Nature
ISBN: 3030640922
Category : Science
Languages : en
Pages : 501

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This book compiles 15 chapters about the synthesis, characterizations, and application of many kinds of magnetic adsorbents for water treatment. It is devoted to the scientific community that works with adsorption technologies for water treatment and remediation. Specifically, for professors and Ph.D. students. It is expected that this book serves as an interesting background for researchers in the field of magnetic adsorbents for water treatment.

Author: Louis Hemphill
Publisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 120

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Author: Patrick Kyle Jones
Publisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 124

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Author: John S. Zogorski
Publisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 686

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Author: Ali Mansoor Ali Amir
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 186

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Author: D. Russell
Publisher: The Electrochemical Society
ISBN: 1566777011
Category : Science
Languages : en
Pages : 31

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The papers included in this issue of ECS Transactions were originally presented in the symposium ¿Environmental Electrochemistry¿, held during the PRiME 2008 joint international meeting of The Electrochemical Society and The Electrochemical Society of Japan, with the technical cosponsorship of the Japan Society of Applied Physics, the Korean Electrochemical Society, the Electrochemistry Division of the Royal Australian Chemical Institute, and the Chinese Society of Electrochemistry. This meeting was held in Honolulu, Hawaii, from October 12 to 17, 2008.

Author: Robert G. Arnold
Publisher:
ISBN:
Category : Carbon
Languages : en
Pages : 143

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Book Description
Fenton-dependent recovery o fcarbon initially saturated with one of several chlorinated aliphatic contaminants was studied in batch and continuous-flow reactors. A specialty carbon, URV-MOD 1 (Calgon) was employed to minimize non-productive H2O2 demand - that which does not yield hydroxyl or superoxide radicals. Because the reductive reaction of Fe(III) to Fe(II) limits the overall rate of radical generation via Fenton's mechanism, it was hypothesized that steps designed to increase the rate of ferrous iron generation would accelerate Fenton-dependent contaminant destruction, enhancing carbon recovery kinetics. Homogeneous-phase experiments were designed to establish the effects on PCE destruction kinetics of total iron concentration and additions of NH2OH, various quinones or copper to the Fenton mixtures.

Author: Francois Beguin
Publisher: CRC Press
ISBN: 1420055402
Category : Science
Languages : en
Pages : 532

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Book Description
As carbons are widely used in energy storage and conversion systems, there is a rapidly growing need for an updated book that describes their physical, chemical, and electrochemical properties. Edited by those responsible for initiating the most progressive conference on Carbon for Energy Storage and Environment Protection (CESEP), this book undoub