In Situ Chemical Oxidation for Groundwater Remediation

Siegrist, Robert L.; Crimi, Michelle; Simpkin, Thomas J.

doi:10.1007/978-1-4419-7826-4

Cited by 162 publications

(29 citation statements)

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“…Heterogeneous catalytic conversion of pollutants can also be established with large variety of peroxides [13,[130][131][132][133] and iron in various valence states [134][135][136][137]. In the case of peroxides, the main aim of the catalytic activation is to weaken the O-O bond of the oxidizing agent [13,138].…”

Section: Water / Wastewater / Soilmentioning

confidence: 99%

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Wacławek

Padil

Černík

2018

Ecological Chemistry and Engineering S

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Heterogeneous catalysis is one of the fastest developing branches of chemistry. Moreover, it is strongly connected to popular environment-related applications. Owing to the very fast changes in this field, for example, numerous discoveries in nanoscience and nanotechnologies, it is believed that an update of the literature on heterogeneous catalysis could be beneficial. This review not only covers the new developments of heterogeneous catalysis in environmental sciences but also touches its historical aspects. A short introduction to the mechanism of heterogeneous catalysis with a small section on advances in this field has also been elaborated. In the first part, recent innovations in the field of catalytic air, water, wastewater and soil treatment are presented, whereas in the second part, innovations in the use of heterogeneous catalysis for obtaining sustainable energy and chemicals are discussed. Catalytic processes are ubiquitous in all branches of chemistry and there are still many unsolved issues concerning them.

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Section: Water / Wastewater / Soilmentioning

confidence: 99%

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Wacławek

Padil

Černík

2018

Ecological Chemistry and Engineering S

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“…El H2O2 tiene un alto potencial normal de reducción (E°= 1.776 V a 25.0°C [7]) por lo que en principio es capaz de oxidar a la mayoría de los xenobióticos. No obstante la oxidación directa con H2O2 es muy lenta [7] y es necesario utilizar algún proceso de activación tal como el uso de un catalizador (inorgánico o biológico) y/o de alguna fuente de energía (lumínica, ultrasonido, eléctrica). La gran variedad de combinaciones de catalizadores y fuentes de energía es lo que da origen a los diversos tratamientos posibles.…”

Section: Oxidación Con Peróxido De Hidrógenounclassified

“…La reacción de Fenton consiste en la reacción de Fe(II) con H2O2 para generar radicales OH • , especie muy oxidante (E° = 2.59 V a 25.0 °C [7]) que ataca de manera poco selectiva a los compuestos orgánicos con constantes de velocidad del orden difusional (10 8 -10 10 M -1 .s -1 ).…”

Section: Reacciones Fenton Y Tipo Fentonunclassified

“…Está ampliamente probado que los radicales OH • son los principales oxidantes en los procesos Tipo-Fenton en medio ácido. No obstante se discute el posible rol de otros oxidantes, como especies de hierro en alto estado de oxidación (principalmente FeO 2+ ) a pH neutros o básicos [7]. Cualquiera sea la especie involucrada, los contaminantes aromáticos son oxidados en forma secuencial, generando primero intermediarios quinónicos que son luego convertidos en ácidos orgánicos alifáticos y, en las condiciones adecuadas, a sustancias inorgánicas tales como CO2 y H2O.…”

Section: Reacciónunclassified

“…La reacción de Fenton es eficiente como técnica de degradación en un rango amplio de pH, aunque normalmente se considera que posee un pH óptimo de 2.8, ya que a valores mayores la formación de compuestos hidroxilados de Fe(II) desfavorecen la reacción [7]. Normalmente un aumento en las concentraciones de los reactivos involucrados provoca un aumento en la velocidad de la generación de radicales y, por lo tanto, en la velocidad de degradación.…”

Section: Ii)unclassified

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Sistemas basados en el empleo de peróxido de hidrógeno para el tratamiento de efluentes textiles

Donadelli¹

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En esta tesis se estudió la oxidación de colorantes con peróxido de hidrógeno utilizando dos estrategias de activación: el agregado de hierro metálico (Fenton asistido por ZVI) y el uso de peroxidasa de soja inmovilizada en nanomateriales magnéticos. En el caso de la Fenton asistida por ZVI se realizó un estudio minucioso de los procesos fisicoquímicos involucrados mediante ensayos en batch. Se encontró la coexistencia de dos vías de remoción (oxidativa y reductiva) cuyo peso relativo era dependiente de las condiciones operativas. Con los conocimientos generados se realizó un diseño racional de un reactor continuo capaz de funcionar a pH cercanos a la neutralidad. En el estudio de la peroxidasa inmovilizada se utilizaron soportes a base de maghemita con distintos recubrimientos de sílice, encontrándose un efecto protector de los recubrimientos sobre la actividad de la enzima.

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High‐resolution experiments on chemical oxidation of DNAPL in variable‐aperture fractures

Arshadi

Rajaram

Detwiler

et al. 2015

Water Resources Research

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Chemical oxidation of dense nonaqueous-phase liquids (DNAPLs) by permanganate has emerged as an effective remediation strategy in fractured rock. We present high-resolution experimental investigations in transparent analog variable-aperture fractures to improve understanding of chemical oxidation of residual entrapped trichloroethylene (TCE) in fractures. Four experiments were performed with different permanganate concentrations, flow rates, and initial TCE phase geometry. The initial aperture field and evolving entrapped-phase geometry were quantified for each experiment. The integrated mass transfer rate from the TCE phase for all experiments exhibited three time regimes: an early-time regime with slower mass transfer rates limited by low specific interfacial area; an intermediate-time regime with higher mass transfer rates resulting from breakup of large TCE blobs, which greatly increases specific interfacial area; and a late-time regime with low mass transfer rates due to the deposition of MnO 2 precipitates. In two experiments, mass balance analyses suggested that TCE mass removal rates exceeded the maximum upper bound mass removal rates derived by assuming that oxidation and dissolution are the only mechanisms for TCE mass removal. We propose incomplete oxidation by permanganate and TCE solubility enhancement by intermediate reaction products as potential mechanisms to explain this behavior. We also speculate that some intermediate reaction products with surfactant-like properties may play a role in lowering the TCEwater interfacial tension, thus causing breakup of large TCE blobs. Our quantitative experimental measurements will be useful in the context of developing accurate computational models for chemical oxidation of TCE in fractures.

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In Situ Chemical Oxidation for Groundwater Remediation

Cited by 162 publications

References 0 publications

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Major Advances and Challenges in Heterogeneous Catalysis for Environmental Applications: A Review

Sistemas basados en el empleo de peróxido de hidrógeno para el tratamiento de efluentes textiles

High‐resolution experiments on chemical oxidation of DNAPL in variable‐aperture fractures

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