Papers by Fernando Sebastián García Einschlag
Chemical Engineering Journal, Feb 1, 2023
Journal of Photochemistry and Photobiology A-chemistry, Nov 1, 2022
Encuentro de Becarios de la UNLP (EBEC) (La Plata, 2018), 2019
CRC Press eBooks, Apr 10, 2014
Catalysts, Jan 10, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Journal of Photochemistry and Photobiology B: Biology
Science of The Total Environment, 2019
An overview about the presence of arsenic (As) in groundwaters of Argentina, made by a transdisci... more An overview about the presence of arsenic (As) in groundwaters of Argentina, made by a transdisciplinary group of experts is presented. In this second part, the conventional and emerging technologies for As removal, management of wastes, and the initial investment costs of the proposed technologies, with emphasis on developments of local groups are described. Successful examples of real application of conventional and emerging technologies for As removal in waters for human consumption, for medium, small and rural and periurban communities are reported. In the country, the two most applied technologies for arsenic removal at a real scale are reverse osmosis and coagulation-adsorption-filtration processes using iron or aluminum salts or polyelectrolytes as coagulants. A decision tree to evaluate the possible technologies to be applied, based on the population size, the quality of the water and its intended use, is presented, including preliminary and indicative investment costs. Finally, a section discussing the treatment and final disposal of the liquid, semiliquid and solid wastes, generated by the application of the most used technologies, is included. Conclusions and recommendations, especially for isolated rural and periurban regions, have been added.
Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology, Jun 13, 2018
Correction for 'Humic-like substances from urban waste as auxiliaries for photo-Fenton treatm... more Correction for 'Humic-like substances from urban waste as auxiliaries for photo-Fenton treatment: a fluorescence EEM-PARAFAC study' by S. García Ballesteros et al., Photochem. Photobiol. Sci., 2017, 16, 38-45.
Environmental Photochemistry Part III, 2013
Among Advanced Oxidation Processes (AOPs), the Fenton process and the photochemically enhanced or... more Among Advanced Oxidation Processes (AOPs), the Fenton process and the photochemically enhanced or assisted Fenton process, commonly called photo-Fenton, are considered to be among the most efficient for the oxidative degradation of a large variety of organic contaminants in aqueous systems. These processes, based on the generation of highly oxidizing species (hydroxyl radicals and possibly others) from hydrogen peroxide and Fe ions, may be counted among the few methods that are actually applied on a technical scale for an abiotic (pre-)treatment of wastewaters. With close to 5,000 articles published on this topic during the last decade, covering both fundamental aspects and applications, this chapter is restricted to a selective overview of the photo-Fenton process applied to water treatment. It briefly recalls the fundamentals of the Fenton reaction, describes the main lines of research for process enhancement and economic feasibility, summarizes the essentials determining the primary process parameters, and discusses the present state of technical development and its priorities.
Journal of Molecular Catalysis A: Chemical, 2012
Phenolic compounds removal is a very active research field due to occurrence and the toxicity of ... more Phenolic compounds removal is a very active research field due to occurrence and the toxicity of phenolic pollutants in industrial wastewaters. In order to make an a priori selection of the most efficient removal process for a target structure this contribution reviews and compares some of the mechanistic aspects of the oxidation in the presence of hydrogen peroxide and catalyzed by complexed iron which is the in-common element in Fenton systems, plant peroxidases and biomimetics. Different substrates were considered from the most basic phenol molecule to complex structures such as phenolic dyes and lignins. The reactivity of iron is related to its microenvironment generated by ligands and their electron withdrawing capacity thus conditioning the type of cleavage induced on hydrogen peroxide and the oxidation state change on iron upon reaction. The relative concentrations of organic to inorganic free radicals generated control the main catalytic action; i.e. from degradation up to mineralization in Fenton systems or oligomerization up to polymerization in plant peroxidases systems. Moreover, some reaction conditions as the peroxide concentration, the initial molar ratio of organic compounds to peroxide and the type of reaction solvent are identified as key factors to promote a desired action mechanism by peroxidases (and their biomimetics).
Chemical Engineering Journal, 2009
Owing to newly established water quality standards, the use of the zero-valent iron (ZVI) method ... more Owing to newly established water quality standards, the use of the zero-valent iron (ZVI) method for arsenic removal is gaining attention. The spontaneous chemical oxidation of ZVI by dissolved oxygen, a complex process involving a variety of metastable ferrous-ferric intermediate species, was studied in short-term batch experiments using two different commercially available ZVI materials. Differences in corrosion rates may be attributed to the different specific reactivity of these materials. The effects of pH, ZVI loading, initial conductivity and dissolved oxygen concentration on both Fe(II) and Fe(III) kinetic profiles were investigated. ZVI corrosion rates in the presence of As(III) and As(V) were also studied. Depending on the pH, the concentrations of Fe(II) and Fe(III) are significantly influenced by the presence of As(III) and As(V). Our results may be important from a technological point of view, since it is well known that iron corrosion rates govern the generation of sites for arsenic removal.
Chemical Engineering Journal, 2017
An iron-based photochemical process able to act via reductive and oxidative phases by tuning expe... more An iron-based photochemical process able to act via reductive and oxidative phases by tuning experimental conditions has been explored. In a first step, zero-valent iron (ZVI), added as steel wool, was used to reduce those pollutants reluctant to oxidative processes in an illuminated reservoir. Then, the iron released in the solution was employed, upon addition of hydrogen peroxide, to drive a photo-Fenton process. This procedure has been checked with a mixture of five chemicals, namely p-toluensulfonic acid, benzoic acid, pnitrobenzoic acid, acetaminophen and caffeic. p-nitrobenzoic acid resulted to be the most reluctant against oxidation but it was reduced in the absence of H2O2 to form 4aminobenzoic acid; the presence of salts (e.g. tap water) was required and best results were reached at neutral pH. As p-aminobenzoic acid can be more easily oxidized than pnitrobenzoic, combination of both phases is meaningful: a ZVI-based reduction followed by a photo-Fenton like-oxidation was employed to remove this pollutant from tested solutions.
CRC Press eBooks, Feb 24, 2023
International Journal of Energy and Water Resources, 2019
Phenol degradation experiments were performed to study the potential behavior of the acidic Lake ... more Phenol degradation experiments were performed to study the potential behavior of the acidic Lake Caviahue (LC) as a dark Fenton reactor under natural conditions and upon H 2 O 2 addition at doses typically used for technological applications. In both cases, to assess the influence of dissolved organic matter present in the lake, control experiments were carried out under identical initial conditions (pH, concentrations of phenol, iron, and H 2 O 2), but in the absence of organic matter. A first set of experiments was performed to test the feasibility of dark Fenton processes under environmental conditions. Lake water samples were used as reaction matrix and catalyst source, whereas phenol and H 2 O 2 were added as model pollutant and oxidant, respectively. H 2 O 2 concentrations used were similar to those reported for rainwater. Results show that phenol can be degraded under all conditions studied and that the amount of phenol consumed depends on both the H 2 O 2 concentration added and the matrix composition LC A second set of experiments was designed to characterize the lake behavior as a natural Fenton reactor upon the addition of H 2 O 2 concentrations typically used for technological applications. Although phenol concentration profiles obtained for LC and the artificial solution show the characteristic behavior of Fenton-like systems, the trends are rather different, since for LC, the lag phase is much longer than that for the artificial matrix. Overall, the results suggest that the Fe(III)-chelating effect of the organic matter present in LC slows down reaction rates, but it does not block phenol degradation through Fenton-like processes.
Reaction Chemistry & Engineering
Efficient lignin degradation was achieved by dark cupro-Fenton treatment. Optimal conditions were... more Efficient lignin degradation was achieved by dark cupro-Fenton treatment. Optimal conditions were assessed by using OED and SRM. Kinetic profiles obtained by MCR-ALS decomposition of UV-vis spectra allowed the development of a lumped kinetic model.
En los sistemas tipo-Fenton el pH del medio juega un rol muy importante debido a que por encima d... more En los sistemas tipo-Fenton el pH del medio juega un rol muy importante debido a que por encima de pH ~ 3.2 la solubilidad del Fe(III)aq decrece notablemente resultando en la pérdida de actividad catalítica. Una estrategia para evitar lo antedicho consiste en emplear sustratos capaces de complejar al Fe(III) a pHs cercanos a la neutralidad. En este contexto, se pudieron obtener las funciones de distribución de los complejos formados entre el Fe(III) y diferentes ligandos derivados del ácido salicílico y se comprobó el efecto del pH en los tiempos medios de degradación de los complejos, donde a pH=7 en presencia de luz se observaron cambios interesantes y los complejos estudiados tienen una potencial aplicación para su uso en la técnica foto-Fenton a pHs cercanos a la neutralidad.Facultad de Ciencias Agrarias y Forestale
Investigación Joven, Mar 28, 2019
Photochemical & Photobiological Sciences, 2017
Fluorescence EEM-PARAFAC has been demonstrated as an effective tool to analyze the performance of... more Fluorescence EEM-PARAFAC has been demonstrated as an effective tool to analyze the performance of photo-Fenton processes using humic-like substances from urban wastes as iron chelating agent.
Helvetica Chimica Acta, 2002
... Thomas, A., Suárez, G., Cabrerizo, F., García Einschlag, F., Martino, R., Baiocchi, C., Prama... more ... Thomas, A., Suárez, G., Cabrerizo, F., García Einschlag, F., Martino, R., Baiocchi, C., Pramauro, E. and Capparelli, A. (2002 ... 1 Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de la Plata, Casilla de Correo 16, Sucursal 4, 1900 La ...
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Papers by Fernando Sebastián García Einschlag