Browsing by Author "Caceres-Jensen, Lizethly"

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    Controlled Ag-tio2 heterojunction obtained by combining physical vapor deposition and bifunctional surface modifiers
    (2018) Barrientos, Lorena; Allende, Patricio; Angel Laguna-Bercero, Miguel; Pastrian, Juan; Rodriguez-Becerra, Jorge; Caceres-Jensen, Lizethly
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    Role of Organic Matter, Iron Oxides and Aluminosilicate Content on Physicochemical Interactions between Ciprofloxacin and Andisol Soil
    (Springer International Publishing AG, 2025) Urdiales, Cristian; Varas Gutiérrez, Mauricio Janssen; Suazo-Hernández, Jonathan; Pizarro, Carmen; Escudey, Mauricio; Caceres-Jensen, Lizethly; Antilen Lizana, Mónica Paulina
    Purpose The widespread use of antibiotics to treat infectious diseases in humans and animals has raised signifcant environmental concerns due to their presence in soils. The interaction between natural aluminosilicates such as allophane, both with and without iron oxides (FexOy) and organic matter (OM) coatings, in the adsorption of Ciprofoxacin (CIP) remains still unexplored. The objective of this study is to establish the role of diferent soil components, OM and FexOy, in the adsorption of CIP in soils. Methods Santa Bárbara (SB) series soil and chemically treated substrates without OM (SB1) and without OM and FexOy (SB2) were characterized. All CIP adsorption studies were conducted through batch experiments in an electrochemical cell, by using square wave voltammetry to determine CIP concentration. Results Adsorption isotherms revealed two types of adsorption sites in the SB soil: instantaneous and time dependent. The Langmuir-Freundlich model explained cooperative adsorption, while the Freundlich model aligned with SB1 and SB2 samples. SB1 showed higher adsorption capacity but lower intensity than SB2. The removal of OM and FexOy notably infuences the adsorption behavior, resulting in lower capacities than the original SB soil. Conclusions This study emphasizes the complex interaction between CIP and soil components. The adsorption data highlights the strong binding of CIP to soil particles and substrates, suggesting a low leaching potential. The calculated GUS index of 2.758 further supports this, indicating a moderate leaching potential and reinforcing the importance of understanding the strength of CIP binding in environmental matrices. This knowledge is crucial for assessing its mobility and developing strategies to minimize its environmental impact.
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    Role of Organic Matter, Iron Oxides and Aluminosilicate Content on Physicochemical Interactions between Ciprofloxacin and Andisol Soil
    (HUMANA PRESS INC, 2025) Urdiales, Cristian; Varas Gutiérrez, Mauricio Janssen; Suazo-Hernández, Jonathan; Pizarro, Carmen; Escudey, Mauricio; Caceres-Jensen, Lizethly; Antilen Lizana, Mónica Paulina
    Purpose The widespread use of antibiotics to treat infectious diseases in humans and animals has raised signifcant environmental concerns due to their presence in soils. The interaction between natural aluminosilicates such as allophane, both with and without iron oxides (FexOy) and organic matter (OM) coatings, in the adsorption of Ciprofoxacin (CIP) remains still unexplored. The objective of this study is to establish the role of diferent soil components, OM and FexOy, in the adsorption of CIP in soils. Methods Santa Bárbara (SB) series soil and chemically treated substrates without OM (SB1) and without OM and FexOy (SB2) were characterized. All CIP adsorption studies were conducted through batch experiments in an electrochemical cell, by using square wave voltammetry to determine CIP concentration. Results Adsorption isotherms revealed two types of adsorption sites in the SB soil: instantaneous and time dependent. The Langmuir-Freundlich model explained cooperative adsorption, while the Freundlich model aligned with SB1 and SB2 samples. SB1 showed higher adsorption capacity but lower intensity than SB2. The removal of OM and FexOy notably infuences the adsorption behavior, resulting in lower capacities than the original SB soil. Conclusions This study emphasizes the complex interaction between CIP and soil components. The adsorption data highlights the strong binding of CIP to soil particles and substrates, suggesting a low leaching potential. The calculated GUS index of 2.758 further supports this, indicating a moderate leaching potential and reinforcing the importance of understanding the strength of CIP binding in environmental matrices. This knowledge is crucial for assessing its mobility and developing strategies to minimize its environmental impact.
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    Study of Sorption Kinetics and Sorption-Desorption Models to Assess the Transport Mechanisms of 2,4-Dichlorophenoxyacetic Acid on Volcanic Soils
    (2021) Caceres-Jensen, Lizethly; Rodriguez-Becerra, Jorge; Garrido, Carlos; Escudey, Mauricio; Barrientos, Lorena; Parra-Rivero, Jocelyn; Dominguez-Vera, Valentina; Loch-Arellano, Bruno
    The sorption behavior of 2,4-dichlorophenoxyacetic acid (2,4-D) in the abundant agricultural volcanic ash-derived soils (VADS) is not well understood despite being widely used throughout the world, causing effects to the environment and human health. The environmental behavior and risk assessment of groundwater pollution by pesticides can be evaluated through kinetic models. This study evaluated the sorption kinetics and 2,4-D sorption-desorption in ten VADS through batch sorption experiments. Differences in the sorption extent for the fast and slow phases was observed through the IPD model where 2,4-D sorption kinetics was controlled by external mass transfer and intra organic matter diffusion in Andisols (C1 not equal 0). We confirmed from the spectroscopic analysis that the carboxylate group directly drives the interaction of 2,4-D on Andisol soil. The MLR model showed that IEP, FeDCB, and pHxSilt are important soil descriptors in the 2,4-D sorption in VADS. The Freundlich model accurately represented sorption equilibrium data in all cases (Kf values between 1.1 and 24.1 mu g(1-1/n) mL(1/n)g(-1)) with comparatively higher sorption capacity on Andisols, where the highest hysteresis was observed in soils that presented the highest and lowest OC content (H close to 0).