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Cervantes O, Valtierra-Montiel C, Sampedro-Plata L, Casillas N, Menendez N, Herrasti P. Micromotors of MnO 2 for the Recovery of Microplastics. Micromachines (Basel) 2024; 15:141. [PMID: 38258260 PMCID: PMC10821339 DOI: 10.3390/mi15010141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/24/2024]
Abstract
Plastics, primarily microplastics, are among the greatest pollutants in aquatic environments. Their removal and/or degradation in these environments are crucial to ensure an optimal future of these ecosystems. In this work, MnO2 particles were synthesized and characterized for the removal of polystyrene microplastics as a model. MnO2 catalyzes the peroxide reaction, resulting in the formation of oxygen bubbles that propel the pollutants to the surface, achieving removal efficiencies of up to 80%. To achieve this, hydrothermal synthesis was employed using various methods. Parameters such as MnO2, pH, microplastics, and H2O2 concentrations were varied to determine the optimal conditions for microplastics recovering. The ideal conditions for a low microplastic concentrations (10 mg L-1) are 0.2 g L-1 MnO2, 1.6% of H2O2 and 0.01 triton as a surfactant. In these conditions, the micromotors can recover approximately 80% of 300 nm sized polystyrene microplastic within 40 min.
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Affiliation(s)
- Oscar Cervantes
- Department of Applied Physical Chemistry, Faculty of Sciences, Autonomous University of Madrid, Francisco Tomás y Valiente 7, 28049 Madrid, Spain; (O.C.); (L.S.-P.); (N.M.)
- Department of Chemistry, Center of Exact Sciences and Engineering (CUCEI), University of Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara 44430, Jalisco, Mexico;
| | - Claudia Valtierra-Montiel
- Master’s Program in Nanomaterials Science and Technology, Natural and Exact Sciences Division, University of Guanajuato, Noria Alta S/N, Guanajuato 36050, Guanajuato, Mexico;
| | - Laura Sampedro-Plata
- Department of Applied Physical Chemistry, Faculty of Sciences, Autonomous University of Madrid, Francisco Tomás y Valiente 7, 28049 Madrid, Spain; (O.C.); (L.S.-P.); (N.M.)
| | - Norberto Casillas
- Department of Chemistry, Center of Exact Sciences and Engineering (CUCEI), University of Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara 44430, Jalisco, Mexico;
| | - Nieves Menendez
- Department of Applied Physical Chemistry, Faculty of Sciences, Autonomous University of Madrid, Francisco Tomás y Valiente 7, 28049 Madrid, Spain; (O.C.); (L.S.-P.); (N.M.)
| | - Pilar Herrasti
- Department of Applied Physical Chemistry, Faculty of Sciences, Autonomous University of Madrid, Francisco Tomás y Valiente 7, 28049 Madrid, Spain; (O.C.); (L.S.-P.); (N.M.)
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González-Sánchez ÓA, González-Ortiz LJ, Sánchez-Peña MJ, Gutiérrez-Pulido H, Cervantes O, Márquez-Sandoval F, Hernández-Bello J, Casillas N, Muñoz-Valle JF. A Novel Approach to Obtain Vaccine Effectiveness Continuous Profiles. Example Case: COVID-19 in Elderly Mexicans. Vaccines (Basel) 2023; 11:vaccines11040719. [PMID: 37112631 PMCID: PMC10142991 DOI: 10.3390/vaccines11040719] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/18/2023] [Accepted: 03/20/2023] [Indexed: 04/29/2023] Open
Abstract
Population-wide vaccination is the most promising long-term COVID-19 disease management strategy. However, the protection offered by the currently available COVID-19 vaccines wanes over time, requiring boosters to be periodically given, which represents an unattainable challenge, especially if it is necessary to apply several doses per year. Therefore, it is essential to design strategies that contribute to maximizing the control of the pandemic with the available vaccines. Achieving this objective requires knowing, as precisely and accurately as possible, the changes in vaccine effectiveness over time in each population group, considering the eventual dependence on age, sex, etc. Thus, the present work proposes a novel approach to calculating realistic effectiveness profiles against symptomatic disease. In addition, this strategy can be adapted to estimate realistic effectiveness profiles against hospitalizations or deaths. All such time-dependent profiles allow the design of improved vaccination schedules, where each dose can be administrated to the population groups so that the fulfillment of the containment objectives is maximized. As a practical example for this analysis, vaccination against COVID-19 in Mexico was considered. However, this methodology can be applied to other countries' data or to characterize future vaccines with time-dependent effectiveness values. Since this strategy uses aggregated observational data collected from massive databases, assumptions about the data validity and the course of the studied epidemic could eventually be necessary.
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Affiliation(s)
- Óscar A González-Sánchez
- Division of Technologies for the Cyber-Human Integration, University Center of Exact Sciences and Engineering (CUCEI), University of Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara C.P. 44430, Jalisco, Mexico
| | - Luis J González-Ortiz
- Department of Chemistry, University Center of Exact Sciences and Engineering (CUCEI), University of Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara C.P. 44430, Jalisco, Mexico
| | - M Judith Sánchez-Peña
- Department of Chemistry, University Center of Exact Sciences and Engineering (CUCEI), University of Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara C.P. 44430, Jalisco, Mexico
| | - Humberto Gutiérrez-Pulido
- Department of Mathematics, University Center of Exact Sciences and Engineering (CUCEI), University of Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara C.P. 44430, Jalisco, Mexico
| | - Oscar Cervantes
- Department of Chemistry, University Center of Exact Sciences and Engineering (CUCEI), University of Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara C.P. 44430, Jalisco, Mexico
| | - Fabiola Márquez-Sandoval
- Department of Human Reproduction, Child Growth and Development, University Center of Health Sciences (CUCS), University of Guadalajara, Sierra Mojada 950, Col. Independencia, Guadalajara C.P. 44340, Jalisco, Mexico
| | - Jorge Hernández-Bello
- Institute of Research in Biomedical Sciences, University Center of Health Sciences (CUCS), University of Guadalajara, Sierra Mojada 950, Col. Independencia, Guadalajara C.P. 44340, Jalisco, Mexico
| | - Norberto Casillas
- Department of Chemistry, University Center of Exact Sciences and Engineering (CUCEI), University of Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara C.P. 44430, Jalisco, Mexico
| | - José Francisco Muñoz-Valle
- Institute of Research in Biomedical Sciences, University Center of Health Sciences (CUCS), University of Guadalajara, Sierra Mojada 950, Col. Independencia, Guadalajara C.P. 44340, Jalisco, Mexico
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Casillas N, Torres AM, Moret M, Gómez A, Rius-Peris JM, Mateo J. Mortality predictors in patients with COVID-19 pneumonia: a machine learning approach using eXtreme Gradient Boosting model. Intern Emerg Med 2022; 17:1929-1939. [PMID: 36098861 PMCID: PMC9469825 DOI: 10.1007/s11739-022-03033-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 06/12/2022] [Indexed: 12/15/2022]
Abstract
Recently, global health has seen an increase in demand for assistance as a result of the COVID-19 pandemic. This has prompted many researchers to conduct different studies looking for variables that are associated with increased clinical risk, and find effective and safe treatments. Many of these studies have been limited by presenting small samples and a large data set. Using machine learning (ML) techniques we can detect parameters that help us to improve clinical diagnosis, since they are a system for the detection, prediction and treatment of complex data. ML techniques can be valuable for the study of COVID-19, especially because they can uncover complex patterns in large data sets. This retrospective study of 150 hospitalized adult COVID-19 patients, of which we established two groups, those who died were called Case group (n = 53) while the survivors were Control group (n = 98). For analysis, a supervised learning algorithm eXtreme Gradient Boosting (XGBoost) has been used due to its good response compared to other methods because it is highly efficient, flexible and portable. In this study, the response to different treatments has been evaluated and has made it possible to accurately predict which patients have higher mortality using artificial intelligence, obtaining better results compared to other ML methods.
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Affiliation(s)
- N. Casillas
- Departament of Internal Medicine, Hospital Virgen de la Luz, Cuenca, Spain
- Neurobiological Research Group, Institute of Technology, Castilla-La Mancha University, Cuenca, Spain
| | - A. M. Torres
- Neurobiological Research Group, Institute of Technology, Castilla-La Mancha University, Cuenca, Spain
| | - M. Moret
- Departament of Internal Medicine, Hospital Virgen de la Luz, Cuenca, Spain
| | - A. Gómez
- Departament of Internal Medicine, Hospital Virgen de la Luz, Cuenca, Spain
| | - J. M. Rius-Peris
- Neurobiological Research Group, Institute of Technology, Castilla-La Mancha University, Cuenca, Spain
- Departament of Pediatrics, Hospital Virgen de la Luz, Cuenca, Spain
| | - J. Mateo
- Neurobiological Research Group, Institute of Technology, Castilla-La Mancha University, Cuenca, Spain
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Cervantes O, Lopez ZDR, Casillas N, Knauth P, Checa N, Cholico FA, Hernandez-Gutiérrez R, Quintero LH, Paz JA, Cano ME. A Ferrofluid with Surface Modified Nanoparticles for Magnetic Hyperthermia and High ROS Production. Molecules 2022; 27:544. [PMID: 35056860 PMCID: PMC8781673 DOI: 10.3390/molecules27020544] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/10/2022] [Accepted: 01/14/2022] [Indexed: 11/17/2022] Open
Abstract
A ferrofluid with 1,2-Benzenediol-coated iron oxide nanoparticles was synthesized and physicochemically analyzed. This colloidal system was prepared following the typical co-precipitation method, and superparamagnetic nanoparticles of 13.5 nm average diameter, 34 emu/g of magnetic saturation, and 285 K of blocking temperature were obtained. Additionally, the zeta potential showed a suitable colloidal stability for cancer therapy assays and the magneto-calorimetric trails determined a high power absorption density. In addition, the oxidative capability of the ferrofluid was corroborated by performing the Fenton reaction with methylene blue (MB) dissolved in water, where the ferrofluid was suitable for producing reactive oxygen species (ROS), and surprisingly a strong degradation of MB was also observed when it was combined with H2O2. The intracellular ROS production was qualitatively corroborated using the HT-29 human cell line, by detecting the fluorescent rise induced in 2,7-dichlorofluorescein diacetate. In other experiments, cell metabolic activity was measured, and no toxicity was observed, even with concentrations of up to 4 mg/mL of magnetic nanoparticles (MNPs). When the cells were treated with magnetic hyperthermia, 80% of cells were dead at 43 °C using 3 mg/mL of MNPs and applying a magnetic field of 530 kHz with 20 kA/m amplitude.
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Affiliation(s)
- Oscar Cervantes
- Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara C.P. 44430, Jalisco, Mexico; (O.C.); (N.C.)
| | - Zaira del Rocio Lopez
- Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, Col. Linda Vista, Ocotlan C.P. 47810, Jalisco, Mexico; (Z.d.R.L.); (P.K.); (N.C.); (F.A.C.); (J.A.P.)
| | - Norberto Casillas
- Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Marcelino García Barragán 1421, Col. Olímpica, Guadalajara C.P. 44430, Jalisco, Mexico; (O.C.); (N.C.)
| | - Peter Knauth
- Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, Col. Linda Vista, Ocotlan C.P. 47810, Jalisco, Mexico; (Z.d.R.L.); (P.K.); (N.C.); (F.A.C.); (J.A.P.)
| | - Nayeli Checa
- Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, Col. Linda Vista, Ocotlan C.P. 47810, Jalisco, Mexico; (Z.d.R.L.); (P.K.); (N.C.); (F.A.C.); (J.A.P.)
| | - Francisco Apolinar Cholico
- Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, Col. Linda Vista, Ocotlan C.P. 47810, Jalisco, Mexico; (Z.d.R.L.); (P.K.); (N.C.); (F.A.C.); (J.A.P.)
| | - Rodolfo Hernandez-Gutiérrez
- Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C. Av. Normalistas 800 Colinas de La Normal, Guadalajara C.P. 44270, Jalisco, Mexico;
| | - Luis Hector Quintero
- Centro Universitario de Ciencias Económico Administrativas, Universidad de Guadalajara, Periférico Norte 799, Col. Los Belenes, Zapopan C.P. 45100, Jalisco, Mexico;
| | - Jose Avila Paz
- Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, Col. Linda Vista, Ocotlan C.P. 47810, Jalisco, Mexico; (Z.d.R.L.); (P.K.); (N.C.); (F.A.C.); (J.A.P.)
| | - Mario Eduardo Cano
- Centro Universitario de la Ciénega, Universidad de Guadalajara, Av. Universidad 1115, Col. Linda Vista, Ocotlan C.P. 47810, Jalisco, Mexico; (Z.d.R.L.); (P.K.); (N.C.); (F.A.C.); (J.A.P.)
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Casillas N, Stepanov S, Ocegueda M, Hernández E. Self-referencing mW-scale detection of sub-ns optical phase modulation in acetylene at 1530 nm. Appl Opt 2019; 58:6495-6503. [PMID: 31503577 DOI: 10.1364/ao.58.006495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 07/12/2019] [Indexed: 06/10/2023]
Abstract
Application of the phase memory of acetylene (C2H2) vibrational-rotational transitions in the 1520-1540 nm wavelength range for a self-referencing homodyne detection of a sub-nanosecond optical phase modulation is reported. In the proposed configuration the collinearly propagating coherent dipole radiation of the excited molecule acts like a phase-locked reference wave (local oscillator) that enables transformation of the initial phase modulation into the intensity one. This technique does not need high light intensity and can operate in a linear range of the medium optical absorption. The linear optical phase demodulation (i.e., transformation of the phase-to-amplitude light modulation) is interpreted as an introduction of an additional phase shift to the carrier frequency component of the modulated signal in the maximum of the dispersion curve of a narrow optical absorption peak. It has been experimentally demonstrated with the bulk 10 cm long cuvette filled with low pressure (∼2 Torr) acetylene at room temperature. Effective demodulation of the milliwatt-scale incident laser wave of a single- and multi-mode structure is shown. As expected, the response to the fast (<1 ns) phase modulation was quadratic when the acetylene inhomogeneous Doppler-broadened (∼500 MHz) absorption line is excited in its center and was linearized by tuning at one of the absorption line sides. It is of a differentiating (high-pass) type with the cutoff frequency determined by the total spectral width of the utilized absorption line. Expected detection resolution is determined by the photon noise of the incident light intensity.
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Martínez-Martínez F, Gutiérrez-Becerra A, Casillas N, Gradzielski M, Escalante JI, Bárcena-Soto M. Characterization of reverse microemulsion formed with functionalized surfactants based on ferrycianide ions. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.01.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Kudur Jayaprakash G, Swamy BK, Casillas N, Flores-Moreno R. Analytical Fukui and cyclic voltammetric studies on ferrocene modified carbon electrodes and effect of Triton X-100 by immobilization method. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.11.154] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ortiz-Ibarra H, Torres-Vitela R, Gómez-Salazar S, Casillas N, Ponce de León C, Walsh FC. Enhancement of antibacterial efficiency at silver electrodeposited on coconut shell activated carbon by modulating pulse frequency. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3795-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kudur Jayaprakash G, Casillas N, Astudillo-Sánchez PD, Flores-Moreno R. Role of Defects on Regioselectivity of Nano Pristine Graphene. J Phys Chem A 2016; 120:9101-9108. [PMID: 27797503 DOI: 10.1021/acs.jpca.6b08810] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gururaj Kudur Jayaprakash
- Departamento
de Ingeniería de Proyectos, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Boulevard Marcelino García
Barragán 1421, Guadalajara, Jalisco, C.P. 44430, Mexico
| | - Norberto Casillas
- Departamento
de Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad Guadalajara, Boulevard Marcelino García
Barragán 1421, Guadalajara, Jalisco, C.P. 44430, Mexico
| | - Pablo D. Astudillo-Sánchez
- Departamento
de Ingenierías, Centro Universitario de Tonalá, Universidad Guadalajara, Av. Nuevo Periférico No. 555, Ejido San
José Tatepozco, Tonalá, Jalisco, C.P. 48525, Mexico
| | - Roberto Flores-Moreno
- Departamento
de Química, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad Guadalajara, Boulevard Marcelino García
Barragán 1421, Guadalajara, Jalisco, C.P. 44430, Mexico
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Bravo-Anaya L, Macías E, Casillas N, Ramos FC, Fernández V, Soltero J, Larios-Durán E. The Scaling of Electrochemical Parameters of DNA Aqueous Solutions with Concentration and Temperature Through an Electrochemical Impedance Spectroscopy Study. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.03.106] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Gutiérrez-Becerra A, Martínez-Martínez F, Bárcena-Soto M, Casillas N, Ceja I, Prévost S, Gradzielski M, Escalante JI. Direct synthesis of different metal hexacyanoferrate nanoparticles in reverse microemulsions by using a ferrocyanide functionalized surfactant. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.12.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gutiérrez-Becerra A, Barcena-Soto M, Soto V, Arellano-Ceja J, Casillas N, Prévost S, Noirez L, Gradzielski M, Escalante JI. Structure of reverse microemulsion-templated metal hexacyanoferrate nanoparticles. Nanoscale Res Lett 2012; 7:83. [PMID: 22264404 PMCID: PMC3282649 DOI: 10.1186/1556-276x-7-83] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Accepted: 01/20/2012] [Indexed: 05/16/2023]
Abstract
The droplet phase of a reverse microemulsion formed by the surfactant cetyltrimethylammonium ferrocyanide was used as a matrix to synthesize nanoparticles of nickel hexacyanoferrate by adding just a solution of NiCl2 to the microemulsion media. Dynamic light scattering and small-angle neutron scattering measurements show that the reverse microemulsion droplets employed have a globular structure, with sizes that depend on water content. Transmission electron microscopy and electron diffraction are used to obtain information about the structure of the synthesized nanoparticles. The results show that the size and shape of the coordination compound nanoparticles correspond with the size and shape of the droplets, suggesting that the presented system constitutes an alternative method of the synthesis of metal hexacyanoferrate nanoparticles.
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Affiliation(s)
- Alberto Gutiérrez-Becerra
- Chemistry Department, University of Guadalajara, Boul. M. García Barragán # 1451, Guadalajara, Jalisco, 44430, Mexico
| | - Maximiliano Barcena-Soto
- Chemistry Department, University of Guadalajara, Boul. M. García Barragán # 1451, Guadalajara, Jalisco, 44430, Mexico
| | - Víctor Soto
- Chemistry Department, University of Guadalajara, Boul. M. García Barragán # 1451, Guadalajara, Jalisco, 44430, Mexico
| | - Jesús Arellano-Ceja
- Chemistry Department, University of Guadalajara, Boul. M. García Barragán # 1451, Guadalajara, Jalisco, 44430, Mexico
| | - Norberto Casillas
- Chemistry Department, University of Guadalajara, Boul. M. García Barragán # 1451, Guadalajara, Jalisco, 44430, Mexico
| | - Sylvain Prévost
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC7, Berlin, 10623, Germany
| | - Laurence Noirez
- Laboratoire Léon Brillouin (CEA-CNRS), CEA Saclay, Gif-sur-Yvette, 91191, France
| | - Michael Gradzielski
- Stranski-Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC7, Berlin, 10623, Germany
| | - José I Escalante
- Chemistry Department, University of Guadalajara, Boul. M. García Barragán # 1451, Guadalajara, Jalisco, 44430, Mexico
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Ibanez JG, Carreon-Alvarez A, Barcena-Soto M, Casillas N. Metals in alcoholic beverages: A review of sources, effects, concentrations, removal, speciation, and analysis. J Food Compost Anal 2008. [DOI: 10.1016/j.jfca.2008.06.005] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Carreon‐Alvarez A, Casillas N, Ibanez JG, Hernandez F, Prado‐Ramírez R, Barcena‐Soto M, Go´mez-Salazar S. Determination of Cu in Tequila by Anodic Stripping Voltammetry. ANAL LETT 2008. [DOI: 10.1080/00032710701577989] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ortiz-Ibarra H, Casillas N, Soto V, Barcena-Soto M, Torres-Vitela R, de la Cruz W, Gómez-Salazar S. Surface characterization of electrodeposited silver on activated carbon for bactericidal purposes. J Colloid Interface Sci 2007; 314:562-71. [PMID: 17617417 DOI: 10.1016/j.jcis.2007.05.062] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2007] [Revised: 04/18/2007] [Accepted: 05/20/2007] [Indexed: 11/18/2022]
Abstract
The use of an electrochemical reactor operated under different flow conditions to deposit silver from aqueous AgNO(3) solutions and tartaric acid as an organic additive on a commercial activated carbon with ultimate bactericidal applications in water purification processes is presented. The characterization of carbon/silver samples was studied by BET, FTIR, X-ray diffraction, XPS, and SEM techniques. The bactericidal activity of the carbon/silver samples was tested on drinking water samples inoculated with E. coli. A reduction of carbon surface area was detected and was caused by increased amounts of silver deposited on carbon samples. Adherent silver deposits were obtained on the carbon/silver samples. X-ray diffraction studies of carbon with electrodeposited silver showed two different preferential deposition planes, [111] and [220]. The FTIR results confirm the presence of carboxyl, phenolic, quinone, and ether surface groups. The XPS results suggest the formation of Ag(2)O and AgO surface species and confirm the reduction of silver to the metallic form. Antimicrobial activity toward E. coli indicated reductions by up to 7 orders of magnitude in the log CFU/mL in just 10 min contact time and for silver contents of 2.47 wt%.
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Affiliation(s)
- Hector Ortiz-Ibarra
- Chemical Engineering Department, University of Guadalajara, Blvd. Marcelino García Barragán #1451, Guadalajara, Jalisco 44430, Mexico
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Rincón ME, Trujillo ME, Ávalos J, Casillas N. Photoelectrochemical processes at interfaces of nanostructured TiO2/carbon black composites studied by scanning photoelectrochemical microscopy. J Solid State Electrochem 2007. [DOI: 10.1007/s10008-007-0288-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sosa E, Cabrera-Sierra R, Oropeza M, Hernández F, Casillas N, Tremont R, Cabrera C, González I. Electrochemically grown passive films on carbon steel (SAE 1018) in alkaline sour medium. Electrochim Acta 2003. [DOI: 10.1016/s0013-4686(03)00145-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Casillas N, Snyder SR, Smyrl WH, White HS. Correlation of electron-transfer rates with the surface density of states of native and anodically grown oxide films on titanium. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100171a051] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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