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In this work, scanning electron microscopy (SEM), X-ray diffraction (XRD), and infrared spectroscopy (FTIR) techniques were used to study blue, red, and ochre pigments from wall paintings of the 16th century colonial convent of San Nicolás de Tolentino in Actopan, Hidalgo, Mexico. In the blue pigments, nanometric fibers with a chemical composition of mostly O, Si, Al, and Mg were identified. XRD and FTIR analysis indicated the presence of palygorskite clay, which suggests that these analyzed blue pigments are similar to Mayan blue. In the red pigment, structures with different morphologies (spines and flake shapes, for instance), with a composition of C, O, Al, Si, S, Ca, Na, Mg, and K and a higher concentration of Fe and Pb, were observed. Complementary analysis showed that the red color originates from hematite and lead. Finally, the ochre pigment showed a significant presence of O and Fe, which was associated with the goethite mineral, while calcite was a crystalline phase identified in all analyzed pigments; these show that these pigments are characteristic of the known Mexican Colonial color palette.
Jesús Benjamín Ortega-Lazcano; Demetrio Mendoza-Anaya; Eleazar Salinas-Rodríguez; Juan Hernández-Ávila; Otilio Arturo Acevedo-Sandoval; Ventura Rodríguez-Lugo. Study of Pigments from the Colonial Convent of Actopan, Hidalgo, Mexico. Minerals 2021, 11, 852 .
AMA StyleJesús Benjamín Ortega-Lazcano, Demetrio Mendoza-Anaya, Eleazar Salinas-Rodríguez, Juan Hernández-Ávila, Otilio Arturo Acevedo-Sandoval, Ventura Rodríguez-Lugo. Study of Pigments from the Colonial Convent of Actopan, Hidalgo, Mexico. Minerals. 2021; 11 (8):852.
Chicago/Turabian StyleJesús Benjamín Ortega-Lazcano; Demetrio Mendoza-Anaya; Eleazar Salinas-Rodríguez; Juan Hernández-Ávila; Otilio Arturo Acevedo-Sandoval; Ventura Rodríguez-Lugo. 2021. "Study of Pigments from the Colonial Convent of Actopan, Hidalgo, Mexico." Minerals 11, no. 8: 852.
Infinite size silicon–germanium alloy nanotubes of several types, armchair, zigzag and chiral, are studied by theoretical analysis based on density functional theory as implemented in the SIESTA code.
Alejandro de Jesus Herrera Carbajal; Ventura Rodríguez-Lugo; Juan Hernández-Ávila; Ariadna Sánchez-Castillo. A theoretical study on the electronic, structural and optical properties of armchair, zigzag and chiral silicon–germanium nanotubes. Physical Chemistry Chemical Physics 2021, 23, 13075 -13086.
AMA StyleAlejandro de Jesus Herrera Carbajal, Ventura Rodríguez-Lugo, Juan Hernández-Ávila, Ariadna Sánchez-Castillo. A theoretical study on the electronic, structural and optical properties of armchair, zigzag and chiral silicon–germanium nanotubes. Physical Chemistry Chemical Physics. 2021; 23 (23):13075-13086.
Chicago/Turabian StyleAlejandro de Jesus Herrera Carbajal; Ventura Rodríguez-Lugo; Juan Hernández-Ávila; Ariadna Sánchez-Castillo. 2021. "A theoretical study on the electronic, structural and optical properties of armchair, zigzag and chiral silicon–germanium nanotubes." Physical Chemistry Chemical Physics 23, no. 23: 13075-13086.
Usually in the manufacture of beer by fermentation of barley, in both industrialized and developing countries significant amounts of organic solid waste are produced from barley straw. These possibly have an impact on the carbon footprint with an effect on global warming. According to this, it is important to reduce environmental impact of these solid residues, and an adequate way is the recycling using them as raw material for the elaboration of handmade paper. Therefore, it is required to manage this type of waste by analyzing the environmental impact, and thus be able to identify sustainable practices for the treatment of this food waste, evaluating its life cycle, which is a useful methodology to estimate said environmental impacts. It is because of this work shows the main results obtained using the life cycle analysis (LCA) methodology, to evaluate the possible environmental impacts during the waste treatment of a brewery located in the state of Hidalgo, Mexico. The residues evaluated were barley straw, malt residues and spent grain, and at the end, barley straw was selected to determine in detail its environmental impact and its reuse, the sheets analyzed presented a grammage that varies from 66 g/m2 and 143 g/m2, resistance to burst was 117 to 145 kpa, with a crystallinity of 34.4% to 37.1%.
Alma Delia Delia Román Gutiérrez; Juan Hernandez Avila; Antonia Karina Vargas M.; Eduardo Cerecedo Saenz; Eleazar Salinas-Rodríguez. Reuse of Barley Straw for Handmade Paper Production. 2021, 1 .
AMA StyleAlma Delia Delia Román Gutiérrez, Juan Hernandez Avila, Antonia Karina Vargas M., Eduardo Cerecedo Saenz, Eleazar Salinas-Rodríguez. Reuse of Barley Straw for Handmade Paper Production. . 2021; ():1.
Chicago/Turabian StyleAlma Delia Delia Román Gutiérrez; Juan Hernandez Avila; Antonia Karina Vargas M.; Eduardo Cerecedo Saenz; Eleazar Salinas-Rodríguez. 2021. "Reuse of Barley Straw for Handmade Paper Production." , no. : 1.
Structural and morphological properties of hydronium-potassium jarosite microstructures were investigated in this work, and their electrical properties were evaluated. All the microstructures were synthesized at a very low temperature of 70 °C with a reduced reaction time of 3 h. An increase in the pH from 0.8 to 2.1 decreased the particle sizes from 3 µm to 200 nm and an increase in the aging time from zero, three, and seven days resulted in semispherical, spherical, and euhedral jarosite structures, respectively. The Rietveld analysis also confirmed that the amount of hydronium substitution by potassium in the cationic site increased with an increase in pH. The percentages of hydronium jarosite (JH)/potassium jarosite (JK) for pH values of 0.8, 1.1, and 2.1 were 77.72/22.29%, 82.44/17.56%, and 89.98/10.02%, respectively. Microstructures obtained in this work were tested as alternative anode materials and the voltage measured using these electrodes made with hydronium-potassium jarosite microstructures and graphite ranged from 0.89 to 1.36 V. The results obtained in this work show that with reduced particle size and euhedral morphology obtained, modified jarosite microstructures can be used as anode materials for improving the lifetime of lithium-ion batteries.
Elías Hernández-Lazcano; E. Cerecedo-Sáenz; J. Hernández-Ávila; Norman Toro; T. V. K. Karthik; D. Mendoza-Anaya; M. E. Fernández-García; V. Rodríguez-Lugo; E. Salinas-Rodríguez. Synthesis of Hydronium-Potassium Jarosites: The Effect of pH and Aging Time on Their Structural, Morphological, and Electrical Properties. Minerals 2021, 11, 80 .
AMA StyleElías Hernández-Lazcano, E. Cerecedo-Sáenz, J. Hernández-Ávila, Norman Toro, T. V. K. Karthik, D. Mendoza-Anaya, M. E. Fernández-García, V. Rodríguez-Lugo, E. Salinas-Rodríguez. Synthesis of Hydronium-Potassium Jarosites: The Effect of pH and Aging Time on Their Structural, Morphological, and Electrical Properties. Minerals. 2021; 11 (1):80.
Chicago/Turabian StyleElías Hernández-Lazcano; E. Cerecedo-Sáenz; J. Hernández-Ávila; Norman Toro; T. V. K. Karthik; D. Mendoza-Anaya; M. E. Fernández-García; V. Rodríguez-Lugo; E. Salinas-Rodríguez. 2021. "Synthesis of Hydronium-Potassium Jarosites: The Effect of pH and Aging Time on Their Structural, Morphological, and Electrical Properties." Minerals 11, no. 1: 80.
Structural and morphological properties of the hydronium-potassium jarosite microstructures were investigated in this work, and their electrical properties were evaluated. All microstructures were synthesized at a reasonable temperature of 343 K with a reduced reaction time of 3 hours. Increase in the pH from 0.8 to 2.1 decreased the particle sized from 3 µm to 200 nm and increasing the aging time from 0, 3 to 7 days resulted in semispherical, spherical and euhedreal jarosite structures, respectively. A Rietveld analysis also was done, finding that increasing pH, the amount of hydronium substitution by potassium in the cationic site also increases, having a 77.72 % of hydronium jarosite (JH) plus 22.29 % potassium jarosite (JK) at pH 0.8; 82.44 % (JH) and 17.56 % (JK) at pH 1.1, and 89.98 % (JH) plus 10.02 % (JK) at pH 2.1. The results obtained in this work show that the obtained hydronium potassium jarosite microstructures with reduced particle size and euhedreal morphology can be used as anode materials for improving the life time of lithium ion batteries, due that during the analysis of the voltage obtained using electrodes made with this particles and graphite, this ranged from 0.89 to 1.36 V.
Elías Hernández-Lazcano; E. Cerecedo-Sáenz; J. Hernández-Ávila; Norman Toro; T.V.K. Karthik; D. Mendoza-Anaya; M. E. Fernández-García; V. Rodríguez-Lugo; E. Salinas-Rodríguez. Synthesis of Hydronium-Potassium Jarosite; Effect of pH and Aging Time on their Structural, Morphological and Electrical Properties. 2020, 1 .
AMA StyleElías Hernández-Lazcano, E. Cerecedo-Sáenz, J. Hernández-Ávila, Norman Toro, T.V.K. Karthik, D. Mendoza-Anaya, M. E. Fernández-García, V. Rodríguez-Lugo, E. Salinas-Rodríguez. Synthesis of Hydronium-Potassium Jarosite; Effect of pH and Aging Time on their Structural, Morphological and Electrical Properties. . 2020; ():1.
Chicago/Turabian StyleElías Hernández-Lazcano; E. Cerecedo-Sáenz; J. Hernández-Ávila; Norman Toro; T.V.K. Karthik; D. Mendoza-Anaya; M. E. Fernández-García; V. Rodríguez-Lugo; E. Salinas-Rodríguez. 2020. "Synthesis of Hydronium-Potassium Jarosite; Effect of pH and Aging Time on their Structural, Morphological and Electrical Properties." , no. : 1.
En el presente estudio se llevo a cabo la cinética de molienda tamaño por tamaño y especie por especie de las escombreras de Dos Carlos de la ciudad de Pachuca, Hidalgo, México; presentando una composición química promedio en % de 70.43 de SiO2, 7.032 de Al2O3, 2.69 de Fe2O3, 0.70 de Mn, 3.98 de K2O, 3.34 de CaO, 2.50 de Na2O, 1.01 de MgO, 0.26 de TiO2, 0.04 de Zn, 0.026 de Pb, 56 g/ton de Ag y 0.6 g/ton de Au; apreciándose como fases mineralógicas mayoritarias: cuarzo, albita, argentita, berlinita, ortoclasa, jarosita de potasio argentífera, jarosita de sodio argentífera, feldespato, Anortoclasa, Calcita. Los resultados experimentales muestran que a medida que el tiempo de molienda se incrementa hasta valores comprendidos entre 32 y 46 minutos, la distribución de los contenidos metálicos es muy similar y se encuentran dados por el rango de 200 a 400 mallas, la máxima velocidad especifica de molienda global (tamaño por tamaño) y por especie correspondiente a la malla 200, para tamaños menores a la malla 200 se genera una disminución en la velocidad especifica por especie (plata), determinandose que el tiempo óptimo de molienda encontrado bajo estas condiciones estudiadas fue de 8 minutos.
Juan Hernández-Ávila; Eduardo Cerecedo-Saenz; Norman Toro; Alberto Arenas-Flores; Ventura Rodríguez-Lugo; Eleazar Salinas-Rodríguez. Cinética de Molienda de las Escombreras del Distrito Pachuca-Real del Monte, Estado de Hidalgo, México. Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 2020, 8, 74 -79.
AMA StyleJuan Hernández-Ávila, Eduardo Cerecedo-Saenz, Norman Toro, Alberto Arenas-Flores, Ventura Rodríguez-Lugo, Eleazar Salinas-Rodríguez. Cinética de Molienda de las Escombreras del Distrito Pachuca-Real del Monte, Estado de Hidalgo, México. Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI. 2020; 8 (Especial):74-79.
Chicago/Turabian StyleJuan Hernández-Ávila; Eduardo Cerecedo-Saenz; Norman Toro; Alberto Arenas-Flores; Ventura Rodríguez-Lugo; Eleazar Salinas-Rodríguez. 2020. "Cinética de Molienda de las Escombreras del Distrito Pachuca-Real del Monte, Estado de Hidalgo, México." Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 8, no. Especial: 74-79.
En este artículo se estudiaron las características de un mortero puzolánico, el cual se generó sustituyendo dentro de la mezcla un porcentaje del volumen de la arena por uno similar de diatomita, perlita o zeolita. Esto se realizó con el objetivo de definir a través de pruebas de laboratorio, los cambios generados por dicha modificación en el coeficiente de conducción térmica del material, así como su resistencia a la compresión. Todo esto se realizó porque si bien, las puzolanas naturales se han estudiado previamente como una opción para crear concretos ecológicos o elementos arquitectónicos aligerados, no se ha establecido claramente cuál es el aporte que estas pueden generar en la parte térmica hacia las pastas cementantes. Por último, la validación experimental demostró que la zeolita fue el mineral con el que se generaron las muestras de mortero con mejor relación entre la mejora del coeficiente de conducción térmica del material con respecto a una mínima reducción de su resistencia mecánica.
Eunise Sarai Flores-Lozano; Isabel Rocío López De Juambelz; Daniel Velázquez-Vázquez; Emiliano Moreno-Pérez; Juan Hernández-Ávila. Comparativa del impacto de la diatomita, perlita y zeolita en el comportamiento térmico y estructural del mortero. Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 2020, 8, 5 -13.
AMA StyleEunise Sarai Flores-Lozano, Isabel Rocío López De Juambelz, Daniel Velázquez-Vázquez, Emiliano Moreno-Pérez, Juan Hernández-Ávila. Comparativa del impacto de la diatomita, perlita y zeolita en el comportamiento térmico y estructural del mortero. Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI. 2020; 8 (Especial):5-13.
Chicago/Turabian StyleEunise Sarai Flores-Lozano; Isabel Rocío López De Juambelz; Daniel Velázquez-Vázquez; Emiliano Moreno-Pérez; Juan Hernández-Ávila. 2020. "Comparativa del impacto de la diatomita, perlita y zeolita en el comportamiento térmico y estructural del mortero." Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 8, no. Especial: 5-13.
En el presente trabajo se llevó a cabo la caracterización microestructural de mármol procedente de una cantera localizada en el Municipio de Tepexi Rodriguez en el Estado de Puebla. Los resultados por difracción de rayos X y por espectroscopia en el infrarrojo (FTIR), permitieron confirmar la presencia mayoritaria de la fase calcita, sin embargo, por la presencia de elementos químico minoritarios como Si, Al y Mg, detectados por espectroscopia de dispersión de rayos X, es posible asegurar la presencia de otras fases cristalinas en concentraciones inferiores al 1 %, que no fueron detectadas a consecuencia de límite de detección de los equipos utilizados. Por Microscopia electrónica de barrido, fue posible observar cambios significativos en el tamaño de partícula en cada una de las muestras obtenidas de cada estrato estudiado, lo que permite predecir cambios en la resistencia a los esfuerzos mecánicos.
Efrain Rubio-Rosas; Lesly Sabina Villaseñor-Cerón; Eleazar Salinas-Rodríguez; Juan Hernández-Ávila; Otilio Arturo Acevedo-Sandoval; Ventura Rodríguez-Lugo. Caracterización microestructural de mármol de una cantera localizada en el Municipio de Tepexi de Rodríguez, Estado de Puebla. Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 2020, 8, 68 -73.
AMA StyleEfrain Rubio-Rosas, Lesly Sabina Villaseñor-Cerón, Eleazar Salinas-Rodríguez, Juan Hernández-Ávila, Otilio Arturo Acevedo-Sandoval, Ventura Rodríguez-Lugo. Caracterización microestructural de mármol de una cantera localizada en el Municipio de Tepexi de Rodríguez, Estado de Puebla. Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI. 2020; 8 (Especial):68-73.
Chicago/Turabian StyleEfrain Rubio-Rosas; Lesly Sabina Villaseñor-Cerón; Eleazar Salinas-Rodríguez; Juan Hernández-Ávila; Otilio Arturo Acevedo-Sandoval; Ventura Rodríguez-Lugo. 2020. "Caracterización microestructural de mármol de una cantera localizada en el Municipio de Tepexi de Rodríguez, Estado de Puebla." Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 8, no. Especial: 68-73.
The aim of this study was to evaluate the effect of acid hydrolysis and succination upon single and a combination of both of them as a dual modification on the morphological, structural, thermal, and pasting profile of the achira starch in order to expand its potential food applications. The surface of achira starch granules was eroded with acid hydrolysis, while the succination resulted in the formation of pores or cavities, having a slight impact on the crystallinity and the gelatinization enthalpy. Succinated starch presented the lowest transition temperatures (To = 60.29 °C, Tp = 65.03 °C and Te = 69.86 °C) compared to other starches in this study. The succination increased the final viscosity (3808 cp) when compared with the native starch (3114 cp), while acid hydrolysis resulted in a decreased value (735 cp). These are desirable properties for its possible use as an additive in bakery industry processes.
Zaira E. Cabrera-Canales; Gonzalo Velazquez; María L. Rodríguez-Marín; Guadalupe Méndez-Montealvo; Juan Hernández Avila; Eduardo Morales-Sánchez; Carlos A. Gómez-Aldapa. Dual modification of achira (Canna indica L) starch and the effect on its physicochemical properties for possible food applications. Journal of Food Science and Technology 2020, 58, 952 -961.
AMA StyleZaira E. Cabrera-Canales, Gonzalo Velazquez, María L. Rodríguez-Marín, Guadalupe Méndez-Montealvo, Juan Hernández Avila, Eduardo Morales-Sánchez, Carlos A. Gómez-Aldapa. Dual modification of achira (Canna indica L) starch and the effect on its physicochemical properties for possible food applications. Journal of Food Science and Technology. 2020; 58 (3):952-961.
Chicago/Turabian StyleZaira E. Cabrera-Canales; Gonzalo Velazquez; María L. Rodríguez-Marín; Guadalupe Méndez-Montealvo; Juan Hernández Avila; Eduardo Morales-Sánchez; Carlos A. Gómez-Aldapa. 2020. "Dual modification of achira (Canna indica L) starch and the effect on its physicochemical properties for possible food applications." Journal of Food Science and Technology 58, no. 3: 952-961.
The aim of this study was to analyzing the impact of germination time on the morphology, crystallinity, gelatinization and viscosity properties on the starch of Esmeralda and Perla barley variety. The two barley were germinated for 1 to 8 days, at 26 °C and 65% relative humidity. Micrographs showed the presence of pinholes and eroded surfaces. Starch in Esmeralda was hydrolyzed completely at 8 days of germination. Birefringence was reduced from day 4, losing molecular structuring of the crystalline area. Morphometric data: fractal dimension, area, perimeter, circularity, and roundness decreased significantly along germination time in both varieties. The entropy increased significantly, from 0.79 to 10.09 in Esmeralda and from 0.46 to 7.57 in Perla. Relative crystallinity decreased significantly in the Perla from 24.7% to 23.6%. Viscosity peaks were also significantly reduced, pasting temperature was constant in Esmeralda but in Perla was significantly reduced from 95.43 to 95.19 °C with germination, the gelatinization temperature increased significantly in the Esmeralda while in Perla it remained constant. Enthalpy decreased significantly to 75.8% and 37% in Esmeralda and Perla respectively. The study of germination impact on structural and physicochemical properties is important to identify the use of hydrolyzed starches in the food industry or others.
L.J. Gutiérrez-Osnaya; J.P. Hernández-Uribe; J. Castro-Rosas; A.D. Román-Gutiérrez; B.H. Camacho-Díaz; H.M. Palma-Rodríguez; M.L. Rodríguez-Marín; Juan Hernández Avila; F.A. Guzmán-Ortiz. Influence of germination time on the morphological, morphometric, structural, and physicochemical characteristics of Esmeralda and Perla barley starch. International Journal of Biological Macromolecules 2020, 149, 262 -270.
AMA StyleL.J. Gutiérrez-Osnaya, J.P. Hernández-Uribe, J. Castro-Rosas, A.D. Román-Gutiérrez, B.H. Camacho-Díaz, H.M. Palma-Rodríguez, M.L. Rodríguez-Marín, Juan Hernández Avila, F.A. Guzmán-Ortiz. Influence of germination time on the morphological, morphometric, structural, and physicochemical characteristics of Esmeralda and Perla barley starch. International Journal of Biological Macromolecules. 2020; 149 ():262-270.
Chicago/Turabian StyleL.J. Gutiérrez-Osnaya; J.P. Hernández-Uribe; J. Castro-Rosas; A.D. Román-Gutiérrez; B.H. Camacho-Díaz; H.M. Palma-Rodríguez; M.L. Rodríguez-Marín; Juan Hernández Avila; F.A. Guzmán-Ortiz. 2020. "Influence of germination time on the morphological, morphometric, structural, and physicochemical characteristics of Esmeralda and Perla barley starch." International Journal of Biological Macromolecules 149, no. : 262-270.
Studying the dissolution of chalcocite allows to understand the behavior of the most abundant secondary sulfide ore in copper deposits, while digenite (Cu1.8S) and other intermediate sulfides (Cu2−xS) are often associated with chalcocite. The most common mechanism of dissolution is by two stages, and chloride ions benefit the kinetics of dissolution. In this study, a pure chalcocite mineral (99.9% according to XRD (X-Ray Diffraction) analysis) is leached in chloride media using NaCl and wastewater as the sources of chloride. Magnetic leaching tests are performed at 65, 75, and 95 °C, using a particle size between −150 and + 106 μm. Chloride concentration and leaching time are the main variables. A substantial dissolution of chalcocite was obtained with 0.5 M H2SO4, 100 g/L of chloride and a leaching time of 3 h. The apparent activation energy (Ea) derived from the slopes of the Arrhenius plots was 36 kJ/mol. The XRD analysis proves the presence of elemental sulfur (S0) as the main component in the leaching residue. No significant differences in copper extraction were detected when using 100 g/L of chloride ion or wastewater (39 g/L).
Kevin Pérez; Ricardo I. Jeldres; Steven Nieto; Eleazar Salinas-Rodríguez; Pedro Robles; Víctor Quezada; Juan Hernández Avila; Norman Toro. Leaching of Pure Chalcocite in a Chloride Media Using Waste Water at High Temperature. Metals 2020, 10, 384 .
AMA StyleKevin Pérez, Ricardo I. Jeldres, Steven Nieto, Eleazar Salinas-Rodríguez, Pedro Robles, Víctor Quezada, Juan Hernández Avila, Norman Toro. Leaching of Pure Chalcocite in a Chloride Media Using Waste Water at High Temperature. Metals. 2020; 10 (3):384.
Chicago/Turabian StyleKevin Pérez; Ricardo I. Jeldres; Steven Nieto; Eleazar Salinas-Rodríguez; Pedro Robles; Víctor Quezada; Juan Hernández Avila; Norman Toro. 2020. "Leaching of Pure Chalcocite in a Chloride Media Using Waste Water at High Temperature." Metals 10, no. 3: 384.
Some sedimentary minerals have attractive contents of gold and silver, like a sedimentary exhalative ore available in the eastern of Hidalgo in Mexico. The gold and silver contained represent an interesting opportunity for processing by non-toxic and aggressive leaching reagents like thiosulfate. The preliminary kinetic study indicated that the leaching process was poorly affected by temperature and thiosulfate concentration. The reaction order was −0.61 for Ag, considering a thiosulfate concentration between 200–500 mol·m−3, while, for Au, it was −0.09 for a concentration range between 32–320 mol·m–3. By varying the pH 7–10, it was found that the reaction order was n = 5.03 for Ag, while, for Au, the value was n = 0.94, considering pH 9.5–11. The activation energy obtained during the silver leaching process was 3.15 kJ·mol−1 (298–328 K), which was indicative of a diffusive control of the process. On the other hand, during gold leaching, the activation energy obtained was of 36.44 kJ·mol−1, which was indicative that this process was mixed controlled process, first at low temperatures by diffusive control (298–313 K) and then by chemical control (318–323 K).
Edmundo Roldán-Contreras; Eleazar Salinas-Rodríguez; Juan Hernández-Ávila; Eduardo Cerecedo-Sáenz; Ventura Rodríguez-Lugo; Ricardo I. Jeldres; Norman Toro; Salinas- Rodríguez. Leaching of Silver and Gold Contained in a Sedimentary Ore, Using Sodium Thiosulfate; A Preliminary Kinetic Study. Metals 2020, 10, 159 .
AMA StyleEdmundo Roldán-Contreras, Eleazar Salinas-Rodríguez, Juan Hernández-Ávila, Eduardo Cerecedo-Sáenz, Ventura Rodríguez-Lugo, Ricardo I. Jeldres, Norman Toro, Salinas- Rodríguez. Leaching of Silver and Gold Contained in a Sedimentary Ore, Using Sodium Thiosulfate; A Preliminary Kinetic Study. Metals. 2020; 10 (2):159.
Chicago/Turabian StyleEdmundo Roldán-Contreras; Eleazar Salinas-Rodríguez; Juan Hernández-Ávila; Eduardo Cerecedo-Sáenz; Ventura Rodríguez-Lugo; Ricardo I. Jeldres; Norman Toro; Salinas- Rodríguez. 2020. "Leaching of Silver and Gold Contained in a Sedimentary Ore, Using Sodium Thiosulfate; A Preliminary Kinetic Study." Metals 10, no. 2: 159.
The generation of mining waste commonly led to the use of spaces for its disposal. Challenges like mitigating the damage to surrounding communities have promoted the need to reuse, recycle and/or reduce their generation. Besides, these residues may become a source of materials, which are capable of being recovered and reused in several industries, minimizing the environmental impact. In the mining region of Pachuca, Mexico, waste from the mining industry have been generated for more than 100 years, which have a high SiO2 content that can be recovered for various industrial applications. This work aims to recover silica from a material of the Dos Carlos dam. A columnar system composed of two-stage of cleaning was used, considering a JLT (surface liquid rate) value of 0.45 and 0.68 cm/s, respectively; while the Jg (surface gas rate) value was 0.30 cm/s for both stages. Similar bubble sizes in the range of Jg 0.10 to 0.30 cm/s, with values between 0.14 and 0.16 cm in the first stage, and 0.05 to 0.06 cm in the second one. This provided a recovery of 75.10% for all the allotropic phases of silica (quartz, trydimite, and cristobalite) leaving a concentration of 24.90% of a feldspathic phase (orthoclase), as flotation tails.
Eleazar Salinas-Rodriguez; Javier Flores-Badillo; Juan Hernandez-Avila; Eduardo Cerecedo-Saenz; Ma. Del Pilar Gutierrez-Amador; Ricardo I. Jeldres; Normam Toro. Assessment of Silica Recovery from Metallurgical Mining Waste, by Means of Column Flotation. Metals 2020, 10, 72 .
AMA StyleEleazar Salinas-Rodriguez, Javier Flores-Badillo, Juan Hernandez-Avila, Eduardo Cerecedo-Saenz, Ma. Del Pilar Gutierrez-Amador, Ricardo I. Jeldres, Normam Toro. Assessment of Silica Recovery from Metallurgical Mining Waste, by Means of Column Flotation. Metals. 2020; 10 (1):72.
Chicago/Turabian StyleEleazar Salinas-Rodriguez; Javier Flores-Badillo; Juan Hernandez-Avila; Eduardo Cerecedo-Saenz; Ma. Del Pilar Gutierrez-Amador; Ricardo I. Jeldres; Normam Toro. 2020. "Assessment of Silica Recovery from Metallurgical Mining Waste, by Means of Column Flotation." Metals 10, no. 1: 72.
This paper describe the influence of the Rift Molango during the mineralization of elements of the platinum group and some light rare earths elements in a sedimentary exhalative ore deposit.
Edgar A. Cardenas-Reyes; Eleazar Salinas-Rodríguez; Juan Hernández-Ávila; Ventura Rodríguez-Lugo; Ma. Pilar Gutierrez-Amador; Edmundo Roldan-Contreras; Eduardo Cerecedo-Sáenz. Influence of the Rift Molango over the mineralization of platinum group elements and light rare earths into a sedimentary exhalative ore deposit. 2019, 1 .
AMA StyleEdgar A. Cardenas-Reyes, Eleazar Salinas-Rodríguez, Juan Hernández-Ávila, Ventura Rodríguez-Lugo, Ma. Pilar Gutierrez-Amador, Edmundo Roldan-Contreras, Eduardo Cerecedo-Sáenz. Influence of the Rift Molango over the mineralization of platinum group elements and light rare earths into a sedimentary exhalative ore deposit. . 2019; ():1.
Chicago/Turabian StyleEdgar A. Cardenas-Reyes; Eleazar Salinas-Rodríguez; Juan Hernández-Ávila; Ventura Rodríguez-Lugo; Ma. Pilar Gutierrez-Amador; Edmundo Roldan-Contreras; Eduardo Cerecedo-Sáenz. 2019. "Influence of the Rift Molango over the mineralization of platinum group elements and light rare earths into a sedimentary exhalative ore deposit." , no. : 1.
Morphological, chemical and mineralogical characterization of inorganic raw materials (pumicite and heavy clay) was carried out by SEM-EDS, XRF and XRD. It was found that pumicite shows the following composition; 71.78% SiO2, 14.83% Al2O3, 2.57% Fe2O3, 2.32% FeO, 2.37% Na2O, 4.12% K2O, 1.51% CaO and 0.5% P2O5. The major phase corresponds to Sanidine and as minor phases are Berlinite, Alkaline calcium and sodium ferritesilicoaluminate and Tridymite. For heavy clay, there was a chemical composition of 63.0% SiO2, 19.9% Al2O3, 6.2% Fe2O3, 1.5% Na2O, 2.1% K2O, 3.9% CaO, 2.5% MgO and 0.9% TiO2. Also are present in some contents of Illite, Kaolinite and Tridymite; Quartz, Hematite, Vermiculite and Montmorillonite are presented as minor phases. Additionally, the Atterberg number and the thixotropy were determined to heavy clay, finding values of 31.31 ± 9.45% and 2.87 ± 1.64%, respectively.
Javier Flores-Badillo; Adriana Rojas-León; Alma Delia Román-Gutiérrez; Juan Hernández-Ávila; Eleazar Salinas-Rodríguez; Christhopher Contreras López. Innovation of Building Materials: Ecological Bricks, Characterization of Complementary Inorganic Raw Materials. Proceedings of the International Conference on Martensitic Transformations: Chicago 2019, 683 -692.
AMA StyleJavier Flores-Badillo, Adriana Rojas-León, Alma Delia Román-Gutiérrez, Juan Hernández-Ávila, Eleazar Salinas-Rodríguez, Christhopher Contreras López. Innovation of Building Materials: Ecological Bricks, Characterization of Complementary Inorganic Raw Materials. Proceedings of the International Conference on Martensitic Transformations: Chicago. 2019; ():683-692.
Chicago/Turabian StyleJavier Flores-Badillo; Adriana Rojas-León; Alma Delia Román-Gutiérrez; Juan Hernández-Ávila; Eleazar Salinas-Rodríguez; Christhopher Contreras López. 2019. "Innovation of Building Materials: Ecological Bricks, Characterization of Complementary Inorganic Raw Materials." Proceedings of the International Conference on Martensitic Transformations: Chicago , no. : 683-692.
The objective of this work was to carry out a double chemical modification in rice starch: the first modification was acid hydrolysis optimization as a preparatory step for the second modification, which consisted of phosphating. For the optimization of the acid hydrolysis process, the independent variables hydrolysis time (h) and acid concentration (N) were evaluated. We obtained the estimated coefficients of the adjusted model and significance for the responses of viscosity profile (Vmax), water solubility index (WSI), water absorption index (WAI), onset temperature (To), peak temperature (Tp) and ending temperature (Te). The values predicted by the model for the hydrolysis optimization process were time 2 h and 1.2 N for HCI concentration. The starch obtained after the hydrolysis process was modified with sodium tripolyphosphate and characterized. Phosphate starches were obtained with degrees of substitution of 0.012 to 0.019 and showed good functional and physicochemical properties.
Enaim Aída Vargas-León; Reyna Nallely Falfan Cortes; Ricardo Omar Navarro-Cortez; Juan Hernández Avila; Javier Castro-Rosas; Carlos Alberto Gómez-Aldapa. Double chemical modification in rice starch: acid hydrolysis optimization process and phosphating. CyTA - Journal of Food 2019, 17, 632 -639.
AMA StyleEnaim Aída Vargas-León, Reyna Nallely Falfan Cortes, Ricardo Omar Navarro-Cortez, Juan Hernández Avila, Javier Castro-Rosas, Carlos Alberto Gómez-Aldapa. Double chemical modification in rice starch: acid hydrolysis optimization process and phosphating. CyTA - Journal of Food. 2019; 17 (1):632-639.
Chicago/Turabian StyleEnaim Aída Vargas-León; Reyna Nallely Falfan Cortes; Ricardo Omar Navarro-Cortez; Juan Hernández Avila; Javier Castro-Rosas; Carlos Alberto Gómez-Aldapa. 2019. "Double chemical modification in rice starch: acid hydrolysis optimization process and phosphating." CyTA - Journal of Food 17, no. 1: 632-639.
El enorme auge en la producción y consumo de aparatos eléctricos y electrónicos debidos a nuevas y mejores tecnologías, genera equipos con una menor vida útil consolidándolo como el flujo de residuos de mayor crecimiento a nivel mundial lo cual tiene como consecuencias problemáticas de carácter ambiental y de salud humana. Sin embargo, estos desechos contienen una gran cantidad de metales nobles, fundamentado en que cada placa de circuito impreso (presenta de 0.1 a 0.5 gramos de oro, frente a una extracción de 1 a 5 gramos de oro por tonelada de mineral. Teniendo en cuenta estos datos, la recuperación metálica de la chatarra electrónica por diversos procesos ha sido considerada como una fuente secundaria comercialmente viable de extracción de metales. Previamente a una recuperación de metales, es importante conocer las cantidades representativas de metales específicos contenidos en los desechos electrónicos. Es por ello que en este trabajo de investigación se llevó a cabo una amplia caracterización cualitativa, cuantitativa y semicuantitativa de materiales de desechos de equipos de cómputo de diferentes épocas, identificando componentes ricos en oro; utilizando técnicas como Difracción de Rayos X, Microscopia Electrónica de Barrido en conjunto con Microanálisis por Dispersión de Energías y Espectroscopía de Plasma de Acoplamiento Inducido. Como resultado se obtuvieron concentraciones máximas de oro del 99.4 % en peso en pines soportados en el procesador.
Abner Hesli Rojas Calva; María Isabel Reyes Valderrama; Ventura Rodriguez Lugo; Eleazar Salinas Rodriguez; Juan Hernandez Ávila; Eduardo Cerecedo Sáenz. Caracterización y estudio de la composición de oro presente en la chatarra electrónica. Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 2018, 6, 1 .
AMA StyleAbner Hesli Rojas Calva, María Isabel Reyes Valderrama, Ventura Rodriguez Lugo, Eleazar Salinas Rodriguez, Juan Hernandez Ávila, Eduardo Cerecedo Sáenz. Caracterización y estudio de la composición de oro presente en la chatarra electrónica. Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI. 2018; 6 (11):1.
Chicago/Turabian StyleAbner Hesli Rojas Calva; María Isabel Reyes Valderrama; Ventura Rodriguez Lugo; Eleazar Salinas Rodriguez; Juan Hernandez Ávila; Eduardo Cerecedo Sáenz. 2018. "Caracterización y estudio de la composición de oro presente en la chatarra electrónica." Pädi Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 6, no. 11: 1.
In this study, four samples of recycled aggregates from the construction and demolition waste of Mexico City were characterized in order to find innovative uses for these types of materials. Gravel and sand from a recycling plant were analyzed, as well as aggregates produced in the laboratory from demolished concrete collected from landfills. The characterization was carried out by means of XRD (X-ray Diffraction), chemical microanalysis (EDS), X-ray fluorescence (XRF), pH measurement, and sieve analysis. The minerals present in the analyzed materials were feldspars, cristobalite and pyroxene, which corresponded to the natural aggregates, as well as variable amounts of calcite, a product of the carbonation of the cement paste adhered to these aggregates, and in a smaller proportion, calcium hemicarboaluminate, rosenhanite, and tobermorite. The quality (amount of cement) of the original concrete has a great influence on the granulometry and the chemical–mineralogical composition of the aggregates, since there will be different quantities and qualities of the cement paste adhered to the aggregates depending on their size. Finally, the pH values measured in all samples fluctuated between 10.15 and 12.08, suggesting that these materials can be used in soil stabilization or in agricultural applications.
Emiliano Moreno-Pérez; Juan Hernández-Ávila; Yamile Rangel-Martínez; Eduardo Cerecedo-Sáenz; Alberto Arenas-Flores; Ma. Isabel Reyes-Valderrama; Eleazar Salinas-Rodriguez. Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City. Minerals 2018, 8, 237 .
AMA StyleEmiliano Moreno-Pérez, Juan Hernández-Ávila, Yamile Rangel-Martínez, Eduardo Cerecedo-Sáenz, Alberto Arenas-Flores, Ma. Isabel Reyes-Valderrama, Eleazar Salinas-Rodriguez. Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City. Minerals. 2018; 8 (6):237.
Chicago/Turabian StyleEmiliano Moreno-Pérez; Juan Hernández-Ávila; Yamile Rangel-Martínez; Eduardo Cerecedo-Sáenz; Alberto Arenas-Flores; Ma. Isabel Reyes-Valderrama; Eleazar Salinas-Rodriguez. 2018. "Chemical and Mineralogical Characterization of Recycled Aggregates from Construction and Demolition Waste from Mexico City." Minerals 8, no. 6: 237.
This work presents a study to obtain α-Al2O3 from thermal treatment of the precursor α-Al(OH)3Al(OH)3 (bayerite). The precursor was prepared from a cathodic electrosynthesis employing direct current (DC) and alternating current (AC) electrochemical techniques and using an aluminium solution prepared with scrap aluminium cans. Characterization techniques including X-ray diffraction (XDR), scanning electron microscopy (SEM) and thermogravimetric analysis (TG) were used to analyse the thermal behaviour, phase transformation, morphology and particle size of the products obtained. The range of potentials for electrodeposition was between −2.0 to 2.4 V with both DC and AC techniques. The presence of crystalline bayerite in the deposits obtained during all DC and AC experiments was observed, although a species of aluminium oxide (Al2.427O3.64) with AC was also identified. The surface morphology of the deposit with DC presented a compact uniform film, whereas with AC a granular form morphology with compact grains in the order of 1–3 μm was evident. In addition, the formation of an amorphous and low crystallinity bayerite precipitate was obtained from the solution, which presented a surface morphology of non-uniform fine grains and agglomerates. The thermal behaviour (TG) indicates three regions of change in the phase, which were verified via the thermal treatment; a transition of bayerite to η-Al2O3 in a temperature range between 290 and 300 ° C and subsequently to α-Al2O3 at a temperature of 1100 °C was determined. The α-Al2O3 presents high purity, a surface morphology with fine grains and agglomerates in the order of 1–10 μm and an appreciable porosity.
J.C. García-Mayorga; G. Urbano-Reyes; M.A. Veloz-Rodríguez; V.E. Reyes-Cruz; José Angel Cobos-Murcia; Juan Hernández Avila; M. Pérez-Labra. Electrochemical preparation of precursor phases for obtaining alpha-alumina from aluminium scrap. Ceramics International 2018, 44, 7435 -7441.
AMA StyleJ.C. García-Mayorga, G. Urbano-Reyes, M.A. Veloz-Rodríguez, V.E. Reyes-Cruz, José Angel Cobos-Murcia, Juan Hernández Avila, M. Pérez-Labra. Electrochemical preparation of precursor phases for obtaining alpha-alumina from aluminium scrap. Ceramics International. 2018; 44 (7):7435-7441.
Chicago/Turabian StyleJ.C. García-Mayorga; G. Urbano-Reyes; M.A. Veloz-Rodríguez; V.E. Reyes-Cruz; José Angel Cobos-Murcia; Juan Hernández Avila; M. Pérez-Labra. 2018. "Electrochemical preparation of precursor phases for obtaining alpha-alumina from aluminium scrap." Ceramics International 44, no. 7: 7435-7441.
This work shows the preliminary description of the origin of a sedimentary - exhalative outcrop of Jurassic Lower Pliensbachian. The location of this deposit was achieved by applying an examination based in the identification of sedimentary transgressions of heterochronies ages and the identification of a Rift – type mega –structure. According with the methodology, it was carried out a study of the discordant relationships between two types of sediments: continental and marine. According the characterization, it was noted the existence of light rare earths, in values that show positive anomalies in comparison with the distribution of elements in upper continental crust according to the Clarke [1], reflecting so a felsic affinity of the mineral deposit. Also, positive anomalies of platinum and Pd, were determined with marginal contents of Au and Ag; and finally the base metals Zn, Pb and Cu were detected in low contents, which could be due to the presence of altered shale. According to the sedimentary lithology found, which was of siliciclastic type; to the exhalative roots observed during the fieldwork; the presence of quartz minerals such as biotite and muscovite; the presence of minerals of hydrothermal remobilization like chalcopyrite with some base metals, altered shale, as well as sulfur deficiency; this mineral reservoir could be defined as a SEDEX – type.
Eduardo Cerecedo-Sáenz; Ventura Rodríguez-Lugo; Juan Hernández-Ávila; Demetrio Mendoza-Anaya; Ma. Isabel Reyes-Valderrama; Rosa A. Vázquez-García; Eleazar Salinas-Rodríguez. Preliminary Description of the Origin of a Sedimentary – Exhalative Ore Deposit, in Molango, Hidalgo Mexico. 2018, 1 .
AMA StyleEduardo Cerecedo-Sáenz, Ventura Rodríguez-Lugo, Juan Hernández-Ávila, Demetrio Mendoza-Anaya, Ma. Isabel Reyes-Valderrama, Rosa A. Vázquez-García, Eleazar Salinas-Rodríguez. Preliminary Description of the Origin of a Sedimentary – Exhalative Ore Deposit, in Molango, Hidalgo Mexico. . 2018; ():1.
Chicago/Turabian StyleEduardo Cerecedo-Sáenz; Ventura Rodríguez-Lugo; Juan Hernández-Ávila; Demetrio Mendoza-Anaya; Ma. Isabel Reyes-Valderrama; Rosa A. Vázquez-García; Eleazar Salinas-Rodríguez. 2018. "Preliminary Description of the Origin of a Sedimentary – Exhalative Ore Deposit, in Molango, Hidalgo Mexico." , no. : 1.