Saltillo Institute of Technology
Saltillo, Mexico

The Technological Institute of Saltillo , or ITS, is located in the city of Saltillo, state capital of Coahuila, Mexico. It is a college level technological institution. Though founded in July 1950 by Mexican President Miguel Alemán Valdez, it started operations on January 3, 1951. Wikipedia.

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Parga J.R.,Saltillo Institute of Technology | Gonzalez G.,Saltillo Institute of Technology | Moreno H.,Institute of Chemical Technology | Valenzuela J.L.,University of Sonora
Desalination and Water Treatment | Year: 2012

In this research we present and discuss the results of the use of the Electrocoagulation (EC) process for strontium removal from wastewater. The phenomena associated with strontium removal is adsorption on iron magnetic species generated from the dissolution of iron electrodes of the electrolytic cell. With the EC process more than 99 percent of strontium was removed from wastewater without addition of chemical reagents. Sludge generated by EC was characterized by Chemical Analyses, X-Ray Diffraction, Scanning Electron Microscopy and Vibrating Sample Magnetometer (VSM) in order to document the adsorption of strontium on iron-species. The electrogenerated crystalline iron oxides magnetite (Fe3O4) and maghemite (γ-Fe2O3) powders have higher values for saturation magnetization, but lower values for rema-nent magnetization and coercive field than commercial strontium hexaferrite with micrometric particle size. The experimental data were correlated employing a Langmuir adsorption isotherm. Thermodynamic parameters such as ΔG°, ΔH° and ΔS° were evaluated (ΔG°= -23.49 KJ/mol, ΔH° = -24.92 KJ/mol and ΔS° = -0.00479 KJ/mol K) and the adsorption process was found to be exothermic and spontaneous in nature. In addition, results indirectly indicate the feasibility of the EC process for strontium removal. © 2012 Desalination Publications. All rights reserved.

Parga J.R.,Saltillo Institute of Technology | Vazquez V.,Saltillo Institute of Technology | Gonzalez G.,Saltillo Institute of Technology | Cisneros M.M.,Saltillo Institute of Technology
Chemical Engineering and Technology | Year: 2010

The protection of the global environment and in particular, the provision of a sustainable source of clean water is a necessity for human survival. Specifically, large quantities of chromium containing compounds are being discharged into the environment. This study has been carried out to determine the feasibility of chromium adsorption on iron species by an Electrocoagulation (EC) process using the Langmuir Isotherm. The full potential of EC with air injection as an alternative wastewater treatment technique to remove chromium from well water shows more than 99 % removal without the addition of any chemical reagents. In this study, X-Ray Diffraction, Scanning Electron Microscopy, Mössbauer Spectroscopy and Fourier Transform Infrared Spectroscopy are used to characterize the solid products that reveal the expected crystalline iron oxides, i.e., lepidocrocite, magnetite, gohetite, and iron oxide. The feasibility of chromium adsorption on iron species by an electrocoagulation (EC) process is demonstrated. It is believed that EC produces magnetic particles of magnetite and amorphous iron oxyhydroxide that can be used to remove chromium species. A pilot plant system should remove chromium from contaminated well waters very effectively. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Haro-Rodriguez S.,Autonomous University of Zacatecas | Goytia-Reyes R.E.,Autonomous University of Zacatecas | Dwivedi D.K.,Indian Institute of Technology Roorkee | Baltazar-Hernandez V.H.,Autonomous University of Zacatecas | And 2 more authors.
Materials and Design | Year: 2011

In this paper, the influence of grain refinement (Al-5Ti-1B) and modification (Al-10Sr) on the microstructure, the morphology of iron-containing needle shape beta phase and mechanical properties of cast Al-12Si alloy has been reported. The grain refinement and modification transforms the needle shape morphology of the β-phase into Chinese script. Grain refinement and modification by addition of Ti and Sr respectively increased the quality index (Q) of the casting. Addition of 0.06. wt.% Sr resulted in a best combination of mechanical properties such as ultimate tensile strength and ductility. © 2010 Elsevier Ltd.

De Leon-Quiroz E.L.,Research Center en Quimica Aplicada | De Leon-Quiroz E.L.,Saltillo Institute of Technology | Puente-Urbina B.A.,Research Center en Quimica Aplicada | Vazquez-Obregon D.,Saltillo Institute of Technology | Garcia-Cerda L.A.,Research Center en Quimica Aplicada
Materials Letters | Year: 2013

Bimetallic CuxNi100-x nanoalloys (x=20, 40, 50, 60 and 80) were prepared by the polymeric precursor method using citric acid as chelating agent and ethylene glycol as polymerizing agent. CuNi nanoalloys were obtained after calcination in H2/N2 atmosphere at 600°C for 15 min. The different products were characterized by thermal analysis (TGA/DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and atomic absorption analysis (AAS). The XRD patterns show the formation of a single fcc structure, characteristic of well crystalline CuNi nanoalloys. TEM studies show nearly spherical nanoparticles with average size of 45 nm. © 2012 Elsevier B.V. All rights reserved.

Pech-Canul M.I.,CINVESTAV | Rodriguez-Reyes M.,Saltillo Institute of Technology | Pech-Canul M.A.,CINVESTAV | Rendon-Angeles J.C.,CINVESTAV
Metals and Materials International | Year: 2011

In this work, SiCP and SiC P/SiO 2 porous preforms were infiltrated without assistance in Ar?N2 atmosphere with the alloy Al-10.3 Mg-12.04 Si (wt.%) at 1050 and 1100 °C, for 20, 40 and 60 min. It was found that a decrease in residual porosity and an increase in elastic modulus by about 22 % with respect to composites produced without SiO 2 additions to the preforms are associated with the formation of magnesium aluminate spinel (MgAl 2O 4). A concurrent increase of the matrix hardness is ascribed to a strengthening mechanism by MgAl 2O 4 formation, similar to the strengthening observed with Mg 2Si in aluminum alloys. Therefore, the spinel can be considered as a co-reinforcement of SiC p in the aluminum matrix composites. Reactions for spinel formation and possible mechanisms for hardness enhancement are outlined. © KIM and Springer.

Estrada-Ruiz R.H.,Saltillo Institute of Technology | Flores-Campos R.,Saltillo Institute of Technology | Gamez-Altamirano H.A.,Saltillo Institute of Technology | Velarde-Sanchez E.J.,Saltillo Institute of Technology
Journal of Hazardous Materials | Year: 2016

The generation of electrical and electronic waste is increasing day by day; recycling is attractive because of the metallic fraction containing these. Nevertheless, conventional techniques are highly polluting. The comminution of the printed circuit boards followed by an inverse flotation process is a clean technique that allows one to separate the metallic fraction from the non-metallic fraction. It was found that particle size and superficial air velocity are the main variables in the separation of the different fractions. In this way an efficient separation is achieved by avoiding the environmental contamination coupled with the possible utilization of the different fractions obtained. © 2016 Elsevier B.V.

Ruizmoreno R.G.,CINVESTAV | Ruizmoreno R.G.,Saltillo Institute of Technology | Martinez A.I.,CINVESTAV | Castro-Rodriguez R.,CINVESTAV | Bartolo P.,CINVESTAV
Journal of Superconductivity and Novel Magnetism | Year: 2013

Citrate coated magnetite nanoparticles (NPs) were prepared by a modified coprecipitation technique in the presence of sodium citrate and sodium acetate. The citrate coated NPs showed a close particle size distribution, superparamagnetic behavior, and single crystalline nature. Water dispersions of magnetite NPs were analyzed by laser diffraction; this technique revealed that the NPs form micrometer sized aggregates. It was found that the size of the aggregates depends strongly on the time of ultrasonic agitation and the citrate shell. © 2012 Springer Science+Business Media New York.

Moreno H.,Institute of Chemical Technology | Parga J.R.,Saltillo Institute of Technology | Gomes A.J.,Lamar University | Rodriguez M.,Saltillo Institute of Technology
Desalination and Water Treatment | Year: 2013

One of the biggest challenges of the twenty-first century is to provide water, primarily potable, to the majority of the world population. This is a critical issue, especially in developing countries. One way to augment that effort is to reuse water. Currently, some emerging wastewater treatment technologies based on electrochemistry (e.g. electrocoagulation (EC), electroflotation, electrodecantation, and electrooxidation) are available that are competitive and advantageous over conventional technologies. Although EC has been known for more than a century, it has not been comprehensively studied. EC has been commercialized for the removal of specific contaminants and wastewater treatment. This work demonstrates EC as an alternative method for the treatment of municipal wastewater in Torreon; Coah, Mexico. COD value for wastewater in Torreon is considered as medium level (245 ppm). Experiments were conducted to determine the optimum operational conditions. Results show a remarkable removal efficiency for: Chemical Oxygen Demand (COD) 77-94%; and also for coliforms 80%, and colony forming units (CFU) 99.98% within 30 s of residence time. © 2013 Balaban Desalination Publications.

Deaquino-Lara R.,CIMAV | Deaquino-Lara R.,CINVESTAV | Gutierrez-Castaneda E.,CINVESTAV | Estrada-Guel I.,CIMAV | And 5 more authors.
Materials and Design | Year: 2014

The modification on the microstructure and mechanical response of some Al7075-graphite composites fabricated by mechanical alloying and hot extrusion were studied as a direct function of milling time (0-10h) and graphite concentration (0-1.5wt.%). The experimental results show that the mechanical properties of the resulting composites are enhanced by increasing both the milling time and the graphite content. This effect is attributed mainly to grain size refining, Al4C3 phase formation and an increase of the dislocation density. The yield strength of the hot-extruded samples varies with grain size according to the Hall-Petch relationship. During the hot-extrusion process, recrystallization of samples milled for 10h occurs faster than in samples with 5h of milling, which is associated to the increase of stored energy in the composites caused by the milling process. © 2013 Elsevier Ltd.

Valdes-Perezgasga M.T.,Posgrado en Ciencias Agrarias UAAAN UL | Sanchez-Ramos F.J.,Posgrado en Ciencias Agrarias UAAAN UL | Garcia-Martinez O.,Saltillo Institute of Technology | Anderson G.S.,Simon Fraser University
Journal of Forensic Sciences | Year: 2010

This is the first report of an ongoing research to establish a sarcosaprophagous arthropod database in the Coahuilan semidesert. Seven pigs (Sus scrofa L.) were used as human models to determine succession in an open urban area during the 2007 winter-spring period. Arthropods were collected manually and from pitfall traps. Carcass biomass loss, as well as arthropod colonization, was recorded during 71 days postmortem. Five decomposition stages were identified during which most abundant orders were found to be Diptera, Coleoptera, and Hymenoptera. Lucilia sericata (Meigen), Chrysomya rufifacies (Macquart), Necrobia rufipes (DeGeer), Dermestes maculatus (DeGeer), Pheidole hyatti Emery, and Pogonomyrmex rugosus Emery stood out as dominant species. © 2010 American Academy of Forensic Sciences.

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