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Efficient removal of the recalcitrant metamizole contaminant from drinking water by using a CaLaCoO_(9) perovskite supported on recycled polyethylene

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Journal of Environmental Sciences 2024年第2期136卷 56-67页

作者： Ernesto Valadez-Renteria Christian Perez-Carrasco dulce Yolotzin medina-Velazquez Vicente Rodriguez-Gonzalez Jorge Oliva CONACYT-División de Materiales Avanzados Instituto Potosino de Investigación Científica y Tecnológica A.C.San Luis PotosíSLP 78216México División de Ciencias Básicas e Ingeniería Universidad Autónoma Metropolitana AzcapotzalcoCol.Reynosa-TamaulipasC.P.MéxicoDF 02200México

Metamizole(MZ)is a widely used anti-inflammatory *** to its common use,this contaminant is found in sewage and *** order to reduce the contamination produced by the MZ,we fabricated in this work a photocatalytic composite using recycled polyethylene(RPE)and the CaLaCoO_(9)(LCCO)*** nanoparticles had a microplate-like morphology and sizes of 1.4–5.5μm according to the analysis of *** photocatalytic properties of the LCCO powders were evaluated under ultraviolet-visible(UV-Vis)irradiation and found a removal efficiency of 96%.When the RPE+LCCO composite was employed for the photocatalytic degradation of MZ,a maximum degradation of 92.5%was *** influence of the pH on the photocatalytic activity was also studied and found that an initial pH=3 produced a total degradation of MZ after 240 min of UV-Vis ***,three reuse cycles were carried out for the pure LCCO powders and for the RPE+LCCO composites and found that the maximum loss of degradation was 5%.Furthermore,scavenger experiments demonstrated that the super oxide and hydroxyl radicals are formed during the photocatalytic reaction and were responsible for the degradation of ***,the X-ray photoelectron-spectroscopy and Raman analysis demonstrated the formation of defects(oxygen vacancies),those ones delayed the electron-hole recombination,which in turn,enhanced the degradation of the ***,the studies performed in this work proved that composites made with recycled plastics and LCCO perovskites are a low-cost and feasible alternative for the cleaning of water sources polluted with pharmaceutical compounds.

关键词： Photocatalysis Metamizole Pharmaceutical contaminant UV-Vis irradiation Perovskite

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Bubbling to Jetting Transition during Argon Injection in Molten Steel

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World Journal of Engineering and Technology 2020年第4期8卷 605-616页

作者： Miguel A. Barron Joan Reyes dulce Y. medina Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

Bubbling to Jetting Transition is of the outmost importance in metallurgical processes given that the flow regime influences the refining rates, the refractory erosion, and the blockage of injection nozzles. Bubbling to jetting transition during subsonic bottom injection of argon in molten steel is studied here. The effect of the molten steel height, the injection velocity, the nozzle diameter, and the molten steel viscosity on the jet height and the bubbling to jetting transition is numerically analyzed using Computational Fluid Dynamics. Five subsonic argon injection velocities are considered: 5, 25, 50, 100 and 150 m/s. Three values of the metal height are taken into account, namely 1.5 m, 2 m and 2.5 m. Besides, three values of the nozzle diameters are considered: 0.001 m, 0.005 m and 0.01 m. Finally, three values of the molten steel viscosity are supposed: 0.0067, 0.1 and 1 kg/(m·s). It is observed that for the argon-molten steel system, the bubbling to jetting transition occurs for an injection velocity less than 25 m/s and that for the range of viscosities considered, the molten steel viscosity does not exert significant influence on the jet height and the bubbling to jetting transition. Due to the jet instability at subsonic velocities, a second transition, namely jetting to bubbling, is appreciated.

关键词： Argon Injection Bubbling to Jetting Transition CFD Injection Velocity Jet Height Molten Steel Nozzle Diameter

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A Straightforward Mathematical Model of Hot Metal Desulphurization

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Open Journal of Applied Sciences 2020年第6期10卷 318-327页

作者： Miguel A. Barron dulce Y. medina Joan Reyes Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

A straightforward kinetic model for the hot metal desulphurization process is presented. The model contains some of the most important parameters and variables that govern the process. The inputs, outputs and parameters of a desulphurization program employed at industry are discussed. The model is able to cope with different injection policies of desulphurizers such as mono- injection, co-injection or multi-injection. When compared to the rotary impeller method, results of this model shows that the weight of lime consumed in the lance injection method is lesser than that consumed in the rotary impeller method for the same conditions of the hot metal charge.

关键词： Desulphurization Hot Metal Kinetic Model Lance Injection Rotary Impeller

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Uniform Flow of Molten Metals in Rectangular Open Channels

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World Journal of Engineering and Technology 2022年第3期10卷 518-526页

作者： Miguel A. Barron Joan Reyes dulce Y. medina Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

The flow of liquids in open channels has been studied since ancient Rome. However, the vast majority of published reports on flow in open channels are focused on the transport of drinking water and sewage disposal. The literature on the transport of molten metals in open channels is quite scarce. In this work, the uniform flow of pig iron and molten aluminum in rectangular open channels is studied. Specific energy curves are constructed and critical heights are analytically determined. The transition from subcritical to supercritical flow is analyzed as a function of the angle of inclination of the channel and the roughness of its walls. Manning’s equation is applied to the pig iron flow using data reported in the literature for molten aluminum. The need to correct the roughness coefficient for pig iron is observed in order to obtain results consistent with those previously reported.

关键词： Critical Height Froude Number Molten Metal Flow Open Channel Rectangular Channel Uniform Flow

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Interaction between a Liquid Surface and an Impinging Gas Jet

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World Journal of Engineering and Technology 2021年第4期9卷 793-803页

作者： Miguel A. Barron dulce Y. medina Joan Reyes Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

The water-air and Wood’s metal-air systems are modeled by means of Computational Fluid Dynamics to study the interaction between a liquid surface and an impinging air jet under the near field blowing conditions. The effect of the air jet velocity, the height of the injection lance, and the density of the liquid on the depth of the formed cavity is numerically studied. The CFD results of the cavity depth are compared with results previously reported by other authors. The emergence of the splashing phenomenon is predicted in terms of the critical velocity for each liquid-air system. Besides, the blowing number indicates that the drop generation rate is not significant for jet velocities below the critical velocity, and therefore neither the splashing is significant.

关键词： Cavity Depth CFD Impinging Gas Jet Lance Height Liquid-Gas Interaction Splashing

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Analysis of Molten Metal Distribution in the Mold of a Horizontal Centrifugal Casting

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Open Journal of Applied Sciences 2020年第7期10卷 444-454页

作者： Miguel A. Barron dulce Y. medina Joan Reyes Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Mexico City Mexico

It is numerically studied the influence of the angular velocity, the molten metal viscosity, and the mold wall roughness on the molten metal distribution in the mold of a horizontal centrifugal casting process. The undesirable raining phenomenon sometimes arises in horizontal centrifugal casting. It occurs when the molten metal rains or falls from the top of the mold to the bottom while the mold is rotating. Using Computational Fluid Dynamics simulations, the conditions for the emergence of the raining phenomenon were explored in this work. For the system considered, angular velocities less than 77 rad/s cause the emergence of the raining phenomenon and accumulation of the molten metal in the lower part of the mold, whereas angular velocities greater than 77 rad/s produce a constant thickness of the molten metal and prevent raining.

关键词： Angular Velocity Centrifugal Casting Computational Fluid Dynamics Molten Metal Viscosity Wall Roughness

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Energy Transfer among Modes in a Non-Slender Elastic Beam Subject to Vortex-Induced Vibration

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Computer Technology and Application 2013年第5期4卷 266-270页

作者： Miguel A. Barron dulce medina Isaias Hilerio Departamento de Materiales Universidad Autonoma Metropolitana Azcapotzalco Col. Reynosa-Tamaulipas Mexico 02200 Mexico

The vibration of an elastic beam experiencing vortex-induced vibration is numerically analyzed employing a wake-oscillator model. The influence of the excited mode, the initial velocity, the shedding pulsation and the mass ratio on the energy transfer among modes and the vibration amplitude is determined. Multiple frequencies are detected, and the power spectral density of the beam tip time series is used to calculate the dominant frequency.

关键词： Elastic beam energy transfer fluid-structure problem power spectral density vibration modes vortex-induced vibration wake-oscillator model.

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Collective Behavior of a Ring of Van Der Pol Oscillators under Gaussian and Random Coupling Schemes

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Open Journal of Applied Sciences 2014年第7期4卷 383-391页

作者： Miguel A. Barron dulce Y. medina Isaias Hilerio Departamento de Materiales Universidad Autonoma Metropolitana-Azcapotzalco Mexico D.F. Mexico

The collective behavior of a ring of coupled identical van der Pol oscillators is numerically studied in this work. Constant, gaussian and random distributions of the coupling parameter along the ring are considered. Three values of the oscillators constant are assumed in order to cover from quasilinear to nonlinear dynamic performance. Single and multiple coupled frequencies are obtained using power spectra of the long term time series. Phase portraits are obtained from numerical simulations, and the coupled behavior is analyzed, compared and discussed.

关键词： Coupled Oscillators Coupling Parameter Gaussian Distribution Oscillators Ring Random Distribution Van Der Pol Oscillator

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Numerical Simulation of Decarburization in a Top-Blown Basic Oxygen Furnace

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Modeling and Numerical Simulation of Material Science 2014年第3期4卷 94-103页

作者： Miguel A. Barron dulce Y. medina Isaias Hilerio Departamento de Materiales Universidad Autonoma Metropolitana-Azcapotzalco Mexico City Mexico

An improved mathematical model to describe the decarburization process in basic oxygen furnaces for steelmaking is presented in this work. This model takes into account those factors or parameters that determine the bath-oxygen impact area, such as the cavity depth, the lance height, the number of nozzles and the nozzles diameter. In the thermal issue, the model includes the targeted carbon content and temperature. The model is numerically solved, and is validated using reported data plant. The oxygen flow rate and the lance height are varied in the numerical simulations to study their effect on the carbon content and decarburization rate.

关键词： Basic Oxygen Furnace Carbon Content Decarburization Lance Height Numerical Simulation Oxygen Flow Rate Oxygen Steelmaking

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Modeling and Simulation of Hot Metal Desulfurization by Powder Injection

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Open Journal of Applied Sciences 2015年第6期5卷 295-303页

作者： Miguel A. Barron Isaias Hilerio dulce Y. medina Departmento de Materiales Universidad Autonoma Metropolitana Azcapozalco Mexico City Mexico

The desulfurization of hot metal by the mono-injection of lime powder and the co-injection of lime, calcium carbide and magnesium powders is mathematically modeled. The mono-injection model is derived from the continuity equation and is validated using experimental results and data previously reported in the literature. The co-injection model and the rate constant of the injected mixture are determined from the molar fractions and rate constants of the individual powders. The effect of the lime content of the mixture on the desulfurization dynamics is studied and discussed.

关键词： CFD Simulation Co-Injection Desulfurization Hot Metal Desulfurization Lime Injection Powder Mono-Injection Powder Desulfurization

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