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Magnetic nanoparticles (MNP) and silicon-decorated magnetic nanoparticles (SMNP) have been the object of interest in numerous industry fields as diverse as information storage, diagnostics and imaging, and water treatment thanks to their magnetic properties, which confer them the ability to navigate remotely to a specific location, retrieve material, and vibrate without harmful radiation. However, like all chemical agents, the nanoparticles require pinpoint regulations to ensure proper handling, use, and disposal once their use is finished. The human body's exposition can lead to unknown effects once these particles reach internal structures, like the vascular system. The results show that concentrations of MNP (1–1000 μg/ml) induced alteration on the cardiovascular physiology, on the cardiac contractility, and in the perfusion pressure. Parameters that also were associated with the alteration on nitric oxide (NO) levels, a free radical which regulate the vascular tone, effects displayed from the first administration of the lowest concentration derived from a sustained constriction, which also induced inhibition of the relaxation by the vasoactive substance acetylcholine (ACh), and the blockage of norepinephrine (NE), respectively.
Jesús R. Vargas-Ortíz; Harald N. Böhnel; Carmen Gonzalez; Karen Esquivel. Magnetic nanoparticle behavior evaluation on cardiac tissue contractility through Langendorff rat heart technique as a nanotoxicology parameter. Applied Nanoscience 2021, 1 -14.
AMA StyleJesús R. Vargas-Ortíz, Harald N. Böhnel, Carmen Gonzalez, Karen Esquivel. Magnetic nanoparticle behavior evaluation on cardiac tissue contractility through Langendorff rat heart technique as a nanotoxicology parameter. Applied Nanoscience. 2021; ():1-14.
Chicago/Turabian StyleJesús R. Vargas-Ortíz; Harald N. Böhnel; Carmen Gonzalez; Karen Esquivel. 2021. "Magnetic nanoparticle behavior evaluation on cardiac tissue contractility through Langendorff rat heart technique as a nanotoxicology parameter." Applied Nanoscience , no. : 1-14.
Nowadays, the use of different nanoscale structures has been introduced to a large number of research areas. One of these is the treatment and remediation of water through photocatalytic processes, seeking to reuse wastewater for agriculture. In this paper, Lactuca sativa, Coriandrum sativum, and Capsicum annuum were used as crop models to observe the effects in plant growth and the secondary metabolism of different water qualities and types used in the watering process. Initial results show that the photocatalytic process’s water maintains a pH and ion concentration within the allowed limits, significantly reducing the number of bacteria. Along the growth process, an influence on germination times, appearance of true leaves, maturation, and fruit production depending on the type of water used is observed, obtaining the best results in both growth times and quantity of fruits, for the 50% and 70% disinfected water/tap water (DW/TAW) study groups. Secondary metabolites, such as phenols, flavonoids, and antioxidant activity, were studied to evaluate changes in the vegetables’ composition, showing increased concentration for the disinfected water groups in most specimens. Additionally, no traces of metals and microorganisms were detected, concluding that the crops are viable to be consumed by human beings.
Aldo Cordoba; Rafael Hernández; Iliana Viveros-Palma; Sandra Mendoza; Ramón Gerardo Guevara-González; Ana Angélica Feregrino-Pérez; Karen Esquivel. Effect on plant growth parameters and secondary metabolite content of lettuce (Lactuca sativa L.), coriander (Coriandrum sativum), and chili pepper (Capsicum annuum L.) watered with disinfected water by Ag-TiO2 nanoparticles. Environmental Science and Pollution Research 2021, 1 -12.
AMA StyleAldo Cordoba, Rafael Hernández, Iliana Viveros-Palma, Sandra Mendoza, Ramón Gerardo Guevara-González, Ana Angélica Feregrino-Pérez, Karen Esquivel. Effect on plant growth parameters and secondary metabolite content of lettuce (Lactuca sativa L.), coriander (Coriandrum sativum), and chili pepper (Capsicum annuum L.) watered with disinfected water by Ag-TiO2 nanoparticles. Environmental Science and Pollution Research. 2021; ():1-12.
Chicago/Turabian StyleAldo Cordoba; Rafael Hernández; Iliana Viveros-Palma; Sandra Mendoza; Ramón Gerardo Guevara-González; Ana Angélica Feregrino-Pérez; Karen Esquivel. 2021. "Effect on plant growth parameters and secondary metabolite content of lettuce (Lactuca sativa L.), coriander (Coriandrum sativum), and chili pepper (Capsicum annuum L.) watered with disinfected water by Ag-TiO2 nanoparticles." Environmental Science and Pollution Research , no. : 1-12.
Among the different properties of the hydrophobic semiconductor surfaces, self-cleaning promoted by solar illumination is probably one of the most attractive from the technological point of view. The use of sonochemistry for nanomaterials' synthesis has been recently employed for the associated shorter reaction times and efficient route for control over crystal growth and the management of the resulting material's photocatalytic properties. Moreover, the sol–gel method coupled to sonochemistry modifies the chemical environment, with reactive species such as •OH and H2O2, which yield a homogeneous synthesis. Therefore, in the following investigation, the sol–gel method was coupled to sonochemistry to synthesize a [email protected] composite, for which the sonochemical amplitude of irradiation was varied to determine its effect on the morphology and mechanical and self-cleaning properties. SEM and AFM characterized the samples of [email protected] composite, and while the micrographs indicate that a high ultrasonic energy results in an amorphous [email protected] composite with a low rugosity, which was affected in the determination of the contact angle on the surface. On the other hand, FTIR analysis suggests a significant change in both SiO2-SiO and SiO2-TiO2 chemical bonds with changes in vibrations and frequency, corroborating an important influence of the sonochemical energy contribution to the hydrolysis process. Raman spectroscopy confirms the presence of an amorphous phase of silicon dioxide; however, the vibrations of TiO2 were not visible. The evaluation of hydrophobic and self-cleaning properties shows a maximum of ultrasonic energy needed to improve the contact angle and rhodamine B (RhB) removal.
A. Rosales; L. Ortiz-Frade; Iliana E. Medina-Ramirez; Luis A. Godínez; K. Esquivel. Self-cleaning of SiO2-TiO2 coating: Effect of sonochemical synthetic parameters on the morphological, mechanical, and photocatalytic properties of the films. Ultrasonics Sonochemistry 2021, 73, 105483 .
AMA StyleA. Rosales, L. Ortiz-Frade, Iliana E. Medina-Ramirez, Luis A. Godínez, K. Esquivel. Self-cleaning of SiO2-TiO2 coating: Effect of sonochemical synthetic parameters on the morphological, mechanical, and photocatalytic properties of the films. Ultrasonics Sonochemistry. 2021; 73 ():105483.
Chicago/Turabian StyleA. Rosales; L. Ortiz-Frade; Iliana E. Medina-Ramirez; Luis A. Godínez; K. Esquivel. 2021. "Self-cleaning of SiO2-TiO2 coating: Effect of sonochemical synthetic parameters on the morphological, mechanical, and photocatalytic properties of the films." Ultrasonics Sonochemistry 73, no. : 105483.
Titanium dioxide (TiO2) is a widely used and well studied photocatalyst synthesized using different methodologies, including sol-gel, which allows one to modify the material in a one-pot step. By using a microwave- and sonochemistry-assisted sol-gel method, x wt.% Au-TiO2 photocatalysts were successfully synthesized. Physicochemical characterization of the photocatalysts shows an average crystallite size of 10.5 nm and an even morphological distribution of spherical particles with the sonochemistry synthesis method. For the microwave method an average value of crystallite size of 8.3 nm was found and it presents an increase with the amount of Au load. The cyclic voltammetric response and Mott-Schottky analysis are consistent with a semiconductor material containing metallic particles and for a heterophase junction of anatase and brookite with oxygen vacancies, respectively. The photocatalytic activity was assessed by paracetamol degradation in an aqueous solution as model. The sonochemistry-synthesized photocatalysts display the most promising results as they have a better paracetamol removal and the amount of gold in the catalyst (0.7 wt.%) was found to be optimal for this process.
Rafael Hernández; José Rosendo Hernández-Reséndiz; Marisela Cruz-Ramírez; Rodrigo Velázquez-Castillo; Luis Escobar-Alarcón; Luis Ortiz-Frade; Karen Esquivel. Au-TiO2 Synthesized by a Microwave- and Sonochemistry-Assisted Sol-Gel Method: Characterization and Application as Photocatalyst. Catalysts 2020, 10, 1052 .
AMA StyleRafael Hernández, José Rosendo Hernández-Reséndiz, Marisela Cruz-Ramírez, Rodrigo Velázquez-Castillo, Luis Escobar-Alarcón, Luis Ortiz-Frade, Karen Esquivel. Au-TiO2 Synthesized by a Microwave- and Sonochemistry-Assisted Sol-Gel Method: Characterization and Application as Photocatalyst. Catalysts. 2020; 10 (9):1052.
Chicago/Turabian StyleRafael Hernández; José Rosendo Hernández-Reséndiz; Marisela Cruz-Ramírez; Rodrigo Velázquez-Castillo; Luis Escobar-Alarcón; Luis Ortiz-Frade; Karen Esquivel. 2020. "Au-TiO2 Synthesized by a Microwave- and Sonochemistry-Assisted Sol-Gel Method: Characterization and Application as Photocatalyst." Catalysts 10, no. 9: 1052.
Nanotechnology is a tool that in the last decade has demonstrated multiple applications in several sectors, including agroindustry. There has been an advance in the development of nanoparticulated systems to be used as fertilizers, pesticides, herbicides, sensors, and quality stimulants, among other applications. The nanoencapsulation process not only protects the active ingredient but also can affect the diffusion, interaction, and activity. It is important to evaluate the negative aspects of the use of nanoparticles (NPs) in agriculture. Given the high impact of the nanoparticulated systems in the agro-industrial field, this review aims to address the effects of various nanomaterials on the morphology, metabolomics, and genetic modification of several crops.
Luis A. Paramo; Ana A. Feregrino-Pérez; Ramón Guevara; Sandra Mendoza; Karen Esquivel. Nanoparticles in Agroindustry: Applications, Toxicity, Challenges, and Trends. Nanomaterials 2020, 10, 1654 .
AMA StyleLuis A. Paramo, Ana A. Feregrino-Pérez, Ramón Guevara, Sandra Mendoza, Karen Esquivel. Nanoparticles in Agroindustry: Applications, Toxicity, Challenges, and Trends. Nanomaterials. 2020; 10 (9):1654.
Chicago/Turabian StyleLuis A. Paramo; Ana A. Feregrino-Pérez; Ramón Guevara; Sandra Mendoza; Karen Esquivel. 2020. "Nanoparticles in Agroindustry: Applications, Toxicity, Challenges, and Trends." Nanomaterials 10, no. 9: 1654.
TiO2 is one of the most studied photocatalyst, however, in order to enhance the photocatalytic activity, several strategies for chemical or physical modifications have been reported. Among these strategies, microwave and sonochemistry assisted synthesis methods have been attracting attention due to the unique characteristics that can be achieved through it. Au–TiO2 nano powders were synthesized via microwave assisted sol–gel method (SG method) and sonochemistry assisted sol–gel method (SC method) with varying gold load, (containing 0.05, 0.1, 0.3, 0.7, 1.0, 3.0 and 5.0 wt% for SG method and 0.05, 0.1, 0.3, 0.7, 1.0 wt% for SC method). Subsequently, a calcination process was carried out at 450 °C for 3 h. Materials obtained were physicochemical analyzed by SEM, XPS, and XRD analysis. According to XRD analysis, the main crystalline phase of the materials was anatase. Average crystallite size and microstrain present in the powders were studied using the Williamson–Hall method and Debye–Scherrer equation. The crystal structure of all samples was refined by the Rietveld method, and a compression on the unit cell parameters was determined. These analyses revealed an increment in the unit cell strain when Au concentration was increased, and a decrease of the crystallinity in the powders when SG method was used. In the case of SC method samples, crystallinity and strain was found to remain constant.
Rafael Hernández; J. Rosendo Hernández-Reséndiz; Alejandro Martínez-Chávez; Rodrigo Velázquez-Castillo; Luis Escobar-Alarcón; Karen Esquivel. X-ray diffraction Rietveld structural analysis of Au–TiO2 powders synthesized by sol–gel route coupled to microwave and sonochemistry. Journal of Sol-Gel Science and Technology 2020, 95, 239 -252.
AMA StyleRafael Hernández, J. Rosendo Hernández-Reséndiz, Alejandro Martínez-Chávez, Rodrigo Velázquez-Castillo, Luis Escobar-Alarcón, Karen Esquivel. X-ray diffraction Rietveld structural analysis of Au–TiO2 powders synthesized by sol–gel route coupled to microwave and sonochemistry. Journal of Sol-Gel Science and Technology. 2020; 95 (1):239-252.
Chicago/Turabian StyleRafael Hernández; J. Rosendo Hernández-Reséndiz; Alejandro Martínez-Chávez; Rodrigo Velázquez-Castillo; Luis Escobar-Alarcón; Karen Esquivel. 2020. "X-ray diffraction Rietveld structural analysis of Au–TiO2 powders synthesized by sol–gel route coupled to microwave and sonochemistry." Journal of Sol-Gel Science and Technology 95, no. 1: 239-252.
Titanium dioxide is well known for its photocatalytic properties and low toxicity, meanwhile, silicone dioxide exhibits hydrophobic and hydrophilic properties and thermal stability. The union of these two materials offers a composite material with a wide range of applications that relate directly to the combined properties. The SiO2-TiO2 composite has been synthesized through physical methods and chemical methods and, with adequate conditions, morphology, crystallinity, boundaries between SiO2-TiO2, among other properties, can be controlled. Thus, the applications of this composite are wide for surface applications, being primarily used as powder or coating. However, the available research information on this kind of composite material is still novel, therefore research in this field is still needed in order to clarify all the physical and chemical properties of the material. This review aims to encompass the available methods of synthesis of SiO2-TiO2 composite with modifiers or dopants, the application and known chemical and physical properties in surfaces such as glass, mortar and textile, including aspects for the development of this material.
Alicia Rosales; Karen Esquivel. [email protected] Composite Synthesis and Its Hydrophobic Applications: A Review. Catalysts 2020, 10, 171 .
AMA StyleAlicia Rosales, Karen Esquivel. [email protected] Composite Synthesis and Its Hydrophobic Applications: A Review. Catalysts. 2020; 10 (2):171.
Chicago/Turabian StyleAlicia Rosales; Karen Esquivel. 2020. "[email protected] Composite Synthesis and Its Hydrophobic Applications: A Review." Catalysts 10, no. 2: 171.
Most commonly employed anodes for photoelectrochemical degradation of organic contaminants in water are too thick, resulting in a low degradation efficiency due to the excessive electron-hole recombination. Multilayer-type TiO2/Au/TiO2 nanocomposites have been prepared as photoanode thin films by pulsed laser deposition (PLD). The films were composed of six TiO2 and five Au alternate layers, with total thickness of about 212 nm, aimed to optimize the absorption of photons and minimize the recombination. The influence of gold on the optical, structural, and chemical properties of the semiconductor nanocomposites was investigated. The band gap determined from Tauc model was 3.22 eV, close to that obtained by spectroscopic ellipsometry and lower than that of the TiO2 film, revealing an enhancement of visible light absorption. The catalytic performance of PLD films was evaluated by using them as anodes in electro-oxidation (EO) and photoanodes in photoelectrocatalysis (PEC) to degrade 39–157 mg L−1 paracetamol in sulfate medium. The drug removal was very slow in EO, due to the low ability to form OH on the anode surface, which was significantly enhanced upon UVA irradiation in PEC. The presence of Cl− allowed a faster degradation by produced active chlorine. Finally, a hybrid process involving PEC + photoelectro-Fenton (PEF) with an air-diffusion cathode yielded total paracetamol decay in 4–5 min at an anodic potential of +4.0 V because of the efficient OH generation from Fenton’s and photo-Fenton reactions. Hydroquinone, p-benzoquinone and hydroxylated products were detected during EO and PEC. The generation of active chlorine was confirmed by identifying a chlorinated derivative, N-(4-chloro-2-hydroxyphenyl)acetamide, in PEC + PEF treatment.
Isidoro Olvera-Rodríguez; Rafael Hernández; Alejandro Medel; Carlos Guzmán; Luis Escobar-Alarcón; Enric Brillas; Ignasi Sirés; Karen Esquivel. TiO2/Au/TiO2 multilayer thin-film photoanodes synthesized by pulsed laser deposition for photoelectrochemical degradation of organic pollutants. Separation and Purification Technology 2019, 224, 189 -198.
AMA StyleIsidoro Olvera-Rodríguez, Rafael Hernández, Alejandro Medel, Carlos Guzmán, Luis Escobar-Alarcón, Enric Brillas, Ignasi Sirés, Karen Esquivel. TiO2/Au/TiO2 multilayer thin-film photoanodes synthesized by pulsed laser deposition for photoelectrochemical degradation of organic pollutants. Separation and Purification Technology. 2019; 224 ():189-198.
Chicago/Turabian StyleIsidoro Olvera-Rodríguez; Rafael Hernández; Alejandro Medel; Carlos Guzmán; Luis Escobar-Alarcón; Enric Brillas; Ignasi Sirés; Karen Esquivel. 2019. "TiO2/Au/TiO2 multilayer thin-film photoanodes synthesized by pulsed laser deposition for photoelectrochemical degradation of organic pollutants." Separation and Purification Technology 224, no. : 189-198.
An Au-TiO2 photoanode on carbon cloth has been synthesized by microwave-assisted sol-gel method to treat paracetamol solutions at pH 3.0 by photocatalysis (PC), electro-oxidation (EO), photoelectrocatalysis with UVA light (PEC), solar PEC (SPEC) and hybrid methods with photoelectro-Fenton under UVA (PEC + PEF) and sunlight (SPEC + SPEF) irradiation at constant anodic potential (Ean). The photoanode has been characterized by XRD, Raman spectroscopy, HRTEM and SEM-EDS. The counter electrode was a 316L stainless steel plate, which was replaced by an air-diffusion electrode for H2O2 generation in hybrid treatments. The most powerful process was SPEC + SPEF, yielding total paracetamol removal in <30 min and 24% mineralization after 180 min, at Ean = +0.82 V. The paracetamol decay followed a pseudo-first-order kinetics in PEC. A lower rate constant was obtained upon increase of pharmaceutical concentration, showing good linear fit using a Langmuir-Hinshelwood model.
Rafael Hernández; Isidoro Olvera-Rodríguez; Carlos Guzmán; Alejandro Medel; Luis Escobar-Alarcon; Enric Brillas; Ignasi Sirés; Karen Esquivel. Microwave-assisted sol-gel synthesis of an Au-TiO2 photoanode for the advanced oxidation of paracetamol as model pharmaceutical pollutant. Electrochemistry Communications 2018, 96, 42 -46.
AMA StyleRafael Hernández, Isidoro Olvera-Rodríguez, Carlos Guzmán, Alejandro Medel, Luis Escobar-Alarcon, Enric Brillas, Ignasi Sirés, Karen Esquivel. Microwave-assisted sol-gel synthesis of an Au-TiO2 photoanode for the advanced oxidation of paracetamol as model pharmaceutical pollutant. Electrochemistry Communications. 2018; 96 ():42-46.
Chicago/Turabian StyleRafael Hernández; Isidoro Olvera-Rodríguez; Carlos Guzmán; Alejandro Medel; Luis Escobar-Alarcon; Enric Brillas; Ignasi Sirés; Karen Esquivel. 2018. "Microwave-assisted sol-gel synthesis of an Au-TiO2 photoanode for the advanced oxidation of paracetamol as model pharmaceutical pollutant." Electrochemistry Communications 96, no. : 42-46.
Diego Manuel De Santiago Colín; L.A. Martínez-Chávez; Ángeles Cuán; Eduardo A. Elizalde-Peña; Josefina Alvarado Rivera; C. Guzmán; L. Escobar-Alarcón; K. Esquivel. Sonochemical coupled synthesis of Cr-TiO2 supported on Fe3O4 structures and chemical simulation of the degradation mechanism of Malachite Green dye. Journal of Photochemistry and Photobiology A: Chemistry 2018, 364, 250 -261.
AMA StyleDiego Manuel De Santiago Colín, L.A. Martínez-Chávez, Ángeles Cuán, Eduardo A. Elizalde-Peña, Josefina Alvarado Rivera, C. Guzmán, L. Escobar-Alarcón, K. Esquivel. Sonochemical coupled synthesis of Cr-TiO2 supported on Fe3O4 structures and chemical simulation of the degradation mechanism of Malachite Green dye. Journal of Photochemistry and Photobiology A: Chemistry. 2018; 364 ():250-261.
Chicago/Turabian StyleDiego Manuel De Santiago Colín; L.A. Martínez-Chávez; Ángeles Cuán; Eduardo A. Elizalde-Peña; Josefina Alvarado Rivera; C. Guzmán; L. Escobar-Alarcón; K. Esquivel. 2018. "Sonochemical coupled synthesis of Cr-TiO2 supported on Fe3O4 structures and chemical simulation of the degradation mechanism of Malachite Green dye." Journal of Photochemistry and Photobiology A: Chemistry 364, no. : 250-261.
Since nanotechnology was defined by Richard Feynman, multiple approaches has been developed in the field of communication, defense, food, biotechnology, electrical, chemical, sports and agricultural industry. The use of nanotechnology in horticulture are around of hybrid varieties, synthetic chemicals and biotechnology related with the fields of food processing, packaging, safety, nutrition, pesticides, and nutraceuticals. However, these applications still generating doubts about the possible environmental and human risks. The aim of this review is to discuss some advantages and impacts provided for the use of nanotechnology applied to the horticultural sector. Those advantages are focus on the main nanotechnology applications as Nanofertilizers or nano-encapsulated nutrients, germination and growth of plants as a negative effect of the nanomaterials, the effects of the natural processes (Photosynthesis) and Phytotoxic and some proposals of mechanism in the metabolic processes.
Ana Angelica Feregrino-Perez; Ernesto Magaña-López; C. Guzmán; K. Esquivel. A general overview of the benefits and possible negative effects of the nanotechnology in horticulture. Scientia Horticulturae 2018, 238, 126 -137.
AMA StyleAna Angelica Feregrino-Perez, Ernesto Magaña-López, C. Guzmán, K. Esquivel. A general overview of the benefits and possible negative effects of the nanotechnology in horticulture. Scientia Horticulturae. 2018; 238 ():126-137.
Chicago/Turabian StyleAna Angelica Feregrino-Perez; Ernesto Magaña-López; C. Guzmán; K. Esquivel. 2018. "A general overview of the benefits and possible negative effects of the nanotechnology in horticulture." Scientia Horticulturae 238, no. : 126-137.
Use of silicon dioxide (SiO2) and titanium dioxide (TiO2) have been widely investigated individually in coatings technology, but their combined properties promote compatibility for different innovative applications. For example, the photocatalytic properties of TiO2 coatings, when exposed to UV light, have interesting environmental applications, such as air purification, self-cleaning and antibacterial properties. However, as reported in different pilot projects, serious durability problems, associated with the adhesion between the substrate and TiO2, have been evidenced. Thus, the aim of this work is to synthesize SiO2 together with TiO2 to increase the durability of the photocatalytic coating without affecting its photocatalytic potential. Therefore, synthesis using sonochemistry, synthesis without sonochemistry, physical characterization, photocatalytic evaluation, and durability of the SiO2, [email protected] and TiO2 coatings are presented. Results indicate that using SiO2 improved the durability of the TiO2 coating without affecting its photocatalytic properties. Thus, this novel [email protected] coating shows potential for developing long-lasting, self-cleaning and air-purifying construction materials.
A. Rosales; A. Maury-Ramírez; R. Mejía-De Gutiérrez; C. Guzmán; K. Esquivel. SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation. Coatings 2018, 8, 120 .
AMA StyleA. Rosales, A. Maury-Ramírez, R. Mejía-De Gutiérrez, C. Guzmán, K. Esquivel. SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation. Coatings. 2018; 8 (4):120.
Chicago/Turabian StyleA. Rosales; A. Maury-Ramírez; R. Mejía-De Gutiérrez; C. Guzmán; K. Esquivel. 2018. "SiO2@TiO2 Coating: Synthesis, Physical Characterization and Photocatalytic Evaluation." Coatings 8, no. 4: 120.
Currently pathogen microorganisms, presents in wastewater, are more resistant to conventional disinfection process, due to its constant change induced for the antibiotic for human diseases. One of the new options for the pathogen microorganisms is the heterogeneous photocatalysis, which has been used for remove microorganism, but never in real wastewater effluent. This paper shown the synthesis of Ag–TiO2 nanoparticles, its physical characterization was carried out by TEM, SEM, S-BET, XPS and band gap measurement by UV-vis spectroscopy showing that Ag–TiO2 are spherical particles with sizes around 50 nm with 1 and 10 %w of Ag, and a significant decrease in the band gap. The disinfection system was illuminated using the solar radiation of a spring day at Querétaro, Mexico, in lapses from 11:00 am to 03:00 pm; the microbiological tests were performed according to the Official Mexican Norm (NOM-003-SEMARNAT-1996), the results shows that after 3 hours of solar photocatalysis disinfection process the material 1 %w Ag–TiO2 at 0.2 gL−1, removes the fecal and total coliform microorganisms from effluent, leaving Enterobacter, Escherichia, Citrobacter, Salmonella and Klebsiella microorganisms alive due to its capability of reactivation.
A Rodríguez-Méndez; C Guzmán; Eduardo A Elizalde-Peña; L Escobar-Alarcón; Marina Vega; Josefina Alvarado Rivera; K Esquivel. Effluent Disinfection of Real Wastewater by Ag–TiO2 Nanoparticles Photocatalysis. Journal of Nanoscience and Nanotechnology 2017, 17, 711 -719.
AMA StyleA Rodríguez-Méndez, C Guzmán, Eduardo A Elizalde-Peña, L Escobar-Alarcón, Marina Vega, Josefina Alvarado Rivera, K Esquivel. Effluent Disinfection of Real Wastewater by Ag–TiO2 Nanoparticles Photocatalysis. Journal of Nanoscience and Nanotechnology. 2017; 17 (1):711-719.
Chicago/Turabian StyleA Rodríguez-Méndez; C Guzmán; Eduardo A Elizalde-Peña; L Escobar-Alarcón; Marina Vega; Josefina Alvarado Rivera; K Esquivel. 2017. "Effluent Disinfection of Real Wastewater by Ag–TiO2 Nanoparticles Photocatalysis." Journal of Nanoscience and Nanotechnology 17, no. 1: 711-719.
In this paper several methods for titanium dioxide (TiO 2 ) synthesis are presented, the methods used were microwave assisted sol-gel, anodizing and plasma deposition, and these structures were also doped with Au. The obtained morphologies were characterized by Raman spectroscopy, scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and elemental analysis EDS, also its catalytic effectiveness was measured by the degradation of the methyl red dye in water by photocatalysis and photo-electrocatalysis test. As well as the mineralization ratio was recorded by the total organic carbon removal. The kinetic study was carried out in order to determine the behavior of the reaction in each color degradation.
I. Olvera-Rodriguez; R. Hernandez; Eduardo A. Elizalde-Pena; C. Guzman; L. Escobar-Alarcon; K. Esquivel. Evaluation of supported Au-TiO2catalyst over different substrates for methyl red dye removal. 2016 12th Congreso Internacional de Ingeniería (CONIIN) 2016, 1 -7.
AMA StyleI. Olvera-Rodriguez, R. Hernandez, Eduardo A. Elizalde-Pena, C. Guzman, L. Escobar-Alarcon, K. Esquivel. Evaluation of supported Au-TiO2catalyst over different substrates for methyl red dye removal. 2016 12th Congreso Internacional de Ingeniería (CONIIN). 2016; ():1-7.
Chicago/Turabian StyleI. Olvera-Rodriguez; R. Hernandez; Eduardo A. Elizalde-Pena; C. Guzman; L. Escobar-Alarcon; K. Esquivel. 2016. "Evaluation of supported Au-TiO2catalyst over different substrates for methyl red dye removal." 2016 12th Congreso Internacional de Ingeniería (CONIIN) , no. : 1-7.
TiO 2 -Pt photocatalysts have been synthesized by a sol-gel proccess microwave-assisted and characterized by means of several techniques (Scanning electron microscopy (SEM), powder X-ray diffraction (XRD), and Raman spectroscopic techniques) and used in the hydrogen generation under UV irradiation at room temperature. Crystals of anatase phase (size about 24 nm) was obtained, as confirmed by XRD. The morphology is regular and agglomerates are formed as the dopant (SEM) is added. TiO 2 -Pt material was used to make electrodes (working and counter), for his use in a photocatalytic electrolizar for the production of hydrogen, the first UV tests were successful, the material can produce hydrogen. The material will be tested in different concentrations (Pt) in the electrochemical cell to obtain a relationship between the cost and the production of hydrogen.
A. Martinez; R. Hernandez; E. A. Elizalde; K. Esquivel; A. Dominguez; C. Guzman. Photocatalytic electrolyzer prototype based in a material using TiO2-Pt. 2016 12th Congreso Internacional de Ingeniería (CONIIN) 2016, 1 -5.
AMA StyleA. Martinez, R. Hernandez, E. A. Elizalde, K. Esquivel, A. Dominguez, C. Guzman. Photocatalytic electrolyzer prototype based in a material using TiO2-Pt. 2016 12th Congreso Internacional de Ingeniería (CONIIN). 2016; ():1-5.
Chicago/Turabian StyleA. Martinez; R. Hernandez; E. A. Elizalde; K. Esquivel; A. Dominguez; C. Guzman. 2016. "Photocatalytic electrolyzer prototype based in a material using TiO2-Pt." 2016 12th Congreso Internacional de Ingeniería (CONIIN) , no. : 1-5.
Au-TiO 2 photocatalyst have been synthetized by a microwave assisted sol-gel method and characterized by means of X-ray diffraction techniques (XRD) and UV-vis diffuse reflectance spectroscopy. Photoelectrocatalytic degradation of methyl red dye have been carried out and a 95% degradation was achieved.
R. Hernandez; E. A. Elizalde; A. Domínguez; I. Olvera-Rodriguez; K. Esquivel; C. Guzman. Photoelectrocatalytic degradation of methyl red dye using Au doped TiO2photocatalyst. 2016 12th Congreso Internacional de Ingeniería (CONIIN) 2016, 1 -5.
AMA StyleR. Hernandez, E. A. Elizalde, A. Domínguez, I. Olvera-Rodriguez, K. Esquivel, C. Guzman. Photoelectrocatalytic degradation of methyl red dye using Au doped TiO2photocatalyst. 2016 12th Congreso Internacional de Ingeniería (CONIIN). 2016; ():1-5.
Chicago/Turabian StyleR. Hernandez; E. A. Elizalde; A. Domínguez; I. Olvera-Rodriguez; K. Esquivel; C. Guzman. 2016. "Photoelectrocatalytic degradation of methyl red dye using Au doped TiO2photocatalyst." 2016 12th Congreso Internacional de Ingeniería (CONIIN) , no. : 1-5.
Nowadays, experts are discussing the issue of water taking into account the Declaration of Dublin, in which the topic of water is treated like a sustainable issue. This declaration was presented in 1992. It is a fact that the scarcity and inadequate use of freshwater are leading us to a nonrational and sustainable development from an ecological point of view (N.R.W.C. Committee 1993; Chapman 2006; Walsh et al. 2006). Health and well-being, food security, and industrialization are other threatened areas, which are affecting ecosystems on which all human beings depend. That is the reason why to secure a future, it is necessary to have an effective management of water and soil resources.
L. Pérez-Sánchez; A. Rodríguez-Méndez; I. Montufar-Reyes; R. Trejo-Hernández; M. Mayorga-Garay; A. C. Montoya-Lizarraga; L. M. Macías-Sámano; B. Reséndiz-Luján; J. Alberto Rodríguez-Morales; Eduardo A. Elizalde-Peña; K. Esquivel-Escalante. Water Recycling in Biosystems for Food Production. Biosystems Engineering: Biofactories for Food Production in the Century XXI 2014, 77 -97.
AMA StyleL. Pérez-Sánchez, A. Rodríguez-Méndez, I. Montufar-Reyes, R. Trejo-Hernández, M. Mayorga-Garay, A. C. Montoya-Lizarraga, L. M. Macías-Sámano, B. Reséndiz-Luján, J. Alberto Rodríguez-Morales, Eduardo A. Elizalde-Peña, K. Esquivel-Escalante. Water Recycling in Biosystems for Food Production. Biosystems Engineering: Biofactories for Food Production in the Century XXI. 2014; ():77-97.
Chicago/Turabian StyleL. Pérez-Sánchez; A. Rodríguez-Méndez; I. Montufar-Reyes; R. Trejo-Hernández; M. Mayorga-Garay; A. C. Montoya-Lizarraga; L. M. Macías-Sámano; B. Reséndiz-Luján; J. Alberto Rodríguez-Morales; Eduardo A. Elizalde-Peña; K. Esquivel-Escalante. 2014. "Water Recycling in Biosystems for Food Production." Biosystems Engineering: Biofactories for Food Production in the Century XXI , no. : 77-97.
K. Esquivel; R. Nava; A. Zamudio-Méndez; M. Vega González; O.E. Jaime-Acuña; L. Escobar-Alarcón; J.M. Peralta-Hernández; B. Pawelec; J.L.G. Fierro. Microwave-assisted synthesis of (S)Fe/TiO2 systems: Effects of synthesis conditions and dopant concentration on photoactivity. Applied Catalysis B: Environmental 2013, 140-141, 213 -224.
AMA StyleK. Esquivel, R. Nava, A. Zamudio-Méndez, M. Vega González, O.E. Jaime-Acuña, L. Escobar-Alarcón, J.M. Peralta-Hernández, B. Pawelec, J.L.G. Fierro. Microwave-assisted synthesis of (S)Fe/TiO2 systems: Effects of synthesis conditions and dopant concentration on photoactivity. Applied Catalysis B: Environmental. 2013; 140-141 ():213-224.
Chicago/Turabian StyleK. Esquivel; R. Nava; A. Zamudio-Méndez; M. Vega González; O.E. Jaime-Acuña; L. Escobar-Alarcón; J.M. Peralta-Hernández; B. Pawelec; J.L.G. Fierro. 2013. "Microwave-assisted synthesis of (S)Fe/TiO2 systems: Effects of synthesis conditions and dopant concentration on photoactivity." Applied Catalysis B: Environmental 140-141, no. : 213-224.
Electrochemical incineration using boron-doped diamond electrodes was applied to samples obtained from a refinery and compared to the photo-electro-Fenton process in order to selectively eliminate the phenol and phenolic compounds from a complex matrix. Due to the complex chemical composition of the sample, a pretreatment to the sample in order to isolate the phenolic compounds was applied. The effects of the pretreatment and of pH on the degradation of the phenolic compounds were evaluated. The results indicate that the use of a boron-doped diamond electrode in an electrochemical incineration process mineralizes 99.5% of the phenolic sample content. Working in acidic medium (pH = 1), and applying 2 A at 298 K under constant stirring for 2 hours, also results in the incineration of the reaction intermediates reflected by 97% removal of TOC. In contrast, the photo-electro-Fenton process results in 99.9% oxidation of phenolic compounds with only a 25.69% removal of TOC.
Alejandro Medel; Erika Bustos; Karen Esquivel; Luis A. Godínez; Yunny Meas. Electrochemical Incineration of Phenolic Compounds from the Hydrocarbon Industry Using Boron-Doped Diamond Electrodes. International Journal of Photoenergy 2012, 2012, 1 -6.
AMA StyleAlejandro Medel, Erika Bustos, Karen Esquivel, Luis A. Godínez, Yunny Meas. Electrochemical Incineration of Phenolic Compounds from the Hydrocarbon Industry Using Boron-Doped Diamond Electrodes. International Journal of Photoenergy. 2012; 2012 ():1-6.
Chicago/Turabian StyleAlejandro Medel; Erika Bustos; Karen Esquivel; Luis A. Godínez; Yunny Meas. 2012. "Electrochemical Incineration of Phenolic Compounds from the Hydrocarbon Industry Using Boron-Doped Diamond Electrodes." International Journal of Photoenergy 2012, no. : 1-6.
Advanced oxidation processes (AOPs), on the basis of photoelectrochemical reactions, constitute a good alternative for treating wastewaters contaminated with refractory organic compounds such as dyes. For this purpose, different approaches have been explored to develop novel photoanodes that can be efficiently used in these systems. In this context, this study deals with a comparison of indium tin oxide (ITO) thin films deposited at room temperature by pulsed laser deposition on flat glass and on silica optical fiber (SiO2 core, 600 µm diameter) substrates. Characterization data reveal that nanostructured ITO thin films with resistivity values from 4.4×10-2 to 5.6×10-4 Ω·cm were obtained. To build the photoanode, the ITO thin films were coated with a TiO2 layer deposited by using the electrophoretic method. The prepared TiO2/ITO bilayers on optical fibers showed a better photocatalytic performance than those deposited on flat glass substrates according to TOC and color removal measurements from dye contaminated water samples. These results suggest that the deposited materials exhibit suitable properties for their application in photoelectrocatalytic devices that, employing optical fiber as support and light transmitter, can be efficiently used for the elimination of organic contaminants in industrial wastewaters.
K. Esquivel; F. J. Rodriguez; L. G. Arriaga; Enrique Camps; A. Durán-Moreno; L. Escobar-Alarcón; Luis A. Godínez. Photoelectrocatalytic Wastewater Treatment Using TiO2/ITO Bilayers Prepared on Optical Fibers by Pulsed Laser Deposition. Journal of Environmental Engineering 2011, 137, 355 -362.
AMA StyleK. Esquivel, F. J. Rodriguez, L. G. Arriaga, Enrique Camps, A. Durán-Moreno, L. Escobar-Alarcón, Luis A. Godínez. Photoelectrocatalytic Wastewater Treatment Using TiO2/ITO Bilayers Prepared on Optical Fibers by Pulsed Laser Deposition. Journal of Environmental Engineering. 2011; 137 (5):355-362.
Chicago/Turabian StyleK. Esquivel; F. J. Rodriguez; L. G. Arriaga; Enrique Camps; A. Durán-Moreno; L. Escobar-Alarcón; Luis A. Godínez. 2011. "Photoelectrocatalytic Wastewater Treatment Using TiO2/ITO Bilayers Prepared on Optical Fibers by Pulsed Laser Deposition." Journal of Environmental Engineering 137, no. 5: 355-362.