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Geochemistry and mineralogy of beach sediments in the northern Gulf of Mexico,Tamaulipas state, Mexico: implication for provenance

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Journal of Palaeogeography 2024年第3期13卷 375-400页

作者： Mayank Shukla Sanjeet K.Verma Mayla A.Ramos-Vázquez John S.Armstrong-Altrin Karla R.Hernández-Martínez Sumit Mishra Vivek P.Malviya Héctor Hernández-Mendoza Posgrado de la División de Geociencias Aplicadas Instituto Potosino de Investigación Científica y Tecnológica (IPICYT) División de Geociencias Aplicadas Instituto Potosino de Investigación Científica y Tecnológica (IPICYT) Universidad Nacional Autónoma de México Instituto de Ciencias del Mar y Limnología Unidad de Procesos Oceanicos y Costeros Ciudad Universitaria Department of Marine Sciences Bharathidasan University Instituto de Geociencias Universidad Nacional Autónoma de México Department of Applied Geology Dr.Harisingh Gour Central University Instituto de Investigación de Zonas Desérticas Universidad Autónoma de San Luis Potosí Universidad del Centro de México

Geochemical and mineralogical studies were performed in the La Pesca(LP) and Tesoro Altamira(TA) beach sediments, located in the Tamaulipas state, northern Gulf of Mexico. The main aim of this study is to infer the weathering history and provenance and to discriminate the tectonic environment of the beach sediments. The sediments are composed of quartz with small amounts of accessory minerals such as plagioclase, calcite, orthoclase, microcline, and zircon. Both beach sediments are classified as fine-grained and very well sorted, however LP has coarse skewed and leptokurtic sediments, whereas TA has fine-skewed and very leptokurtic sediments. The chemical index of weathering(CIW') indicates intense weathering in the source area. The quartz grain microtextures in the LP and TA are classified into mechanical, chemical, and mechanical/chemical origin. Mechanical features such as fractures, pits, percussion marks, abrasion fatigue, and V-shaped marks favor high-energy littoral, fluvial, subaqueous-marine, and aeolian environments. The chemical features indicate solution pits and crystalline overgrowth, which suggests a silica saturated marine environment. The mechanical/chemical features display adhering particles and elongated depressions suggest formation in a sub-aqueous nearshore marine environment. Major and trace elements-based provenance discrimination diagrams indicate a felsic source derived from the Mesa Central(MC), Sierra Madre Oriental(SMOr) and Oaxaquia terranes. The major and trace element concentrations imply a passive margin setting for the northern Gulf of Mexico, which is consistent with the general geology.

关键词： Beach sediments Geochemistry Mineralogy Provenance Tamaulipas Tectonic setting

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Modified activated carbon with interconnected fibrils of iron-oxyhydroxides using Mn^(2+) as morphology regulator, for a superior arsenic removal from water

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Journal of Environmental Sciences 2019年第2期31卷 403-414页

作者： Cesar Nieto-Delgado Joel Gutiérrez-Martínez J.Rene Rangel-Méndez Environmental Sciences Division Potosino Institute of Scientific and Technological ResearchIPICyT

The arsenic removal efficiency of iron-modified activated carbons depends greatly on the number of available iron oxide surface sites, which are given by the surface area of the anchored particles. In this sense, aiming the generation of an adsorbent with superior arsenic adsorption capacity, we developed a protocol to anchor interconnected fibrils of iron oxyhydroxides, using Mn^(2+) as a morphology regulator. The protocol was based on a microwave-assisted hydrothermal method, using bituminous based activated carbon and both Fe^(2+) and Mn^(2+) ions in the hydrolysis solution. The elemental analysis of modified carbons revealed that Mn does not anchor to the carbon. However, when Mn is included in the hydrolysis solution, the iron content in the activated carbon increased up to 3.5 wt%,without considerable decreasing the adsorbent surface area. Under specific hydrothermal conditions, the Mn^(2+) promoted the formation of iron oxide nanoparticles shaped as interconnected fibrils. This material showed a superior arsenic adsorption capacity in comparison to similar iron modified activated carbons(5 mg As/g carbon, at 2 mg As/L),attributed to the increase in quantity and availability of active sites located on the novel interconnected fibrils of iron oxyhydroxides nanostructures.

关键词： Iron oxide nanostructures Hydrothermal synthesis Microwave Adsorption capacity Kinetics

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Response of bioaerosol cells to photocatalytic inactivation with ZnO and TiO_(2)impregnated onto Perlite and Poraver carriers

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Frontiers of Environmental Science & Engineering 2021年第3期15卷 137-149页

作者： Mariana Valdez-Castillo Sonia Arriaga Environmental Science Department Institute for Scientific and Technological Research of San Luis PotosiIPICYT.Camino Presa San Jose 2055Lomas 4a SeccionCP 78216San Luis PotosiMexico

Bioaerosols are airborne microorganisms that cause infectious sickness,respiratory and chronic health *** have become a latent threat,particularly in indoor *** is a promising process to inactivate completely bioaerosols from ***,in systems treating a continuous air flow,catalysts can be partially lost in the gaseous *** avoid such phenomenon,supporting materials can be used to fix *** the present work,four photocatalytic systems using Perlite or Poraver glass beads impregnated with ZnO or TiO_(2)were *** inactivation mechanism of bioaerosols and the cytotoxic effect of the catalysts to^bioaeros^ls were *** plug flow photocatalytic reactor treated a bioaerosol flow of 460×10^(6)cells/m^(3)_(air)with a residence time of 5.7 *** Cytometry(FC)was used to quantify and characterize bioaerosols in terms of dead,injured and live *** most efficient system was ZnO/Perlite with 72%inactivation of bioaerosols,maintaining such inactivation during 7.5 h due to the higher water retention capacity of Perlite(2.8 mL/gpcriite)in comparison with Poraver(1.5 mL/gperiite).However,a global balance showed that Ti0_(2)/Poraver system triggered the highest level of cytotoxicity to bioaerosols retained on the support after 96 h with 95%of dead *** and FC analyses showed that the mechanism of inactivation with ZnO was based on membrane damage,morphological cell changes and cell lysis;whereas only membrane damage and cell lysis were involved with Ti0_(2).Overall,results highlighted that photocatalytic technologies can completely inactivate bioaerosols in indoor environments.

关键词： Immobilized catalysts Continuous flow Photocatalysis Bioaerosols Cytotoxicity Inactivation mechanism

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Enhanced Ferromagnetism in ZnO Nanoribbons and Clusters Passivated with Sulfur

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Nano Research 2008年第5期1卷 420-426页

作者： Andres R.Botello-Mendez Florentino Lopez-Urias Mauricio Terrones Humberto Terrones National Laboratory for Nanoscience and Nanotechnology Research(LINAN) Advanced Materials DepartmentIPICYTCamino a la Presa San José205578216S.L.P.Mexico

Inspired by recent experimental results,the electronic and magnetic properties of sulfur-passivated ZnO clusters and zigzag nanoribbons have been studied using fi rst principles calculations in the framework of the local spin density *** the case of the ZnO nanoribbons,the sulfur atoms or thiol groups were attached in different ways to the zinc or oxygen atoms located at the edges,whereas in clusters,the sulfur atoms were set on the surface,mainly interacting with atoms with low-coordinate *** an exhaustive atomic relaxation,we found that a magnetic moment emerges in zigzag nanoribbons both with and without sulfur-passivation on the ***,the magnitude of the magnetic moment is very sensitive to sulfur *** particular,we found that when sulfur is attached to the zinc atoms in an alternating fashion along the ribbon edges,the magnetic moment is a maximum(1.4μB/unit cell).In the case of clusters,we found that the Zn_(15)O_(15) cluster exhibits a high spin moment of 5.5μB when capped with sulfur *** calculations indicate that sulfur-passivating of ZnO nanosystems could be responsible for recently observed ferromagnetic responses.

关键词： Zinc oxide sulfur magnetism nanoribbons clusters

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Experimental approaches to select tree species for forest restoration:effects of light,water availability and interspecific competition in degraded areas

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Journal of Forestry Research 2022年第4期33卷 1197-1207页

作者： Johanna Croce Ernesto I.Badano Carolina B.Trigo Fernanda Martinez-Galvez Andrés Tálamo Laboratorio de Ecología Aplicada a la Conservación Instituto de Bio y Geociencias del Noroeste ArgentinoConsejo de Investigaciones Científi cas y Técnicas-Universidad Nacional de SaltaAvenida Bolivia 51504400 SaltaArgentina ipicyt/División de Ciencias Ambientales Instituto Potosino de Investigación Científi ca y TecnológicaCamino a la Presa San José2055Colonia Lomas 4^(a)Sección78216 San Luis PotosíMéxico

Knowing what native trees can recr uit on degraded areas allows selecting the best species to restore these ***,as this information is not often available,experimentation is required before large-scale *** study used ex situ experiments to make these decisions on *** with r-strategist plants,excessive solar radiation and water shortage commonly impair tree recruitment in open *** experiments focused on the interactions among these factors and were conducted with three pioneer species from seasonally dry forests of northwest Argentina,Anadenanthera colubrina,Ceiba chodatii and Jacaranda *** of each species were sown at two light levels(sunlight/shade),two rainfall levels(full/reduced)and two levels of interspecific competition(with/without competitor)in a tree *** emergence and survival were monitored over a year and the results indicate that species differentially respond to varying levels of light and *** of *** tolerated water shortages under elevated solar radiation,which are desirable features for forest *** of *** tolerated shade and drought,suggesting that they require shading for establishing in open ***,*** seedlings neither tolerated full sunlight nor water shortages,suggesting that this species requires shading and regular watering if used in *** of the effects of light and water,the survival of all species was reduced by interspecific *** results highlight the importance of experimentation for selecting the best species for forest restoration and can enhance the cost/benefit ratios of these actions.

关键词： Common-garden experiments Drought Ecological restoration Interspecific competition Seedling survival Shade

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Carbamazepine degradation by visible-light-driven photocatalyst Ag_(3)PO_(4)/GO:Mechanism and pathway

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Environmental Science and Ecotechnology 2022年第1期9卷 17-26页

作者： Guanhan Chen Wenyi Dong Hongjie Wang Zilong Zhao Feng Wang Feifei Wang Cesar Nieto-Delgado School of Civil and Environmental Engineering Harbin Institute of Technology ShenzhenShenzhen518055PR China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Shenzhen518055PR China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090PR China Division de Ciencias Ambientales Instituto Potosino de Investigacion Científica y TecnologicaIPICyT.Camino a la Presa San Jose 2055.San Luis PotosíSLP 78216Mexico

Carbamazepine(CBZ),as one of the most frequently detected pharmaceuticals,is of great concern due to its potential impact on the ecosystem and human *** study provides an effective approach to remove CBZ by using photocatalyst silver phosphate combined with graphene oxide(Ag_(3)PO_(4)/GO)under visible *** morphology,composition,and optical properties of Ag_(3)PO_(4)/GO were characterized employing SEM,XRD,and *** oxide could improve the visible-light utilization and promote electron's charge to enhance the photocatalytic performance of Ag_(3)PO_(4)/*** the optimal reaction condition of 5.86 mW/cm_(2)light intensity,15-25℃ temperature,5-7 pH,and 0.5 mg/L catalytic dosages,5 mg/L CBZ could be completely degraded in 30 min,and the apparent rate constant could reach 0.12 min^(-1).Additionally,the radical trapping experiments indicated·OH and O_(2)^(-)· were the main reactive oxygen species employed to eliminate *** decay pathways of CBZ had been proposed accordingly,and the main product was the low-molecular products.

关键词： Carbamazepine Ag_(3)PO_(4)/GO Visible light Photocatalysis

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Subsidence associated with land use changes in urban aquifers with intensive extraction

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Natural Science 2013年第2期5卷 291-295页

作者： Briseida Lopez-Alvarez José Alfredo Ramos-Leal Germán Santacruz-De Leon Janete Morán-Ramirez Simón Eduardo Carranco-Lozada Cristina Noyola-Medrano Applied Geosciences Division Potosin Institute of Scientific and Technological Research C.A. (IPICYT) San Luís Potosí México Faculty of Engineering University of San Luis Potosí (UASLP) San Luis Potosí México Pg Postgraduate Applied Geoscience Potosin Institute of Scientific and Technological Research C.A. (IPICYT) San Luís Potosí México Water and Society Program College of San Luis C. A. (COLSAN) San Luis Potosí México

Land use change is a major factor in alterations in natural processes and cycles. Remote sensing has become an excellent tool to evaluate technological changes in land cover and land use changes over large areas, such as those occurring in the Valley of San Luis Potosi (VSLP). Here, such changes have impacted a system which is 95% dependent on the aquifer. The methodology for the present study is based on the use of satellite images for the years 1976, 1986, 1995 and 2000. To asses land use change, a supervised classification process was used with a decision tree technique and ENVI 4.3 software. The evolution of groundwater levels for the years 1977, 1986, 1995, 1998 and 2007 was also analyzed, as well as problems of subsidence and fissuring in the urban area of the valley in 2006. With the support of remote sensing, it was possible to analyze the dynamic changes in land use over large areas and highlight their impact on the environment.

关键词： Land Use Change Mining Intensive Extraction Subsidence Aquifer urban Arid Zone

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Controllable Biosynthesis of Small Silver Nanoparticles Using Fungal Extract

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Journal of Biomaterials and Nanobiotechnology 2016年第2期7卷 118-125页

作者： Katrin Quester Miguel Avalos-Borja Ernestina Castro-Longoria Departamento de Microbiología Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE) Ensenada Mexico Centro de Nanociencias y Nanotecnología Universidad Nacional Autónoma de México (UNAM) Ensenada Mexico División de Materiales Avanzados Instituto Potosino de Investigación Científica y Tecnológica (IPICyT) San Luis Potosí Mexico

The search for reliable and eco-friendly methods for the production of nanoscale materials is an important aspect of nanotechnology. Silver nanoparticles (AgNPs) are of special interest because of their antimicrobial properties, especially those of small size. In this work, AgNPs were produced under different conditions of temperature and pH using the extract from the fungus Neurospora crassa as reducing agent. Mainly quasi-spherical particles were obtained at all incubation conditions. However, optimum conditions to produce small sizes in the range of 2 - 9 nm were at 4°C and pH 3, also particles of 2 - 22 nm were obtained at 25°C with unmodified pH (6.5) and pH 10. Nevertheless, only particles synthesized at 25°C and pH 10 maintained the same size range after storage of 10 months. In summary, optimal incubation conditions for the synthesis of silver nanoparticles of small size range are reported. This improves the storage time of particles without losing its original size and without going into aggregation or agglomeration.

关键词： Biosynthesis Nanoparticles Neurospora crassa

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Synthesis and Characterization of GaN Rods Prepared by Ammono-Chemical Vapor Deposition

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Advances in Chemical Engineering and Science 2012年第2期2卷 292-299页

作者： Gregorio Guadalupe Carbajal Arízaga Karina Viridiana Chávez Hernández Nicolás Cayetano Castro Manuel Herrera Zaldivar Rafael García Gutiérrez Oscar Edel Contreras López Centro de Investigación en Física Universidad de Sonora Hermosillo México Centro de Nanociencias y Nanotecnología Universidad Nacional Autónoma de México Ensenada México Departamento de Química Universidad de Guadalajara Guadalajara México Instituto Potosino de Investigación Científica y Tecnológica (ipicyt) División de Materiales Avanzados (LINAN) San Luis Potosí México

GaN rods were deposited by chemical vapor deposition (CVD) onto sapphire (0 0 0 1) and amorphous quartz. The reactive Ga species in vapor the phase was formed with NH4Cl and gallium. The unidirectional growth was catalyzed with gold nanoparticles formed onto the substrate prior to the CVD reaction in order to induce a vapor-liquid-solid (VLS) mechanism. However, this method of synthesis seems to be influenced by other growth mechanisms which formed additional depositions of GaN with different morphology than the rods catalyzed by gold nanoparticles. The moieties of GaN that grew in the absence of gold formed branches in the rods or increased the lateral growth of rods resulting in larger diameters than the size of the gold particle that guided the growth.

关键词： Crystal Morphology Nanostructures Chemical Vapor Deposition Processes Semiconducting III-V Material

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Isolation and Characterization of Mercury Resistant Trichoderma Strains from Soil with High Levels of Mercury and Its Effects on Arabidopsis thaliana Mercury Uptake

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Advances in Microbiology 2018年第7期8卷 600-613页

作者： JoséLuis Hernández-Flores JoséGerardo Bernal Melo Andrés Cruz Hernández Miguel A.Ramos López Carlos Saldana Gutiérrez Sergio Romero Gomez Victor Pérez Moreno Rosa P.Calvillo Medina JoséHumberto Valenzuela Soto Sergio Pacheco Hernández George H.Jones Sergio Casas Flores Juan Campos-Guillen Laboratorio de Bioseguridad y Análisis de Riesgo Departamento de Ingeniería Genética de PlantasCentro de Investigación y de Estudios Avanzados del IPNIrapuatoGto.México Facultad de Química Universidad Autónoma de QuerétaroCerro de las Campanas s/nQuerétaroQro.México Escuela de Agronomía Universidad De La Salle Bajíocampus Campestre.LeónGto.México Facultad de Ciencias Naturales Universidad Autónoma de QuerétaroAv.De las Ciencias S/NQuerétaroQro.México Centro de Investigación en Química Aplicada Blvd.Enrique Reyna Hermosillo No.140SaltilloCoahuilaMéxico Department of Biology Emory UniversityAtlantaGeorgiaUSA ipicyt División de Biología Molecular.Camino a la presa San JoséNo.2055Colonia Lomas 4a sección.C.P.San Luis PotosíMexico

Traditional mining activities are usually correlated with high levels of soil pollution, which is a major environmental concern. Extensive mining activities have taken place in the San Joaquin region in the State of Querétaro, México resulting in high levels of mercury soil pollution (up to 1532 ± 300 mg/kg). We isolated mercury-resistant fungal strains from the San Joaquin region soils and identified them through morphologic characteristics and ITS rDNA region sequence analysis. We determined that fungi isolated belong to the genus Trichoderma. All the isolates selected showed the ability to catalyze the volatilization of Hg. For air sampling, an active sampling device was constructed and using acid KMnO4 as an absorbent, the concentration of mercury in solution was determined through the cold vapor atomic absorption method. The results show mercury volatilization from the fungal species assay, with a maximum of 213.04 ± 32.6 μg/m3 while mycelium accumulation ranged from less than 17.5 ± 2.9 to 20.0 ± 3.4 μg/g. The fungal isolates were also evaluated for their ability to reduce mercury uptake in Arabidopsis thaliana. These observations suggest the utility of Trichoderma for the mobilization of mercury in those contaminated soils.

关键词： Volatilization Mercury Trichoderma Soil Bioremediation

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