Síntesis y caracterización de nanopartículas magnéticas del tipo Fe3O4/TiO2, efecto del pH en la dispersión y estabilización en soluciones acuosas PDF Download
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Author: María Eulalia Vanegas
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Languages : es
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Se sintetizaron nanopartículas magnéticas del tipo Fe3O4/TiO2 (núcleo/coraza) mediante el método combinado que involucra para la síntesis inicial del Fe3O4 la co-precipitación química y para la formación de la capa de TiO2 la síntesis por la técnica sol-gel. Las nanopartículas magnéticas fueron caracterizadas antes y después del proceso de recubrimiento, mediante rayos-X y microscopía electrónica de barrido con emisión de campo y con microanálisis de rayos-X. El análisis de refinamiento estructural se realizó por el método Rietveld a través del programa FullProf, a partir de la difracción de rayos-X de polvo y confirmó la presencia de Fe3O4 como óxido de hierro y que el recubrimiento está constituido por TiO2 en su fase anastasa. El tamaño del cristal fue calculado mediante la ecuación de Scherrer y corresponde alrededor de 10nm, tanto para el Fe3O4 como para la capa de TiO2. Según los análisis de microscopía electrónica de barrido con emisión de campo, las nanopartículas magnéticas recubiertas tienen forma esférica y se encuentran altamente aglomeradas. Los resultados de microscopía electrónica de barrido con microanálisis de rayos-X confirman únicamente la presencia de tres elementos: Fe, Ti y O. Finalmente, la dispersión de las nanopartículas de Fe3O4/TiO2 en agua fue evaluada a diferentes valores de pH mediante espectroscopía ultravioleta en el rango del ultravioleta y el visible. Los mayores valores de absorbancia se obtuvieron a pH 8 y 4,5; mostrando una buena dispersión. Por otro lado, a pH 6,5 hay tendencia a aglomerarse con posterior precipitación.
Author: María Eulalia Vanegas
Publisher:
ISBN:
Category :
Languages : es
Pages :
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Book Description
Se sintetizaron nanopartículas magnéticas del tipo Fe3O4/TiO2 (núcleo/coraza) mediante el método combinado que involucra para la síntesis inicial del Fe3O4 la co-precipitación química y para la formación de la capa de TiO2 la síntesis por la técnica sol-gel. Las nanopartículas magnéticas fueron caracterizadas antes y después del proceso de recubrimiento, mediante rayos-X y microscopía electrónica de barrido con emisión de campo y con microanálisis de rayos-X. El análisis de refinamiento estructural se realizó por el método Rietveld a través del programa FullProf, a partir de la difracción de rayos-X de polvo y confirmó la presencia de Fe3O4 como óxido de hierro y que el recubrimiento está constituido por TiO2 en su fase anastasa. El tamaño del cristal fue calculado mediante la ecuación de Scherrer y corresponde alrededor de 10nm, tanto para el Fe3O4 como para la capa de TiO2. Según los análisis de microscopía electrónica de barrido con emisión de campo, las nanopartículas magnéticas recubiertas tienen forma esférica y se encuentran altamente aglomeradas. Los resultados de microscopía electrónica de barrido con microanálisis de rayos-X confirman únicamente la presencia de tres elementos: Fe, Ti y O. Finalmente, la dispersión de las nanopartículas de Fe3O4/TiO2 en agua fue evaluada a diferentes valores de pH mediante espectroscopía ultravioleta en el rango del ultravioleta y el visible. Los mayores valores de absorbancia se obtuvieron a pH 8 y 4,5; mostrando una buena dispersión. Por otro lado, a pH 6,5 hay tendencia a aglomerarse con posterior precipitación.
Author: Eric Genty
Publisher: MDPI
ISBN: 3039281607
Category : Technology & Engineering
Languages : en
Pages : 132
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Book Description
This Special Issue of Catalysts aims to cover the recent progress and novel trends in the field of catalytic oxidation reaction. Topics addressed in this special issue concern the influence of different parameters on catalytic activity at various scales (atomic, laboratory, pilot, or industrial scales), the development of new catalytic materials of environmental or industrial importance, as well as the development of new methods, both microscopic and spectroscopic, to analyze oxidation processes.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 249
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Author: María Eulalia Vanegas Peña
Publisher:
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Category :
Languages : es
Pages :
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Vol. 5; no. 2 (diciembre 2014)
Author: E. Valsami-Jones
Publisher: IWA Publishing
ISBN: 1843390019
Category : Science
Languages : en
Pages : 681
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Book Description
Phosphorus in Environmental Technology: Principles and Applications, provides a definitive and detailed presentation of state-of-the-art knowledge on the environmental behaviour of phosphorus and its applications to the treatment of waters and soils. Special attention is given to phosphorus removal for recovery technologies, a concept that has emerged over the past 5-6 years. The book features an all-encompassing approach: the fundamental science of phosphorus (chemistry, geochemistry, mineralogy, biology), key aspects of its environmental behaviour and mobility, industrial applications (treatment, removal, recovery) and the principles behind such applications, novel biotechnologies and, importantly, it also addresses socio-economic issues which often influence implementation and the ultimate success of any new technology. A detailed subject index helps the reader to find their way through the different scientific and technological aspects covered, making it an invaluable reference work for students, professionals and consultants dealing with phosphorus-related environmental technologies. State-of-the-art knowledge on the behaviour of phosphorus and its applications to environmental science and technology. Covers all aspects of phosphorus in the environment, engineered and biological systems; an interdisciplinary text.
Author: Piet Lens
Publisher: IWA Publishing
ISBN: 1843391007
Category : Science
Languages : en
Pages : 545
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Book Description
Soil and Sediment Remediation discusses in detail a whole set of remediative technologies currently available to minimise their impact. Technologies for the treatment of soils and sediments in-situ (landfarming, bioscreens, bioventing, nutrient injection, phytoremediation) and ex-situ (landfarming, bio-heap treatment, soil suspension reactor) will be discussed. The microbiological, process technological and socio-economical aspects of these technologies will be addressed. Special attention will be given to novel biotechnological processes that utilise sulfur cycle conversions, e.g. sulfur and heavy metal removal from soils. Also the potential of phytoremediation will be highlighted. In addition, treatment schemes for the clean-up of polluted megasites, e.g. harbours and Manufactured Gaswork Plants (MGP), will be elaborated. The aim of Soil and Sediment Remediation is to introduce the reader in: the biogeochemical characteristics of soil and sediments- new techniques to study soil/sediment processes (molecular probes, microelectrodes, NMR) clean up technologies for soils polluted with organic (PAH, NAPL, solvents) or inorganic (heavy metals) pollutants- preventative and remediative strategies and technologies available in environmental engineering novel process applications and bioreactor designs for bioremediation the impact of soil pollution on society and its economic importance.
Author: S. Norris
Publisher: Geological Society of London
ISBN: 186239654X
Category : Science
Languages : en
Pages : 618
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Book Description
This Special Publication contains 43 scientific studies presented at the 5th conference on ‘Clays in natural and engineered barriers for radioactive waste confinement’ held in Montpellier, France in 2012. The conference and this resulting volume cover all the aspects of clay characterization and behaviour considered at various temporal and spatial scales relevant to the confinement of radionuclides in clay, from basic phenomenological process descriptions to the global understanding of performance and safety at repository and geological scales. Special emphasis has been given to the modelling of processes occurring at the mineralogical level within the clay barriers. The papers in this Special Publication consider research into argillaceous media under the following topic areas: large-scale geological characterization; clay-based concept/large-scale experiments; hydrodynamical modelling; geochemistry; geomechanics; mass transfer/gas transfer; mass transfer mechanisms. The collection of different topics presented in this Special Publication demonstrates the diversity of geological repository research.
Author: United States. Office of Foreign Agricultural Relations
Publisher:
ISBN:
Category : Dairying
Languages : en
Pages : 70
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Author: Tatsuki Ohji
Publisher: John Wiley & Sons
ISBN: 1119100402
Category : Technology & Engineering
Languages : en
Pages : 538
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Book Description
In this book project, all the American Ceramic Society's Engineering Ceramics Division Mueller and Bridge Building Award Winners, the ICACC Plenary Speakers and the past Engineering Ceramics Division Chairs have been invited to write book chapters on a topic that is compatible with their technical interests and consistent with the scope of the book, which is to focus on the current status and future prospects of various technical topics related to engineering ceramics, advanced ceramics and composite materials. Topics include: Mechanical Behavior and Performance of Ceramics & Composites Non-Destructive Evaluation and Mechanical Testing of Engineering Ceramics Brittle and Composite Material Design Modern Fracture Mechanics of Ceramics Thermal/Environmental Barrier Coatings Advanced Ceramic Coatings for Functional Applications Advanced Ceramic Joining Technologies Ceramics for Machining, Friction, Wear, and Other Tribological Applications Ceramic Composites for High-Temperature Aerospace Structures and Propulsion Systems Thermal Protection Materials: From Retrospect to Foresight Carbon/Carbon Composites Ceramic-Matrix Composites for Lightweight Construction Ultra High-Temperature Ceramics (UHTC) Nanolaminated Ternary Carbides and Nitrides (MAX Phases) Ceramics for Heat Engine and Other Energy Related Applications Solid Oxide Fuel Cells (SOFC) Armor Ceramics Next Generation Bioceramics Ceramics for Innovative Energy and Storage Systems Designing Ceramics for Electrochemical Energy Storage Devices Nanostructured Materials and Nanotechnology Advanced Ceramic Processing and Manufacturing Technologies Engineering Porous Ceramics Thermal Management Materials and Technologies Geopolymers Advanced Ceramic Sensor Technology Advanced Ceramics and Composites for Nuclear and Fusion Applications Advanced Ceramic Technologies for Rechargeable Batteries
Author: M. H. Fulekar
Publisher: CRC Press
ISBN: 1498726259
Category : Science
Languages : en
Pages : 310
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Book Description
Environmental nanotechnology is considered to play a key role in shaping of current environmental engineering and science practices. This book titled "Environmental Nanotechnology" covers the advanced materials, devices, and system development for use in the environmental protection. The development of nano-based materials, understanding their chemistry and characterization using techniques like X- Ray diffraction, FT-IR, EDX, scanning electron microscope (SEM), transmission electron microscope (TEM), high resolution-TEM, etc is included. It also highlights the scope for their applications in environmental protection, environmental remediation and environmental biosensors for detection, monitoring and assessment. Key Features: Covers basic to advanced Nano-based materials, their synthesis, development, characterization and applications and all the updated information related to environmental nanotechnology. Discusses implications of nanomaterials on the environment and applications of nanotechnology to protect the environment. Illustrates specific topics such as ethics of nanotechnology development, Nano-biotechnology, and application in wastewater technology. Includes applications of nanomaterials for combating global climate change and carbon sequestration. Gives examples of field applications of environmental nanotechnology. This book covers advanced materials, devices, and system developments for use in environmental protection. The development of nano-based materials, understanding its chemistry and characterization by the use of X-Ray diffraction, FT-IR, EDX, scanning electron microscope (SEM), transmission electron microscope (TEM), and high resolution-TEM give the scope for their application in environmental protection, environmental remediation, and environmental biosensors for detection, monitoring, and assessment. The green chemistry based on nano-based materials prevents pollution and controls environmental contaminants.
