Download or read book Microbial Synthesis of Chalcogenide Nanoparticles written by Joyabrata Mal and published by CRC Press. This book was released on 2018-04-27 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent years have seen a growing interest in the application of chalcogenide nanoparticles (NPs), e.g. Se, Te, CdSe and CdTe NPs, in various industrial sectors including energy, petroleum refining and in the field of biology and medicine. Moreover, due to the high toxicity of chalcogen oxyanions, their release into the environment is of great concern. Thus, emphasis was given in this study on the development of a novel microbial synthesis process of chalcogenide NPs by combining biological treatment of Se/Te containing wastewaters with biorecovery in the form of Se NPs, Te NPs and CdSe NPs. Enrichment of Se-oxyanion reducing microorganisms was carried out to simultaneously remove selenite (Se(IV)) and cadmium (Cd(II)) from wastewaters by combining bioremediation of toxic Se-rich wastewater with the biorecovery of Se as CdSe NPs. The results showed compositional changes in the extracellular polymeric substances (EPS) matrix of the anaerobic granular sludge upon exposure to Cd(II) and Se(IV) and identified the roles of EPS fractions in the biogenesis of CdSe NPs. Besides, it was found that the EPS on the surface of the biogenic Se NPs play a major role in lowering the bioavailability and toxicity of biogenic Se(0) compared to chemogenic Se(0) NPs. An upflow anaerobic sludge blanket (UASB) reactor was used for the first time to continuously remove tellurite from wastewater and recover biogenic Te(0).

Download or read book Microbial Synthesis of Chalcogenide Nanoparticles written by Joyabrata Mal and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent years have seen a growing interest in the application of chalcogenide nanoparticles (NPs) (e.g. Se, Te) in various industrial sectors including energy, steels, glass and petroleum refining. The fluorescent metal chalcogenide (e.g. CdSe, CdTe) NPs are used in solar cells, optoelectronic sensors and also in the field of biology and medicine for imaging or sensing including biolabelling. Moreover, due to the high toxicity of chalcogen oxyanions (i.e., selenite, selenate, tellurite and tellurate), their release in the environment is of great concern. Thus, emphasize was given in this thesis on the development of a novel microbial synthesis process of chalcogenide NPs by combining biological treatment of Se/Te-containing wastewaters with biorecovery of Se/Te in the form of Se/Te chalcogenides NPs.A special focus was given to study the effect of heavy metal (e.g. Cd, Zn and Pd) co-contaminants on selenite bioreduction by anaerobic granular sludge. Anaerobic granular sludge capable of reducing selenite to selenide in the presence of Cd was enriched for the microbial synthesis of CdSe NPs. It was evident that when Cd is present along with selenite, it either forms a Se-Cd complex by adsorption onto biogenic Se(0) nanoparticles after Se-oxyanion bioreduction or it reacts with aqueous selenide (HSe-) to form CdSe. The absorption and fluorescence spectra of the aqueous phase confirm the presence of CdSe NPs in the aqueous phase. Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) analysis support this finding. The formation of an alloyed layer of CdSxSe1-x at the interface between the CdSe core and CdS shell in the sludge was also observed. Detailed studies on the extracellular polymeric substances (EPS) reveal that the protein and polysaccharide-like content increased in the EPS extracted from enriched sludge while humic-like substances decreased. Size exclusion chromatography (SEC) of EPS further reveals a distinct fingerprint for proteins and humic-like substances, with increase in high molecular weight protein-like and the appearance of new peaks for humic-like substances in the EPS after the enrichment.An upflow anaerobic granular sludge bed (UASB) reactor was used for the first time for continuous removal of tellurite from synthetic wastewater and the recovery of Te as biogenic Te(0). Energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Raman spectroscopic analysis of biomass confirmed the deposition of Te(0) in the biomass. It was evident that the majority of the Te(0) was trapped predominantly in the EPS surrounding the biomass, which can be easily separated by centrifugation.

Download or read book Chalcogenide Based Nanomaterials as Photocatalysts written by Mohammad Mansoob Khan and published by Elsevier. This book was released on 2021-04-07 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chalcogenide-Based Nanomaterials as Photocatalysts deals with the different types of chalcogenide-based photocatalytic reactions, covering the fundamental concepts of photocatalytic reactions involving chalcogenides for a range of energy and environmental applications. Sections focus on nanostructure control, synthesis methods, activity enhancement strategies, environmental applications, and perspectives of chalcogenide-based nanomaterials. The book offers guidelines for designing new chalcogenide-based nanoscale photocatalysts at low cost and high efficiency for efficient utilization of solar energy in the areas of energy production and environment remediation. - Provides information on the development of novel chalcogenide-based nanomaterials - Outlines the fundamentals of chalcogenides-based photocatalysis - Includes techniques for heterogeneous catalysis based on chalcogenide-based nanomaterials

Download or read book Handbook of Emerging Materials for Sustainable Energy written by Naveen V. Kulkarni and published by Elsevier. This book was released on 2024-02-28 with total page 1034 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Emerging Materials for Sustainable Energy provides a comprehensive accounting on the fundamentals, current developments, challenges and future prospects of emerging materials for the development of sustainable energy. Each chapter addresses a distinct and important area within the energy field and includes comprehensive data to support the materials being presented. Sections cover Batteries, Capacitors and Supercapacitors, Fuel cells, Thermoelectrics, Novel illumination sources and techniques, Photovoltaics & Solar cells, Alternative energy sources, hydrogen as an energy source, including hydrogen production and fuel generation, the use of Biofuels and Carbon dioxide. The book concludes with three chapters related to advanced materials under development for energy conservation and environmental protection, including theories, methodologies and simulations established for advanced materials. - Covers a broad scope of advanced materials that have been developed for energy and environmental sustainability - Provides detailed and updated information about the structural and functional features of various emerging materials and their multifaceted applications - Includes supplementary data alongside each chapter

Download or read book Extremophiles Applications in Nanotechnology written by Sonia Tiquia-Arashiro and published by Springer. This book was released on 2016-09-29 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the extremophiles explored for biosynthesis of nanoparticles. Nanotechnology is a widely emerging field involving interdisciplinary subjects such as biology, physics, chemistry and medicine. A wide variety of microorganisms, such as bacteria, fungi and algae are employed as biological agents for the synthesis of nanoparticles. Novel routes by which extremophiles can be employed to generate nanoparticles have yet to be discovered. The book is divided into 5 major chapters: (1) Major types of nanoparticles in nanotechnology (2) Diversity of microbes in the synthesis of nanoparticles (3) Extremophiles in nanoparticle biosynthesis (4) Applications of nanoparticles produced by extremophiles (5) Challenges and Future perspectives

Download or read book Solution Synthesis of Mixed Metal Chalcogenide Nanoparticles and Spray Deposition of Precursor Films written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polyol mediated Synthesis of Chalcogenide Nanoparticles for Thin film Solar Cells written by Hailong Dong and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surfactant Coated Metal Chalcogenide Nanoparticles written by Alexander Rabkin and published by . This book was released on 2010 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microbial Synthesis of Metallic Molybdenum Nanoparticles written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simple Chemical Routes for Changing Composition Or Morphology in Metal Chalcogenide Nanomaterials written by Stacey Elaine Wark and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal chalcogenide nanomaterials are interesting due to their size dependent properties and potential use in numerous types of devices or applications. The synthetic methods of binary phase metal chalcogenide nanoparticles are well established, but finding simple ways to make even more complex nanostructures is important. To this end, two techniques were studied: the cation exchange of metal chalcogenide nanocrystals, CdE 2!MxEy (E = S, Se, Te; M = Pd, Pt) and the solution phase synthesis of ternary chalcogenide nanoparticles. The effects of cation solvation and the volume change ([Delta] V) of reaction on the equilibrium and the morphology change in the cation-exchange reactions of CdE 2!MxEy were investigated. A two-phase solvent environment was particularly efficient in increasing the thermodynamic driving force. The effect of [Delta] V of reaction on the morphology of the product nanocrystals was also investigated. Depending on the stress developed in the lattice during the reaction, product nanocrystals underwent varying degrees of morphological changes, such as void formation and fragmentation, in addition to the preservation of the original morphology of the reactant nanocrystals. The knowledge of the effect of ion solvation and [Delta] V of reaction on the equilibrium and product morphology provides a new strategy and useful guide to the application of cation-exchange reactions for the synthesis of a broader range of inorganic nanocrystals. Using a solution phase method, the morphology of CuInSe2 nanoparticles could be tuned from small 10 nm spheres to micron length nanowires by varying the relative amount of strong and weak surfactants passivating the surface. Oleylamine and trioctylphosphine oxide were chosen as the strong and weak surfactants, respectively. Small isotropic structures were formed when the oleylamine was the only surfactant with the size of the nanospheres increasing as the amount of oleylamine decreased. For the CuInSe2 nanowires, weakly-binding dioctylphosphine oxide (DOPO), an impurity in the TOPO, was found to be the key surfactant that enables the anisotropic one-dimensional growth. Detailed analysis of the structure of the nanowires indicated that they grow perpendicular to (112) planes, with twinning around the growth axis by ~60° rotation. The nanowires exhibit a saw-tooth surface morphology resembling a stack of truncated tetrahedral.

Download or read book Synthesis and Characterization of Metal Chalcogenide MQ2 nanoparticles written by Nicole Christin Zink and published by . This book was released on 2006 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Characterization of Copper Chalcogenide Nanoparticles and Their Use in Solution Processed Photovoltaics written by Pierre Mubiayi Kalenga and published by . This book was released on 2015 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamentals of Nanoparticles written by Abdel Salam Hamdy Makhlouf and published by William Andrew. This book was released on 2018-08-09 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Nanoparticles: Classifications, Synthesis Methods, Properties and Characterization explores the nanoparticles and architecture of nanostructured materials being used today in a comprehensive, detailed manner. This book focuses primarily on the characterization, properties and synthesis of nanoscale materials, and is divided into three major parts. This is a valuable reference for materials scientists, and chemical and mechanical engineers working in R&D and academia, who want to learn more about how nanoparticles and nanomaterials are characterized and engineered. Part one covers nanoparticles formation, self-assembly in the architecture nanostructures, types and classifications of nanoparticles, and signature physical and chemical properties, toxicity and regulations. Part two presents different ways to form nanometer particles, including bottom-up and top-down approaches, the classical and non-classical theories of nanoparticles formation and self-assembly, surface functionalization and other surface treatments to allow practical use. Part three covers characterization of nanoparticles and nanostructured materials, including the determination of size and shape, in addition to atomic and electronic structures and other important properties. - Includes new physical and chemical techniques for the synthesis of nanoparticles and architecture nanostructures - Features an in-depth treatment of nanoparticles and nanostructures, including their characterization and chemical and physical properties - Explores the unusual properties of materials that are developed by modifying their shape and composition and by manipulating the arrangement of atoms and molecules - Explains important techniques for the synthesis, fabrication and the characterization of complex nano-architectures

Download or read book Bio Nanoparticles written by Om V. Singh and published by John Wiley & Sons. This book was released on 2015-06-22 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoparticles are the building blocks for nanotechnology; they are better built, long lasting, cleaner, safer, and smarter products for use across industries, including communications, medicine, transportation, agriculture and other industries. Controlled size, shape, composition, crystallinity, and structure-dependent properties govern the unique properties of nanotechnology. Bio-Nanoparticles: Biosynthesis and Sustainable Biotechnological Implications explores both the basics of and advancements in nanoparticle biosynthesis. The text introduces the reader to a variety of microorganisms able to synthesize nanoparticles, provides an overview of the methodologies applied to biosynthesize nanoparticles for medical and commercial use, and gives an overview of regulations governing their use. Authored by leaders in the field, Bio-Nanoparticles: Biosynthesis and Sustainable Biotechnological Implications bridges the gap between biology and technology, and is an invaluable resource for students and researchers alike.

Download or read book Thiourea urea Metal Cd Ni Chalcogenide O S Complexes for the Synthesis and Characterization of Metal Chalcogenide Nanoparticles written by and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The understanding of the fundamental properties and potential use of semiconductor materials in nanotechnology has stimulated the interest of many researchers. Coordination compounds containing ligands with chalcogenide atoms as donors have received considerable attention. Among these chalcogenide ligands, thiourea and urea have been extensively used previously to form single source precursors for the synthesis of group II–VI semiconductor nanoparticles. The synthesis and study of semiconductor nanocrystals has become a subject area of considerable research interest because they have potentially useful applications such as biomedical imaging, sensing, light-emitting diodes (LEDs), photovoltaics and displays.

Download or read book Synthesis of Lead and Cadmium Chalcogenide Nanomaterials and the Study of Shape Stability and Instabilities of PbS and PbSe Nanocrystals written by Deborah Berhanu and published by . This book was released on 2009 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Review of Materials Research written by Print&online and published by Annual Reviews. This book was released on 2004-08 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: