آخرین محصولات
Fungal formation of selenium and tellurium nanoparticles
Selenium oxide and tellurium oxide were also found after growth of Trichoderma harzianum with 1 mM selenite and tellurite as well as the formation of elemental selenium and tellurium. The hyphal matrix provided nucleation sites for metalloid deposition with extracellular protein and extracellular polymeric substances localizing the resultant Se ...
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Biomineralization of tellurium and selenium-tellurium …
The extracellular produced selenium nanoparticles were found to be spherical in shape with 90–150 nm in size. Fourier transform infrared (FTIR) spectroscopy …
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Physico-chemical properties of selenium–tellurium alloys across …
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Continuous removal and recovery of tellurium in an upflow …
Introduction. Tellurium (Te) is a metalloid which belongs to the chalcogen group. Like sulfur and selenium, Te also exists in four oxidation states in the environment, including Te(VI) (tellurate, TeO 4 2−), Te(IV) (tellurite, TeO 3 2−), Te(0) (elemental Te(0)), and Te(-II) (telluride, Te 2−) [1], [2].Due to the excellent thermal, optical and electrical …
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Selenium and Tellurium Statistics and Information
Statistics and information on the worldwide supply of, demand for, and flow of the mineral commodities selenium and tellurium. Commercial quantities of selenium are recovered …
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SELENIUM AND TELLURIUM: STATE OF THE MARKETS, …
Selenium and tellurium are used as alloying additions in ferrous and nonferrous metallurgy. The current state of the international and Russian markets for selenium and tellurium is surveyed based on the literature data of the last several years. Selenium. Selenium comprises 6·10–5 mass % of the Earth's core and is classified as a trace ...
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Group 16: General Properties and Reactions
Oxygen Group (Group VIA) Trends. The oxygen family, also called the chalcogens, consists of the elements found in Group 16 of the periodic table and is considered among the main group elements. It consists of the elements oxygen, sulfur, selenium, tellurium and polonium. These can be found in nature in both free and …
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Selenium and Tellurium Chemistry
About this book. Our knowledge of the chemistry of selenium and tellurium has seen significant progress in the last few decades. This monograph comprises contributions from leading scientists on the latest research into the synthesis, structure and bonding of novel selenium and tellurium compounds. It provides insight into mechanistic studies ...
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Physico-chemical properties of selenium–tellurium alloys …
Physico-chemicalpropertiesofselenium–tellurium alloys across the scales Luke D. Geoffrion and Gregory Guisbiers´ * Selenium and tellurium are both energy critical elements as defined by the American Physical Society and the Materials Research Society. When mixed together, both elements form an alloy. The size- and shape-
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Fungal transformation of selenium and tellurium located in a
EEM fluorescence spectra of (A) soluble EPS and (B) Se- or (C) tellurium-bound EPS obtained from P. glomerata culture medium. Phoma glomerata was grown in AP1 liquid media amended with 1 mM Na 2 SeO 3 or Na 2 TeO 3 for 30 days at 25°C in the dark on an orbital shaking incubator at 125 rpm. Colour intensities are in arbitrary units, …
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Biogenic synthesis of selenium and tellurium nanoparticles
Selenium (SeNPs) and tellurium nanoparticles (TeNPs) were synthesized by green technology using the three new bacterial marine isolates (strains PL 2476, AF 2469 and G 2451). Isolates were classified as Pseudoalteromonas shioyasakiensis according to 16S rRNA sequence analysis, morphological characteristics, and biochemical reactions. …
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Mineral Commodity Summaries 2022
The estimated annual average price for selenium was $8.00 per pound in 2021, a 21% increase from that in 2020. Average weekly prices have risen steadily from the beginning …
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Selenium
Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. ... Berzelius found that selenium was present in samples of tellurium and gave that element its characteristic smell. He also became affected by it personally – it can be absorbed ...
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Physico-chemical properties of selenium–tellurium alloys across …
Selenium (Se) and tellurium (Te) are chalcogenide elements ( they belong to the oxygen column in the periodic table) that have been classified as energy critical elements by the …
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Selenium / Tellurium Two-Dimensional Structures: from Isovalent …
Here, combining molecular beam epitaxy, scanning tunneling microscopy/spectroscopy, X-ray photoelectron spectroscopy, and density functional …
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Mineral Commodity Summaries 2022
machining alloys; and bismuth and tellurium in lead-free brasses. Sulfur dioxide can be used as a replacement for selenium dioxide in the production of electrolytic manganese metal, but it is not as energy efficient. The selenium-tellurium photoreceptors used in some plain paper copiers and laser printers have been replaced by
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The resurrection of tellurium as an elemental two-dimensional
Akahama, Y., Kobayashi, M. & Kawamura, H. Pressure-induced superconductivity and phase transition in selenium and tellurium. Solid State Commun. …
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Metals | Free Full-Text | Selenium and Tellurium Separation: …
Conventionally, selenium fumes were recovered from the exhausted gas of roasting furnaces. However, a portion of selenium and tellurium remain in the residue, sent to an acidic or basic leaching process [].Moreover, selenium gas may not be entirely gathered in the filters and causes enormous ecological problems, such as air pollution by …
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The Chemistry of organic selenium and tellurium compounds.
Like the other volumes in this well established and respected series, this book covers the chemistry of organic selenium and tellurium compounds. The use of these important compounds in synthesis as well as the reaction mechanisms and bonding patterns involved are comprehensively and exhaustively investigated.
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Tellurium (UK PID)
Toxicology of selenium and tellurium and their compounds. Arch Environ Health 1961; 3: 189-200. De Meio RH. Tellurium. II. Effect of ascorbic acid on the tellurium breath. J Ind Hyg Toxicol 1947; 29: 393-5. De Meio RH, O'Leary DJ. Hemolysis by tellurium compounds: Telluride and tellurate, effect on reduced glutathione. ...
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A Novel Process For Recovery Of Te And Se From Copper …
tellurium and ended the test in one hour with final selenium and tellurium concentrations of 0.29 g/L and 0.60 g/L, respectively. As shown in Figure 6 the concentration of selenium in the solution was reduced from 4.0 to 0.7 g/L at 75°C in 2 hours, while the tellurium concentration was only slightly reduced from 3.18 to 3.00 g/L.
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(PDF) Green Synthesis of Selenium and Tellurium
nanoparticles, namely made of selenium (SeNPs) and tellurium (T eNPs), using various microorgan- isms, such as bacteria and fungi, and plants' extracts. It also discusses the methodologies followed
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Microbial-Based Bioremediation of Selenium and …
The chalcogens selenium (Se) and tellurium (Te) are rare earth elements, which are mainly present in the environment as toxic oxyanions, due to the anthropogenic activities. Thus, the increased …
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The Se-Te (Selenium-Tellurium) system | SpringerLink
The Selenium Tellurium System,"J. Inorganic Nuclear Chem.,31(3) 685–688 (1969). (Thermo; Experimental) Article Google Scholar P. Unger and P. Cherin,"Coordination and Thermal Motion in Crystalline Selenium and Tellurium,"Phys. of Selenium and Tellu- rium, Pergamon Press, Oxford, England, 223–229 (1969). (Crys …
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Cadmium Selenide Formation Influences the Production and
EPS make direct contact and interact with the metals and nanoparticles before the metals enter the cells and thus play a vital role in protecting the microbial cells [7,8,9,10,11]. An intimate association of EPS with biogenic nanoparticles (NPs), e.g., those of selenium, tellurium, silver, and palladium NPs, has also been reported [12,13,14,15].
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Characterisation of selenium and tellurium
Neither selenium or tellurium are extracted as primary ores; but are recovered as by-products during the processing of base metal ores such as Cu, Pb, Bi, Fe and other metals [1]. They have an extremely low crustal abundance (Se 0.05 – 0.09 mg kg −1, Te 0.02 mg kg −1 ) and have been classified amongst the 'critical' elements due to a ...
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Photoactivity and optical applications of organic materials …
from sulfur to selenium to tellurium.27 The decrease in polymer photoluminescent quantum yield (PLQY) when moving down Group 16 is indicative of more rapid ISC with heavier chalco-gens. The study compares three polymers (1) with identical solubilizing side chains: poly(3-hexylthiophene) (P3HT), poly(3-
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Mineral Commodity Summaries 2022
The selenium-tellurium photoreceptors used in some plain paper photocopiers and laser printers have been replaced by organic photoreceptors in newer devices. Amorphous silicon and copper-indium-gallium selenide were the two principal competitors of CdTe in thin-film photovoltaic solar cells. Bismuth selenide and organic polymers can be used
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Tellurium Data Sheet
The selenium-tellurium photoreceptors used in some plain paper photocopiers and laser printers have been replaced by organic photoreceptors in newer devices. Amorphous silicon and copper indium gallium selenide were the two principal competitors of CdTe in thin-film photovoltaic solar cells. Bismuth selenide and organic polymers can be used
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Reduction of selenite and tellurite by a highly metal-tolerant …
Selenium (Se) and tellurium (Te) contaminations in soils and water bodies have been widely reported in recent years. Se(IV) and Te(IV) were regarded as their most dangerous forms. Microbial treatments of Se(IV)- and Te(IV)-containing wastes are promising approaches because of their environmentally friendly and sustainable …
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