Spelling suggestions: "subject:"molybdenum compoundssynthesised"" "subject:"molybdenum complexes:synthesis""
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Synthesis and photocatalytic activity of the MoS2 and WS2 nanoparticles in degradation of organic compoundsJames, Derak J. January 2009 (has links)
Nanoparticles of MoS2 and WS2 were synthesized by decomposing the
appropriate metal hexacarbonyl in the presence of sulfur dissolved in decalin at 140°C.
A significant fraction of the nanoparticles was ≤ 15 nm in diameter as verified by
Transmission Electron Microscopy. The process was repeated in the presence of silica
and then titania to produce supported metal sulfides. The unsupported nanoparticles were
found to exhibit a size-dependent shift in their threshold UV-visible absorption due to
quantum confinement. Photocatalytic properties of each sulfide from synthesis in decalin
were explored by using each as a catalyst in the photodegradation of methylene blue by
visible light. These sulfides were also used to catalyze the photodegradation of acetone.
Unsupported MoS2 and WS2 nanoparticles catalyzed the photodegradation of
acetone under visible light of ≥ 400 nm wavelength. This is the first study reporting the
photocatalytic properties of the unsupported WS2 nanoparticles. Photodegradation of
methylene blue under ≥ 435 nm irradiation was detected using unsupported WS2 but not
unsupported MoS2, likely because activity was masked by the likely photobleaching of
the dye. When deposited on silica or titania, the nanosized MoS2 and WS2 could be
uniformly distributed in aqueous solutions to maximize the photocatalytic efficiency. Correcting the absorbance measurements for light scattering by solids proved to be beneficial for extracting kinetic information. Both silica deposited sulfides were found to significantly increase the rate of methylene blue photodegradation, and deposited WS2 increased this rate significantly more than deposited MoS2. Similarly, both titania deposited sulfides significantly increased the rate of methylene blue photodegradation, and the deposited WS2 increased this rate significantly more than the deposited MoS2 / Synthesis of the sulfide photocatalysts -- Characterization of synthesized nanoparticles -- Photocatalytic degradation tests : setup and protocols -- Photocatalytic degradation tests : results. / Department of Chemistry
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Synthesis and oxo-transfer properties of high-valent dioxo-tungsten and -molybdenum complexes with N, O, and S donor ligands. / CUHK electronic theses & dissertations collectionJanuary 1999 (has links)
by Yee-Lok Wong. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1999. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.
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Synthesis and adsorption properties of molybdenum(IV) sulfide and tungsten(IV) sulfide nanostructures with curved atomic layers / Title on signature form: Synthesis and adsorption properties of molybdenum (IV) sulfide and tungsten (IV) sulfide with curved atomic layersCombs, Ryan J. 25 January 2012 (has links)
Access to abstract permanently restricted to Ball State community only / Construction of experimental setup -- Synthesis of MoS₂ and WS₂ fullerene like structures -- Synthesis of MoS₂ and WS₂ nanotube like structures -- Infrared spectroscopy of acetonitrile adsorption on synthesized MoS₂ materials. / Access to thesis permanently restricted to Ball State community only / Department of Chemistry
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