Synthesis and characterization of tin containing molybdophosphate and tungstophosphate glasses

Chenu, Sébastien; Rocherullé, Jean; Lebullenger, Ronan; Merdrignac, O.; Cheviré, François; Tessier, Franck; Oudadesse, Hassane

doi:10.1016/j.jnoncrysol.2009.11.001

Cited by 18 publications

(5 citation statements)

References 17 publications

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“…Another weight loss observed beyond 770 1C is due to the vaporization of MoO 3 , as established by the DTA curve; the results are in agreement with previous studies. [30][31][32] The peak located at 480 1C observed in the DTA curve suggests the transformation of the h-MoO 3 phase into the thermodynamically stable a-MoO 3 , as reported by many workers. 30,31 The surface area of the catalyst and efficient separation of charge carriers usually play a key role in enhancing the photocatalytic activity.…”

Section: Resultssupporting

confidence: 75%

Harvesting visible light with MoO₃ nanorods modified by Fe(iii) nanoclusters for effective photocatalytic degradation of organic pollutants

Alam

Kumar

Bahnemann

et al. 2018

Phys. Chem. Chem. Phys.

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The photocatalytic performance of MoO is limited due to its weak visible light absorption ability and quick recombination of charge carriers. In the present work, we report the facile synthesis of Fe(iii)-grafted MoO nanorods using a hydrothermal method followed by an impregnation technique with the aim of enhancing the light harvesting ability and photocatalytic efficiency of MoO. The prepared samples were characterized through the standard analytical techniques of XRD, SEM-EDS, TEM, XPS, UV-Vis-DRS, FT-IR, TG-DTA and PL spectrophotometry. XPS and TEM analyses reveal that Fe(iii) ions are successfully grafted onto the surface of the MoO nanorod with intimate interfacial contact. The photocatalytic performances of the prepared samples were investigated by studying the degradation of methylene blue (MB), rhodamine B (RhB) and 4-nitrophenol (4-NP) under visible light irradiation. The surface-modified MoO with Fe(iii) ions showed excellent photocatalytic activity towards the degradation of the above-mentioned pollutants, where Fe(iii) ions act as effective cocatalytic sites to produce hydroxyl radicals through multi-electron reduction of oxygen molecules. The improved photocatalytic activity could be ascribed to the effective separation of charge carriers and efficient production of hydroxyl radicals via the rapid capture of electrons by Fe(iii) through a well-known photoinduced interfacial charge transfer mechanism. Based on scavenger analysis study, a mechanism for the enhanced photocatalytic activity has been discussed and proposed. The concept of surface grafting onto large bandgap semiconductors with ubiquitous elements opens up a new avenue for the development of visible-light-responsive photocatalysts with excellent photocatalytic activity.

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Section: Resultssupporting

confidence: 75%

Harvesting visible light with MoO₃ nanorods modified by Fe(iii) nanoclusters for effective photocatalytic degradation of organic pollutants

Alam

Kumar

Bahnemann

et al. 2018

Phys. Chem. Chem. Phys.

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“…The constituents of glasses interact with MW energy and thereby generate heat above certain critical temperature (500‐600°C) . The use of MW heating for glass melting has been reported for ion‐conducting glass, tin containing molybdo‐phosphate and tungsto‐phosphate glasses, niobium phosphate glass, iron phosphate glass, and other inorganic glasses . In these studies, glass compositions were formulated with the addition of considerable amount of MW absorber (in some cases 50% or more).…”

Section: Introductionmentioning

confidence: 99%

Optimization of melting parameters and minimizing OH content in SiO₂‐B₂O₃‐Na₂O‐BaO glass system in microwave heating

Mandal

Sen

2018

Int J of Appl Glass Sci

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This study investigates the optimization of melting process for the glass comprising SiO2‐B2O3‐Na2O‐BaO under microwave (MW) heating. Batches were melted at different temperatures in the range of 900‐1250°C to optimize melting condition. X‐ray diffraction suggests amorphous nature of samples melted above 1150°C. Optimization of melting time was carried out by varying soaking time (8‐60 minutes) at 1250°C. UV‐Vis‐NIR spectra reveal ~90% transmission over 300‐2000 nm wavelength range for glass melted at 1250°C. Optical microscopic images suggest that the bubble‐free glass can be produced at 1250°C for 1 hour melting in MW heating. MW heating also helps in reducing OH content in glass. However, OH concentration is found to increase with melting time. OH content could be minimized to 68.56 ppm in glass employing oxygen atmosphere melting, which prevents OH diffusion from atmosphere into the melt. Residual stresses are estimated to be less in MW heating than conventional heating. Maximum MW power was observed to be 1 kW with a total electrical power consumption of around 5 kWh. Also, total time needed to prepare the glass is around 2 hours. Thus, MW heating could be an alternate efficient tool in producing low OH content glass.

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“…However, the use of microwave heating for processing of glass has been reported such as melting of tin containing molybdo-phosphate and tungsto-phosphate glass [4], preparation of inorganic glasses [5], Niobium phosphate glasses [6], fast ion conducting glasses [7] and iron phosphate glasses [8]. Preparation of phosphate glass with this route has been explored using precursor like NH4H2PO4•2H2O, H3PO4, NaH2PO4•2H2O, etc.…”

Section: Introductionmentioning

confidence: 99%

Microwave Absorption of Barium Borosilicate, Zinc Borate, Fe-Doped Alumino-Phosphate Glasses and Its Raw Materials

Mandal¹,

Sen²

2015

Technologies

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This study presents microwave absorption of raw materials used in barium borosilicate, Fe-doped alumina phosphate and zinc borate glass. Microwave absorption was investigated for the raw materials SiO2, Na2CO3, BaCO3, BPO4, Al(PO3)3, Mg(PO3)2, Al(OH)3, TiO2. The study shows that SiO2 could be heated directly above 1000 °C within 30 min at 1.5 kW microwave output (MW) power and 0.8 kW MW power is necessary to initiate heating (from 260 °C). Microwave heating of material with low dielectric loss has been investigated by increasing MW power. Microwave absorption of above glass systems has also been investigated. Dielectric properties such as loss tangent of glass as a function of temperature are presented. Glass melting under direct microwave heating was demonstrated for the studied glass systems. Temperature-Microwave power-Time (T-P-t) profiles for the three glasses indicate maximum MW output power ~1 kW, 0.65 kW and ~1 kW for barium borosilicate, zinc borate glass and alumino-phosphate glass for 60 g glass melting.

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Synthesis and characterization of tin containing molybdophosphate and tungstophosphate glasses

Cited by 18 publications

References 17 publications

Harvesting visible light with MoO₃ nanorods modified by Fe(iii) nanoclusters for effective photocatalytic degradation of organic pollutants

Harvesting visible light with MoO₃ nanorods modified by Fe(iii) nanoclusters for effective photocatalytic degradation of organic pollutants

Optimization of melting parameters and minimizing OH content in SiO₂‐B₂O₃‐Na₂O‐BaO glass system in microwave heating

Microwave Absorption of Barium Borosilicate, Zinc Borate, Fe-Doped Alumino-Phosphate Glasses and Its Raw Materials

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Synthesis and characterization of tin containing molybdophosphate and tungstophosphate glasses

Cited by 18 publications

References 17 publications

Harvesting visible light with MoO3 nanorods modified by Fe(iii) nanoclusters for effective photocatalytic degradation of organic pollutants

Harvesting visible light with MoO3 nanorods modified by Fe(iii) nanoclusters for effective photocatalytic degradation of organic pollutants

Optimization of melting parameters and minimizing OH content in SiO2‐B2O3‐Na2O‐BaO glass system in microwave heating

Microwave Absorption of Barium Borosilicate, Zinc Borate, Fe-Doped Alumino-Phosphate Glasses and Its Raw Materials

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Product

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Harvesting visible light with MoO₃ nanorods modified by Fe(iii) nanoclusters for effective photocatalytic degradation of organic pollutants

Harvesting visible light with MoO₃ nanorods modified by Fe(iii) nanoclusters for effective photocatalytic degradation of organic pollutants

Optimization of melting parameters and minimizing OH content in SiO₂‐B₂O₃‐Na₂O‐BaO glass system in microwave heating