07-P-09 - Synthesis and characterizations of mesoporous zirconia-based oxide composites

JP, Zhao; Wu, Depei; Sun, Yongjun; Zhang, Zh.; Zhang, H.; Zhao, Deshuang

doi:10.1016/s0167-2991(01)81529-9

Cited by 2 publications

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“…A certain controversy exists about the effects associated with the presence of Zr atoms in the 29 Si NMR spectra of mesoporous silicas. While Jones et al 15 and Zhao et al 45 have reported on modifications of the spectra with the Zr content, Wang et al 12 and Chaudhari et al 13 have concluded that the presence of Zr in the second coordination sphere of Si does not lead to measurable variations in the shifts. As can be observed in Figure 7, there is a clear spectral evolution of the Si environments with the Zr content.…”

Section: Resultsmentioning

confidence: 99%

“…However, a detailed comparison with the spectrum of the sample exempt from Zr clearly shows that the new signals must be associated with the Zr incorporation. According to the relevant literature on both amorphous bulk zirconiumcontaining silicas and crystalline zirconium silicates, 45,47,48 the significant growth of the signal at -99 ppm can be attributed to the presence of Si(3Si, 1Zr) environments. Hence, this signal includes Si(3Si, 1Zr) and Si(3Si, OH) silicon environments, and the signal at ca.…”

Section: Resultsmentioning

confidence: 99%

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Atrane Precursors in the One-Pot Surfactant-Assisted Synthesis of High Zirconium Content Porous Silicas

et al. 2002

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A diversity of zirconium-containing porous silicas of the MCM-41 type (Zr−MCM-41, ∞ ≥ Si/Zr ≥ 0.33) has been synthesized from aqueous solution using a cationic surfactant (CTABr = cetyltrimethylammonium bromide) as the structural directing agent, and starting from molecular atrane complexes of Zr and Si as precursors. Atrane inertness toward hydrolysis allows harmonization of the reactivity of the Zr and Si species, which in turn avoids subsequent phase segregation and results in chemically very homogeneous materials. Materials characterization by XRD, TEM, and N2 adsorption−desorption isotherms shows that all the prepared Zr−MCM-41 solids have high surface area and unimodal narrow pore size distribution, whereas their pore packing motives range from ordered hexagonal to wormhole-like arrays depending on the Zr content. The study of the local environment of the Zr atoms in these solids has been approached by means of spectroscopic techniques (IR, UV−vis, and NMR).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Atrane Precursors in the One-Pot Surfactant-Assisted Synthesis of High Zirconium Content Porous Silicas

et al. 2002

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“…The pure water flux can be measured under a pressure difference of 0.2 MPa at an ambient temperature, and it can be calculated by the following equation [23].…”

Section: Measurement Of Water Absorption and Water Fluxmentioning

confidence: 99%

Synthesis, structural characterization, electrochemical, and electrical study of polystyrene-based manganous tungstate composite cation exchange membrane

Arsalan

2014

Desalination and Water Treatment

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The polystyrene-based manganous tungstate composite membrane was prepared by applying sol-gel method. The membrane was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, differential thermal analysis, scanning electron microscopy, and (LCR) study. Membrane was found to be crystalline, the arrangement of particle was uniform, and there were no sign of visible breakage or cracks. The theoretical value of potential was determined by Teorell-Meyer-Sievers, method and the electrochemical property was measured by a potentiometer. From observation, it is clear that the membrane potential increases with decreasing the concentration of electrolytes and the charge density follows the reverse order of potentials. By observing transport number the mobility ratio, distribution coefficient, and charge effectiveness can be calculated very easily.

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07-P-09 - Synthesis and characterizations of mesoporous zirconia-based oxide composites

Cited by 2 publications

References 0 publications

Atrane Precursors in the One-Pot Surfactant-Assisted Synthesis of High Zirconium Content Porous Silicas

Atrane Precursors in the One-Pot Surfactant-Assisted Synthesis of High Zirconium Content Porous Silicas

Synthesis, structural characterization, electrochemical, and electrical study of polystyrene-based manganous tungstate composite cation exchange membrane

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