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Porous SiO2–TiO2–ZrO2 Obtained from Polymeric Systems Prepared by the Sol–Gel Process
Springer Science and Business Media LLC - Tập 8 - Trang 303-309 - 2001
An experimental strategy was developed to obtain Si–Ti–Zr transparent sols via the sol-gel process. The chelating agents isoeugenol (2-methoxy-4-propenylphenol, isoH), salicylaldehyde (2-hydroxybenzaldehyde, salH), and itaconic anhydride (2-methylenesuccinic anhydride, anhH) were employed separately to stabilize monomeric Ti and Zr precursors, in order to control their chemical reactivity, avoidin......
A comparative study of perfluorinated and non-fluorinated UiO-67 in gas adsorption
Springer Science and Business Media LLC - Tập 27 Số 6 - Trang 1773-1782 - 2020
Phase transition of mesoporous SiO2 impregnated with an organic templating agent by post-synthetic microwave heating
Springer Science and Business Media LLC - Tập 15 - Trang 93-99 - 2006
Mesoporous silica SBA-15 samples were subjected to microwave heating for 10–40 min at 393 and 443 K after dry-impregnation with TPAOH (tetrapropylammonium hydroxide) to prepare a mesoporous material with zeolytically ordered pore walls. Physicochemical properties of the materials prepared were characterized by XRD, N2 adsorption at 77 K, SEM, TEM, UV–vis and FT-IR spectroscopies. These investigati......
SEM–EDX and XRD characterization of zeolite NaA, synthesized from rice husk and aluminium scrap by different procedures for preparation of the initial hydrogel
Springer Science and Business Media LLC - Tập 20 - Trang 249-255 - 2012
A number of investigations have demonstrated that zeolite NaA could be synthesized using Si, extracted from rice husk ash; however, experiments on direct extraction of Si from rice husk (RH) are scarce. The main objective of the present study was to explore the possibility to synthesize high-quality zeolite NaA from RH and waste aluminium cans (as a source of Al), applying different procedures for......
Preparation of zeolite-cellulose composites for water disinfection
Springer Science and Business Media LLC - Tập 28 - Trang 1459-1468 - 2021
The drinking water shortage is globe concern currently, thus, developing an economical, green, antibacterial composites is urgent. Here, we report a simple and scalable strategy to synthesize zeolite-cellulose composites by the filter paper immersed in the precursor solution of synthetic zeolite. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray f......
Adsorption of CO2 and CO on H-zeolites with different framework topologies and chemical compositions and a correlation to probing protonic sites using NH3 adsorption
Springer Science and Business Media LLC - Tập 23 - Trang 291-299 - 2015
Adsorption of CO2 and CO at 25 °C has been conducted using commercially-available (Y, ZSM-5) and laboratory-synthesized (SSZ-13, SAPO-34) H-zeolites with different framework topologies and chemical compositions, and their textual and surface properties have been characterized by N2 sorption and NH3 adsorption techniques. All the zeolites were microporous, although ZSM-5 and SSZ-13 apparently showe......
Correlation of Photoluminescence and Optical Absorption Spectra of Porous Silicon
Springer Science and Business Media LLC - Tập 7 - Trang 311-314 - 2000
Using a quantum confinement based-PL model, PS was modelled as a mixture of Quantum Dots (QDs) and Quantum Wires (QWs) having different concentrations and sizes. It was shown that in the optical absorption edge the PL peak energy and the Optical Absorption (OA) exhibit the same trend, depending on preparation conditions. The spectral behaviours of PL and OA are analysed and correlated throughout t......
Novel porous organosilica containing amino and β-cyclodextrin groups
Springer Science and Business Media LLC - Tập 20 - Trang 663-671 - 2012
The elaboration of new hybrid mesoporous silica materials containing β-cyclodextrin groups and amine functions is reported. The synthesis is based on a direct co-condensation between β-CDAPS, a hybrid precursor obtained by reaction between tosyl-β-cyclodextrin and aminopropyltrimethoxysilane previously described, and tetraethyl orthosilicate via a sol–gel pathway templated by three different surfa......
A Vycor® Membrane with Reduced Size Surface Pores I. Preparation and Characterization
Springer Science and Business Media LLC - Tập 6 - Trang 25-31 - 1999
Vycor® membranes are surface-modified by a crosslinked commercial silicone which is subsequently subjected to oxygen plasma and converted to silica dioxide. Samples are examined by integral gas permeability of helium, nitrogen, methane and carbon dioxide, differential permeability of carbon dioxide and relative permeability of helium gas vs. water vapor. The modified surface is found to contain la......
Raman Scattering from Metal-Deposited Porous Silicon
Springer Science and Business Media LLC - Tập 7 - Trang 397-400 - 2000
Raman scattering from porous silicon layer into which silver is immersion-plated was studied. Ag-deposited samples show extra Raman bands. Heat treatment of the Ag-deposited samples results in a great decrease in such Raman bands. Also dipping in hydrofluoric acid solution causes a spectral change. Some comments on the assignment of the Raman peaks of the Ag-deposited porous silicon are given, and......
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