DTA study of kinetics of transformation of silica gel to cristobalite

1976 ◽  
Vol 9 (1) ◽  
pp. 43-51 ◽  
Author(s):  
S. K. Das ◽  
S. K. Mookerjee ◽  
S. K. Niyogi ◽  
R. L. Thakur
Keyword(s):  
Silica Gel ◽  
Kinetics Of

Kinetics of Methane and Carbon Dioxide Hydrate Formation in Silica Gel Pores

2009 ◽  
Vol 23 (7) ◽  
pp. 3711-3715 ◽  
Author(s):  
Seong-Pil Kang ◽  
Yutaek Seo ◽  
Wonho Jang
Keyword(s):  
Carbon Dioxide ◽  
Silica Gel ◽  
Hydrate Formation ◽  
Carbon Dioxide Hydrate ◽  
Kinetics Of

Syneresis in Silica Gel

1988 ◽  
Vol 121 ◽  
Author(s):  
George W. Scherer
Keyword(s):  
Fluid Flow ◽  
Sample Size ◽  
Silica Gel ◽  
Chemical Reactions ◽  
Driving Force ◽  
Viscoelastic Behavior ◽  
Accurate Representation ◽  
Flow Through ◽  
Kinetics Of ◽  
Gel Network

ABSTRACTThe driving force for syneresis is generally attributed to the same chemical reactions that produce gelation, but it has also been proposed that shrinkage could be driven by interracial energy. The latter possibility is explored and discounted. The kinetics of syneresis depend on the driving force, the mobility of the gel network, and the rate of fluid flow through the contracting gel. A model that allows for viscoelastic behavior of the gel and fluid flow according to Darcy's law is shown to provide a quantitatively accurate representation of the shape of the shrinkage curves and the dependence of the shrinkage rate on sample size.

Physical properties and adsorption kinetics of silica-gel/water for adsorption chillers

2018 ◽  
Vol 137 ◽  
pp. 368-376 ◽  
Author(s):  
Ramy H. Mohammed ◽  
Osama Mesalhy ◽  
Mohamed L. Elsayed ◽  
Sichao Hou ◽  
Ming Su ◽  
...  
Keyword(s):  
Physical Properties ◽  
Silica Gel ◽  
Adsorption Kinetics ◽  
Kinetics Of

Kinetics of interaction of 3-aminopropyltriethoxysilane with silica gel using elemental analysis and 29Si NMR spectra

1997 ◽  
Vol 275 (7) ◽  
pp. 672-680 ◽  
Author(s):  
A. Yoshino ◽  
H. Okabayashi ◽  
I. Shimizu ◽  
C. J. O’Connor
Keyword(s):  
Silica Gel ◽  
Elemental Analysis ◽  
Nmr Spectra ◽  
29Si Nmr ◽  
29Si Nmr Spectra ◽  
Kinetics Of

Spectroscopy and Ion−Electron Recombination Kinetics of Radical Ions of Anthracenes and Substituted Anilines on Silica Gel

1999 ◽  
Vol 103 (43) ◽  
pp. 9255-9261 ◽  
Author(s):  
David R. Worrall ◽  
Siân L. Williams ◽  
Francis Wilkinson ◽  
Jill E. Crossley ◽  
Henri Bouas-Laurent ◽  
...  
Keyword(s):  
Silica Gel ◽  
Radical Ions ◽  
Electron Recombination ◽  
Substituted Anilines ◽  
Kinetics Of ◽  
Recombination Kinetics

Core-shell Fe-SiO2-polyamine magnetic nanoparticles for metal recovery using a continuous flow pipeline reactor

2018 ◽  
Vol 90 (8) ◽  
pp. 1225-1235
Author(s):  
Emile Deluca ◽  
Ryan Latterman ◽  
Edward Rosenberg
Keyword(s):  
Infrared Spectroscopy ◽  
Magnetic Nanoparticles ◽  
Silica Gel ◽  
Amorphous Silica ◽  
Continuous Flow ◽  
Metal Ion ◽  
Magnetic Nanomaterials ◽  
Core Shell ◽  
Successful Development ◽  
Kinetics Of

Abstract A series of core-shell magnetic nanomaterials have been synthesized with the intent of applying them for metal ion capture in a newly designed pipeline reactor. The synthetic chemistry is an extension of a previously developed family of materials based on amorphous silica gel, which has been used in the mining and remediation industries. The nanoparticles were characterized by infrared spectroscopy and TEM and SEM techniques. The size of the starting magnetite core was critical to the behavior of the particles under metal sequestering conditions. The capture kinetics of the resulting nanoagregates is 10 times faster than related micro composites. All of the tests performed point to the future successful development of a technology that circumvents the disadvantages associated with the use of column based microparticles.

scholarly journals Synthesis of Silica Gel Supported Amidoxime Ligand for Adsorption of Copper and Iron from Aqueous Media

2019 ◽  
Vol 31 (12) ◽  
pp. 3035-3040
Author(s):  
Sazmal Effendi Arshad ◽  
Zarina Amin ◽  
Perng Yang Puah ◽  
Mohd Sani Sarjadi ◽  
Baba Musta ◽  
...  
Keyword(s):  
Metal Ions ◽  
Silica Gel ◽  
Metal Ion ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Multilayer Adsorption ◽  
Metal Ion Adsorption ◽  
High Metal ◽  
Kinetics Of

Organic-inorganic hybrid polymers have been demonstrated to be an efficient technique for the adsorption of pollutants present in water. Silica gel adsorbent has been applied in this field due to promising characters, such as thermally stable, reusability and high metal ion adsorption capacities. Here, silica gel supported acrylonitrile functional group (silica-APTS-DPN) was reacted with hydroxylamine to yield silica gel supported amidoxime ligand (SBA). All the functionalized silica gel adsorbents were characterized by FTIR. In terms of metal ions adsorption, SBA revealed good absorption capacities towards both copper (Cu2+) (172 mg g-1) and iron (Fe3+) (168 mg g-1) ions at pH 6 and followed the order of Cu2+ > Fe3+. Increased pH condition was beneficial for both metal ions adsorption. The adsorption kinetics of both ions followed the pseudo-first-order model within 0-60 min of adsorption time. Langmuir and Freundlich isotherm models were both applied to study the adsorption behaviour, Freundlich isotherm model (R2 > 0.99) proved to be a better fit, which propose that multilayer adsorption occurred on the silica gel grafted with amidoxime ligand. Finally, this study proved that the silica gel supported amidoxime ligand was successfully applied as an absorbent for the removal of both copper and iron from aqueous media.

scholarly journals Adsorption Kinetics of Cu(II) Species on Silica Gel in the Presence of Humic Acid

2007 ◽  
Vol 18 (4) ◽  
pp. 168-173 ◽  
Author(s):  
Sri Juari Santosa ◽  
Narsito ◽  
Ratna
Keyword(s):  
Humic Acid ◽  
Silica Gel ◽  
Adsorption Kinetics ◽  
Kinetics Of
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