Detection of a covalent-ionic carbinolamine intermediate in aqueous media by SDTLC on silica gel plates

2007 ◽  
Vol 20 (3) ◽  
pp. 227-230 ◽  
Author(s):  
Ana Reverdito ◽  
Mariano García ◽  
Alejandra Salerno ◽  
Oscar Locani ◽  
Isabel Perillo
Keyword(s):  
Silica Gel ◽  
Aqueous Media

Modification of silica gel by attachment of 2-mercaptobenzimidazole for use in removing Hg(II) from aqueous media: A thermodynamic approach

2007 ◽  
Vol 311 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Edésio F.C. Alcântara ◽  
Elaine A. Faria ◽  
Deyse V. Rodrigues ◽  
Sheila M. Evangelista ◽  
Edimar DeOliveira ◽  
...  
Keyword(s):  
Silica Gel ◽  
Aqueous Media ◽  
Thermodynamic Approach

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 New thiamine functionalized silica microparticules as a sorbent for the removal of lead, mercury and cadmium ions in aqueous media

2017 ◽  
Vol 82 (2) ◽  
pp. 215-226 ◽  
Author(s):  
Sabahattin Deniz ◽  
Neşe Taşci ◽  
Ece Yetimoğlu ◽  
Memet Kahraman
Keyword(s):  
Metal Ions ◽  
Silica Gel ◽  
Adsorption Process ◽  
Binding Capacity ◽  
Aqueous Media ◽  
Vitamin B1 ◽  
Isotherm Models ◽  
Potential Candidate ◽  
Functionalized Silica ◽  
Feed Concentration

The existence of heavy metal ions in aqueous media is one of the biggest environmental pollution problems and thus the removal of heavy metals is a very important procedure. In this work, a new adsorbent was synthesized by modifying 3-aminopropyl-functionalized silica gel with thiamine (vitamin B1) and characterized. The influence of the uptake conditions, such as pH, contact time, initial feed concentration and foreign metal ions, on the binding capacity of thiamine-functionalized silica gel sorbent (M3APS) were investigated. Maximum obtained adsorption capacities for Pb(II), Hg(II) and Cd(II) were 39.4?0.2, 30.9?0.5 and 9.54?0.4 mg g-1 M3APS, respectively, at pH 5.0. The observed selectivity of M3APS for these metal ions was the following: Pb(II) > Hg(II) > Cd(II). Adsorption isotherm models were also applied to the adsorption process. As a result, the Langmuir isotherm model gave the best fit for the adsorption of metal ions on M3APS. The Gibbs energy change (?G) for the adsorption of Pb(II), Hg(II) and Cd(II) were calculated to predict the nature of adsorption process. Having such satisfactory adsorption results, M3APS is a potential candidate adsorbent for Pb(II) and Hg(II) removal from aqueous media.

Chemical Synthesis of α-Formylphenylacetic Acid, the Postulated Precursor of Tropic Acid

1981 ◽  
Vol 36 (7-8) ◽  
pp. 611-614 ◽  
Author(s):  
Georg G. Gross ◽  
Karl J. Koelen ◽  
Angelika Müller ◽  
Günter Schmidtberg
Keyword(s):  
Chemical Synthesis ◽  
Silica Gel ◽  
Aqueous Media ◽  
Organic Solution ◽  
Acid Biosynthesis ◽  
Tropic Acid ◽  
Ph Values ◽  
Biosynthetic Studies

Abstract a-Formylphenylacetic Acid, Phenylmalonic Semialdehyde, Tropic Acid Biosynthesis a-Formylphenylacetic acid, the postulated immediate precursor of tropic acid, has been synthesized by deacetalization of a-diethoxymethylphenylacetic acid in the presence of silica gel. The compound was reasonably stable in organic solution. In aqueous media, however, a pronounced lability of this semialdehyde was observed at various pH-values (t/2 = 4.5 min at pH 7.4). It is thus very unlikely that this compound can be employed successfully in biosynthetic studies.

Synthesis of ion-imprinted mesoporous silica gel sorbent for selective adsorption of copper ions in aqueous media

2010 ◽  
Vol 171 (1-2) ◽  
pp. 203-209 ◽  
Author(s):  
Genhua Wu ◽  
Guocheng Song ◽  
Dayu Wu ◽  
Yuyong Shen ◽  
Zhuqing Wang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Gel ◽  
Copper Ions ◽  
Selective Adsorption ◽  
Aqueous Media ◽  
Ion Imprinted ◽  
Mesoporous Silica Gel
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