Spectroscopic studies of post-doped silica gel monoliths

1994 ◽  
Vol 2 (1-3) ◽  
pp. 855-859 ◽  
Author(s):  
Carole C. Harrison ◽  
James K. Mcgiveron ◽  
Xiaochun Li
Keyword(s):  
Silica Gel ◽  
Spectroscopic Studies ◽  
Silica Gel Monoliths

scholarly journals Temperature and pH Effect on the Sorption of Divalent Metal Ions by Silica Gel

2003 ◽  
Vol 21 (4) ◽  
pp. 297-307 ◽  
Author(s):  
S. Mustafa ◽  
B. Dilara ◽  
A. Naeem ◽  
N. Rehana ◽  
K. Nargis
Keyword(s):  
Silica Gel ◽  
Ph Effect ◽  
Exchange Process ◽  
Binding Constants ◽  
Metal Cations ◽  
Spectroscopic Studies ◽  
Ion Concentration ◽  
Divalent Metal Ions ◽  
Sorption Data ◽  
Ir Spectroscopic

The sorption of Zn2+, Ni2+ and Cd2+ ions by silica gel was studied as a function of ion concentration, pH and temperature. An increase in all three parameters led to an increase in the extent of sorption for all the metal cations studied. The selectivity of the solid was observed to be in the order Zn2+ > Ni2+ > Cd2+. Sorption of the metal cations was accompanied by the release of H+ ions into the bulk phase. On average two moles of H+ ions were released per mole of metal cation sorbed. The sorption data fitted the linear forms of both the Kurbatov and Langmuir adsorption equations. The values of the binding constants were used to estimate the apparent thermodynamic parameters, ΔH and ΔS, for the adsorption process. FT-IR spectroscopic studies also showed that the uptake of metal cations by the silica gel occurred via a cation-exchange process.

Optical properties of Co2+-doped silica gel monoliths

1994 ◽  
Vol 176 (2-3) ◽  
pp. 172-178 ◽  
Author(s):  
A Boos ◽  
G Pourroy ◽  
J.L Rehspringer ◽  
J.L Guille
Keyword(s):  
Optical Properties ◽  
Silica Gel ◽  
Silica Gel Monoliths

Nickel nano-particles in silica gel monoliths: control of the size and magnetic properties

2001 ◽  
Vol 15 (1-2) ◽  
pp. 179-182 ◽  
Author(s):  
O. Cı́ntora-González ◽  
C. Estournès ◽  
M. Richard-Plouet ◽  
J.L. Guille
Keyword(s):  
Magnetic Properties ◽  
Silica Gel ◽  
Nano Particles ◽  
Silica Gel Monoliths
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