I'm trying to dissolve silica gel (use for Chromatography) using solvents or mixture of solvents. My main intention dissolve silica gel and incorporate the biosorbent. and evaporate the solvent, so I'll get a final product of biosorbent entrapped in silica gel.
Silica is mainly soluble under three conditions: highly alkaline such NaOH or KOH; in presence of free fluoride ions; or by complexation with molybdate ions. In any case, conditions are pretty extreme for all of them.
Colloidal silica might be obtained by removing Na from sodium silicate solutions by ionic exchange, but I never dug up deep in that so I cannot give you more indications about.
Dissolve and disperse.. there's huge difference between these two.
Many solvents can be used to 'disperse' silica gel.. most common are Methanol, ethers, chloroform or many chlorinated solvents.. Choice of solvent to "disperse" depends on type of your 'biosorbent'... is it polar or non-polar?
No; I need to dissolve silica gel and re solidify it. One method is to heat silica gel with 7% KOH but I want another method.
Silica is mainly soluble under three conditions: highly alkaline such NaOH or KOH; in presence of free fluoride ions; or by complexation with molybdate ions. In any case, conditions are pretty extreme for all of them.
Colloidal silica might be obtained by removing Na from sodium silicate solutions by ionic exchange, but I never dug up deep in that so I cannot give you more indications about.
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