Abstract
Abstract Removal of dyes from aqueous solutions was investigated in a batchwise operation using binary or ternary silica-containing complex-oxide gels as adsorbents. The following three combinations of gels showed the best results: (1) silica-titania-magnesia gel for C.I. Acid Blue 40, (2) silica-titania gel for C.I. Basic Blue 3, and (3) silica-titania gel treated with alkali for C.I. Reactive Red 5. The adjustment of the initial pH of the dye solution was effective in all cases. Freundlich-type adsorption isotherms related the amount of dye adsorbed to its equilibrium concentration in solution. The gels which adsorbed the dye abundantly were effectively regenerated for reuse by heating them at 600°C, which caused decomposition of the dye.
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