Removal of lead from aqueous solutions by xerogel film supported on activated carbon and silica

Carbon xerogel [X], a kind of novel carbon material with low-density and continuous nano-porous structure that can be controlled and tailored on nanometer scale, has been prepared through the sol-gel polycondensation of resorcinol [R] with formaldehyde [F] followed by drying at ambient pressure and carbonization in inert atmosphere. Batch adsorption experiments were performed to find out the effective lead removal at different metal ion concentrations. Removal of lead from aqueous solutions by adsorption onto xerogel film supported on activated carbon and silica has been performed. The removal of Pb ions from aqueous solutions was studied by batch method. The effects of initial metal concentrations, initial pH, contact time and the quantity of adsorbents were investigated. It was found that carbon xerogel supported on activated carbon exhibited the best adsorption potential for removal of lead ions from solutions

Changes in thermal textural and acidic properties of alumina induced by surfactants

Alumina gels were precipitated in presence of nonionic, anionic and cationic surfactants. The gel was dried and calcined in the temperature range 400-800C. The textural and acidic properties of these thermal products were compared with the corresponding calcination products of pure alumina gel. Surfactants affected the thermal behavior of the gel, ionic surfactants being more effective. Textural changes resulted also in the thermal products of the gels precipitated in presence of surfactants at their critical micelle concentration [CMC]. Addition of cationic surfactants increased surface acidity whereas anionic surfactants resulted in an opposite effect