Synthesis of Hydrophobic Silicalite Adsorbent from Domestic Resources: the Effect of Alkalinity on the Crystal Size and Morphology

A new polymorph crystalline silica composition having uniform pore dimensionswere synthesized by calcining a crystalline hydrated alkyl-ammonium silicate. the pore dimensionsapproximately were 6 angstrom for silicalite-1 and 11 angstromfor silicalite-2 units. the silicalite-1was prepared hydrothermally at a ph of about 10 from a reaction mixture consist of water,amorphous silica and a quaternary ammonium compound. domestic water glass was ion-exchangedto produce silicasol. in this work we also investigated the influence of alkalinity percent in thestarting gel mixture on the crystal shape and size.