J.-X. Dong, H. Xu, G.-Y. Zhang, L. Liu, J.-P. Li
March 1, 2013
In different type water, the hydrolysis of δ-modification layered sodium disilicate (δ-Na 2 Si 2 O 5 ) was investigated by employing XRD, FT-IR, SEM chemical analysis and residual solid yield. δ-Na 2 Si 2 O 5 was transported to another layered sodium silicate-kanemite (NaHSi 2 O 5 ·3H 2 O with cation exchange ability) in distilled water near the concentration in a magnitude, which is used by washing clothing. At the same concentration, δ-Na 2 Si 2 O 5 changed to a mixture of kanemite, Ca(OH) 2 and insoluble amorphous solid in water with Ca 2+ cations; a mixture of kanemite and insoluble amorphous solid in water with Mg 2+ cations. The evidence which δ-Na 2 Si 2 O 5 partly transport to another ion exchangeable single layer silicate (kanemite) indicated the existence of cation exchange on δ-Na 2 Si 2 O 5 . Another evidence which δ-Na 2 Si 2 O 5 partly dissolve and react with Ca 2+ and Mg 2+ cations indicated the existence to form precipitation. The experimental data suggested that the divalent cation binding process of δ-Na 2 Si 2 O 5 belongs to a mixture process with divalent cations exchange with Na + cation and precipitation in form of insoluble amorphous solid.