title: Kinetic aspects and swelling changes of magnesium and cerium titano-antimonates in aqueous and mixed solvents.
abstract: Magnesium titano-antimonate (MgTi5Sb2O16.-12.5H2O) and cerium titano-antimonate (Ce(2).(7)Ti5Sb2O19.-15.0H2O) were synthesized as new cation exchangers using the in situ precipitation technique. Physico-chemical investigations showed different behaviors for the obtained materials. The materials have significant stability at high acid concentration and temperature. The ion exchange capacity for Cs+ in the presence of different alcoholic solvents was found to increase and generally obey the order C2H5OH>CH3OH>H2O. Diffusion coefficients (Di) and thermodynamic parameters of Cs+ exchange in both magnesium and cerium titano-antimonates in aqueous and alcoholic solutions were calculated. The swelling ratios of the materials were predicted by applying modified calculations at constant values of Di. The results showed insignificant swelling behavior in the presence of organic solvents.
authors.affiliation: Hot Labs. Center, Atomic Energy Authority, P. Code No. 13759, Cairo, Egypt.
authors.forename: Essam S
authors.initials: ES
authors.lastname: Zakaria
authors.forename: Ismail M
authors.initials: IM
authors.lastname: Ali
authors.forename: Hisham F
authors.initials: HF
authors.lastname: Aly
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D000965:Antimony / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008274:Magnesium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D013816:Thermodynamics; D014414:Tungsten / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000438:Alcohols; D010087:Oxides; D012997:Solvents; D014867:Water; D002563:Cerium; D000965:Antimony; D008274:Magnesium; D014414:Tungsten