Novel stannosilicates. Part 2. Cation-exchange studies

Abstract

The ion-exchange properties of a novel sodium stannosilicate Na_13.5Sn₁₀Si₁₅O₃₆(OH)₅·13.5H₂O have been studied for the replacement of Na⁺ by Li⁺, K⁺, Tl⁺, Ag⁺, NH₄⁺, Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺ and Zn²⁺. Thermodynamic parameters have been calculated from isotherm data, and lead to a general conclusion that the exchanges were of zeolite character and that the stannosilicate behave as a microporous solid with heteroenergetic exchange sites.