Influence of temperature on natural and chemically modified zeolites

Abstract

Zeolites from Ni~@ Hrabovec (Slovak Republic) were modified with solutions of NaOH. The changes of zeolites in the temperature range 20 1200 ~ were studied by thermal analysis (DTA, TG, ETA), X-ray analysis and REM analysis. Thermal analysis showed that the process of dehydration started between temperatures 20 and 600 ~ over this temperature the dealumination and structural changes have taken place. X-ray analysis and REM analysis showed the structural changes of natural zeolites and gradual loss of cristallinity of the chemically modified zeolites.

Cadmium leaching from thermal treated and gamma irradiated Mexican aluminosilicates

“…An alternative way to safely store radionuclides after entrapping them in an aluminosilicate framework is based on a thermal treatment that destroys the aluminosilicate structure and blocks the radioactive species into a vitreous lattice or a non-exchanging crystalline phase [10,11]. As these materials are intended to retain radionuclides, they will receive considerable heat decay and radiation doses over time, and the cumulative doses can be substantial.…”