Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10676993 | Applied Clay Science | 2005 | 12 Pages |
Abstract
The study reports the synthesis of zeolites from pre-treated coal fly ash in presence of a natural agricultural soil. The synthetic process of zeolites formation in soil was studied for a period of 6 months at 30 and 60 °C. The synthesis of zeolite P (zeolite belonging to the Gismondine series) and zeolite X (zeolite belonging to the Faujasite series) was observed for the first time directly in soil in the presence of organic matter (2.4% C) and several mineral phases. Zeolites were characterized and quantified by means of XRD and SEM-EDX analysis. Moreover, correlations between Si/Al molar ratio in solution, curing temperature and the type of synthesized zeolite were found. A Si/Al ratio lower than 1 and higher curing temperatures favored the synthesis of zeolite P, while a Si/Al higher than 1 and lower curing temperatures drove the synthesis preferentially towards zeolite X. The results obtained in the present research could be useful for a better comprehension and long-term assessment of the physical and chemical processes which are at the basis of many solidification/stabilization (S/S) soil remediation technologies for the stabilization of heavy metals or for the catalytic degradation of organic pollutants.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
R. Terzano, M. Spagnuolo, L. Medici, F. Tateo, P. Ruggiero,