By Reza Sabet Dariani
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Extra info for Microporous and Mesoporous Materials
The greater adsorption of heavy metals onto zeolite bearing tuff–– stilbite, when compared to natural zeolite––clinoptilolite, may be due to the higher porosity of zeolite bearing tuff. Equilibrium studies show that adsorption of lead and zinc ions strongly depends on the initial concentration. As the initial concentration of heavy metal cations increases, the amount of metal adsorbed per gram of adsorbent (qe) increases. The Langmuir isotherms for the adsorption of lead and zinc from solution gave better fits of the experimental results than the Freundlich isotherms.
Online]. shtml. , C. Baerlochek, “Zeolite structures,” in Introduction to Zeolite Science and Practice, Elsevier, 2001. , Dutta P. , “Zeolites: A primer,” in Handbook of Zeolite Science and Technolo‐ gy, Marcel Dekker, 2003. , Meier W. , Olson D. , Atlas of Zeolite Framework Types, 6th Edition, Elsevier, 2007. , Molecular Sieves: Principles of Synthesis and Identification, 2nd Edition, Thomson Science, 1998. , “Exploration of remediation of acid rock drainage with clinoptilolite as sorbent in a slurry bubble column for both heavy metal capture and regeneration,” Water Research, vol.
Zeolites are also characterized by the unique property that the internal surface is highly accessible and can compose more than 98% of the total surface area. Surface area is typically of the order of 300–700 m2/g . Thermal stability of zeolites varies over a large temperature range. The decomposition temperature for low-silica zeolites (Si/Al ratio ≈ 1) is ~700°C, whereas completely siliceous zeolite, such as silicalite, is stable up to 1300 °C. Low-silica zeolites are unstable in acid, whereas high-silica zeolites (Si/Al ratio ≥ 10) are stable in boiling mineral acids, though unstable is basic solutions.