Modified Zeolites: Pretreatment of Natural Zeolites by Use of Inorganic Salts

Pretreatment of natural zeolites covers a wide range of modification techniques leading in several products to a variety of applications. A very common pretreatment type is used for producing modified zeolites for use in ion exchange applications and in particular for the removal of cations from aqu...

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Bibliographic Details
Published inHandbook of Natural Zeolites Vol. 1; no. 1; pp. 156 - 165
Main Author J. Inglezakis, Vassilis
Format Book Chapter
LanguageEnglish
Published 01.08.2012
Subjects
effective capacity
ion exchange capacity
chemical treatment
physical treatment
inorganic salts
modified zeolites
homoionic zeolite
Pretreatment
modification
maximum exchange level
breakthrough capacity
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Summary:Pretreatment of natural zeolites covers a wide range of modification techniques leading in several products to a variety of applications. A very common pretreatment type is used for producing modified zeolites for use in ion exchange applications and in particular for the removal of cations from aqueous solutions. In these cases, pretreatment aims to remove certain ions from the structure of the material and locate more easily removable ones, prior to any ion exchange application. Practically, the result of any pretreatment operation is the increase of the content in a single cation, what is called homoionic form. The final homoionic or near homoionic state of the zeolites improves the effective exchange capacity and performance in ion exchange applications.
DOI:10.2174/978160805261511201010156