Equilibrium and rates of ammonium ion exchange by clinoptilolite

Autor:	Motoyuki Suzuki, Kl-SUNG Ha
Rok vydání:	1984
Předmět:	chemistry.chemical_compound Clinoptilolite Adsorption Ion exchange Chemistry General Chemical Engineering Diffusion Inorganic chemistry Ammonium General Chemistry Chemical equilibrium Zeolite Ion
Zdroj:	JOURNAL OF CHEMICAL ENGINEERING OF JAPAN. 17:139-145
ISSN:	1881-1299 0021-9592
DOI:	10.1252/jcej.17.139
Popis:	The fundamental relations such as equilibrium and intraparticle diffusion in removal of ammonium from wastewaters by natural zeolite are examined by using two different clinoptilolite samples collected from Korea and Japan. The selectivity coefficient of ammonium ion versus sodium ion in these materials defined from mass action law, ?? does not take a constant value as in the case of organic exchange resin, but varies with degree of exchange, YNH4+, in the zeolite. Then it can be correlated as: ?? Also, the intraparticle diffusion coefficient was determined from ion exchange measurement in a stirred tank. The effective diffusion coefficient of the two ions in clinoptilolite was evaluated as 4-5 × 10-12m2/s.
Databáze:	OpenAIRE
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