EQUILIBRIUM AND RATES OF AMMONIUM ION EXCHANGE BY CLINOPTILOLITE

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Kl-SUNG HA¹  MOTOYUKI SUZUKI¹ 

[1] Institute of Industrial Science, University of Tokyo

关键词: Ion Exchange;    Adsorption;    Environment;    Mass Transfer;    Chemical Equilibrium;   

DOI  :  10.1252/jcej.17.139

来源: Maruzen Company Ltd

【 摘 要 】

References(14)Cited-By(7)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.

【 授权许可】

Unknown