Noviarty Noviarty, Dian Anggraini, Arif Nugroho


Cs ions
exchange process has been conducted on natural zeolite (from Bayah, Lampung, and Tasikmalaya) which
was activated with ammonium chloride. NH4-zeolite which was formed, is used to exchanger or absorber
material of Cs ions. The duration of ions exchange process was optimized by varying the stirring time of 1
hours, 2 hours, 3 hours, 4 hours, 5 hours, and 24 hours. In all three zeolite types was obtained the
optimization process time are the contact time of 1 hours. Cation exchange capacity (CEC) of natural zeolite
was determined by standard methods. Attempts to obtain a monocation zeolite as a NH4-zeolite effectively
acquired about 88% which used as a exchanger or absorber Cs ions. The effectiveness of Cs ions Cation
exchange capacity with the ammonium was determined by batch-exchange for 1 hour. The calculation result
o effectiveness CEC-Cs are 1.4269 Meq/gram ± 0.0397, RSD: 2.79% for Bayah zeolite, 1.4476 Meq/gram
± 0.0103, RSD: 0.71% for Lampung zeolite, 1.4044 Meq/gram ± 0.0050, RSD: 0.36% for Tasikmalaya
zeolite. Stability of Cs-zeolte bond against heat treatment was tested at temperature of 25°, 300°, 600 °,
900°, and 1200 °C. The result showed that the relea se of Cs-ions is not significant from zeolite structure.
The heating below 900°C, the release of Cs-ions jus t occurs on the surface (it was not change the initial of
zeolite structure), whereas above that temperature was occurs the changed of zeolite structure, although
there was not visible the release of Cs-ions on leaching process at the water. The conclusion is all three
types of natural zeolite was potentially to be used as Cs-ions isolate which is especially useful to absorbing
Cs-radioactive isotope as a result from fission of nuclear fuel element.

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