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CHEMICALLY MODIFIED ZEOLITES: SURFACES AND INTERACTION WITH Cs AND Co

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Author(s): Mária Főldesová | Pavol Hudec | Pavel Dillinger

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 49;
Issue: 2;
Start page: 60;
Date: 2007;
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Keywords: Zeolite | Chemically modified zeolite | Surface and sorption properties | Volumetric method | Radioindicator method

ABSTRACT
Inorganic exchangers, including zeolites, have interesting properties such as resistance to decomposition in the presence of ionizing radiation or to high temperatures, what make them applicable for the purification of low and middle polluted radioactive waste waters. The research was focused on model radioactive waste effluents and the investigated metals were cobalt (Co) and cesium (Cs). The performance of natural zeolite of clinoptilolite type and zeolite chemically modified with NaOH solutions was determined by studying their surface and sorption properties using volumetric method and static radioindicator method. The measurements of zeolite´s surfaces showed the double increase of the specific surface along with an increase of mesopore’s diameter. The reason is the extraction of silicon from zeolite caused by NaOH solution what creates secondary mesoporous structure. The radioactive tracer technique was used to evaluate sorption properties of zeolites and the best sorbent was selected based on KD, μ, Γ and S values. The sorption abilities of natural and chemically modified zeolites for Cs uptake were comparable. The uptake of Co with natural zeolite was negligible and it increased up to 14 times for modified zeolites depending on the concentration of treated NaOH solution.
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