Technetium removal from the aqueous solution using zeolites A and Y containing transition metal ions Co2+ and Zn2+
AuthorsHercigonja, Radmila V.
Mirković, Marija D.
Marković, Bojana M.
Maksin, Danijela D.
Marković, Bojana N.
Nastasović, Aleksandra B.
Article (Published version)
© 2018, Akadémiai Kiadó, Budapest, Hungary
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The adsorption properties of two zeolite types, faujasite (NaY, ZnY, CoY) and LTA-4A zeolite (NaA, ZnA, CoA), towards technetium were studied in batch static experiments. The Si/Al ratio, acidity, dealumination, chargebalance cations of zeolite, contact time and temperature determined the adsorption efficiency. The maximum removal efficiency of 98.8% and Kdvalue (2.06 × 10−4 cm3 g−1) was achieved using CoY (zeolite type Y). The kinetics of technetium adsorption followed the pseudo-second order model. The TcO2adsorption is mainly due to the hydrogen bonds between protons of the zeolitic structural OH groups (Bronsted acid center) and oxygen from the TcO2−.
Keywords:technetium / zeolite / Adsorption / kinetics
Source:Journal of Radioanalytical and Nuclear Chemistry, 2018, 317, 1, 215-225
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