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Hercigonja, Radmila V; Vranjes-Djuric, Sanja D; Mirkovic, Marija D; Markovic, Bojana M; Maksin, Danijela D; Markovic, Bojana N; Nastasovic, Aleksandra B
Journal of radioanalytical and nuclear chemistry, 07/2018, Letnik: 317, Številka: 1Journal Article
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 K.sub.d value (2.06 x 10.sup.-4 cm.sup.3 g.sup.-1) was achieved using CoY (zeolite type Y). The kinetics of technetium adsorption followed the pseudo-second order model. The TcO.sub.2 adsorption is mainly due to the hydrogen bonds between protons of the zeolitic structural OH groups (Bronsted acid center) and oxygen from the TcO.sub.2.sup.-.
