Technetium removal from the aqueous solution using zeolites A and Y containing transition metal ions Co2+ and Zn2+
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AuthorsHercigonja, Radmila V.
Vranjes-Djuric, Sanja D.
Mirkovic, Marija D.
Markovic, Bojana N.
Article (Published version)
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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 K (d) value (2.06 x 10(-4) cm(3) g(-1)) was achieved using CoY (zeolite type Y). The kinetics of technetium adsorption followed the pseudo-second order model. The TcO2 adsorption 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
- Springer, Dordrecht
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