Separation of no-carrier-added radioactive scandium from neutron irradiated titanium |
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| Authors: | Tanveer Hussain Bokhari A Mushtaq Islam Ullah Khan |
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| Institution: | (1) Key Laboratory of Norhwest Water Rwsources and Enviromental Ecology of Education Ministry, Xi’an University of Technology, Xi’an, 710048, People’s Republic of China;(2) School of Life Science, ShaoXing University, ShaoXing, Zhejiang, 312000, People’s Republic of China;(3) Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei, People’s Republic of China; |
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| Abstract: | In this work, sorption of Ni(II) from aqueous solution to goethite as a function of various water quality parameters and temperature
was investigated. The results indicated that the pseudo-second-order rate equation fitted the kinetic sorption well. The sorption
of Ni(II) to goethite was strongly dependent on pH and ionic strength. A positive effect of HA/FA on Ni(II) sorption was found
at pH < 8.0, whereas a negative effect was observed at pH > 8.0. The Langmuir, Freundlich, and D-R models were applied to
simulate the sorption isotherms at three different temperatures of 293.15 K, 313.15 K and 333.15 K. The thermodynamic parameters
(ΔH
0, ΔS
0 and ΔG
0) were calculated from the temperature dependent sorption, and the results indicated that the sorption was endothermic and
spontaneous. At low pH, the sorption of Ni(II) was dominated by outer-sphere surface complexation or ion exchange with Na+/H+ on goethite surfaces, whereas inner-sphere surface complexation was the main sorption mechanism at high pH. |
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