Radiotracer investigation on sorption behavior of chromium(VI) on antimony trioxide: Kinetic and infrared study
- Indian Inst. of Technology, New Delhi (India)
The sorption of Cr(VI) ions on antimony trioxide has been investigated over a wide range of pH (0.5-10), concentration (10{sup -6}-10{sup 22}M), and temperature (303-333 K) by using the radiotracer technique. The effect of pH on sorption of Cr(VI) on Sb{sub 2}O{sub 3} is explained in the light of the deprotonation/hydroxyl ion association reaction on the oxide surface and its subsequent interaction with the tracer. The rate of sorption of Cr(VI) is faster in the beginning, becomes slower with a lapse of time, and finally approaches a plateau within ca. 15 min. Sorption is found to increase with an increase in concentration and decrease in temperature. The kinetics of the process essentially follows the first-order rate law and obeys the Freundlich isotherm. The value of the activation energy for the desorption process is found to be greater than that for the sorption process. The calculated thermodynamic parameters confirm the spontaneity and exothermic nature of sorption process and suggest some structural changes in the surface morphology. IR spectroscopy corroborates the existence of interaction between Cr(VI) species and the surface of antimony trioxide. 25 refs., 8 figs., 4 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 391266
- Journal Information:
- Langmuir, Journal Name: Langmuir Journal Issue: 8 Vol. 8; ISSN LANGD5; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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