Radiotracer technique in adsorption study—VII. Adsorption of iodide ions on chromium (IV) oxide powder

✍ Scribed by Shuddhodan P. Mishra; Shri Niwash Singh; Dhanesh Tiwary

• Publisher: Elsevier Science
• Year: 1991
• Weight: 687 KB
• Volume: 42
• Category: Article
• ISSN: 0883-2889
• DOI: 10.1016/0883-2889(91)90193-5

✦ Synopsis

The kmetics of adsorptron of todrde ions on chromium (IV) oxide has been studied as a function of concentratron (10~7-10-2 M), temperature (293-328 K) and pH value (3211.2) of the adsorptive solution employing the radiotracer technique. The kinetics of adsorption of iodtde ions follows the first order rate law and obeys the Freundhch isotherm. Exposure of the activated oxide adsorbent to neutrons and y-radratron from a (Ra-Be) neutron source having an integral neutron flux of 3.85 x IO6 neutrons/cm2/s and associated with a nominal y-dose of ca 172 rads/h results in a nominal increase in the rate of uptake for 24 h Irradiation and thereafter decreases substantially when the irradiation time is increased to 60 h. The kinetics of desorption of preadsorbed iodide ions on oxide surface in water as well as in potassium iodtde solutton also follows first order rate law, and amount released increases with the increase of temperature (303-323 K). The adsorption is deduced to be of the "activated" type