Abstract
The adsorption behaviour of iodine on chemically modified swelling type of clays has been studied. Chemical modification was brought about by interacting the clay with surfactants such as tween-80 and polyethylene glycol. Adsorption of iodine was found to increase by several orders of magnitude on chemical modification which remained constant between pH 1 and 10. The adsorption isotherms were non-linear and fitted the Freundlich equation for swelling clays. Scatchard analysis of the data indicated minimum two types of active sites with the tween-80 modified clay and one type with the polyethylene glycol modified one. The iodine sorbed on the surface was found to get desorbed almost completely on leaching with water. Modification of the clay surface with surfactant thus offers a method of designing a recyclable adsorbent for iodine.
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References
Adeleye S A 1995J. Mater. Sci. 30 583
Adamson A 1987Physical chemistry of surfaces and interface science (New York: Publishers Inc.)
Bors J 1988Radiochimica Acta 44/45 201
Bors J 1992Radiochimica Acta 58/59 235
Bors J 1997Clay Miner. 32 21
Comans R N J and Hockley D E 1992Geochim. Cosmochim. Acta 56 1157
Desbene P L 1997J. Colloid & Interface Sci. 190 350
Lockhart N C 1981Clays & Clay Miner. 29 413
Mortland M M 1970Adv. Agron. 22 75
Mortland M M 1986Clays & Clay Miner. 34 581
Narine R and Guy R D 1982Soil Sci. 133 356
Rand M Set al 1975Standard methods for the examination of water and waste water (New York: American Public Health Association) 16th ed., p. 397
Sakai Yet al 1987Bull. Chem. Soc. Jpn 60 545
Sakai Yet al 1993Bull. Chem. Soc. Jpn 66 3107
Siobhan S and Roubaud M 1997Clays & Clay Miner. 45 251
Theng B K G 1974The chemistry of clay organic reactions (London: Hilger)
Zielke R G and Pinnavaia T J 1988Clays & Clay Miner. 36 403
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Krishna, B.S., Selvaraj, S., Mohan, B.V. et al. Chemically modified clays as recyclable adsorbents for iodine. Bull Mater Sci 21, 355–361 (1998). https://doi.org/10.1007/BF02744966
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DOI: https://doi.org/10.1007/BF02744966