Metadata of CSIR Papers
View Archive Info| Field | Value | |
| Creator |
Chennakesavulu, K
Raju, GB Prabhakar, S |
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| Subject |
Chemistry
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| Description |
p-tert-butyl calix[6]arene (PTC6) was synthesized and characterized by solid- and liquid-state NMR and LC-MS techniques. The adsorption of arsenite and arsenate on calix[6]arene under different pH conditions and adsorbate doses was studied. The maximum adsorption of arsenic species on calix[6]arene was observed around neutral pH and the adsorption density of As (Ill) was higher than that of As (V). The adsorption of neutral H(3)AsO(3) and negatively charged H(2)AsO(4)(-) molecules on calix[6]arene was attributed to the condensation reaction between hydroxyl groups of PTC6 and arsenic species. The complexation of arsenite with phenolic oxygen was confirmed by solid-state (13)C NMR CP-MAS. Exo attack mechanism was proposed to describe the interaction of arsenous and arsenic acid molecules with PTC6. The specific interaction between calix[6]arene and arsenic species was further substantiated by zeta-potential (zeta-potential) measurements and free energy of adsorption. The free energy of adsorption (Delta G(ads)degrees) estimated from Stern-Grahame equation was found to be 25 kJ/mole for As (Ill) and 19 kJ/mole for As (V). Copyright (C) 2010 John Wiley & Sons, Ltd.
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| Publisher |
JOHN WILEY & SONS LTDCHICHESTERTHE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND
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| Date |
2011-09-20T11:59:53Z
2011-09-20T11:59:53Z 2010 |
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| Type |
Article
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| Identifier |
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
0894-3230 http://hdl.handle.net/123456789/11384 |
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| Language |
English
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