Chennakesavulu, K and Bhaskar Raju, G and Prabhakar, S (2010) Studies on the adsorption of arsenic on Caliarene. Journal of Physical Organic Chemistry, 23 . pp. 723-729.
p-tert-butyl calixarene (PTC6) was synthesized and characterized by solid- and liquid-state NMR and LC-MS techniques. The adsorption of arsenite and arsenate on calixarene under different pH conditions and adsorbate doses was studied. The maximum adsorption of arsenic species on calixarene was observed around neutral pH and the adsorption density of As (III) was higher than that of As (V). The adsorption of neutral H3AsO3 and negatively charged H2AsOS4 molecules on calixarene 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 13C NMR CP-MAS. Exo attack mechanism was proposed to describe the interaction of arsenous and arsenic acid molecules with PTC6. The specific interaction between calixarene and arsenic species was further substantiated by zeta-potential (z-potential) measurements and free energy of adsorption. The free energy of adsorption (Gads) estimated from Stern–Grahame equation was found to be 25 kJ/mole for As (III) and 19 kJ/mole for As (V).
|Official URL/DOI:||http://DOI 10.1002/poc.1641|
|Uncontrolled Keywords:||free energy of adsorption, Arsenic, arsenate, adsorption, calix(6)arene, removal|
|Divisions:||NML Chennai > Mineral Processing|
|Deposited By:||Dr. G Bhaskar Raju|
|Deposited On:||26 Sep 2011 14:51|
|Last Modified:||14 Dec 2011 12:40|
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