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    Evaluation of the performance of calix[8]arene derivatives as liquid phase extraction material for the removal of azo dyes
    (ELSEVIER SCIENCE BV, 2008) Gungor, Omer; Yilmaz, Aydan; Memon, Shahabuddin; Yimaz, Mustafa
    This pit per presents a study on the removal of azo dyes (Reactive Black 5, Trapaeolin 000, Methyl Orange and Direct Violet 51) with calix[n]arene derivatives from aqueous solution into the organic phase in order to explore the potential use of calixarenes as low-cost efficient extractants for wastewater dye removal. The carboxylic acid derivative of calix[8]arene shows highest affinity towards the azo dyes. The influence of NaCl (present in the solution) on extraction process was also Studied. The extent of the dye removal increased with the addition of NaCl. The proposed extraction mechanism involves several kinds of interactions: electrostatic repulsion between carboxylic acid groups of calix[8]arenes and sulfonate groups of azo dyes, hydrogen bonding and formation of an inclusion complex due to three dimensional cavity type calix[n]arene molecules through host-guest interactions. (C) 2008 Elsevier B.V. All rights reserved.
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    Transport of methylene blue through bulk liquid membrane containing calix[8]arene derivative
    (DESALINATION PUBL, 2014) Gubbuk, Ilkay Hilal; Gungor, Omer
    In this study, an experimental study on the transport of methylene blue ( MB) through bulk liquid membrane ( BLM) is done and thereby best set of solvent, operating conditions, and mode of transport that would yield optimum performance of the BLM are identified. Therefore, a kinetic study of MB transport from an aqueous donor phase into an aqueous acceptor phase through a BLM containing calix[8] arene octacarboxylic acid ( COCA) derivative as a carrier was studied. The influence of type of solvent, stirring speed, effect of NaCl weight in feed phase and temperature were investigated. The kinetic parameters ( k(1), k(2), R-m(max), t(max), J(d)(max), J(a)(max)) were calculated for the interface reactions assuming two consecutive, irreversible first-order reactions. In this study, the experiments demonstrated that COCA derivative is a good carrier for MB transport through liquid membranes.