RETRACTED: Immobilization of 5-amino-1,3,4-thiadiazole-thiol onto analogue of heulandite for divalent toxic metals removal (Retracted article. See vol. 14, pg. 1986, 2011)

The compound 5-amino-1,3,4-thiadiazole-thiol was anchored onto analogue of heulandite by heterogeneous route. The original (HEU) and modified heulandite (HEUATT) samples were characterized through elemental analysis and nuclear magnetic nuclei of carbon-13 and silicon-29. The ability of these materials to remove Mn(II), Zn(II) and Pb(II) from aqueous solution was followed by a series of adsorption isotherms adjusted to a Sips equation. To achieve the best adsorption conditions the influence of pH and contact time were investigated. Based on the capacity of adsorption of HEUATT to interact with metal ions, the following results were obtained 13.0, 10.1 and 7.4 mmol g(-1) for Pb(II), Zn(II) and Mn(II), respectively, reflecting a maximum adsorption order of Pb(II) > Zn(II) > Mn(II). The energetic effects caused by metal cation adsorption were determined through calorimetric titrations. (c) 2009 Published by Elsevier B.V.