naa a22 4500 510820050 CHVBK 20180411083527.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s11814-012-0175-0 doi (NATIONALLICENCE)springer-10.1007/s11814-012-0175-0 Selective removal mercury (II) from aqueous solution using silica aerogel modified with 4-amino-5-methyl-1,2,4-triazole-3(4H)-thion [Elektronische Daten] [Fariba Tadayon, Mohammad Saber-Tehrani, Shiva Motahar] Silica aerogel surface modifications with chelating agents for adsorption/removal of metal ions have been reported in recent years. This investigation reported the preparation of silica aerogel (SA) adsorbent coupled with metal chelating ligands of 4-amino-5-methyl-1,2,4-triazole-3(4H)-thion (AMTT) and its application for selective adsorption of Hg(II) ion. The adsorbent was characterized by Fourier transform infrared spectra (FTIR) and thermo gravimetric analysis (TGA) measurements, nitrogen physisorption and scanning electron microscope (SEM). Optimal experimental conditions including pH, temperature, adsorbent dosage and contact time have been established. Langmuir and Freundlich isotherm models were applied to analyze the experimental data. The best interpretation for the experimental data given by the Langmuir isotherm equation and the maximum adsorption capacity of the modified silica gel and silica aerogel was 142.85 and 17.24mgg−1, respectively. Thermodynamic parameters such as Gibbs free energy (ΔG o ), standard enthalpy (ΔH o ) and entropy change (ΔS o ) were investigated. The adsorbed Hg(II) on the SA-AMTT adsorbents could be completely eluted by 1.0M KBr solution and recycled at least four times without the loss of adsorption capacity. The results of the present investigation illustrate that modified silica aerogel with AMTT could be used as an adsorbent for the effective removal of Hg(II) ions from aqueous solution. Korean Institute of Chemical Engineers, Seoul, Korea, 2012 Mercury nationallicence Silica Aerogel nationallicence Removal nationallicence Selectivity nationallicence Adsorption nationallicence Tadayon Fariba Department of chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran aut Saber-Tehrani Mohammad Department of chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran aut Motahar Shiva Department of chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/3(2013-03-01), 642-648 0256-1115 30:3<642 2013 30 11814 https://doi.org/10.1007/s11814-012-0175-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-012-0175-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tadayon Fariba Department of chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran aut NATIONALLICENCE 700 1- Saber-Tehrani Mohammad Department of chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran aut NATIONALLICENCE 700 1- Motahar Shiva Department of chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/3(2013-03-01), 642-648 0256-1115 30:3<642 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer