New thiamine functionalized silica microparticules as a sorbent for the removal of lead, mercury and cadmium ions in aqueous media
| Autor: | Ece Kök Yetimoğlu, Neşe Taşci, Memet Vezir Kahraman, Sabahattin Deniz |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Sorbent
Metal ions in aqueous solution Inorganic chemistry chemistry.chemical_element heavy metal ions Environmental pollution 02 engineering and technology 010501 environmental sciences 01 natural sciences environmental remediation lcsh:Chemistry symbols.namesake chemistry.chemical_compound Adsorption 0105 earth and related environmental sciences Cadmium Silica gel Langmuir adsorption model General Chemistry 021001 nanoscience & nanotechnology AAS Gibbs free energy chemistry lcsh:QD1-999 adsorption symbols 0210 nano-technology |
| Zdroj: | Journal of the Serbian Chemical Society, Vol 82, Iss 2, Pp 215-226 (2017) |
| ISSN: | 1820-7421 0352-5139 |
| Popis: | The existence of heavy metal ions in aqueous media is one of the biggest environmental pollution problems and thus the removal of heavy metals is a very important procedure. In this work, a new adsorbent was synthesized by modifying 3-aminopropyl-functionalized silica gel with thiamine (vitamin B1) and characterized. The influence of the uptake conditions, such as pH, contact time, initial feed concentration and foreign metal ions, on the binding capacity of thiamine-functionalized silica gel sorbent (M3APS) were investigated. Maximum obtained adsorption capacities for Pb(II), Hg(II) and Cd(II) were 39.4?0.2, 30.9?0.5 and 9.54?0.4 mg g-1 M3APS, respectively, at pH 5.0. The observed selectivity of M3APS for these metal ions was the following: Pb(II) > Hg(II) > Cd(II). Adsorption isotherm models were also applied to the adsorption process. As a result, the Langmuir isotherm model gave the best fit for the adsorption of metal ions on M3APS. The Gibbs energy change (?G) for the adsorption of Pb(II), Hg(II) and Cd(II) were calculated to predict the nature of adsorption process. Having such satisfactory adsorption results, M3APS is a potential candidate adsorbent for Pb(II) and Hg(II) removal from aqueous media. |
| Databáze: | OpenAIRE |
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