Insight into the PEG-linked bis-imidazolium bridged framework of mesoporous organosilicas as ion exchangers
| Autor: | Manish Kumar Dinker, Prashant S. Kulkarni |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Ammonium bromide
Thermogravimetric analysis Materials science Inorganic chemistry Cationic polymerization 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Chloride 0104 chemical sciences chemistry.chemical_compound Mesoporous organosilica chemistry Solid-state nuclear magnetic resonance Chemical engineering Mechanics of Materials Ionic liquid medicine General Materials Science 0210 nano-technology Hybrid material medicine.drug |
| Zdroj: | Microporous and Mesoporous Materials. 230:145-153 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2016.05.008 |
| Popis: | Development of novel periodic mesoporous organosilicas (PMOs) were carried out by designing precursor, PEG-linked bis-imidazolium chloride bridged silsesquioxanes (PIMAILS, an ionic liquid). The involvement of tetraethyl ortho silicate (TEOS) as a template in an acidic medium led to the formation of a silica hybrid material (PMO-T). Contrary, in the absence of TEOS, PIMAILS self-assembled in a basic environment over the cationic surfactant, cetyl trimethyl ammonium bromide (CTAB) to form the silica hybrid material (PMO-S). The availability of surface silanols and ionic liquid (IL) in both the PMOs were verified using FT-IR and 13 C solid NMR. Further, they were quantified using 29 Si solid state NMR technique. The results depicted 3 times better loading of the precursor in the framework of PMO-S than PMO-T. Larger surface areas and higher porosities were found in PMO-S than PMO-T while analyzed using BET-BJH technique. Thermogravimetric (TG) analysis revealed nearly 2.2 times higher weight losses (%) from PMO-S than PMO-T, which validate the results of silica solid state NMR. Powder XRD analysis showed well-defined hkl reflections (110) and (200) from PMO-S in contrast of PMO-T, describing the periodic arrangement of IL within PMO-S. Finally ion-exchange capacities of these materials were estimated by employing them for recovery of W(VI). The PMO-S, which has higher percentage of IL in the framework, achieved better separation of W(VI) than PMO-T. |
| Databáze: | OpenAIRE |
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