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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Srivastava, Bhavya Barman, Milan K. Chatterjee, Mousumi Mandal, Bhabatosh |
| Copyright Year | 2015 |
| Abstract | A quick and facile synthesis of a mesoporous (pore diameter = 46.2–47.1 nm) material (FSG-EBT) through the immobilization of azo dye (EBT) on functionalized silica gel (FSG) has been achieved. FSG-EBT simultaneously binds two different metal centers, Zr(IV) and Tl(I) at their high and low oxidation states, respectively. Highest occupied molecular orbital (HOMO) of the extractor binds Zr(IV) with a breakthrough capacity (BTC) of 490 μmol g−1 and its lowest unoccupied molecular orbital (LUMO) extracts Tl(I) (BTC = 120 μmol g−1). The LUMO has thus enhances the BTC of the resin as a whole. This binding mode sequence differs from earlier existing mode of binding where extractors bind metals using HOMO and LUMO operative on the same metal centre only. HOMO/LUMO value (μmol g−1) reiterates itself as a definite quantum mechanical descriptor of BTC, and BTC is a definite descriptor of the state of metal (monomer/polymer) sorbed. The synthesis needs no stringent reaction condition such as refluxing. Its corresponding nanomaterial has been well assessed (composition: [Si(OSi)3(OH)·xH2O]n[–Si(CH3)2–NH–C6H4–NN–EBT]4; structure: tetrahedral) and is reiterated by density functional theory (DFT) calculation. Along with its good extractor qualities [high pore volume, PV = 0.3747 cm3 g−1; surface area, SA = 330.97 m2 g−1; BTC (Q0 = 476.7 μmol g−1); column efficiency, CE = 296 and preconcentration factor, PF = 120.20 ± 0.04; reusability > 1000 cycles; and faster rate of sorption–desorption], FSG-EBT possesses well demarcated spatial placement of HOMO–LUMO with a substantial band gap (η = 7.1471 eV). This makes charge recombination by mixing difficult and thus shows its potential applicability as a good donor–acceptor organic electronic device. |
| Starting Page | 55686 |
| Ending Page | 55703 |
| Page Count | 18 |
| File Format | HTM / HTML PDF |
| ISSN | 20462069 |
| Volume Number | 5 |
| Issue Number | 69 |
| Journal | RSC Advances |
| DOI | 10.1039/c5ra07103h |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Molecular orbital HOMO\/LUMO Carrier generation and recombination LUMO HOMO Electronvolt Polymer Quantum tunnelling BTC Mesoporous material Azo compound Zirconium EBT Resin Density functional theory Silica gel OSI model Band gap Monomer |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
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