Facile and Rapid Synthesis of a Dithiol-Protected Ag7 Quantum Cluster for Selective Adsorption of Cationic Dyes
| Autor: | Thalappil Pradeep, Megalamane S. Bootharaju |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
X ray diffraction
Energy dispersive analysis of X-rays X ray photoelectron spectroscopy Electrospray ionization Alumina Analytical chemistry Supported clusters Hydrogen bonds Absorption features Selective adsorption chemistry.chemical_compound Adsorption X-ray photoelectron spectroscopy Electrospray ionization mass spectrometry Electrochemistry General Materials Science Fourier transform infrared spectroscopy Spectroscopy Mass spectrometry Spectroscopic and microscopic techniques Stripping (dyes) Cationic polymerization Dithiol Surfaces and Interfaces Condensed Matter Physics chemistry Meso-2 3-dimercaptosuccinic acids Mercaptosuccinic acids Functional groups Absorption (chemistry) Scanning electron microscopy Transmission electron microscopy Photoelectrons Nuclear chemistry |
| Zdroj: | Langmuir. 29:8125-8132 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | We report a facile and rapid (less than 15 min) synthesis of atomically precise, dithiol-protected, silver quantum cluster, Ag7(DMSA) 4 (DMSA: meso-2,3-dimercaptosuccinic acid), through a modified solid state route. The as-synthesized cluster exhibits molecular optical absorption features with a prominent ?max at ?500 nm. Composition of the cluster was confirmed using various spectroscopic and microscopic techniques such as electrospray ionization mass spectrometry (ESI MS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive analysis of X-rays (EDAX). Clusters supported on neutral alumina have been shown as better adsorbents for selective adsorption of cationic dyes (over anionic dyes) from water. This selectivity for cationic dyes was evaluated by zeta potential (?) measurements. The efficiency of clusters for removal of dyes is very high when compared to nanoparticles (NPs) protected with ligands (citrate and mercaptosuccinic acid (MSA)) possessing similar chemical structures as that of DMSA. The higher efficiency of clusters for the removal of dyes is attributed to their smaller size and large surface area compared to the NPs in addition to favorable electrostatic interactions between the clusters and cationic dyes. Adsorption of dyes (cationic and anionic) was enhanced when dye molecules contain hydrogen bond forming functional groups. Supported clusters have been reused up to five cycles without the loss of activity once the adsorbed dye is extracted using suitable solvents. � 2013 American Chemical Society. |
| Databáze: | OpenAIRE |
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