Loading...
Please wait, while we are loading the content...
Magnetic Dye-Adsorbent Catalyst: A “Core-Shell” Nanocomposite
| Content Provider | Semantic Scholar |
|---|---|
| Author | Shukla, Satyajit Suresh, K. G. Varma, Manoj Raama Warrier K. G. K. |
| Copyright Year | 2010 |
| Abstract | Hydrogen titanate nanotubes have been processed via hydrothermal using the commercially available nanocrystalline anatase-titania powder as a precursor. The samples have been characterized using TEM, XRD, and BET to determine the product morphology, structure, and specific surface-area, and have been utilized for a typical industrial application involving the removal of an organic-dye from an aqueous solution via surfaceadsorption mechanism under the dark-condition. The dyeadsorption kinetics of hydrogen titanate nanotubes has been compared with that of the as-received anatase-titania nanoparticles. The nanotube morphology has been observed to play a significant role in enhancing the dye-adsorption kinetics under the dark-condition. In order to ease the separation of nanotubes after the dye-adsorption process, a magnetic dye-adsorbent catalyst has been developed. It consists of a nanocomposite particle having a “coreshell” structure, with a magnetic ceramic particle as a core and dye-adsorbent hydrogen titanate nanotubes as a shell. Due to the presence of nanotubes on the surface, the magnetic dye-adsorbent catalyst possesses an enhanced specific surface-area relative to that of the conventional magnetic photocatalyst. As a result, the former has been successfully utilized to remove an organic-dye from an aqueous solution via surface-adsorption mechanism, under the dark condition (energy-independent process), while simultaneously possessing the ferromagnetic property required for its separation, from the treated solution, using an external magnetic field. It is demonstrated that, under the given test-conditions, the magnetic dye-adsorbent catalyst removes almost ~100% of an organic-dye from an aqueous solution in dark in just 30 min, where as the conventional magnetic photocatalyst removes only ~40-55% of an organic-dye in 3 h via surface-adsorption mechanism. A surface-cleaning treatment has been developed for reusing the magnetic dye-adsorbent catalyst by removing the previously adsorbed organic-dye from its surface. The dye-adsorption and surface-cleaning treatment have been demonstrated by monitoring the variation in the original color of the catalyst-powder during the test. |
| Starting Page | 830 |
| Ending Page | 833 |
| Page Count | 4 |
| File Format | PDF HTM / HTML |
| Volume Number | 1 |
| Alternate Webpage(s) | https://briefs.techconnect.org/wp-content/volumes/Nanotech2010v1/pdf/1564.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
