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Droplet-based microreactor system for stepwise recovery of precious metal ions from real metal waste with calix[4]arene derivatives |
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| Authors: | Ramachandra Rao Sathuluri Yehezkiel Steven Kurniawan Jee Young Kim Masatoshi Maeki Wataru Iwasaki Shintaro Morisada |
| Affiliation: | 1. Department of Chemistry and Applied Chemistry, Saga University, Saga, Japan;2. Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tosu, Saga, Japan;3. Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita, Sapparo, Japan;4. Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tosu, Saga, Japan |
| Abstract: | ABSTRACTStepwise recovery of silver(I), palladium(II) and platinum(IV) with suitable calix[4]arene extractants was carried out by investigating the extraction and stripping process using a droplet-based microreactor system. The highest percentages of silver, palladium (100%) and platinum ion (37.2%) were extracted from a real waste only within 4.00s using a microreactor system compared with 24 and 72 h to reach extraction equilibrium in a batch method. Fourier transform infrared spectroscopy studies revealed a very good relation in peak shifts on the metal complexation with calix[4]arene derivatives after extraction and stripping. The droplet-based microreactor system emerges as an effective tool to be applied in metal recovery. |
| Keywords: | Calix[4]arene microreactor precious metal real waste stepwise recovery |