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Separation Science and Technology Volume 53, 2018 - Issue 8: Separation Science: Theory and Practice 2016
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Original Articles

Droplet-based microreactor system for stepwise recovery of precious metal ions from real metal waste with calix[4]arene derivatives

Ramachandra Rao SathuluriDepartment of Chemistry and Applied Chemistry, Saga University, Saga, Japan;Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tosu, Saga, Japan
,
Yehezkiel Steven KurniawanDepartment of Chemistry and Applied Chemistry, Saga University, Saga, Japan
,
Jee Young KimDepartment of Chemistry and Applied Chemistry, Saga University, Saga, Japan
,
Masatoshi MaekiDivision of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita, Sapparo, Japan
,
Wataru IwasakiAdvanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tosu, Saga, Japan
,
Shintaro MorisadaDepartment of Chemistry and Applied Chemistry, Saga University, Saga, Japan
,
Hidetaka KawakitaDepartment of Chemistry and Applied Chemistry, Saga University, Saga, Japan
,
Masaya MiyazakiAdvanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tosu, Saga, Japan;Cool Earth Co. Ltd., Kushiro, Hokkaido, JapanORCID Iconhttp://orcid.org/0000-0003-4031-7224
ORCID Icon &
Keisuke OhtoDepartment of Chemistry and Applied Chemistry, Saga University, Saga, JapanCorrespondence[email protected]
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Pages 1261-1272 | Received 15 Jan 2017, Accepted 08 Aug 2017, Published online: 07 Sep 2017
 
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ABSTRACT

Stepwise 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.

Acknowledgements

We thank Ms Kazuma Matsuura, AIST Kyushu Center, for her assistance in the microreactor fabrication. This work was partially supported by “The Environment Research and Technology Development Fund, (No. 3K-123022) from the Ministry of Environment, Government of Japan” and partially by “Collaborative research expense of partner graduate school between Graduate School of Science and Engineering, Saga University and AIST Kyushu”.

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