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Hidetaka Kawakita
Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1-Honjo, Saga 840-8502, Japan
Chemical Engineering, Chemistry & Bioengineering Chemistry

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New Trident Molecule with Phosphoric Acid Functionality for Trivalent Rare Earth Extraction Keisuke Ohto; Hiromasa Murashima; Hiroshi Murakami; Shintaro Morisada; Hidetaka Kawakita; Marco Wenzel; Jan J. Weigand; Karsten Gloe
Indonesian Journal of Chemistry Vol 17, No 3 (2017)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (451.774 KB) | DOI: 10.22146/ijc.26880

Abstract

Tripodal extraction reagent with three phosphoric acid groups, together with the corresponding monopodal molecule has been prepared to investigate some metals extraction behavior, in particular, trivalent rare earth elements (REEs). The tripodal reagent exhibited extremely high selectivity for metals with high valency such as Zr(IV), In(III), Lu(III), and Fe(III). Tripodal reagent also exhibited exceptionally high extraction ability compared with the corresponding monopodal one in the extraction of trivalent rare earths. The result for the stoichiometry of tripodal reagent to heavy rare earths showed the inflection point between Er (2:1 for a ligand with ion) and Tm (1:1). The extraction reactions were determined for all rare earths with both reagents. The extraction equilibrium constants (Kex), the separation factors (β), half pH values (pH1/2), difference half pH values (ΔpH1/2) for extraction of REEs with both reagents are estimated.
Separation of Pb(II) Ion with Tetraacetic Acid Derivative of Calix[4]arene by Using Droplet-based Microreactor System Yehezkiel Steven Kurniawan; Mizuki Ryu; Ramachandra Rao Sathuluri; Wataru Iwasaki; Shintaro Morisada; Hidetaka Kawakita; Keisuke Ohto; Masatoshi Maeki; Masaya Miyazaki; Jumina Jumina
Indonesian Journal of Chemistry Vol 19, No 2 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (207.762 KB) | DOI: 10.22146/ijc.34387

Abstract

In this study, the microreactor system was investigated and compared with the batch-wise system as rapid and effective extractive Pb(II) separation over Fe(III), Cu(II) and Zn(II) with tetraacetic acid calix[4]arene. By using a microreactor system, the Pb(II) extraction percentages reached the maximum of 73, 89 and 100% in 8 sec residence time at equilibrium pH of 2.00, 2.25 and 2.50, respectively. The stripping percentage was 92% at 8 sec residence time by using a microreactor system with 2.0 M HNO3 as a stripping reagent. Complete separation of Pb(II) over Fe(III), Cu(II) and Zn(II) ions with the tetraacetic acid calix[4]arene in a competitive metal system was achieved at pH 2.00. However, the batch system required 24 h to reach the equilibrium for both extraction and stripping processes. The results suggested that the microreactor system enhanced the Pb(II) extraction and stripping rate up to 104 times faster than the batch-wise system.
Co-Authors Hiromasa Murashima Hiroshi Murakami Jan J. Weigand Jumina Jumina Karsten Gloe Keisuke Ohto Keisuke Ohto Marco Wenzel Masatoshi Maeki Masaya Miyazaki Mizuki Ryu Ramachandra Rao Sathuluri Shintaro Morisada Wataru Iwasaki Yehezkiel Steven Kurniawan