Microreactor Extraction System with Macrocyclic Host Compounds for Rare Metal Recovery

Ohto, Keisuke; Kim, JeeYoung; Morisada, Shintaro; Maeki, Masatoshi; Yamashita, K.; Miyazaki, Masaya

doi:10.5188/ijsmer.20.92

Cited by 11 publications

(9 citation statements)

References 10 publications

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“…Furthermore, each droplet serves a large specific surface area. The combination of a short diffusion distance and a large specific surface area contribute to boosting the mass transfer process of chemicals from one phase to another phase [38].…”

Section: Droplet Microfluidic Devicementioning

confidence: 99%

Droplet Microfluidic Device for Rapid and Efficient Metals Separation Using Host-Guest Chemistry

Kurniawan¹,

Sathuluri²,

Ohto³

2020

Advances in Microfluidic Technologies for Energy and Environmental Applications

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Metals are pivotal elements in our daily life and industrial processes, to produce electronic devices, catalysts, smart materials and so on. However, they are mostly present as a mixture in the environment that makes their separation challenging over the past decade. Host-guest chemistry principle thoroughly has been used to design and synthesize thousands of organic receptors with high complexation ability and selectivity to certain metal ions. On the other hand, the droplet microfluidic device is well-known for its unique characteristics of fluid dynamics, such as large specific surface area and short diffusion distance making the process robust and efficient. Therefore, many reports of research employ host-guest chemistry of the droplet microfluidic system for the effective metal separation process. This chapter deals with up-to-date examples of the droplet microfluidic system application for separation of base and alkali metals, recovery of rare-earth and precious metals and removal of heavy metals either from the competitive metal system or from the real waste solution sample through solvent extraction techniques utilizing host-guest chemistry principle.

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Section: Droplet Microfluidic Devicementioning

confidence: 99%

Droplet Microfluidic Device for Rapid and Efficient Metals Separation Using Host-Guest Chemistry

Kurniawan¹,

Sathuluri²,

Ohto³

2020

Advances in Microfluidic Technologies for Energy and Environmental Applications

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“…Microreactor is a micro-scale system that employs a reaction process with small amounts of the reactants inside the microchannel having ten to hundred micrometers dimension [16]. The microreactor system has some merits, such as the large surface area per unit volume [17], short diffusion distance for the heterogeneous reaction [18], a reduced amount of reagent [19] and portable analysis [20]. Because of these, the microreactor has been widely applied in protein crystallization [21], organic synthesis [22] and solvent extraction [23].…”

Section: ■ Introductionmentioning

confidence: 99%

Separation of Pb(II) Ion with Tetraacetic Acid Derivative of Calix[4]arene by Using Droplet-based Microreactor System

et al. 2019

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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.

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“…Thus, the extremely fast extraction rate may be attributed to the interfacial activity. The effect of shaking time on extraction percentage of silver ion with MKTOC in 0.1 M nitric acid was already investigated by the batch-wise method, 26) and the data in 1 M nitric acid was added as shown in Fig.2(b). The silver extraction percentage was gradually increased with increasing shaking time in both nitric acid concentrations.…”

Section: Silver Extraction Ratementioning

confidence: 99%

“…However, silver extraction rates between two derivatives exhibited large difference. 26) In the present work, the further study was investigated to evaluate interfacial tension of 2-pyridyl, methyl ketonic and phenyl ketonic derivatives of p-t-octylcalix [4]arene and to further understand the relationship with extraction rate in nitrate media.…”

Section: Introductionmentioning

confidence: 99%

Effect of Interfacial Activity on Silver Extraction Rate with Calix[4]arene Derivatives in Nitrate Media

Kim¹,

Morisada²,

Kawakita³

et al. 2014

J.I.E.

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arene derivatives as extraction reagents have been prepared to investigate silver extraction rate in nitrate media by batch-wise method. The interfacial tension was also measured by the drop volume method to investigate the effect of interfacial activity on silver extraction rate with the calix[4]arene derivatives in chloroform / nitric acid media by varying the concentrations of the extraction reagent and nitric acid. Interfacial activities of calix[4]arene derivatives were evaluated by comparing the obtained interfacial tension values. The interfacial excess and the average area per the adsorbed extractant molecule at chloroform / nitric acid interface were estimated from the Gibbs' adsorption equation and were used to investigate the relationship with silver extraction by using calix [4]arene derivatives in nitrate media. From the result, silver extraction rate with calix[4]arene derivatives in nitrate media was significantly related to their interfacial activities.

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Microreactor Extraction System with Macrocyclic Host Compounds for Rare Metal Recovery

Cited by 11 publications

References 10 publications

Droplet Microfluidic Device for Rapid and Efficient Metals Separation Using Host-Guest Chemistry

Droplet Microfluidic Device for Rapid and Efficient Metals Separation Using Host-Guest Chemistry

Separation of Pb(II) Ion with Tetraacetic Acid Derivative of Calix[4]arene by Using Droplet-based Microreactor System

Effect of Interfacial Activity on Silver Extraction Rate with Calix[4]arene Derivatives in Nitrate Media

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