Industrial applications of molecular recognition technology to separations of platinum group metals and selective removal of metal impurities from process streams

Izatt, Reed M.; Izatt, Steven R.; Izatt, Neil E.; Krakowiak, Krzysztof E.; Bruening, Ronald L.; Navarro, Luis

doi:10.1039/c4gc02188f

Cited by 94 publications

(33 citation statements)

References 21 publications

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“…PM-06, PM-07, and PM-08) and AnaLig Pd-series (Pd-01 and Pd-02) as supplied by GL Sciences (Tokyo, Japan) were used. The SPE systems described to be equipped with macrocycles attached to the silica-gel base support [26] and claimed to possess selectivity towards a specific ion or group of ions from mixed matrices [27].…”

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confidence: 99%

Selective recovery of gold, palladium, or platinum from acidic waste solution

Hasegawa

Barua

Wakabayashi

et al. 2018

Microchemical Journal

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End-of-life electrical and electronic equipment is the potential secondary resource for economically-viable precious metals (PMs), e.g., gold (Au), palladium (Pd), or platinum (Pt). The hydrometallurgical processes produce acidic leachates during the recovery of PMs from waste sources, while the selective recovery of Au, Pd, or Pt from such a matrix is challenging either due to the chemical similarities of elements or complexities in the sources and matrices. A total of nine solid-phase extraction (SPE) systems, all claimed to designed for separation of PMs from complex matrices, was evaluated at varying solution pH (≤ 2 to 10) based on the selectivity towards Au, Pd, or Pt. The observation was used to develop a technique for selective Au, Pd, or Pt separation from acidic waste solutions using a macrocycle-equipped SPE. The feed solution flow-rates, eluent-type or compositions has been optimized to achieve maximum separation efficiency of the target analytes. The relative affinity of the macrocycles in solid-phase toward the ions (Pd > Au > Pt) is the core phenomenon of the proposed technique, and the host-guest type interaction is expected to be more stable than the resinbased separation processes. Furthermore, application of the macrocycle-equipped SPE system is advantageous regarding economics as it minimizes the impact of coexisting ions in the matrix and provides unaltered separation performance for several loading-elution cycles.

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mentioning

confidence: 99%

Selective recovery of gold, palladium, or platinum from acidic waste solution

Hasegawa

Barua

Wakabayashi

et al. 2018

Microchemical Journal

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“…However, due to the adding of the neural network training, a lot of samples were required and the calculation cost was huge, with poor practicality. At the same time, in both aforementioned works, they were only experimental platforms, which were not really applied to the mobile phone or other mature smart mobile platforms. As Windows Phone system and Windows system program has good portability, there are some studies based on Windows Phone.…”

Section: Related Workmentioning

confidence: 99%

“…PicId1, picId2, and picId3 represent the file names of the collected images of each person's face training samples, respectively, and the local storage path of the collected pictures and the local storage path of the sample descriptors can be constructed. 2 Picture operation Mainly the access, zoom, and rotation of the images, etc. Image storage and reading are general file operations.…”

Section: ) Data Storage Modulementioning

confidence: 99%

Mobile payment recognition technology based on face detection algorithm

2018

Concurrency and Computation

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Summary In view of the problem that the traditional face recognition algorithm cannot be effectively applied to the identification of mobile payment, a lightweight improvement scheme of the dynamic heteroscedasticity based on the classical scale transformation algorithm is proposed, which can automatically study and adaptively add the reliable test samples to the training sample space, with reasonable division and scientific weight distribution characteristics, so that the scheme can improve both the recognition rate and running time. The improved algorithm is tested in the ORL face database and Yale face database, respectively, with the recognition rate improved by 6.13% and 14.11%, and the operating efficiency increased by 9.1% and 4.7%, respectively, compared with the classic scale transformation algorithm. The recognition rate in the ORL face database has achieved 74.05%, with significant improvement compared with PCA, LBP, and other classic algorithms. And the mobile payment scheme is implemented in Android smart phones. The experimental data has verified the feasibility of the improved algorithm in the Android system. Finally, an improved scheme based on the cloud architecture is proposed.

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“…This selective host-guest interaction was quantitated and its range expanded to other macrocycles by Izatt et al [74,75] and others [76]. Early work by Izatt and coworkers with selective transport of metal ions in supported liquid membrane systems [77] led to the development of solid supported SuperLig ® systems (IBC Advanced Technologies, American Fork, UT, USA) in which the metal-selective ligand was attached by a tether to a solid support, such as silica gel [78]. This achievement made large scale, selective metal separations possible [79].…”

Section: Mrt-molecular Recognition Technologymentioning

confidence: 99%

On the Extraction of Rare Earth Elements from Geothermal Brines

2017

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The availability of rare earth elements from primary resources has come into question in the last two decades. This has sparked various government and industry initiatives to examine potential rare earth element resources apart from virgin ore bodies. Geothermal fluids are potentially significant sources of valuable minerals and metals, while co-recovery with geothermal energy production would be an attractive sustainable system. In this work, we give a brief survey of data collected on rare earth element concentrations in geothermal fluids. A survey of methods and technologies for extracting rare earth elements from geothermal is discussed along with the feasibility of recovering rare earth elements from geothermal brines. Based on the findings of this study, rare earth element extraction from geothermal fluids is technically possible, but neither economically viable nor strategically significant at this time.

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Industrial applications of molecular recognition technology to separations of platinum group metals and selective removal of metal impurities from process streams

Abstract: Selective precious and specialty metal separations and recovery using molecular recognition processes are described for commercial mining and recycling operations.

Cited by 94 publications

References 21 publications

Selective recovery of gold, palladium, or platinum from acidic waste solution

Selective recovery of gold, palladium, or platinum from acidic waste solution

Mobile payment recognition technology based on face detection algorithm

On the Extraction of Rare Earth Elements from Geothermal Brines

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