scholarly journals Direct Recovery of the Rare Earth Elements Using a Silk Displaying a Metal-Recognizing Peptide

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 761
Author(s):  
Nobuhiro Ishida ◽  
Takaaki Hatanaka ◽  
Yoichi Hosokawa ◽  
Katsura Kojima ◽  
Tetsuya Iizuka ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Industrial Wastewater ◽  
Recovery Process ◽  
Advanced Materials ◽  
Mixed Solution ◽  
Transgenic Silkworm ◽  
Additional Energy ◽  
Gene Coding ◽  
Recovery Approach

Rare earth elements (RE) are indispensable metallic resources in the production of advanced materials; hence, a cost- and energy-effective recovery process is required to meet the rapidly increasing RE demand. Here, we propose an artificial RE recovery approach that uses a functional silk displaying a RE-recognizing peptide. Using the piggyBac system, we constructed a transgenic silkworm in which one or two copies of the gene coding for the RE-recognizing peptide (Lamp1) was fused with that of the fibroin L (FibL) protein. The purified FibL-Lamp1 fusion protein from the transgenic silkworm was able to recognize dysprosium (Dy3+), a RE, under physiological conditions. This method can also be used with silk from which sericin has been removed. Furthermore, the Dy-recovery ability of this silk was significantly improved by crushing the silk. Our simple approach is expected to facilitate the direct recovery of RE from an actual mixed solution of metal ions, such as seawater and industrial wastewater, under mild conditions without additional energy input.

scholarly journals Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1144
Author(s):  
Laihao Yu ◽  
Yingyi Zhang ◽  
Tao Fu ◽  
Jie Wang ◽  
Kunkun Cui ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Rare Earth Elements ◽  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Strengthening Mechanism ◽  
Advanced Materials ◽  
Performance Requirements ◽  
Large Numbers ◽  
The One

Traditional refractory materials such as nickel-based superalloys have been gradually unable to meet the performance requirements of advanced materials. The Mo-Si-based alloy, as a new type of high temperature structural material, has entered the vision of researchers due to its charming high temperature performance characteristics. However, its easy oxidation and even “pesting oxidation” at medium temperatures limit its further applications. In order to solve this problem, researchers have conducted large numbers of experiments and made breakthrough achievements. Based on these research results, the effects of rare earth elements like La, Hf, Ce and Y on the microstructure and oxidation behavior of Mo-Si-based alloys were systematically reviewed in the current work. Meanwhile, this paper also provided an analysis about the strengthening mechanism of rare earth elements on the oxidation behavior for Mo-Si-based alloys after discussing the oxidation process. It is shown that adding rare earth elements, on the one hand, can optimize the microstructure of the alloy, thus promoting the rapid formation of protective SiO2 scale. On the other hand, it can act as a diffusion barrier by producing stable rare earth oxides or additional protective films, which significantly enhances the oxidation resistance of the alloy. Furthermore, the research focus about the oxidation protection of Mo-Si-based alloys in the future was prospected to expand the application field.

Selective and fast recovery of rare earth elements from industrial wastewater by porous β-cyclodextrin and magnetic β-cyclodextrin polymers

2020 ◽  
Vol 181 ◽  
pp. 115857 ◽  
Author(s):  
François Nkinahamira ◽  
Alaaeddin Alsbaiee ◽  
Qiaoting Zeng ◽  
Yan Li ◽  
Yiqing Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Industrial Wastewater ◽  
Fast Recovery ◽  
Cyclodextrin Polymers

Biorecovery of Rare Earth Elements: Potential Application for Mine Water Remediation

2015 ◽  
Vol 1130 ◽  
pp. 543-546 ◽  
Author(s):  
A.J. Murray ◽  
Sarah Singh ◽  
M.R. Tolley ◽  
L.E. Macaskie
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Inorganic Phosphate ◽  
Large Scale ◽  
Recovery Process ◽  
Bacterial Biofilm ◽  
Water Remediation ◽  
Complex Nature ◽  
Secondary Sources ◽  
Phosphate Source

Rare earth elements (REEs) are highly valuable due to the complex nature of their extraction from primary and secondary sources. A key feature is that REEs often co-occur with uranium and thorium which, being radioactive, increase the hazard and complexity of REE recovery. A bioprocess which utilizes enzymatically-generated inorganic phosphate to precipitate REEs from solution as their phosphate biominerals is highly effective in the recovery of REEs, effecting rapid recovery onto immobilized bacterial biofilm at high flow-through rates. This also bioprecipitates U and Th. The metal recovery process requires addition of an organic phosphate substrate, e.g. glycerol 2-phosphate (G2P), the cleavage of which provides the inorganic phosphate source for REE biomineralization. G2P is expensive, precluding its large scale use, but early work using uranium showed that tributyl phosphate (TBP) can be used as an alternative phosphate donor molecule. The potential for substitution of G2P by TBP for biorecovery of neodymium is described and a new approach is proposed for enhancing the metal selectivity for REEs against uranium.

The synergistic extraction of heavy rare earth elements using EHEHP-type and BTMPP-type functional ionic liquids

RSC Advances ◽  
2015 ◽  
Vol 5 (61) ◽  
pp. 49500-49507 ◽  
Author(s):  
Xiaoqi Sun ◽  
Yamin Dong ◽  
Yanliang Wang ◽  
Yujun Chai
Keyword(s):  
Ionic Liquids ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Synergistic Extraction ◽  
Advanced Materials ◽  
Heavy Rare Earth ◽  
Heavy Rare Earth Elements

Heavy rare earth elements (HREEs) are critical for many advanced materials. The synergistic extraction based on EHEHP-type and BTMPP-type bifunctional ionic liquids for HREEs separation is studied in this paper.

scholarly journals Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

2021 ◽  
Author(s):  
Laihao Yu ◽  
Yingyi Zhang ◽  
Tao Fu ◽  
Jie Wang ◽  
Kunkun Cui ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Rare Earth Elements ◽  
Oxidation Behavior ◽  
Strengthening Mechanism ◽  
Advanced Materials ◽  
Performance Requirements ◽  
Large Numbers ◽  
High Temperature Structural Material ◽  
New Type

Traditional refractory materials such as nickel-based superalloys have been gradually unable to meet the performance requirements of advanced materials. The Mo-Si-based alloy, as a new type of high temperature structural material, has entered the vision of researchers due to its charming high temperature performance characteristics. However, its easy oxidation and even "pesting oxidation" at medium temperatures limit its further applications. In order to solve this problem, researchers have conducted large numbers of experiments and made breakthrough achievements. Based on these research results, the effects of rare earth elements like La, Hf, Ce and Y on the microstructure and oxidation behavior of Mo-Si-based alloys were systematically reviewed in the current work. Meanwhile, this paper also provided an analysis about the strengthening mechanism of rare earth elements on the oxidation behavior for Mo-Si-based alloys after discussing the oxidation process. Furthermore, the research focus about the oxidation protection of Mo-Si-based alloys in the future was prospected to expand the application field.

scholarly journals Adsorption methods for the extraction and seperation of rare earth elements. Review

2021 ◽  
Vol 318 (3) ◽  
pp. 12-23 ◽  
Author(s):  
T.K. Jumadilov ◽  
◽  
Kh. Khimersen ◽  
B. Totkhuskyzy ◽  
J. Haponiuk ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Metal Ions ◽  
Industrial Wastewater ◽  
Rapid Development ◽  
Rare Earth Metals ◽  
High Technology ◽  
Cost Effective ◽  
Secondary Sources ◽  
Extraction And Separation

Rare earth elements play an important role in the production, energy, and high technology. Due to the rapid development of industry, the demand for rare earth metals is rising every day. Therefore, it is necessary to improve the extraction of rare earth metals from various sources to meet the demand for these elements. Currently, pyro- and hydrometallurgical technologies are used to extract rare earth metals from an ore and other secondary sources (industrial wastewater, acid drainage mines, etc.). Hydrometallurgical technologies include precipitation, extraction, adsorption, and ion exchange methods. Adsorption is one of the most effective methods for the extraction and separation of rare earth elements. Adsorption methods are highly selectivity to metal ions and have low emissions. However, not all adsorbents are effective in producing the same metal ions. This study provides an overview of the different adsorbents that can be used to extract rare earth elements from aquatic systems. Hydrogels and molecular polymers have been found to be cost-effective methods for high-grade rare earth metals. Further research is needed to ensure the performance of these systems.

Environmental and Economic Assessment of a Portable E-Waste Recycling and Rare Earth Elements Recovery Process

2021 ◽  
Author(s):  
Emmanuel Ohene Opare ◽  
Amin Mirkouei
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Large Scale ◽  
Electronic Waste ◽  
Electronic Devices ◽  
Economic Assessment ◽  
Recovery Process ◽  
Waste Recycling ◽  
High Tech ◽  
Regulatory Bodies

Abstract Over 40 million tons of electronic devices (e.g., computers, laptops, notebooks, and cell phones) became obsolete in 2020, and this estimate is expected to grow exponentially, mainly due to the decreasing lifespan of electronics. Most of the electronics replaced end up in municipal landfills. Electronic waste (e-waste) has raised concerns because many components in these products are not biodegradable and are toxic. Some of the toxic materials and chemicals include rare earth elements (REEs), which are currently experiencing supply constraints. This study focuses on generated e-wastes from households due to the high amount of these wastes. Technologies for e-waste mining must be tailored to household needs rather than large-scale industrial processes. The use of portable e-waste recovery systems may produce win-win outcomes where industry, households, and regulatory bodies could benefit, and this will incentivize e-waste mining for all stakeholders. This study investigates the sustainability benefits of employing a portable e-waste recycling and REEs recovery, using techno-economic and life cycle assessment methods. The results indicate that the proposed approach in this study mitigates environmental impacts when maleic acid is used as one of the key ingredients in recovering and separating REEs and other metals. It is concluded that when adopted globally, this technology can significantly address the e-waste challenge while improving the availability of REEs for high-tech applications.

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