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Golroudbary SR, Makarava I, Kraslawski A, Repo E. Global environmental cost of using rare earth elements in green energy technologies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 832:155022. [PMID: 35390387 DOI: 10.1016/j.scitotenv.2022.155022] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 03/17/2022] [Accepted: 03/31/2022] [Indexed: 06/14/2023]
Abstract
Decarbonization of economy is intended to reduce the consumption of non-renewable energy sources and emissions from them. One of the major components of decarbonization are "green energy" technologies, e.g. wind turbines and electric vehicles. However, they themselves create new sustainability challenges, e.g. use of green energy contributes to the reduction of consumption of fossil fuels, on one hand, but at the same time it increases demand for permanent magnets containing considerable amounts of rare earth elements (REEs). This article provides the first global analysis of environmental impact of using rare earth elements in green energy technologies. The analysis was performed applying system dynamics modelling methodology integrated with life cycle assessment and geometallurgical approach. We provide evidence that an increase by 1% of green energy production causes a depletion of REEs reserves by 0.18% and increases GHG emissions in the exploitation phase by 0.90%. Our results demonstrate that between 2010 and 2020, the use of permanent magnets has resulted cumulatively in 32 billion tonnes CO2-equivalent of GHG emissions globally. It shows that new approaches to decarbonization are still needed, in order to ensure sustainability of the process. The finding highlights a need to design and implement various measures intended to increase REEs reuse, recycling (currently below 1%), limit their dematerialization, increase substitution and develop new elimination technologies. Such measures would support the development of appropriate strategies for decarbonization and environmentally sustainable development of green energy technologies.
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Affiliation(s)
- Saeed Rahimpour Golroudbary
- School of Engineering Science, Industrial Engineering and Management (IEM), LUT University, FI-53851 Lappeenranta, Finland.
| | - Iryna Makarava
- School of Engineering Science, Department of Separation Science, LUT University, FI-53850 Lappeenranta, Finland; Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, D-09599 Freiberg, Germany.
| | - Andrzej Kraslawski
- School of Engineering Science, Industrial Engineering and Management (IEM), LUT University, FI-53851 Lappeenranta, Finland.
| | - Eveliina Repo
- School of Engineering Science, Department of Separation Science, LUT University, FI-53850 Lappeenranta, Finland
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Shi Z, Yong L, Liu Z, Wang Y, Sui H, Mao W, Zhang L, Li Y, Liu J, Wei S, Song Y. Risk assessment of rare earth elements in fruits and vegetables from mining areas in China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:48694-48703. [PMID: 35195864 DOI: 10.1007/s11356-022-19080-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
Assessment of contaminated food through the dietary intake is essential for human health. To investigate the health risk of rare earth element (REE) exposure to fruits and vegetables in mining areas in China, we collected 288 fruit samples and 942 vegetable samples from four representative mining points (Bayan Obo in Inner Mongolia, Weishan in Shandong, Maoming in Guangdong, Longnan in Jiangxi) and their control areas. The content of REEs was determined by inductively coupled plasma-mass spectrometry (ICP-MS). The total REEs in fruits from mining and control areas were 12.90 μg kg-1 and 11.89 μg kg-1, and in vegetables were 92.90 μg kg-1 and 62.38 μg kg-1, and the difference was statistically significant in vegetables (P = 0.048). The drupes had more REE concentration in fruits (68.41 μg kg-1, 16.90 μg kg-1 in mining and control areas, respectively) (P < 0.01), and the leafy vegetables had more REE concentration in vegetables (245.81 μg kg-1, 123.51 μg kg-1 in mining and control areas, respectively) (P < 0.01). With the enrichment of light rare earth elements (LREE), the REE distribution patterns coincided in mining and control areas and different types of fruits and vegetables. The health risk assessment indicated that the estimated daily intakes (0.02-0.06 μg kg-1 day-1, 0.53-1.22 μg kg-1 day-1 for fruits and vegetables, respectively) were lower than the allowable daily intake value (60.4 μg kg-1 day-1). In mining areas, REEs obtained from fruits and vegetables were insufficient to cause health damage to human beings. However, sustained exposure to low REEs, especially for children, still needs attention.
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Affiliation(s)
- Ziwei Shi
- MOE Key Lab of Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, People's Republic of China
| | - Ling Yong
- Key Laboratory of Food Safety Risk Assessment, National Health and Family Planning Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 10022, People's Republic of China
| | - Zhaoping Liu
- Key Laboratory of Food Safety Risk Assessment, National Health and Family Planning Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 10022, People's Republic of China
| | - Yibaina Wang
- Key Laboratory of Food Safety Risk Assessment, National Health and Family Planning Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 10022, People's Republic of China
| | - Haixia Sui
- Key Laboratory of Food Safety Risk Assessment, National Health and Family Planning Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 10022, People's Republic of China
| | - Weifeng Mao
- Key Laboratory of Food Safety Risk Assessment, National Health and Family Planning Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 10022, People's Republic of China
| | - Lei Zhang
- Key Laboratory of Food Safety Risk Assessment, National Health and Family Planning Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 10022, People's Republic of China
| | - Yiling Li
- MOE Key Lab of Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, People's Republic of China
| | - Jialin Liu
- MOE Key Lab of Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, People's Republic of China
| | - Sheng Wei
- MOE Key Lab of Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, People's Republic of China
| | - Yan Song
- Key Laboratory of Food Safety Risk Assessment, National Health and Family Planning Commission of the People's Republic of China (China National Center for Food Safety Risk Assessment), Beijing, 10022, People's Republic of China.
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Stetson C, Prodius D, Lee H, Orme C, White B, Rollins H, Ginosar D, Nlebedim IC, Wilson AD. Solvent-driven fractional crystallization for atom-efficient separation of metal salts from permanent magnet leachates. Nat Commun 2022; 13:3789. [PMID: 35778388 PMCID: PMC9249736 DOI: 10.1038/s41467-022-31499-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 06/18/2022] [Indexed: 11/20/2022] Open
Abstract
This work reports a dimethyl ether-driven fractional crystallization process for separating rare earth elements and transition metals. The process has been successfully applied in the treatment of rare earth element-bearing permanent magnet leachates as an atom-efficient, reagent-free separation method. Using ~5 bar pressure, the solvent was dissolved into the aqueous system to displace the contained metal salts as solid precipitates. Treatments at distinct temperatures ranging from 20-31 °C enable crystallization of either lanthanide-rich or transition metal-rich products, with single-stage solute recovery of up to 95.9% and a separation factor as high as 704. Separation factors increase with solution purity, suggesting feasibility for eco-friendly solution treatments in series and parallel to purify aqueous material streams. Staged treatments are demonstrated as capable of further improving the separation factor and purity of crystallized products. Upon completion of a crystallization, the solvent can be recovered with high efficiency at ambient pressure. This separation process involves low energy and reagent requirements and does not contribute to waste generation.
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Affiliation(s)
- Caleb Stetson
- Critical Materials Institute, Idaho National Laboratory, 1955 N Fremont Ave, Idaho Falls, ID, 83415, USA
| | - Denis Prodius
- Critical Materials Institute, Ames Laboratory, US Department of Energy, Ames, IA, 50011-3020, USA
| | - Hyeonseok Lee
- Critical Materials Institute, Idaho National Laboratory, 1955 N Fremont Ave, Idaho Falls, ID, 83415, USA
| | - Christopher Orme
- Critical Materials Institute, Idaho National Laboratory, 1955 N Fremont Ave, Idaho Falls, ID, 83415, USA
| | - Byron White
- Critical Materials Institute, Idaho National Laboratory, 1955 N Fremont Ave, Idaho Falls, ID, 83415, USA
| | - Harry Rollins
- Critical Materials Institute, Idaho National Laboratory, 1955 N Fremont Ave, Idaho Falls, ID, 83415, USA
| | - Daniel Ginosar
- Critical Materials Institute, Idaho National Laboratory, 1955 N Fremont Ave, Idaho Falls, ID, 83415, USA
| | - Ikenna C Nlebedim
- Critical Materials Institute, Ames Laboratory, US Department of Energy, Ames, IA, 50011-3020, USA
| | - Aaron D Wilson
- Critical Materials Institute, Idaho National Laboratory, 1955 N Fremont Ave, Idaho Falls, ID, 83415, USA.
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Hu J, Yang X, Deng X, Liu X, Yu J, Chi R, Xiao C. Isolation and Nitrogen Removal Efficiency of the Heterotrophic Nitrifying-Aerobic Denitrifying Strain K17 From a Rare Earth Element Leaching Site. Front Microbiol 2022; 13:905409. [PMID: 35756011 PMCID: PMC9216216 DOI: 10.3389/fmicb.2022.905409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 05/09/2022] [Indexed: 11/20/2022] Open
Abstract
K17, an indigenous and heterotrophic nitrifying-aerobic denitrifying bacterium, was isolated from the soil of a weathered crust elution-deposited rare earth ore leaching site in Longnan County, China. Strain K17 was identified as Pseudomonas mosselii. In this study, the morphological characteristics of strain K17 were observed and the optimal ammonia nitrogen removal conditions for the strain were studied using a single-factor experiment. Key enzyme activities were determined, and we also explored the ammonia nitrogen removal process of strain K17 on simulated leaching liquor of the rare earth element leaching site. Based on the determination of ammonia nitrogen removal and enzyme activity, it was found that strain K17 has both heterotrophic nitrifying and aerobic denitrifying activities. In addition, single-factor experiments revealed that the most appropriate carbon source for strain K17 was sodium citrate with a C/N ratio of 10 and an initial NH4+-N concentration of 100 mg/l. Furthermore, the optimal initial pH and rotation speed were 7 and 165 r/min, respectively. Under optimal conditions, the ammonia nitrogen removal efficiency of strain K17 was greater than 95%. As an indigenous bacterium, strain K17 has great potential for treating residual ammonium leaching solutions from rare earth element leaching sites.
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Affiliation(s)
- Jingang Hu
- Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory for Green Chemical Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, China
| | - Xinyu Yang
- Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory for Green Chemical Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, China
| | - Xiangyi Deng
- Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory for Green Chemical Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, China
| | - Xuemei Liu
- Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory for Green Chemical Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, China
| | - Junxia Yu
- Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory for Green Chemical Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, China
| | - Ruan Chi
- Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory for Green Chemical Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, China
| | - Chunqiao Xiao
- Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Key Laboratory for Green Chemical Process of Ministry of Education, School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan, China
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55
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Xiao S, Geng Y, Pan H, Gao Z, Yao T. Uncovering the Key Features of Dysprosium Flows and Stocks in China. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:8682-8690. [PMID: 35544346 DOI: 10.1021/acs.est.1c07724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Dysprosium (Dy) is a critical rare earth element and plays an indispensable role in clean energy technologies, such as wind turbines and electric vehicles. However, its flows and stocks in the whole life cycle and potential barriers to sustainable supply remain unclear, although the demand for Dy is increasing and its reserves are limited. This study aims to track China's Dy cycle for the period of 2000 to 2019 by employing dynamic material flow analysis. The results show that (1) demand for Dy had increased by 117-fold, with an accumulative use of 37,317 tons, of which 50% was obtained from illegal mining; (2) 33% of the overall Dy resource was used in wind turbines in 2019, followed by air conditioners and electric vehicles (22 and 17%, respectively); (3) China's net Dy export had increased by 10-fold from 2000 to 2019, with Dy concentrates and final products being the dominant import and export products, respectively. Illegal mining, inadequate recycling policies, and limited Dy supply sources are potential barriers influencing sustainable Dy supply.
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Affiliation(s)
- Shijiang Xiao
- School of International and Public Affairs, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Yong Geng
- School of International and Public Affairs, Shanghai Jiao Tong University, Shanghai 200030, China
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Hengyu Pan
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu Campus, Chengdu, Sichuan 611130, PR China
| | - Ziyan Gao
- School of International and Public Affairs, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Tianli Yao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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56
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Saito T. Production of (Sm,Zr)(Fe,Co)3 magnets. Heliyon 2022; 8:e09612. [PMID: 35711986 PMCID: PMC9192805 DOI: 10.1016/j.heliyon.2022.e09612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/27/2022] [Accepted: 05/27/2022] [Indexed: 12/01/2022] Open
Abstract
This study was aimed at the improvement of SmFe3-based alloys prepared by means of melt-spinning. A systematic study was carried out on (Sm1-xZrx)(Fe0.75Co0.25)3 (x = 0–0.4) alloys melt-spun at a wheel speed of 50 m/s and annealed at 773–1173 K. SmFe3-based melt-spun ribbons with a rhombohedral structure were prepared from the (Sm1-xZrx) (Fe0.75Co0.25)3 (x = 0–0.4) alloys. The addition of zirconium increased the coercivity and enhanced the remanence of the melt-spun ribbons. However, the Curie temperature slightly decreased with increasing zirconium content. The optimally annealed alloys, with a composition of (Sm0.7Zr0.3) (Fe0.75Co0.25)3, achieved a coercivity of 7.8 kOe, a remanence of 6.0 kG, and a Curie temperature of 680K.
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57
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Study on Economic Significance of Rare Earth Mineral Resources Development Based on Goal Programming and Few-Shot Learning. COMPUTATIONAL INTELLIGENCE AND NEUROSCIENCE 2022; 2022:7002249. [PMID: 35586093 PMCID: PMC9110130 DOI: 10.1155/2022/7002249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/04/2022] [Accepted: 04/05/2022] [Indexed: 11/17/2022]
Abstract
Rare earth is one of the most important strategic minerals in the world today. The wide application of new products and technologies in the global market has made the world's demand for rare earth resources grow rapidly. As an important basic resource of high technology, rare earth plays a significant role in national security and strategy. As rare earth mineral resources are irreplaceable in civil, military, and nuclear industries, they have become national strategic resources of various countries in the world. Although China's rare earth industry has occupied a leading position in the world, with the continuous expansion of the scale of the rare earth industry, the pollution problem of “three wastes” produced in the recovery of rare earth mineral resources is becoming more and more serious. From the perspective of resource endowment, China is rich in rare earth resources, but the declining trend of resource reserves is obvious, and the advantages and disadvantages of resources are more prominent. Based on the goal planning and few-shot learning, this paper studies the economic significance of rare earth resource development, aiming at solving some problems in the development of rare earth mineral resources in China, and thus promoting the scientific and healthy development of the rare earth industry.
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58
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Stoy L, Kulkarni Y, Huang CH. Optimization of Iron Removal in the Recovery of Rare-Earth Elements from Coal Fly Ash Using a Recyclable Ionic Liquid. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:5150-5160. [PMID: 35380811 DOI: 10.1021/acs.est.1c08552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Rare-earth elements (REEs) are essential for modern technologies, and the United States currently lacks a secure domestic supply. Coal combustion residuals, specifically coal fly ash (CFA), can be a potential source. Our previous work demonstrated that REEs could be preferentially extracted from CFA using the ionic liquid (IL) betainium bis(trifluoromethylsulfonyl)imide ([Hbet][Tf2N]), and the process yielded a mildly acidic REE-rich solution with coextracted Fe and regenerated IL. In this study, we investigated three strategies to limit Fe coextraction: magnetic separation, complexing salts, and ascorbic acid (AA) reduction. Magnetic separation of CFA was ineffective in significantly lowering the Fe content in the IL phase. When NaCl was used instead of NaNO3 during extraction, chloride complexation lowered iron distribution to the IL phase over the aqueous phase (DFe) by five folds, from ∼75 to ∼14, while REE leaching (LREEs) and recovery (RREEs) both increased. Using AA for iron reduction lowered the overall amount of Fe extracted and further decreased DFe to ∼0.16, effectively shifting Fe preference from the IL phase to the aqueous phase. Combining the strategies of NaCl, AA, and supplemental betaine addition, leaching and extraction of REEs from CFA by [Hbet][Tf2N] were achieved in higher efficiency for REE recovery with minimized Fe concentration.
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Affiliation(s)
- Laura Stoy
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Yamini Kulkarni
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Ching-Hua Huang
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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Wang Z, Zhang GY, Pei HX, Sun ZB, Cheng JL, Zhou T, Geng CX, Lei KN, Zheng CL. Selection of optimal models for predicting growth stress in Artemisia desertorum by comparison of linear regression and multiple neural networks: Take the construction of a green mine in the Bayan Obo mine as an example. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 235:113400. [PMID: 35325607 DOI: 10.1016/j.ecoenv.2022.113400] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 02/13/2022] [Accepted: 03/06/2022] [Indexed: 06/14/2023]
Abstract
In recent years, more and more countries are focusing on the control of mining sites and the surrounding ecological environment, and the new environmental concept of green mines has been proposed. By investigating the ecological background of a mine site, pollution and ecological imbalances in the mine can be predicted, managed or transformed. This study investigated the effects of rare earth elements on plant growth in the Baotou Bayan Obo Rare Earth Mine and evaluated soil contamination and subsequent remediation through the measured plant height. Using linear regression, BP(Back Propagation) neural networks, GA-BP(Genetic Algorithm- Back Propagation) neural networks, ELM(Extreme Learning Machine) and GA-ELM(Genetic Algorithm- Extreme Learning Machine) model prediction instruments, the different rare earth solution concentrations were set as input values and the heights of Artemisia desertorum, which as the model plant, were set as output values in the prediction. The results showed that the linear regression predicted the standard error of single La(III), Ce(III) solution and compound La(III) + Ce(III) solution for Artemisia desertorum growth stress was on the high side, 7.02%- 8.92%; the efficiency range of each group of models under BP neural network, GA-BP neural network and ELM neural network were 1.15%- 2.53%, 0.85%- 1.28%, 1.76%- 3.53%; while the efficiency range under GA-ELM neural network was 0.59%- 0.68%, with average error values and predicted values close to the true values. Among them, the MAPE of GA-ELM neural network are significantly lower than other models, and the error decreases with increasing concentration of the compound solution. So GA-ELM neural network can be used as an efficient, fast and reasonable optimal model for predicting the growth stress of Artemisia desertorum in Bayan Obo mining area. The experimental results can provide a theoretical basis for assessing the risk of soil rare earth contamination in the area, evaluating the expectation of later remediation, and provide a degree of new ideas for the construction of green mines.
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Affiliation(s)
- Zhe Wang
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China; Engineering Research Center of Evaluation and Restoration in the Mining Ecological Environments, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
| | - Guang-Yu Zhang
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
| | - Hai-Xia Pei
- School of Life Science and Technology, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
| | - Zhen-Bo Sun
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
| | - Jun-Li Cheng
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
| | - Tong Zhou
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
| | - Cheng-Xin Geng
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
| | - Kai-Neng Lei
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China
| | - Chun-Li Zheng
- School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China; Engineering Research Center of Evaluation and Restoration in the Mining Ecological Environments, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China; Collaborative Innovation Center of Inner Mongolia Autonomous Region Carbon Neutral, Inner Mongolia University of Science and Technology, Baotou 014010, China; Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China.
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60
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Yu G, Zeng Z, Gao Y, Ni S, Zhang H, Sun X. Separation of aluminum from rare earth by solvent extraction with 4-octyloxybenzoic acid. J RARE EARTH 2022. [DOI: 10.1016/j.jre.2022.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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61
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Removal of yttrium from rare-earth wastewater by Serratia marcescens: biosorption optimization and mechanisms studies. Sci Rep 2022; 12:4861. [PMID: 35318347 PMCID: PMC8941142 DOI: 10.1038/s41598-022-08542-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 03/02/2022] [Indexed: 01/11/2023] Open
Abstract
The discharge of yttrium containing wastewater is a potential risk to human health. Although biosorption is a promising method to remove yttrium from wastewater, whereas the application of it is limited due to the lack of efficient biosorbents. In this study, the removal of yttrium from wastewater using Serratia marcescens as a biosorbent was conducted. The effects of six parameters including pH (2–5.5), initial yttrium concentration (10–110 mg/L), biosorbent dosage (0.1–0.5 g/L), biosorption time (10–700 min), stirring speed (50–300 rpm) and temperature (20–60 °C) were evaluated. The main parameters were optimized using response surface methodology. The results showed that the adsorption capacity reached 123.65 mg/g at the optimized conditions. The biosorption mechanism was revealed based on a combined analysis using field emission transmission electron microscope-energy dispersion spectrum, Fourier transform infrared spectrophotometer, and X-ray photoelectron spectroscopy. These results revealed that the hydroxyl, carboxyl, and amino groups were the adsorption functional groups for yttrium ions. Biosorption of yttrium by S. marcescens is under the combination of ion exchange, electrostatic attraction and complexation. These findings indicated that S. marcescens can be used as an efficient biosorbent to remove yttrium from wastewater. In addition, its adsorption capacity can be further improved by the enhancement of adsorption functional groups on the surface through chemical modification.
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62
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Interaction mechanism of 2-hydroxy-3-naphthyl hydroxamic acid and 1-hydroxy-2-naphthyl hydroxamic acid in the flotation separation of bastnaesite/fluorite: Experiments and first-principles calculations. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120307] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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63
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The Recycling of Coal Fly Ash: A Review on Sustainable Developments and Economic Considerations. SUSTAINABILITY 2022. [DOI: 10.3390/su14041958] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The recycling and utilization opportunities for coal fly ash (CFA) have increased in the past two decades. However, limited commercialization of the material is still reported, while disposal and management remain major concerns. CFA utilization is currently commercially feasible in the building and construction industry. Other alternative uses that are being explored involve the extraction of valuable metals and the purification of wastewater. The CFA-produced adsorbent material utilized in wastewater purification processes should be able to generate water that meets the legal quality requirements for reutilization in alternative applications. On the other hand, in the recovery of metallic components such as smelter-grade alumina, high recovery and high purity products are only achievable through the processing of CFA using expensive and energy—intensive processes. Furthermore, most of the current CFA recycling processes tend to generate secondary solid residues (SSR), which can cause environmental pollution, thus requiring further downstream processing. In this context, this paper reviews and discusses current research on CFA recycling methods, challenges and opportunities associated with resource recovery from CFA, and the acceptability of the value-added products, and it therefore proposes sustainable processes for CFA utilization. This review further suggests that to successfully compete with bauxite for production of smelter-grade alumina, other saleable value-added products such as Ti, Fe and the REEs should be recovered by engineering an integrated process design. The generated SSR in each process must also be characterized, recycled and re-used to reduce waste production and advance the circular economy concept. The review concludes that for CFA to become considered as a more attractive commercial resource, there is need for its complete and holistic utilization in high volumes and in different applications to offset its low value.
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64
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Geng Y, Cui D, Yang L, Xiong Z, Pavlostathis SG, Shao P, Zhang Y, Luo X, Luo S. Resourceful treatment of harsh high-nitrogen rare earth element tailings (REEs) wastewater by carbonate activated Chlorococcum sp. microalgae. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:127000. [PMID: 34461547 DOI: 10.1016/j.jhazmat.2021.127000] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 08/01/2021] [Accepted: 08/19/2021] [Indexed: 06/13/2023]
Abstract
The discharge of rare earth element (REE) tailings wastewater results in serious ecological deterioration and health risk, due to high ammonia nitrogen, and strong acidity. The low C/N ratio makes it recalcitrant to biodegradation. Recently it has been shown that microalgal technology has a promising potential for the simultaneous harsh wastewater treatment and resource recovery. However, the low nitrogen removal rate and less biomass of microalgae restricted its development. In this work, Chlorococcum sp. was successfully isolated from the rare earth mine effluent. The microalgae was capable of enhancing nitrogen contaminants removal from REEs wastewater due to the carbonate addition, which simulated the activity increase of carbonic anhydrase (CA). The total inorganic nitrogen (TIN) removal rate reached 4.45 mg/L h-1, which compared to other microalgal species, the nitrogen removal rate and biomass yield were 7.8- and 4.9-fold higher, respectively. Notably, high lipid contents (mainly triglycerides, 43.85% of dry weight) and a high biomass yield were obtained. Meanwhile, the microalgae had an excellent settleability attributed to higher extracellular polymeric substance (EPS) formation, leading to easier resource harvest. These results were further confirmed in a continuous-flow photobioreactor with a stable operation for more than 30 days, indicating its potential for application.
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Affiliation(s)
- Yanni Geng
- National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Dan Cui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, PR China
| | - Liming Yang
- National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
| | - Zhensheng Xiong
- National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Spyros G Pavlostathis
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0512, USA
| | - Penghui Shao
- National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Yakun Zhang
- National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Xubiao Luo
- National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
| | - Shenglian Luo
- National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang 330063, PR China; Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
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Pereira Neves H, Max Dias Ferreira G, Max Dias Ferreira G, Rodrigues de Lemos L, Dias Rodrigues G, Albis Leão V, Barbosa Mageste A. Liquid-liquid extraction of rare earth elements using systems that are more environmentally friendly: Advances, challenges and perspectives. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120064] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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66
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Amphlett JM, Lee Y, Yang W, Kang D, Sung NE, Park J, Jung EC, Choi S. Spectroscopic Study into Lanthanide Speciation in Deep Eutectic Solvents. ACS OMEGA 2022; 7:921-932. [PMID: 35036756 PMCID: PMC8756809 DOI: 10.1021/acsomega.1c05386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
Deep eutectic solvents are a new class of green solvents that are being explored as an alternative for used nuclear fuel and critical material recycling. However, there is a paucity of knowledge regarding metal behavior in them. This paper explores the underlying chemistry of rare-earth elements in choline chloride-based deep eutectic solvents by using a multi-technique spectroscopic methodology. Results show that speciation is highly dependent on the choice of the hydrogen-bond donor. Collected EXAFS data showed Ln3+ coordination with ethylene glycol and urea in their respective solvents and coordination with chloride in the lactic acid system. Generalized coordination environments were determined to be [LnL4-5], [LnL7-10], and [LnL5-6] in the ethylene glycol, urea, and lactic acid systems, respectively. Collected UV/vis spectra for Nd3+ and Er3+ showed variations with changing solvents, showing that Ln-Cl interactions do not dominate in these systems. Luminescence studies were consistent, showing varying emission spectra with varying solvent systems. The shortest luminescent lifetimes were observed in the choline chloride-ethylene glycol deep eutectic solvent, suggesting coordination through O-H groups. Combining all collected data allowed Eu3+ coordination geometries to be assigned.
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Affiliation(s)
- James
T. M. Amphlett
- Nuclear
and Quantum Engineering Department, Korea
Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Yunu Lee
- Nuclear
and Quantum Engineering Department, Korea
Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Wonseok Yang
- Nuclear
and Quantum Engineering Department, Korea
Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Dokyu Kang
- Nuclear
and Quantum Engineering Department, Korea
Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Nark-Eon Sung
- Pohang
Accelerator Laboratory, POSTECH, Pohang 37673, Republic of Korea
| | - Jaeyeong Park
- School
of Mechanical, Aerospace and Nuclear Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil, Ulju-gun, Ulsan 44919, Republic
of Korea
| | - Euo Chang Jung
- Nuclear
Chemistry Research Team, Korea Atomic Energy
Research Institute, 111 Daedeok-daero 989 beon-gil, Yuseong-gu, Daejeon 34057, Republic
of Korea
| | - Sungyeol Choi
- Department
of Nuclear Engineering, Seoul National University, Seoul 08826, Republic of Korea
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67
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Liu C, Han G, Hu B, Geng F, Liu M, Dai S, Yang Y. Fast Screening of Coal Fly Ash with Potential for Rare Earth Element Recovery by Electron Paramagnetic Resonance Spectroscopy. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:16716-16722. [PMID: 34890179 DOI: 10.1021/acs.est.1c06658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Rare earth elements (REYs) are in increasing global demand, but their mining is costly and environmentally destructive. Coal fly ash (CFA) is a promising alternative source of REYs, but it is necessary to identify CFA with sufficiently high REY concentrations. This study proposes the use of electron paramagnetic resonance (EPR) spectroscopy as part of a simple method to identify CFAs with adequate REY concentrations. The EPR spectra of CFA samples taken from 186 Chinese commercial coal-fired power plants were analyzed. The results suggest that CFAs without evident 6-fold resonances are worth recycling (REY concentrations of 416 ± 108 mg/kg), while those with conspicuous 6-fold resonances are not worth recycling (REY concentrations of 55 ± 26 mg/kg). This is probably due to isomorphic substitution of Ca(II) for Mn(II) and REY(III), resulting in low concentrations of Mn(II) and REY(III) in Ca-rich CFAs. This EPR evaluation method does not require specialized sample preparation, professional skills, or secondary data analysis and has potential global significance in the fast screening of CFAs with REY-recycling potential.
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Affiliation(s)
- Chang Liu
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, Shanghai 200241, China
| | - Guoling Han
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, Shanghai 200241, China
| | - Bingwen Hu
- State Key Laboratory of Precision Spectroscopy, Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China
| | - Fushan Geng
- State Key Laboratory of Precision Spectroscopy, Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China
| | - Min Liu
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, Shanghai 200241, China
| | - Shifeng Dai
- State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China
| | - Yi Yang
- Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographical Sciences, East China Normal University, Shanghai 200241, China
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Kropachev AN, Podrezov SV, Aleksakhin AV, Gudilin AA, Kondratyeva OA, Korshunova LN. Thermodynamic Studies and Optimization of the Method for Obtaining Neodymium Fluoride for the Production of Magnetic Sensors' Sensitive Elements. SENSORS 2021; 21:s21248361. [PMID: 34960459 PMCID: PMC8703594 DOI: 10.3390/s21248361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/09/2021] [Accepted: 12/09/2021] [Indexed: 11/16/2022]
Abstract
Rare earth metals (REM) with magnetic properties find application in the recently developed high-tech industries. Sensor magnetic systems based on neodymium are increasingly in demand in modern engineering and geological surveys due to their favorable combination of properties of magnetic materials based on rare earth metals. One of the problems is to obtain high-quality materials for the production of such magnetic sensors. It should be noted that the high activity of REM does not allow obtaining master alloys and REM-based alloys from metallic materials; it is advisable to use halide compounds. This work discusses a method for producing neodymium fluoride from its oxide. REM fluorides can be obtained by fluorinating the oxides of these metals. Various fluorine-containing compounds or elemental fluorine are usually used as fluorinating reagents, which have their own advantages and disadvantages. The thermodynamic and technological analysis of neodymium fluoride production processes has shown the most acceptable fluorinating agent is ammonium hydrofluoride, which was used in this work. In order to increase the productivity and degree of chemical transformation, it was proposed to perform heating stepwise; i.e., at the initial stage, heat at a speed of 3 degrees per minute, after which the heating speed was reduced to 2 degrees per minute, and finally the speed was reduced to 1 degree per minute. Due to proposed heating mode, the same productivity and yield of chemical transformation were achieved, with an increased efficiency up to 30%, which can significantly reduce the cost of production. The obtained product is used in the production of neodymium-based alloys by metallothermic reduction of a mixture of fluorides. The sensor material obtained in this way is characterized by a low (less than 0.05%) oxygen content.
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Affiliation(s)
- Andrei N. Kropachev
- Department of Non-ferrous Metals and Gold, College of Ecotechnologies and Engineering, National University of Science and Technology “MISiS”, 119991 Moscow, Russia
- Correspondence: (A.N.K.); (S.V.P.)
| | - Sergey V. Podrezov
- Department of Non-ferrous Metals and Gold, College of Ecotechnologies and Engineering, National University of Science and Technology “MISiS”, 119991 Moscow, Russia
- Correspondence: (A.N.K.); (S.V.P.)
| | - Alexander V. Aleksakhin
- Department of Mining Equipment, Transport and Mechanical Engineering, College of Mining, National University of Science and Technology “MISiS”, 119991 Moscow, Russia; (A.V.A.); (A.A.G.); (O.A.K.); (L.N.K.)
| | - Andrey A. Gudilin
- Department of Mining Equipment, Transport and Mechanical Engineering, College of Mining, National University of Science and Technology “MISiS”, 119991 Moscow, Russia; (A.V.A.); (A.A.G.); (O.A.K.); (L.N.K.)
| | - Olga A. Kondratyeva
- Department of Mining Equipment, Transport and Mechanical Engineering, College of Mining, National University of Science and Technology “MISiS”, 119991 Moscow, Russia; (A.V.A.); (A.A.G.); (O.A.K.); (L.N.K.)
| | - Lyudmila N. Korshunova
- Department of Mining Equipment, Transport and Mechanical Engineering, College of Mining, National University of Science and Technology “MISiS”, 119991 Moscow, Russia; (A.V.A.); (A.A.G.); (O.A.K.); (L.N.K.)
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69
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Chang S, Zhang J, Liu Z, Gao K, Zhang D, Huang J. Activation mechanisms of apatite by purifying reagent polyacrylamide for backwater from mineral processing in flotation of rare earths. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.09.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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70
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Luo Y, Yuan H, Zhao J, Qi Y, Cao WW, Liu JM, Guo W, Bao ZH. Multiple factors influence bacterial community diversity and composition in soils with rare earth element and heavy metal co-contamination. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 225:112749. [PMID: 34488142 DOI: 10.1016/j.ecoenv.2021.112749] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 08/09/2021] [Accepted: 08/31/2021] [Indexed: 06/13/2023]
Abstract
The effects of long-term rare earth element (REE) and heavy metal (HM) contamination on soil bacterial communities remains poorly understood. In this study, soil samples co-contaminated with REEs and HMs were collected from a rare-earth tailing dam. The bacterial community composition and diversity were analyzed through Illumina high-throughput sequencing with 16S rRNA gene amplicons. Bacterial community richness and diversity were lower in the co-contaminated soils than in the uncontaminated soils, with clearly different bacterial community compositions. The results showed that total organic carbon and available potassium were the most important factors affecting bacterial community richness and diversity, followed by the REE and HM contents. Although the canonical correspondence analysis results showed that an REE alone had no obvious effects on bacterial community structures, we found that the combined effects of soil physicochemical properties and REE and HM contents regulated bacterial community structure and composition. The effects of REEs and HMs on bacterial communities were similar, whereas their combined contributions were greater than the individual effects of REEs or HMs. Some bacterial taxa were worth noting. These specifically included the plant growth-promoting bacteria Exiguobacterium (sensitive to REEs and HMs) and oligotrophic microorganisms with metal tolerance (prevalent in contaminated soil); moreover, relative abundance of JTB255-Marine Benthic Group, Rhodobacteraceae, Erythrobacter, and Truepera may be correlated with REEs. This study was the first to investigate the responses of bacterial communities to REE and HM co-contamination. The current results have major implications for the ecological risk assessment of environments co-contaminated with REEs and HMs.
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Affiliation(s)
- Ying Luo
- School of Life Sciences, Inner Mongolia University, Hohhot 010070, China; College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
| | - Hao Yuan
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Inner Mongolia Energy Investment Group CO., LID. Electric Power Engineering Technology Research Institute, Hohhot 010060, China
| | - Ji Zhao
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Inner Mongolia Key Laboratory of Environmental Pollution Control & Waste Resource Reuse, Inner Mongolia University, Hohhot 010021, China
| | - Yu Qi
- Inner Mongolia Academy of Environmental Science, Hohhot 010011, China
| | - Wei-Wei Cao
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
| | - Ju-Mei Liu
- School of Life Sciences, Inner Mongolia University, Hohhot 010070, China
| | - Wei Guo
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Inner Mongolia Key Laboratory of Environmental Pollution Control & Waste Resource Reuse, Inner Mongolia University, Hohhot 010021, China
| | - Zhi-Hua Bao
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Inner Mongolia Key Laboratory of Environmental Pollution Control & Waste Resource Reuse, Inner Mongolia University, Hohhot 010021, China.
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71
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Zhi H, Feng L, Ni S, Cui J, Sun X. The transformation and enrichment of rare earth sulfate in Bayan Obo ore water leaching solution by dibenzyl phosphate based extraction-precipitation method. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119464] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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72
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Botelho Junior AB, Espinosa DCR, Tenório JAS. Selective separation of Sc(III) and Zr(IV) from the leaching of bauxite residue using trialkylphosphine acids, tertiary amine, tri-butyl phosphate and their mixtures. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119798] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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73
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Yang K, Zhao X, Wei Z, Zhang J. Development overview of paste backfill technology in China's coal mines: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:67957-67969. [PMID: 34637124 DOI: 10.1007/s11356-021-16940-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 10/04/2021] [Indexed: 06/13/2023]
Abstract
After years of development, paste backfill technology has become an important part of China's green safety mine construction and coal green mining technology system in the new era. In this paper, the research status of paste backfill technology in China's coal mines is expounded from the aspects of paste backfill materials, strata control theory, and paste backfill technological process. Based on the statistics of the distribution number of coal mines adopting paste backfill technology, several typical paste backfill mines are listed, and the parameters of backfill panel, geological conditions, and paste backfill effect are analyzed, the general conditions of applying paste backfill technology in coal mines are summarized. Finally, some problems in the application of paste backfill technology are pointed out, and the future development of backfill mining is prospected from the research and development of backfill materials, deep underground backfill mining, intelligent paste backfill, and other aspects. This paper provides a reference for a comprehensive and in-depth understanding of the current development status of paste backfill technology in China.
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Affiliation(s)
- Ke Yang
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan, 232001, China
- Energy Research Institute of Hefei Comprehensive National Science Center (Anhui Energy Laboratory), Hefei Anhui, 230000, China
- Key Laboratory of Mining Coal Safety and Efficiently Constructed By Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan, 232001, China
- School of Mining Engineering, Anhui University of Science and Technology, Huainan, 232001, China
| | - Xinyuan Zhao
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan, 232001, China.
- Key Laboratory of Mining Coal Safety and Efficiently Constructed By Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan, 232001, China.
- School of Mining Engineering, Anhui University of Science and Technology, Huainan, 232001, China.
| | - Zhen Wei
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan, 232001, China
- Key Laboratory of Mining Coal Safety and Efficiently Constructed By Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan, 232001, China
- School of Mining Engineering, Anhui University of Science and Technology, Huainan, 232001, China
| | - Jiqiang Zhang
- State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology, Huainan, 232001, China
- Key Laboratory of Mining Coal Safety and Efficiently Constructed By Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan, 232001, China
- School of Mining Engineering, Anhui University of Science and Technology, Huainan, 232001, China
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Yu H, Zhao C, Li S, Wang Z, Zhang Y. Pre-Work for the Birth of Driver-Less Scraper (LHD) in the Underground Mine: The Path Tracking Control Based on an LQR Controller and Algorithms Comparison. SENSORS 2021; 21:s21237839. [PMID: 34883862 PMCID: PMC8659438 DOI: 10.3390/s21237839] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/18/2021] [Accepted: 11/20/2021] [Indexed: 11/18/2022]
Abstract
With the depletion of surface resources, mining will develop toward the deep surface in the future, the objective conditions such as the mining environment will be more complex and dangerous than now, and the requirements for personnel and equipment will be higher and higher. The efficient mining of deep space is inseparable from movable and flexible production and transportation equipment such as scrapers. In the new era, intelligence is leading to the development trend of scraper (LHD), path tracking control is the key to the intelligent scraper (LHD), and it is also an urgent problem to be solved for unmanned driving. This paper describes the realization of the automatic operation of articulating the scraper (LHD) from two aspects, a mathematical model and trajectory tracking control method, and it focuses on the research of the path tracking control scheme in the field of unmanned driving, that is, an LQR controller. On this basis, combined with different intelligent clustering algorithms, the parameters of the LQR controller are optimized to find the optimal solution of the LQR controller. Then, the path tracking control of an intelligent LHD unmanned driving technology is studied, focusing on the optimization of linear quadratic optimal control (LQR) and the intelligent cluster algorithms AGA, QPSO, and ACA; this research has great significance for the development of the intelligent scraper (LHD). As mining engineers, we not only need to conduct research for practical engineering projects but also need to produce theoretical designs for advanced mining technology; therefore, the area of intelligent mining is the one we need to explore at present and in the future. Finally, this paper serves as a guide to starting a conversation, and it has implications for the development and the future of underground transportation.
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Yu JM, Luo D, Ma ZJ, Zheng B, Cheng FF, Xiong WW. Effective Enrichment of Low-Concentration Rare-Earth Ions by Three-Dimensional Thiostannate K 2Sn 2S 5. ACS APPLIED MATERIALS & INTERFACES 2021; 13:55188-55197. [PMID: 34757713 DOI: 10.1021/acsami.1c17465] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Rare-earth elements (REEs) in industrial wastewaters have great value for recycling and reuse, but their characteristic of low concentration poses a challenge to an efficient enrichment from wastewaters. In recent years, thiometallates featuring two-dimensional layers have shown great potential in the enrichment of REEs via the ion-exchange process. However, investigations on thiometallates featuring three-dimensional anionic frameworks for the recovery of REEs have not been reported. Herein, K2Sn2S5 (KTS-2), a thiostannate possessing a three-dimensional porous framework, was chosen as an ion-exchange material for capturing REEs from an aqueous solution. Indeed, KTS-2 exhibited excellent ion-exchange performance for all 16 REEs (except Pm). Specifically, KTS-2 displayed a high capture capacity (232.7 ± 7.8 mg/g) and a short equilibrium time (within 10 min) for Yb3+ ions. In addition, KTS-2 had a high distribution coefficient for Yb3+ ions (Kd > 105 mL/g) in the presence of excessive interfering ions. Impressively, KTS-2 could reach removal rates of above 95% for all 16 REEs in a large quantity of wastewater with low initial concentration (∼7 mg/L). Moreover, KTS-2 could be used as an eco-friendly material for ion exchange of REEs, since the released K+ cations would not cause secondary pollution to the water solution.
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Affiliation(s)
- Ji-Ming Yu
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization and National and Local Collaborative Engineering Center of Chinese Medicinal Resources and Industrialization and Formulae Innovative Medicine, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, P. R. China
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Da Luo
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization and National and Local Collaborative Engineering Center of Chinese Medicinal Resources and Industrialization and Formulae Innovative Medicine, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, P. R. China
| | - Zhong-Jie Ma
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Bing Zheng
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Fang-Fang Cheng
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization and National and Local Collaborative Engineering Center of Chinese Medicinal Resources and Industrialization and Formulae Innovative Medicine, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, P. R. China
| | - Wei-Wei Xiong
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P. R. China
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76
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A comparative investigation into floatability of bastnaesite with three di/trialkyl phosphate surfactants. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2020.09.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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77
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Environmentally sound technology development for processing of rare earth elements from waste permanent magnets synthetic leach solutions: recovery and separation perspectives. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119225] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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78
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Gao X, Yu M, Sun W, Han Y, Yang J, Lu X, Jin C, Wu S, Cai Y. Lanthanum chloride induces autophagy in primary cultured rat cortical neurons through Akt/mTOR and AMPK/mTOR signaling pathways. Food Chem Toxicol 2021; 158:112632. [PMID: 34688703 DOI: 10.1016/j.fct.2021.112632] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 09/30/2021] [Accepted: 10/19/2021] [Indexed: 11/29/2022]
Abstract
Autophagy is a lysosome dependent degradation pathway occurring in eukaryotic cells. Autophagy ensures balance and survival mechanism of cells during harmful stress. Excessive or weak autophagy leads to abnormal function and death in some cases. Lanthanum (La), a rare earth element (REE), damages the central nervous system (CNS) and promotes learning and memory dysfunction. However, underlying mechanism has not been fully elucidated. La induces oxidative stress, inhibits Nrf2/ARE and Akt/mTOR signaling pathways, and activates JNK/c-Jun and JNK/Foxo signaling pathways, resulting in abnormal induction of autophagy in rat hippocampus. In addition, La activates PINK1- Parkin signaling pathway and induces mitochondrial autophagy. However, the relationship between La and autophagy in rat neurons at the cellular level has not been explored previously. The aim of this study was to explore adverse effects of La. Primary culture of rat neurons were exposed to 0 mmol/L, 0.025 mmol/L, 0.05 mmol/L and 0.1 mmol/L lanthanum chloride (LaCl3). The results showed that La upregulates p-AMPK, inhibits levels of p-Akt and p-mTOR, increases levels of autophagy related proteins (Beclin1 and LC3B-II), and downregulates expression of p-Bcl-2 and p62. Upstream and downstream intervention agents of autophagy were used to detect autophagy flux to verify accuracy of our results. Electron microscopy results showed significant increase in the number of autophagosomes in LaCl3 exposed groups. These findings imply that LaCl3 inhibits Akt/mTOR signaling pathway and activates AMPK/mTOR signaling pathway, resulting in abnormal autophagy in primary cultured rat cortical neurons. In addition, LaCl3 induces neuronal damage through excessive autophagy.
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Affiliation(s)
- Xiang Gao
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, No.209 Tongshan Road, Xuzhou, 221000, Jiangsu Province, People's Republic of China; Department of Biostatistics, School of Public Health, Xuzhou Medical University, No.209 Tongshan Road, Xuzhou, 221000, Jiangsu Province, People's Republic of China.
| | - Miao Yu
- Department of Toxicology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China.
| | - Wenchang Sun
- Department of Toxicology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China.
| | - Yarao Han
- Department of Toxicology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China.
| | - Jinghua Yang
- Department of Toxicology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China.
| | - Xiaobo Lu
- Department of Toxicology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China.
| | - Cuihong Jin
- Department of Toxicology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China.
| | - Shengwen Wu
- Department of Toxicology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China.
| | - Yuan Cai
- Department of Toxicology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning Province, People's Republic of China.
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79
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Oliveira JSS, Hacha RR, d’Almeida FS, Almeida CA, Moura FJ, Brocchi EA, Souza RFM. Electronic Waste Low-Temperature Processing: An Alternative Thermochemical Pretreatment to Improve Component Separation. MATERIALS (BASEL, SWITZERLAND) 2021; 14:6228. [PMID: 34683820 PMCID: PMC8540244 DOI: 10.3390/ma14206228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 10/03/2021] [Accepted: 10/11/2021] [Indexed: 11/29/2022]
Abstract
The production of electronic waste due to technological development, economic growth and increasing population has been rising fast, pushing for solutions before the environmental pressure achieves unprecedented levels. Recently, it was observed that many extractive metallurgy alternatives had been considered to recover value from this type of waste. Regarding pyrometallurgy, little is known about the low-temperature processing applied before fragmentation and subsequent component separation. Therefore, the present manuscript studies such alternative based on scanning electron microscopy characterization. The sample used in the study was supplied by a local recycling center in Rio de Janeiro, Brazil. The mass loss was constant at around 30% for temperatures higher than 300 °C. Based on this fact, the waste material was then submitted to low-temperature processing at 350 °C followed by attrition disassembling, size classification, and magnetic concentration steps. In the end, this first report of the project shows that 15% of the sample was recovered with metallic components with high economic value, such as Cu, Ni, and Au, indicating that such methods could be an interesting alternative to be explored in the future for the development of alternative electronic waste extraction routes.
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Affiliation(s)
| | | | | | | | | | | | - Rodrigo F. M. Souza
- Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, RJ, Brazil; (J.S.S.O.); (R.R.H.); (F.S.d.); (C.A.A.); (F.J.M.); (E.A.B.)
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80
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Hei X, Fang Y, Teat SJ, Farrington C, Bonite M, Li J. Copper(I) iodide-based organic–inorganic hybrid compounds as phosphor materials. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2021. [DOI: 10.1515/znb-2021-0126] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Two photoluminescent copper(I) iodide inorganic-organic hybrid materials have been synthesized and structurally characterized as 1D-Cu2I2(bpoe)2 (1) and 1D-Cu2I2(bbtpe-m)2 (2) (bpoe = 1,2-bis(pyridin-3-yloxy)ethane, bbtpe-m = 1,1′-(3-methylpentane-1,5-diyl)bis(1H-benzo[1,2,3]triazole). Both are chain-like structures composed of Cu2I2 rhomboid dimers connected by bidentate ligands. Their emission colors range from cyan to yellow with relatively high internal quantum yields in the solid state. The tunable band gap and emission color is achieved by varying the LUMO energies of the ligands. The structures are robust and remain stable up to T = 260 °C, and coupled with their efficient and adjustable luminescence, facile synthesis, and non-toxic nature, these compounds demonstrate potential as rare earth element (REE)-free phosphors.
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Affiliation(s)
- Xiuze Hei
- Department of Chemistry and Chemical Biology , Rutgers University , Piscataway , NJ 08854 , USA
| | - Yang Fang
- Department of Chemistry and Chemical Biology , Rutgers University , Piscataway , NJ 08854 , USA
| | - Simon J. Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley , CA 94720 , USA
| | - Colin Farrington
- Department of Chemistry and Chemical Biology , Rutgers University , Piscataway , NJ 08854 , USA
| | - Megan Bonite
- Department of Chemistry and Chemical Biology , Rutgers University , Piscataway , NJ 08854 , USA
| | - Jing Li
- Department of Chemistry and Chemical Biology , Rutgers University , Piscataway , NJ 08854 , USA
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81
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Viana T, Henriques B, Ferreira N, Lopes C, Tavares D, Fabre E, Carvalho L, Pinheiro-Torres J, Pereira E. Sustainable recovery of neodymium and dysprosium from waters through seaweeds: Influence of operational parameters. CHEMOSPHERE 2021; 280:130600. [PMID: 33940453 DOI: 10.1016/j.chemosphere.2021.130600] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/31/2021] [Accepted: 04/12/2021] [Indexed: 06/12/2023]
Abstract
The high demand for greener energy and technological innovation require some crucial elements, such as the rare earths Nd and Dy. Being considered two of the most critical elements (high supply risk), it is vital to recover them from wastes/wastewaters, for later reuse. Here, the influence of operational parameters, such as biosorbent stock density (0.5, 3.0, and 5.5 g L-1), ionic strength (salinity 10 and 30) and contact time (24, 72 and 168 h), in the biosorption/bioaccumulation of Nd and Dy by two living marine macroalgae was evaluated in artificial seawater, seeking the improvement of the process. Results demonstrated that stock density is the most influential parameter, while the ionic strength showed to be a selective parameter, with a major influence only for Dy removal, which can be attributed to the different chemical characteristics observed between light rare earth elements (LREE) and heavy rare earth elements (HREE). For the ranges studied, the greatest removal/recovery for Gracilaria sp. was achieved with a stock density of 3.0 g L-1 at salinity 10, after 72 h for both REEs. For Ulva lactuca optimal conditions were: stock density of 5.5 g L-1 at salinity 10 with a contact time of 72 h for both REEs. Between species, U. lactuca showed to be the most promising, with removal efficiencies up to 98% for Nd and 89% for Dy. Findings substantiate the potential of the proposed process for obtaining Nd and Dy from secondary sources, particularly from low-level contaminated waters.
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Affiliation(s)
- Thainara Viana
- Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Bruno Henriques
- Department of Chemistry, University of Aveiro, Aveiro, Portugal; LAQV-REQUIMTE - Associated Laboratory for Green Chemistry, University of Aveiro, Aveiro, Portugal.
| | - Nicole Ferreira
- Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Cláudia Lopes
- CICECO - Aveiro Institute of Materials, University of Aveiro, Aveiro, Portugal
| | - Daniela Tavares
- Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Elaine Fabre
- Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Lina Carvalho
- LCA - Central Laboratory of Analysis, University of Aveiro, Aveiro, Portugal
| | | | - Eduarda Pereira
- Department of Chemistry, University of Aveiro, Aveiro, Portugal; LAQV-REQUIMTE - Associated Laboratory for Green Chemistry, University of Aveiro, Aveiro, Portugal; LCA - Central Laboratory of Analysis, University of Aveiro, Aveiro, Portugal
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82
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Cao W, Huang K, Wang X, Liu H. Extraction kinetics and kinetic separation of La(III), Gd(III), Ho(III) and Lu(III) from chloride medium by HEHEHP. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2020.10.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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83
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Boczonádi I, Jakab Á, Baranyai E, Tóth CN, Daróczi L, Csernoch L, Kis G, Antal M, Pusztahelyi T, Grawunder A, Merten D, Emri T, Fábián I, Kothe E, Pócsi I. Rare earth element sequestration by Aspergillus oryzae biomass. ENVIRONMENTAL TECHNOLOGY 2021; 42:3725-3735. [PMID: 32134365 DOI: 10.1080/09593330.2020.1739146] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 03/02/2020] [Indexed: 06/10/2023]
Abstract
The fungus Aspergillus oryzae could be shown to be a viable alternative for biosorption of valuable metals from solution. Fungal biomass can be obtained easily in high quantities as a waste of biofermentation processes, and used in a complex, multi-phase solution mimicking naturally occurring, mining-affected water samples. With test solution formulated after natural conditions, formation of secondary Al and Fe phases co-precipitating Ce was recorded in addition to specific biosorption of rare earth elements. Remarkably, the latter were removed from the solution despite the presence of high concentrations of interfering Fe and Al. The biomass was viable even after prolonged incubation in the metal solution, and minimal inhibitory concentrations for single metals were higher than those in the test solution. While precipitation/biosorption of Ce (maximal biosorption efficiency was 58.0 ± 22.3% after 6 h of incubation) coincided with the gross removal of Fe from the metal solution, Y (81.5 ± 11.3% efficiency, 24 h incubation) and Nd (87.4 ± 9.1% efficiency, 24 h incubation) were sequestered later, similarly to Ni and Zn. The biphasic binding pattern specific to single metals could be connected to dynamically changing pH and NH4+ concentrations, which were attributed to the physiological changes taking place in starving A. oryzae biomass. The metals were found extracellularly in minerals associated with the cell wall, and intracellularly precipitated in the vacuoles. The latter process was explained with intracellular metal detoxification resulting in metal resistance.
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Affiliation(s)
- Imre Boczonádi
- Department of Molecular Biotechnology and Microbiology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
- Juhász-Nagy Pál Doctoral School, University of Debrecen, Debrecen, Hungary
| | - Ágnes Jakab
- Department of Molecular Biotechnology and Microbiology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - Edina Baranyai
- Department of Inorganic and Analytical Chemistry, Agilent Atomic Spectroscopy Partner Laboratory, University of Debrecen, Debrecen, Hungary
| | - Csilla Noémi Tóth
- Department of Inorganic and Analytical Chemistry, University of Debrecen, Debrecen, Hungary
| | - Lajos Daróczi
- Department of Solid State Physics, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - László Csernoch
- Department of Physiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Gréta Kis
- Department of Anatomy, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Miklós Antal
- Department of Anatomy, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Tünde Pusztahelyi
- Central Laboratory of Agricultural and Food Products, Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, Debrecen, Hungary
| | - Anja Grawunder
- Institute of Geosciences, Faculty of Chemistry and Earth Sciences, Friedrich Schiller University, Jena, Germany
| | - Dirk Merten
- Institute of Geosciences, Faculty of Chemistry and Earth Sciences, Friedrich Schiller University, Jena, Germany
| | - Tamás Emri
- Department of Molecular Biotechnology and Microbiology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
| | - István Fábián
- Department of Inorganic and Analytical Chemistry, University of Debrecen, Debrecen, Hungary
- MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research Group
| | - Erika Kothe
- Institute of Microbiology, Faculty for Bioscience, Friedrich Schiller University, Jena, Germany
| | - István Pócsi
- Department of Molecular Biotechnology and Microbiology, Faculty of Science and Technology, University of Debrecen, Debrecen, Hungary
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84
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Liang Z, Zhang W, Yang Y, Ma J, Li S, Wen Z. Soil characteristics and microbial community response in rare earth mining areas in southern Jiangxi Province, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:56418-56431. [PMID: 34053046 DOI: 10.1007/s11356-021-14337-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/04/2021] [Indexed: 06/12/2023]
Abstract
The microbial community and functional flora in rare earth mining areas are correlated, but the characteristics and metabolic pathways of pollutant in such mining areas are still poorly known. The heavy metals, rare earth elements, and microorganisms present after mining of rare earth mine sites were analyzed. After mining, all sampling sites exhibited low pH and low total organic carbon levels, accompanied by high iron and aluminum concentrations. The development of vegetation is closely related to the development of microorganisms. In the complex environment of rare earth mining areas, Proteobacteria exhibit an absolute competitive advantage. During mine environmental recovery, the relative abundances of Acidobacteria and Chloroflexi will increase markedly, and with further restoration the relative abundance of Firmicutes will gradually decrease. Many genera of bacteria related to the N cycle and heavy metal metabolism were detected in the study area, indicating the important metabolic pathways for ammonia nitrogen and heavy metals in rare earth mining areas. Bacterial genera that promote plant nitrogen fixation also occur in the area, further revealing the nitrogen cycle. This research is important for health assessment and recovery of rare earth mines.
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Affiliation(s)
- Zhentian Liang
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130012, China
| | - Wenjing Zhang
- College of New Energy and Environment, Jilin University, Changchun, 130012, China.
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130012, China.
| | - Yuesuo Yang
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130012, China
| | - Jincai Ma
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130012, China
| | - Shuxin Li
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130012, China
| | - Zong Wen
- College of New Energy and Environment, Jilin University, Changchun, 130012, China
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130012, China
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85
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Salem AR, Fattah NAA. Separation of Economic and Valuable Elements from Egyptian Monazite Using Miscible Alcohols and Ion Exchange Technique. RADIOCHEMISTRY 2021. [DOI: 10.1134/s1066362221040135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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86
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Artese A, Dourdain S, Boubals N, Dumas T, Solari PL, Menut D, Berthon L, Guilbaud P, Pellet-Rostaing S. Evidence of Supramolecular Origin of Selectivity in Solvent Extraction of Bifunctional Amidophosphonate Extractants with Different Configurations. SOLVENT EXTRACTION AND ION EXCHANGE 2021. [DOI: 10.1080/07366299.2021.1961433] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Alexandre Artese
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | | | | | - Thomas Dumas
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | | | - Denis Menut
- Synchrotron SOLEIL, MARS Beamline, Gif Sur Yvette, France
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87
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Thompson M. The environmentally impacts of digital health. Digit Health 2021; 7:20552076211033421. [PMID: 34408902 PMCID: PMC8365173 DOI: 10.1177/20552076211033421] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 06/30/2021] [Indexed: 11/15/2022] Open
Abstract
Digital health interventions are widely celebrated due to their low-cost nature and ability to provide tailored person-centred care in communities worldwide. As coronavirus disease-19 has rapidly accelerated their growth and reach, interest in global ethical questions surrounding digital health is growing. However, the global environmental implications of digital health have been overlooked. This commentary draws attention to the environmental impacts of digital health devices and communication networks, as well as the data produced by digital health activities. Unless serious attention is paid to greening digital health practices, the rise of digital health will significantly contribute to environmental change, and thus create outcomes of ill-health.
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88
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Chen H, Chen H, Chen Z. A review of in situ phytoextraction of rare earth elements from contaminated soils. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2021; 24:557-566. [PMID: 34365851 DOI: 10.1080/15226514.2021.1957770] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Rare earth elements (REE), with their distinct physical and chemical properties, are critical components of green economic development. Intensive exploitation and application of REE are wreaking havoc on the environment. But research on REE is still limited to a small number and in a few countries. With the growing interest of REE in modern technologies and their potential ecological risks, phytoextraction seems promising for both REE pollution reduction and resource circulation. This paper summarizes the recent findings in the literature concerning REE hyperaccumulating plants and relevant accumulation mechanisms. Additional interests should be focused on a broader range of plant species and a global scale to achieve a sustainable REE supply.Novelty statementThis paper summarized the referenced potential rare earth elements (REE) hyperaccumulator plants that accumulated higher than REE 100 µg/g and discussed their accumulation and translocation mechanisms.We addressed the synonyms of Dicranopteris pedata, Dicranopteris dichotoma Bernh., and Dicranopteris linearis.Although Dicranopteris pedata has been extensively studied in the sense of REE hyperaccumulation, active phytoextraction outside of its native range, as well as in accumulation of the precious heavy rare earth elements, may be difficult. Thus, further interests should take these disadvantages into account.
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Affiliation(s)
- Haibin Chen
- School of History and Geography, Minnan Normal University, Zhangzhou, China
- State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou, China
- School of Geographical Sciences, Fujian Normal University, Fuzhou, China
| | - Haimei Chen
- Department of Dendrology and Floriculture, Faculty of Horticultural, Hungarian University of Agriculture and Life Sciences, Budapest, Hungary
| | - Zhibiao Chen
- State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, Fujian Normal University, Fuzhou, China
- School of Geographical Sciences, Fujian Normal University, Fuzhou, China
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89
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Zhou F, Xiao Y, Guo M, Tang Y, Zhang W, Qiu R. Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO 2 Reduction and Fe/Mn Stabilization. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:11328-11337. [PMID: 34310116 DOI: 10.1021/acs.est.1c03106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The increasing demand for rare earth elements (REEs) motivates the development of novel strategies for cost-effective REE recovery from secondary sources, especially rare earth tailings. The biggest challenges in recovering REEs from ion-adsorption rare earth tailings are incomplete extraction of cerium (Ce) and the coleaching of iron (Fe) and manganese (Mn). Here, a synergistic process between reduction and stabilization was proposed by innovatively using elemental sulfur (S) as reductant for converting insoluble CeO2 into soluble Ce2(SO4)3 and transforming Fe and Mn oxides into inert FeFe2O4 and MnFe2O4 spinel minerals. After the calcination at 400 °C, 97.0% of Ce can be dissolved using a diluted sulfuric acid, along with only 3.67% of Fe and 23.3% of Mn leached out. Thermodynamic analysis reveals that CeO2 was indirectly reduced by the intermediates MnSO4 and FeS in the system. Density functional theory calculations indicated that Fe(II) and Mn(II) shared similar outer electron arrangements and coordination environments, favoring Mn(II) over Ce(III) as a replacement for Fe(II) in the FeO6 octahedral structure of FeFe2O4. Further investigation on the leaching process suggested that 0.5 mol L-1 H2SO4 is sufficient for the recovery of REEs (97.0%). This research provides a promising strategy to selectively recover REEs from mining tailings or secondary sources via controlling the mineral phase transformation.
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Affiliation(s)
- Fengping Zhou
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Ye Xiao
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Meina Guo
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Yetao Tang
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Weihua Zhang
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Rongliang Qiu
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Sun Yat-sen University, Guangzhou, Guangdong 510006, P.R. China
- Guangdong Laboratory for Lingnan Modern Agriculture, South China Agriculture University, Guangzhou, Guangdong 510642, P.R. China
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90
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Abstract
Rare earth elements (REEs) are becoming more and more significant as they play crucial roles in many advanced technologies. Therefore, the development of optimized processes for their recovery, whether from primary resources or from secondary sources, has become necessary, including recovery from mine tailings, recycling of end-of-life products and urban and industrial waste. Ionic solvents, including ionic liquids (ILs) and deep-eutectic solvents (DESs), have attracted much attention since they represent an alternative to conventional processes for metal recovery. These systems are used as reactive agents in leaching and extraction processes. The most significant studies reported in the last decade regarding the recovery of REEs are presented in this review.
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91
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Stoy L, Diaz V, Huang CH. Preferential Recovery of Rare-Earth Elements from Coal Fly Ash Using a Recyclable Ionic Liquid. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:9209-9220. [PMID: 34159779 DOI: 10.1021/acs.est.1c00630] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Recent global geopolitical tensions have exacerbated the scarcity of rare-earth elements (REEs), which are critical across many industries. REE-rich coal fly ash (CFA), a coal combustion residual, has been proposed as a potential source. Conventional REE-CFA recovery methods are energy- and material-intensive and leach elements indiscriminately. This study has developed a new valorization process based on the ionic liquid (IL) betainium bis(trifluoromethylsulfonyl)imide ([Hbet][Tf2N]) for preferential extraction of REEs from different CFAs. Efficient extraction relies on [Hbet][Tf2N]'s thermomorphic behavior with water: upon heating, water and the IL form a single liquid phase, and REEs are leached from CFA via a proton-exchange mechanism. Upon cooling, the water and IL separate, and leached elements partition between the two phases. REEs were preferentially extracted over bulk elements from CFAs into the IL phase and then recovered in a subsequent mild-acid stripping step, regenerating the IL. Alkaline pretreatment significantly improved REE leaching efficiency from recalcitrant Class-F CFAs, and additional betaine improved REE and bulk element separation. Weathered CFA showed slightly higher REE leaching efficiency than unweathered CFA, and Class-C CFA demonstrated higher leaching efficiency but less selective partitioning than Class-F CFAs. Significantly, this method consistently exhibits a particularly high extraction efficiency for scandium across different CFAs.
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Affiliation(s)
- Laura Stoy
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Victoria Diaz
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- College of Engineering, Chemical Engineering, California State University, Long Beach, Long Beach, California 90840, United States
| | - Ching-Hua Huang
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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92
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In-situ electrochemical oxide monitoring in LiF-NdF3-Nd2O3: Application to Nd2O3 solubility determination. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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93
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Selective recovery of rare earth elements with ligand-functionalized polymers in fixed-bed adsorption columns. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118472] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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94
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Liu Z, Guo C, Tai P, Sun L, Chen Z. The exposure of gadolinium at environmental relevant levels induced genotoxic effects in Arabidopsis thaliana (L.). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 215:112138. [PMID: 33740487 DOI: 10.1016/j.ecoenv.2021.112138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 03/03/2021] [Accepted: 03/07/2021] [Indexed: 06/12/2023]
Abstract
Rare Earth Elements (REEs) are increasingly being used in agriculture and are also used to produce high end technological devices, thereby increasing their anthropogenic presence in the environment. However, the ecotoxicological mechanism of REEs on organisms is not fully understood. In this study, the effects of gadolinium (Gd) addition on Arabidopsis thaliana (L.) were investigated at both physiological and molecular levels. Four treatments (0, 10, 50 and 200 μmol·L-1 Gd) were used in the exposure tests. Biomass, root length and chlorophyll content in shoots/roots were measured to investigate the plant's physiological response to Gd stress. Random amplified polymorphic (RAPD)-Polymerase Chain Reaction (PCR) and methylation sensitive arbitrarily primed (MSAP)-PCR were used to investigate changes in genetic variation and DNA methylation of A. thaliana when exposed to Gd. At the physiological level, it was found that low concentration of Gd (10 μmol·L-1) could significantly increase the plant biomass and root length, while the growth of A. thaliana was significantly inhibited when exposed to 200 μmol·L-1 of Gd, yet the total soluble protein content in aerial plant parts increased significantly by 24.2% when compared to the control group. Among the 12 primers considered in the RAPD assessment, at the molecular level, only four primers revealed different patterns in their genomic DNA. Compared to the control group, the treatment with 50 μmol·L-1 of Gd was associated with lower polymorphism, while the treatment with 200 μmol·L-1 of Gd was associated with higher polymorphism. The polymorphism frequencies for the 50 μmol·L-1 of Gd and the 200 μmol·L-1 of Gd were 4.67% and 20.33%, respectively. The MSAP analysis revealed that the demethylation (D) type of Arabidopsis genomic DNA increased significantly under 10 and 50 μmol·L-1 of Gd, while the methylation (M) type was also significantly increased under 200 μmol·L-1 of Gd. Generally, the total methylation polymorphism (D+M) increased with an increase of Gd concentration. It was found that high concentrations of Gd appeared to cause DNA damage, but low concentrations of Gd (as low as 10 μmol·L-1) were associated with DNA methylation change. Further, it was verified by Real time Reverse Transcription PCR (RT-PCR) on the bands detected by the MSAP analysis, that the genes relative to processes including cell cycle, oxidative stress and apoptosis, appeared to be regulated by methylation under Gd stress. These findings reveal new insight regarding ecotoxicity mechanisms of REEs on plants.
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Affiliation(s)
- Zhihong Liu
- Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116023, China
| | - Cheng Guo
- Liaoning Shihua University, Fushun 113001, China
| | - Peidong Tai
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
| | - Lizong Sun
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
| | - Zhenbo Chen
- Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116023, China
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95
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Start-up Strategies for Anaerobic Ammonia Oxidation (Anammox) in In-Situ Nitrogen Removal from Polluted Groundwater in Rare Earth Mining Areas. SUSTAINABILITY 2021. [DOI: 10.3390/su13084591] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The tremendous input of ammonium and rare earth element (REE) ions released by the enormous consumption of (NH4)2SO4 in in situ leaching for ion-adsorption RE mining caused serious ground and surface water contamination. Anaerobic ammonium oxidation (anammox) was a sustainable in situ technology that can reduce this nitrogen pollution. In this research, in situ, semi in situ, and ex situ method of inoculation that included low-concentration (0.02 mg·L−1) and high-concentration (0.10 mg·L−1) lanthanum (La)(III) were adopted to explore effective start-up strategies for starting up anammox reactors seeded with activated sludge and anammox sludge. The reactors were refrigerated for 30 days at 4 °C to investigate the effects of La(III) during a period of low-temperature. The results showed that the in situ and semi in situ enrichment strategies with the addition of La(III) at a low-concentration La(III) addition (0.02 mg·L−1) reduced the length of time required to reactivate the sludge until it reached a state of stable anammox activity and high nitrogen removal efficiency by 60–71 days. The addition of La(III) promoted the formation of sludge floc with a compact structure that enabled it to resist the adverse effects of low temperature and so to maintain a high abundance of AnAOB and microbacterial community diversity of sludge during refrigeration period. The addition of La(III) at a high concentration caused the cellular percentage of AnAOB to decrease from 54.60 ± 6.19% to 17.35 ± 6.69% during the enrichment and reduced nitrogen removal efficiency to an unrecoverable level to post-refrigeration.
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96
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Artiushenko O, Zaitsev V, Rojano WS, Freitas GA, Nazarkovsky M, Saint'Pierre TD, Kai J. Rationally designed dipicolinate-functionalized silica for highly efficient recovery of rare-earth elements from e-waste. JOURNAL OF HAZARDOUS MATERIALS 2021; 408:124976. [PMID: 33429146 DOI: 10.1016/j.jhazmat.2020.124976] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 12/18/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
Composition of the immobilized layer plays a crucial role in metal adsorption properties of complexing organo-mineral materials. Ignoring the specific features of chemical reactions on solid surface can lead to a significant deterioration in the target properties of the resulted materials. In this research we demonstrated that rationally designed surface-assembling synthesis of organo-silica with covalently immobilized fragments of dipicolinic acid (DPA) resulted in the adsorbent that is capable quantitively recover almost all Rare Earth elements (REEs) from multielement solution with pH > 1.7. In ten consecutive adsorption/desorption cycles no noticeable loss of its efficiency was found, with a mean value of REEs recovery larger than 97%. The adsorbent has been used to recover REEs from model solutions (22 metal ions in 0.5 mol L-1 NaCl) and real leaching solution of waste of fluorescent lamps. It was demonstrated that even 3200-fold excess of Fe and Cu ions only slightly reduces REEs recovery. The adsorbent is capable to recover above 80% of all (except La) REEs from acidic leaching solution from fluorescent lamps with enrichment factors above 600. After adsorption of Eu3+ and Tb3+, the resulting materials exhibited strong red and green luminescence, respectively, indicating chelating mechanism of REEs adsorption on SiO2-DPA.
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Affiliation(s)
- Olena Artiushenko
- Pontifical Catholic University of Rio de Janeiro, Marquês de São Vicente St. 225, Rio de Janeiro 22451-900, Brazil
| | - Vladimir Zaitsev
- Pontifical Catholic University of Rio de Janeiro, Marquês de São Vicente St. 225, Rio de Janeiro 22451-900, Brazil; National University of Kyiv-Mohyla Academy, 2 Skovorody vul., Kyiv 04070, Ukraine.
| | - Wendy S Rojano
- Pontifical Catholic University of Rio de Janeiro, Marquês de São Vicente St. 225, Rio de Janeiro 22451-900, Brazil
| | - Gabriel A Freitas
- Pontifical Catholic University of Rio de Janeiro, Marquês de São Vicente St. 225, Rio de Janeiro 22451-900, Brazil
| | - Michael Nazarkovsky
- Pontifical Catholic University of Rio de Janeiro, Marquês de São Vicente St. 225, Rio de Janeiro 22451-900, Brazil
| | - Tatiana D Saint'Pierre
- Pontifical Catholic University of Rio de Janeiro, Marquês de São Vicente St. 225, Rio de Janeiro 22451-900, Brazil
| | - Jiang Kai
- Pontifical Catholic University of Rio de Janeiro, Marquês de São Vicente St. 225, Rio de Janeiro 22451-900, Brazil
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97
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Dourdain S, Špadina M, Rey J, Bohinc K, Pellet-Rostaing S, Dufrêche JF, Zemb T. How Acidity Rules Synergism and Antagonism in Liquid–Liquid Extraction by Lipophilic Extractants—Part I: Determination of Nanostructures and Free Energies of Transfer. SOLVENT EXTRACTION AND ION EXCHANGE 2021. [DOI: 10.1080/07366299.2021.1899606] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- S. Dourdain
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
| | - M. Špadina
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
- Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | - J. Rey
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
| | - K. Bohinc
- Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
| | | | | | - T. Zemb
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
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98
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Self-separation of the adsorbent after recovery of rare-earth metals: Designing a novel non-wettable polymer. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.118152] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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99
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Hei X, Li J. All-in-one: a new approach toward robust and solution-processable copper halide hybrid semiconductors by integrating covalent, coordinate and ionic bonds in their structures. Chem Sci 2021; 12:3805-3817. [PMID: 34163651 PMCID: PMC8179474 DOI: 10.1039/d0sc06629j] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Conventional inorganic semiconductors are best known for their superior physical properties and chemical robustness, and their widespread use in optoelectronic devices. However, implementation of these materials in many other applications has been hindered by their poor solubility and/or solution-processability, a longstanding drawback that is largely responsible for issues such as high cost. While recent progress on hybrid perovskites, an important class of inorganic-organic hybrid materials, has shed light on the development of high-performance solution processable semiconductors, they rely heavily on toxic metals and generally suffer from framework instability. To address these issues, a new group of hybrid semiconductors based on anionic copper(i) halide and cationic organic ligands has been developed. These compounds are noted as All-In-One (AIO) structures as they consist of covalently bonded anionic CuX inorganic modules that form both coordinate and ionic bonds with cationic organic ligands. Studies demonstrate that framework stability and solution processibility of these materials are greatly enhanced as a result of such bonds. In the perspective, we highlight the development of this newly emerged type of materials including their crystal structures, chemical and physical properties and possible applications. The untapped potential that the AIO approach can offer for other hybrid families is also discussed.
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Affiliation(s)
- Xiuze Hei
- Department of Chemistry and Chemical Biology, Rutgers University Piscataway New Jersey 08854 USA
| | - Jing Li
- Department of Chemistry and Chemical Biology, Rutgers University Piscataway New Jersey 08854 USA
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100
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Study on interaction mechanism of different atomic ratio of neodymium, arsenic and iron. Sci Rep 2021; 11:4264. [PMID: 33608573 PMCID: PMC7895936 DOI: 10.1038/s41598-021-83698-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 02/05/2021] [Indexed: 11/08/2022] Open
Abstract
In this study, neodymium and arsenic were sealed into industrial pure iron cylinders at a temperature of 1223 K for 50 h. The interaction mechanism of the Nd-Fe-As system at various atomic ratios was investigated by optical microscopy, X-ray diffractometry, and scanning electron microscopy. Binary compounds Fe12As5, NdAs, Fe2As, and Fe17Nd2 were the main products formed, with traces of NdFeAs compounds. In addition, at high temperatures, As content affected the diffusion of Fe atoms; the diffusion of Fe increased with an increase in the atomic ratio. Furthermore, the diffusion ability of Nd was weaker than that of As. The major diffusion mechanism of Nd was through the Fe atomic vacancy mechanism. As mainly bind to Fe to form Fe and As compounds. The formation of ternary compounds was confirmed by laboratory experiments and mismatch calculations.
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