Article
Spectroscopy
Ilemona C. Okeme, Peter G. Martin, Christopher Jones, Richard A. Crane, Theophilus Ojonimi, Konstantin Ignatyev, Dave Megson-Smith, Thomas B. Scott
Summary: Analysis of Nigerian simulated fly ash samples revealed high total REE content, primarily consisting of critical REE such as Nd, Eu, Tb, Dy, Y and Er. These REE were mainly associated with discrete mineral particles such as monazite, xenotime and Y-bearing zircon. Monazite particles isolated from the samples showed a core-shell structure with Ce, Nd and La enriched in the shell and U and Th enriched in the core.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2021)
Article
Metallurgy & Metallurgical Engineering
Sabrina Hedrich, Anja Breuker, Mirko Martin, Axel Schippers
Summary: Sands from the German Baltic Sea coast are recovered as construction material and contain heavy minerals enriched with zircon, garnet, ilmenite, rutile, magnetite, and monazite. Gravity and magnetic separation can be used to concentrate the heavy minerals. Bioleaching experiments were conducted on zircon concentrates and eudialyte concentrates containing rare earth elements (REE), but the results showed limitations in the extraction of REEs from heavy minerals through bioleaching.
Article
Metallurgy & Metallurgical Engineering
Adrian Carrillo Garcia, Mohammad Latifi, Jamal Chaouki
Summary: The study investigated the calcination process of a rare earth carbonatite ore from Niobec in Quebec, Canada, focusing on the decomposition of bastnasite and monazite. A global kinetic model was developed to represent the calcination kinetics of the whole ore based on individual calcination kinetics of the minerals nested in the ore. Initially developed for small particles, the model was later adapted to larger particle sizes by including coefficients based on physical particle size parameters.
Article
Metallurgy & Metallurgical Engineering
Luver Echeverry-Vargas, Nestor Ricardo Rojas-Reyes, Luz Marina Ocampo-Carmona
Summary: This paper investigates the leaching conditions of hydrochloric acid and sulfuric acid for the maximum extraction of cerium, lanthanum, and neodymium from a dephosphorized monazite concentrate. The experiments showed that sulfuric acid performed better in terms of extraction efficiency. The addition of hydrogen peroxide further enhanced the dissolution of rare earth elements in sulfuric acid. The recovered rare earths can be converted to oxides through precipitation with oxalic acid and subsequent calcination.
Article
Metallurgy & Metallurgical Engineering
Raphael Cruz Alves, Marisa Nascimento, Jessica Frontino Paulino, Julio Carlos Afonso
Summary: This work focuses on processing a monazite concentrate containing iron mineral phases to recover rare earth elements, with the alkaline conversion route showing the best combined recovery and selectivity results for lanthanum and iron. Various experimental designs were used to determine the key variables for each processing route, with temperature playing a significant role in all three routes.
Article
Engineering, Environmental
Ghazaleh Shakiba, Roozbeh Saneie, Hadi Abdollahi, Ehsan Ebrahimi, Ali Rezaei, Mohsen Mohammadkhani
Summary: In this paper, deep eutectic solvents (DESs) were applied as a green replacement for conventional solvents in the leaching process of REEs from monazite. The DES comprised of 2ChCl:1PTSA exhibited the highest extraction efficiency.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Anthony Boxleiter, W. Crawford Elliott
Summary: The presence of rare-earth elements (REE) in kaolin, mine tailings, and associated sand lithology raises questions about their occurrence and the role of weathering and secondary processes in their formation. Mineralogical analyses show that REE are primarily hosted by phosphate minerals (monazite, xenotime). There is a strong correlation between REE and P concentrations, indicating the importance of chemical weathering. The presence of xenotime overgrowths on zircon suggests post-depositional processes leading to redistributed and fractionated REE within kaolin.
CLAYS AND CLAY MINERALS
(2023)
Article
Engineering, Environmental
A. H. Ali, G. A. Dakroury, M. S. Hagag, Sh M. Abdo, K. F. Allan
Summary: In this study, a novel composite P(AA-co-AM/PJM-T) was synthesized by copolymerizing acrylic acid, acrylamide, and 16,16-dimethylheptadecan-1-amine using gamma irradiation. The composite was characterized and utilized as a sorbent for rare earth elements from monazite. The sorption process was found to be spontaneous, with a maximum adsorption capacity of 182.15 ± 3.73 mg g(-1) at 25 degrees Celsius.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Metallurgy & Metallurgical Engineering
George Blankson Abaka-Wood, Jonas Addai-Mensah, William Skinner
Summary: The study characterized tailings from a copper processing plant and found that they are rich in rare earth elements, with over 90% recovery achieved through froth flotation. With systematic optimization studies, further enhancement of rare earth element recovery and upgrade efficiency is possible.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2022)
Article
Engineering, Chemical
Sergio Sanchez-Segado, Shannon Stodd, Vitalis Chipakwe, Edward Loye, Martin Smith, Frances Wall, Andrew P. Abbott, Animesh Jha
Summary: The physico-chemical changes occurring during the high-temperature phase transformation of monazite in the presence of Na2CO3 at 1000 C for 2 h duration at monazite: Na2CO3 ratios between 1.0 and 5.0 were investigated. The formation of sodium lanthanide phosphates was prevalent above a monazite:alkali ratio of 2, however, below this ratio, the dephosphorization of monazite as Na3PO4 and Ce(1-x)Ln(x)O(2-x/2) solid solutions occur offering unique selectivity for rare-earth oxide separation from the mineral matrix. Cyclic voltammetry of pure CeO2, La2O3, Nd(2)O3, and PrO2/Pr2O3 was carried out in the deep eutectic solvent Ethaline (1:2 mixture of choline chloride and ethylene glycol) proving the electrochemical activity of these oxides. Electrodissolution of pure oxides and water-leached monazite after high-temperature reaction with a ratio of 1:1 was carried out in a 0.1 mol/L glucose solution in Ethaline showing a preferential solubility of 23.85% for pure Nd2O3. In contrast, pure oxides of CeO2, La2O3 and PrO2/Pr2O3 were found to be insoluble. We also observed that electrodissolution of the water leached monazite was not possible because of the inert behaviour of Ce(1-x)Ln(x)O(2-x/2) solid solutions. Avoiding cerium oxidation during the high-temperature process will lead to a method for further selectivity for rare-earth oxide processing using staged electro-chemical winning of oxides.
MINERALS ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
Mahmoud O. Abd El-Magied
Summary: Rare earth elements, especially cerium, have become increasingly important in high-tech industries and medical applications due to their superior chemical characteristics. This study developed functionalized chitosan macromolecule sorbents from shrimp waste to recover cerium ions from a leached monazite liquor. The biosorbents exhibited high affinities for cerium ions, with removal percentages of 85.73% and 90.92% for polyamines and polycarboxylate chitosan sorbents, respectively. These results demonstrate the high biosorption capacity of the biosorbents for cerium ions in aqueous and leach liquor streams.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Energy & Fuels
Juanjuan Ma, Shuyan Li, Jinxi Wang, Shuting Jiang, Balaji Panchal, Yuzhuang Sun
Summary: This study optimized the culture conditions and bioleaching process of Aspergillus niger for the extraction of rare earth elements (REEs) from coal fly ash (CFA). It was found that organic nitrogen sources influenced the morphology and acid production capacity of A. niger, with oxalic acid being the main acid secreted (4.05 mg/L). The initial pH value was identified as the most influential factor affecting the bioleaching process, and by optimizing it, a leaching rate of 30.91% for total REEs in CFA was achieved. The main mechanism of REEs bioleaching by A. niger from CFA was speculated to be proton exchange and organic ligand complexation.
Article
Biotechnology & Applied Microbiology
Michael Paper, Max Koch, Patrick Jung, Michael Lakatos, Tom Nilges, Thomas B. Brueck
Summary: This study investigated the potential of 12 cyanobacterial strains for biosorption of rare earth elements, and Nostoc sp. 20.02 showed the highest adsorption capacity. Synechococcus elongatus UTEX 2973, Calothrix brevissima SAG 34.79, Desmonostoc muscorum 90.03, and Komarekiella sp. 89.12 were also promising strains. The adsorption of metals by the strains had fast kinetics and pH value had a significant impact on the process.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Nuclear Science & Technology
Batuhan Gultekin, Fatih Bulut, Hatice Yildiz, Hakan Us, Hasan Ogul
Summary: Radiation shielding materials play a crucial role in nuclear technologies, and polymer materials, especially those created using 3D printing technology, offer significant advantages in terms of their properties and characteristics for radiation shielding applications.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Review
Engineering, Environmental
Emmanuel Yaw Owusu-Fordjour, Xinbo Yang
Summary: Bioleaching, using microorganisms to dissolve minerals and extract Rare Earth Elements (REEs) in aqueous media, has gained attention for its potential eco-friendliness compared to other extraction methods. Mixed culture bioleaching is preferred for efficient REEs extraction, promoting closed-loop recycling and reducing supply chain issues. This literature review provides an overview of challenges, opportunities, microorganisms, mechanisms, approaches, parameters, and techno-economic considerations related to REEs bioleaching, and offers recommendations for future advancements.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Analytical
Luana S. Moreira, Ana P. R. Santana, Floriatan S. Costa, Josiane B. Vera, Mario H. Gonzalez, Erik G. P. da Silva, Clarice D. B. Amaral
Summary: A natural deep eutectic solvent (NADES) was used as a solvent in ultrasound-assisted extraction (UAE) for the determination of As and Cd in fish and shellfish samples. The study found that the use of KED mode resulted in higher sensitivity, and the extraction procedure was accurate and reliable.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Review
Chemistry, Analytical
Adriana Gioda, Karmel Beringui, Elizanne P. S. Justo, Luciana M. B. Ventura, Carlos G. Massone, Silvanio Silverio Lopes Costa, Sidimar Santos Oliveira, Rennan Geovanny Oliveira Araujo, Nivia de M. Nascimento, Hemmely Guilhermond S. Severino, Christiane B. Duyck, Jefferson Rodrigues de Souza, Tatiana D. Saint Pierre
Summary: Atmospheric pollution is a significant issue with impacts on the environment and human health. Understanding the composition and concentration levels of pollutants is crucial for reducing emissions and setting limits. Advances in air sampling and analysis methods have been made, and data analysis plays a key role in informing government actions against air pollution.
CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Laisa Santana Nogueira, Iasnaia Maria de Carvalho Tavares, Nivio Batista Santana, Sibelli Passini Barbosa Ferrao, Jabson Meneses Teixeira, Floriatan Santos Costa, Tatielle Pereira Silva, Hugo Juarez Vieira Pereira, Muhammad Irfan, Muhammad Bilal, Julieta Rangel de Oliveira, Marcelo Franco
Summary: The trypsin-like protease produced by Penicillium roqueforti shows excellent activity and stability at alkaline pH and high temperatures, making it suitable for applications in the food industry. Multivariate experimental design optimization has broadened the potential uses of this enzyme.
BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
(2022)
Article
Food Science & Technology
Luana S. Moreira, Floriatan S. Costa, Rita de Cassia Lidorio, Luan W. S. Toledo, Andrea Oliveira, Mario H. Gonzalez, Erik G. P. da Silva, Clarice D. B. Amaral
Summary: In this study, formic acid was used for the extraction of Cd and Pb in biological tissues, followed by graphite furnace atomic absorption spectrometry (GF AAS) for their determination. The accuracy and precision of the method were evaluated using certified reference materials, and the limits of quantification were found to be below the regulatory limits. The method was successfully applied to mollusks and fish tissue samples from coastal areas in Brazil, showing concentrations below the allowed limits, except for one mollusk sample. This study presents a promising and cost-effective analytical procedure for the extraction of toxic elements in biological tissues.
FOOD ANALYTICAL METHODS
(2022)
Article
Biochemistry & Molecular Biology
Camila Cruz Pereira Almenara, Thiago Fernandes de Oliveira, David Chaves Felicio da Silva, Maiara Krause, Maria Tereza W. D. Carneiro, Alessandra Simao Padilha
Summary: This study found that the effects of chronic cadmium exposure, including high blood pressure and endothelial damage, can be reversed by interrupting the exposure to the metal. This reversal may be due to an improvement in antioxidant enzymes and eNOS function.
BIOLOGICAL TRACE ELEMENT RESEARCH
(2023)
Article
Environmental Sciences
Marise Silva de Carvalho, Luiz Henrique Sales de Menezes, Adriana Bispo Pimentel, Floriatan Santos Costa, Polyane Cabral Oliveira, Marta Maria Oliveira dos Santos, Iasnaia Maria de Carvalho Tavares, Muhammad Irfan, Muhammad Bilal, Joao Carlos Teixeira Dias, Julieta Rangel de Oliveira, Marcelo Franco
Summary: In this study, a comprehensive investigation was conducted on the production of xylanase by solid-state fermentation using Aspergillus oryzae ATCC 10124. Enzyme production was optimized through statistical designs for both the mixture of waste residues and fermentation parameters. The optimized process resulted in a significant increase (up to 165%) in enzymatic activity. The xylanase produced in this fermentation process exhibited alkaline characteristics and high thermal stability. Moreover, the multienzyme extract obtained directly from the fermentation process showed efficient saccharification capabilities without the need for enzyme purification.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Biochemistry & Molecular Biology
Thiago Fernandes de Oliveira, Emily Martineli Rossi, Charles Santos da Costa, Jones Bernardes Graceli, Maiara Krause, Maria Teresa Weitzel Dias Carneiro, Camila Cruz Pereira Almenara, Alessandra Simao Padilha
Summary: Cadmium exposure is associated with cardiovascular diseases, and its toxic effects vary depending on sex. This study revealed that 30 days of cadmium exposure induced sex-dependent cardiovascular abnormalities.
Article
Biochemistry & Molecular Biology
Mona Liza Santana, Iasnaia Maria de Carvalho Tavares, Floriatan Santos Costa, Elisa Teshima, Amanda Reges de Sena, Marcelo Franco, Sandra Aparecida de Assis
Summary: This study evaluated the effects of enzymatic treatment on guava juice using crude multi-enzymatic extracts (CME) from different yeast strains. The optimal conditions for CME treatment were determined using Doehlert planning, and significant reductions in viscosity and improvements in physical-chemical properties of the juice were observed.
BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
(2023)
Article
Biochemical Research Methods
Marta Maria Oliveira dos Santos Gomes, Izadora Santos Nicodemos, Monizy da Costa Silva, Davida Maria Ribeiro Cardoso dos Santos, Floriatan Santos Costa, Marcelo Franco, Hugo Juarez Vieira Pereira
Summary: This study focuses on the production, characterization, and application of an endoglucanase from Penicillium roqueforti using lignocellulosic agro-industrial wastes as a substrate during solid-state fermentation. The enzyme showed optimal activity at 50 degrees C and pH 4.0 and also demonstrated stability in a wide range of temperature and pH conditions. The addition of certain metal ions increased enzymatic activity, and the enzyme exhibited halotolerance. It was found that the endoglucanase was able to saccharify various agricultural wastes and the fermentable sugar production was significantly improved through optimization.
PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY
(2023)
Article
Chemistry, Applied
Jordan Brizi Neris, Jose Arnaldo S. Costa, Guilherme Martins Grosseli, Floriatan Santos Costa, Caio Marcio Paranhos
Summary: This study aims to evaluate the transport properties and CBZ adsorption capacities of PES/mesoparticles-based MMMs in aqueous solutions with different physicochemical characteristics. The results show that PES/SH-MCM-41-based MMMs have the highest potential for CBZ adsorption. The multivariate design results indicate that contact time, initial CBZ concentration, and the amount of SH-MCM-41 incorporated in MMM significantly influence the adsorption capacity, while pH does not affect it. Water permeability tests show a correlation between the H2O permeability and the porosity of the synthesized membranes. PES/SH-MCM-41-based MMMs exhibit high porosity and good ability to remove CBZ from water, regardless of the pH of the aqueous solutions.
REACTIVE & FUNCTIONAL POLYMERS
(2023)
Article
Biochemistry & Molecular Biology
Karoline Alves Rossi, Camila Cruz Pereira Almenara, Rakel Passos Simoes, Lorraine Christiny Costa Sepulchro Mulher, Maiara Krause, Maria Tereza W. D. Carneiro, Alessandra Simao Padilha
Summary: This study aimed to investigate the pressoric and vascular effects of a 7-day exposure to CdCl2 in Wistar rats. The results showed that rats exposed to cadmium had elevated blood pressure and increased contractile response to phenylephrine. In addition, the vasodilation responses mediated by acetylcholine and sodium nitroprussiate were impaired in cadmium-exposed rats.
BIOLOGICAL TRACE ELEMENT RESEARCH
(2023)
Article
Chemistry, Physical
Taciana G. S. Guimaraes, Floriatan Santos Costa, Iohanna M. N. R. Menezes, Ana P. R. Santana, Daniel F. Andrade, Andrea Oliveira, Clarice D. B. Amaral, Mario H. Gonzalez
Summary: An innovative extraction method using ultrasound-assisted matrix solid-phase dispersion (UA-MSPD) and microwave-assisted extraction (MAE) with amino acids-based deep eutectic solvents (AADES) was developed for the extraction of arsenic (As) from medicinal herbs. Optimal experimental conditions were determined through multivariate optimization using Doehlert design. The accuracy of the methods was evaluated using certified reference materials, and the proposed methods were shown to be environmentally friendly. The optimized methods were successfully applied for the determination of As in commercial medicinal herbs.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Letter
Clinical Neurology
Patricia Aurea Andreucci Martins Bonilha, Victoria Cavalcanti de Souza, Isadora Branda, Floriatan Santos Costa, Clarice D. B. Amaral, Beatriz Gioppo Betini, Egberto Reis Barbosa, Helio Afonso Ghizoni Teive
PARKINSONISM & RELATED DISORDERS
(2023)
