Rare earth elements in tropical soils, Cameroon soils (Central Africa)

Temga, Jean Pierre; Sababa, Elisé; Mamdem, Lionelle Estelle; Bijeck, Marie Louise Ngo; Azinwi, Primus Tamfuh; Nathanael, Tehna; Zame, Philémon Zo’o; Onana, Vincent Laurent; Nguetnkam, Jean Pierre; Bitom, Lucien Dieudonné; Ndjigui, Paul‐Désiré

doi:10.1016/j.geodrs.2021.e00369

Cited by 19 publications

(6 citation statements)

References 101 publications

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“…This source rocks are enriched with REEs (Yibas et al, 2003). Also, these close relationships between the REEs suggests the coexistence and similar REE sources during geochemical processes (Gwenzi et al, 2018, Temga et al, 2021. Sm exhibited no significant correlation with the recorded REEs (Table 4).…”

Section: Concentrations Of Rees and Characteristic Of Nilementioning

confidence: 87%

Central Nile Valley agriculture soil content and distribution of rare earth elements (REEs), Egypt

Belal,

Abou El-Anwar,

Seleem

et al. 2024

Egyptian Journal of Geology

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he Nile Valley hosted the world's oldest civilizations because of the quality of the agricultural soil and the waters of the Nile River. Despite the importance of the Egyptian agricultural soil, there is a scarcity of information about its chemical and mineral composition. Therefore, this research is concerned with the soil content of rare earth elements (REEs), as it has become one of the elements with a harmful effect and considered emerging contaminants. The concentration of only 6 REEs were recorded in the agricultural soil of Assiut Governorate; Sc, Y, La, Ce, Sm and Nd with concentrations 26.6, 22.2, 33, 62.2, 8 and 30.6 µg/g, respectively. However, the average REEs (182.6 µg/g) was higher than the upper continental crust (179.4 µg/g), world soil (145.3 µg/g), Chinese soil background (163.86 µg/g). This indicates the enrichment of the Egyptian soil with these elements. This enrichment may be due to the nature of the source rocks or the applied fertilizers. Where phosphate fertilizers (rich in elements) are applied frequently to improve soil productivity.

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Section: Concentrations Of Rees and Characteristic Of Nilementioning

confidence: 87%

Central Nile Valley agriculture soil content and distribution of rare earth elements (REEs), Egypt

Belal,

Abou El-Anwar,

Seleem

et al. 2024

Egyptian Journal of Geology

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“…The pseudo-second-order model is suitable for the description of the chemical adsorption, which involves a chemical adsorption between the negatively charged surface and metal ions: q = q 2 e k 2 t 1 + q e k 2 t (10) The Elovich model is used to describe chemical adsorption on heterogeneous surfaces. The model assumes that the rate of biosorption decreases exponentially with an increase in the amount of adsorbate [70]:…”

Section: Equilibrium and Kinetics Of The Terbium Adsorption Processmentioning

confidence: 99%

Terbium Removal from Aqueous Solutions Using a In2O3 Nanoadsorbent and Arthrospira platensis Biomass

Al-Bagawi,

Yushin,

Hosny

et al. 2023

Nanomaterials

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Terbium is a rare-earth element with critical importance for industry. Two adsorbents of different origin, In2O3 nanoparticles and the biological sorbent Arthrospira platensis, were applied for terbium removal from aqueous solutions. Several analytical techniques, including X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy, were employed to characterize the adsorbents. The effect of time, pH, and terbium concentration on the adsorption efficiency was evaluated. For both adsorbents, adsorption efficiency was shown to be dependent on the time of interaction and the pH of the solution. Maximum removal of terbium by Arthrospira platensis was attained at pH 3.0 and by In2O3 at pH 4.0–7.0, both after 3 min of interaction. Several equilibrium (Langmuir, Freundlich, and Temkin) and kinetics (pseudo-first order, pseudo-second order, and Elovich) models were applied to describe the adsorption. The maximum adsorption capacity was calculated from the Langmuir model as 212 mg/g for Arthrospira platensis and 94.7 mg/g for the In2O3 nanoadsorbent. The studied adsorbents can be regarded as potential candidates for terbium recovery from wastewater.

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“…These modest REE concentrations are economic for the southern China deposits because (a) the REE can be easily extracted from the clays with weak acids, (b) the deposits are often enriched in the high-value HREE, (c) the area has low labor costs and (d) there has been a localized lack of environmental protection (Liang et al, 2014). Temga et al (2021) have reported high REE-enrichment in soils controlled by ion-adsorption clays, carbonate and Fe-Mn oxides in tropical Cameroonian soils. The soils developed on alkaline igneous rocks usually show great or high REE contents, ranging from 678.73 to 1148.02 µg/g, whereas on limestones the REE contents vary from 152 to 1927 µg/g.…”

Section: Ion-adsorption Depositsmentioning

confidence: 99%

Environmental Technologies to Treat Rare Earth Element Pollution: Principles and Engineering

2022

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Rare earth elements (REE) have applications in various modern technologies, e.g., semiconductors, mobile phones, magnets. They are categorized as critical raw materials due to their strategic importance in economies and high risks associated with their supply chain. Therefore, more sustainable practices for efficient extraction and recovery of REE from secondary sources are being developed. This book, Environmental Technologies to Treat Rare Earth Elements Pollution: Principles and Engineering: presents the fundamentals of the (bio)geochemical cycles of rare earth elements and which imbalances in these cycles result in pollution.overviews physical, chemical and biological technologies for successful treatment of water, air, soils and sediments contaminated with different rare earth elements.explores the recovery of value-added products from waste streams laden with rare earth elements, including nanoparticles and quantum dots. This book is suited for teaching and research purposes as well as professional reference for those working on rare earth elements. In addition, the information provided in this book is helpful to scientists, researchers and practitioners in related fields, such as those working on metal/metalloid microbe interaction and sustainable green approaches for resource recovery from wastes. ISBN: 9781789062229 (Paperback) ISBN: 9781789062236 (eBook) ISBN: 9781789062243 (ePUB)

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Rare earth elements in tropical soils, Cameroon soils (Central Africa)

Cited by 19 publications

References 101 publications

Central Nile Valley agriculture soil content and distribution of rare earth elements (REEs), Egypt

Central Nile Valley agriculture soil content and distribution of rare earth elements (REEs), Egypt

Terbium Removal from Aqueous Solutions Using a In2O3 Nanoadsorbent and Arthrospira platensis Biomass

Environmental Technologies to Treat Rare Earth Element Pollution: Principles and Engineering

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