Adsorption of Rare Earth Elements from Aqueous Solutions Using Geopolymers

Fiket, Željka; Galović, Ana; Medunić, Gordana; Turk, Martina Furdek; Ivanić, Maja; Dolenec, Matej; Biljan, Ivica; Šoster, Aleš; Kniewald, Goran

doi:10.3390/iecg_2018-05349

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…Furthermore, the recycling of REEs from various end-of-life products is challenging. Fiket et al (2018) reported a preliminary study in which they adsorbed Ce, La, Nd, Pm, Dy, Er, Eu, Gd, Ho, Lu, Sc, Sm, Tb, Tm, Y, and Yb from multi-element solution (total concentration of REEs was 1 mg/L) on coal fly ash-geopolymer. Their results demonstrate that all studied REEs were adsorbed quite effectively when using contact time of 120 min and that the geopolymer SiO 2 /Na 2 O ratio of 0.7-0.8 was more efficient than 1.1-1.3.…”

Section: Preparationmentioning

confidence: 99%

Application of alkali-activated materials for water and wastewater treatment: a review

Luukkonen

Heponiemi

Runtti

et al. 2019

Rev Environ Sci Biotechnol

136

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Alkali-activation (or geopolymer) technology has gained a great deal of interest for its potential applications in water and wastewater treatment during the last decade. Alkali-activated materials can be prepared via a relatively simple and low-energy process, most commonly by treating aluminosilicate precursors with concentrated alkali hydroxide and/or silicate solutions at (near) ambient conditions. The resulting materials are, in general, amorphous, have good physical and chemical stability, ion-exchange properties, and a porous structure. Several of the precursors are industrial by-products or other readily available low-cost materials, which further enhances the environmental and economic feasibility. The application areas of alkali-activated materials in water and wastewater treatment are adsorbents/ion-exchangers, photocatalysts, high-pressure membranes, filter media, anti-microbial materials, pH buffers, carrier media in bioreactors, and solidification/stabilization of water treatment residues. The purpose of this review is to present a comprehensive evaluation of the rapidly growing prospects of alkali-activation technology in water and wastewater treatment.

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Section: Preparationmentioning

confidence: 99%

Application of alkali-activated materials for water and wastewater treatment: a review

Luukkonen

Heponiemi

Runtti

et al. 2019

Rev Environ Sci Biotechnol

136

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“…These nanostructures enhance REE adsorption due to a larger area-to-volume ratio, porosity, stability, and reduced density. In this sense, some geopolymers that help to separate HREE and LREE help to remove REE from the bulk and can facilitate subsequent separation [92].…”

Section: Separation By Adsorptionmentioning

confidence: 99%

A Comparative Study on Recent Developments for Individual Rare Earth Elements Separation

2023

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Facilitating the demands of modern society, namely, smartphones, televisions, electric vehicles, and high-stability aircraft structures, requires low-cost and high-performance materials and a corresponding change in the approach needed to design them. Rare earth elements (REEs) play a significant role in achieving these objectives by adding small amounts of these elements to alloys, thereby enhancing material properties. Despite being more abundant than precious metals, the 17 REEs exhibit subtle variations in their chemical and physical characteristics. Thus, their separation is still crucial for industrial applications. There is a corresponding need to develop more effective and efficient separation methods. Adding to the separation challenge is the complexity of the sources of REEs and related materials. Thus, large-scale production of REE materials is difficult. Current REE processing techniques can be categorized into pre-treatment, beneficiation, separation, and refining. Researchers have developed various technologies encompassing chemical, physical, and biological methods, focusing on economic and environmental considerations. However, not all these approaches can be scaled up for mass production. This article focuses on feasible strategies such as precipitation and crystallization, oxidation and reduction, ion exchange, adsorption, solvent extraction, and membrane separation. Further research into these traditional and modern methods can potentially revolutionize the separation dynamics of REEs.

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