Selective separation of rare earth ions from aqueous solution using functionalized magnetite nanoparticles: kinetic and thermodynamic studies

Ashour, Radwa M.; El-Sayed, Ramy; Abdel‐Magied, Ahmed F.; Abdelkhalek, Ahmed; Ali, M. M.; Forsberg, Kerstin; Uheida, Abdusalam; Muhammed, Mamoun; Dutta, Joydeep

doi:10.1016/j.cej.2017.06.101

Cited by 136 publications

(41 citation statements)

References 48 publications

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“…Figure 5 demonstrated that the adsorbed amount of probe VOCs on Dt/S-1 (5 wt%) increased with increasing initial concentrations. In order to figure out adsorption isotherms of the adsorbent, the Henry model, Langmuir model and Freundlich model were utilized with Equations (5)–(7) [38]:Qe=kHCe Qe=QmaxkLCe1+kLCe Qe=kFCe1/n where Q max (mol·g −1 ) is the maximum adsorption capacity, k H is the Henry constant (L·g −1 ), k L (L·mmol −1 ) is the Langmuir equilibrium constant, k F (mmol 1−n ·L n ·g −1 ) is the Freundlich constant and 1/n is the heterogeneity factor.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption

Liu

Tian

2019

Materials

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Adsorption technology is an effective method to remove volatile organic compounds (VOCs). In this work, we prepared hierarchical porous materials using modified diatomite (Dt) as a support and nano-sized silicalite-1 (S-1) seeds as inorganic fillers, which were applied to adsorb volatile organic compounds (VOCs). The characterization of the composites indicated that S-1 was successfully coated onto the surface of modified Dt, and the best surface area of the composites was 398.8 m2/g, nearly 40 times as large as Dt. The adsorption capacities of Dt/S-1 composites for three probe VOCs (ethyl acetate, acetone, and toluene) were rather superior to Dt, and the composites had preferential adsorption selectivity for ethyl acetate. Effects of seeded zeolite contents and hydrothermal conditions for the adsorption capacity of composites were discussed in this paper. The composite seeded with 5 wt% S-1 zeolite, which was subsequently synthesized by hydrothermal reaction at 100 °C for four days, showed the maximum adsorption capacity (1.31 mmol/g for ethyl acetate). The pseudo second-order model provided a perfect fit to adsorption kinetics, while the Langmuir model agreed the best with the adsorption isotherms. In addition, the composites had selective adsorption to ethyl acetate among these three probes VOCs. The regeneration experiments were also carried out, and the adsorption efficiency of the adsorbents was still up to 67% after five adsorption–desorption cycles. The hierarchical porous Dt/S-1 composites have an excellent VOC adsorption performance, satisfactory selectivity, and recycling ability.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption

Liu

Tian

2019

Materials

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“…19 Separations based on adsorption or ion chromatography (IC) are attractive, greener alternatives that are applied for sample analysis and purification in different areas. [20][21][22][23] High-performance chelation ion chromatography (HPCIC) is a promising technique previously shown to be applicable to individual separation of REEs. [24][25][26] HPCIC is a mode of ion chromatography based on the formation and dissociation of complexes formed on the surface of a ligand-functionalized stationary phase.…”

Section: Introductionmentioning

confidence: 99%

DTPA-Functionalized Silica Nano- and Microparticles for Adsorption and Chromatographic Separation of Rare Earth Elements

Ashour

Samouhos

Legaria

et al. 2018

ACS Sustainable Chem. Eng.

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“…Metal oxide adsorbents such as the oxides of Fe and Mn [62] have been predominantly examined for REE adsorption. Functionalized magnetic nanoparticles, for example [63], have gained considerable interest due to simple recovery of the adsorbent material via magnetic field.…”

Section: Adsorptionmentioning

confidence: 99%

On the Extraction of Rare Earth Elements from Geothermal Brines

2017

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The availability of rare earth elements from primary resources has come into question in the last two decades. This has sparked various government and industry initiatives to examine potential rare earth element resources apart from virgin ore bodies. Geothermal fluids are potentially significant sources of valuable minerals and metals, while co-recovery with geothermal energy production would be an attractive sustainable system. In this work, we give a brief survey of data collected on rare earth element concentrations in geothermal fluids. A survey of methods and technologies for extracting rare earth elements from geothermal is discussed along with the feasibility of recovering rare earth elements from geothermal brines. Based on the findings of this study, rare earth element extraction from geothermal fluids is technically possible, but neither economically viable nor strategically significant at this time.

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Selective separation of rare earth ions from aqueous solution using functionalized magnetite nanoparticles: kinetic and thermodynamic studies

Cited by 136 publications

References 48 publications

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption

Fabrication of Diatomite/Silicalite-1 Composites and Their Property for VOCs Adsorption

DTPA-Functionalized Silica Nano- and Microparticles for Adsorption and Chromatographic Separation of Rare Earth Elements

On the Extraction of Rare Earth Elements from Geothermal Brines

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