Modification of Mg-Fe hydrotalcite using Cyanex 272 for lanthanides separation

Gasser, M.S.; Sherif, E. El; Rahman, Rehab O. Abdel

doi:10.1016/j.cej.2017.01.129

Cited by 26 publications

(7 citation statements)

References 63 publications

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“…4), for both samples are consistent with the theoretical results (Fig. S1 (a,b)) and confirms the presence of iron hydroxides species, ammonium sulfate and potassium sulfate in MIINPs-1 and iron-iodine and oxides in the presence of hydroxides and sulfate salts in MIINPs-2 [61][62][63][64][65][66][67][68][69][70][71][72] It should be noted that nitrogen and oxygen bonding with hydrogen, either bending or stretching bands overlap in the ranges 1400-1600 and 3000-3600 cm -1 , respectively [61][62][63][64][65][73][74][75] . So a detailed peak assignment could only be obtained after structure analysis.…”

Section: Characterization Of the Chosen Miinpssupporting

confidence: 90%

preparation and characterization of new nanoparticles compounds based on iron and iodine as prospective materials for medical applications

Aydia¹,

Rahman²,

Rashad

et al. 2021

Arab Journal of Nuclear Sciences and Applications

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Developed compounds of magnetic iron iodide nanoparticles (MIINPs) were simply and cheaply prepared for their potential use in the bioapplications through magnetic hyperthermia therapy, using a co-precipitation method based on the study of various factors such as temperature, molar ratio and pH. Two samples of MIINPs were chosen based on the proportions of iorn and iodide in the sample, respectively 52 and 48% in MIINPs-1 and 45 and 55% in MIINPs-2. Fourier transforms infrared spectroscopy (FTIR), thermal analysis (TA), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) were used to characterize the prepared compounds. The chemical composition of MIINPs-1 and MIINPs-2 was determined by means of an elemental analysis using EDX technique and confirmed using structural modeling by Visual Minteq 3.0, Match 1.9 and Endeavour 1.7 software. The magnetic properties of both samples were measured and found to be superparamagnetic materials. Both MIINPs-1 and MIINPs-2 samples have approximately the same magnetization (nearly 36.1 emu/g) in the 500 Oe coercive field as safe operating limits for MHT achieving 94% and 86.4% of their saturation values respectively. Specific absorption rates (SARs) were practically and theoretically determined as well as it was found that the practical SAR value of MIINPs-1 is much closer to the theoretical value than in the case of MIINPs-2.

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Section: Characterization Of the Chosen Miinpssupporting

confidence: 90%

preparation and characterization of new nanoparticles compounds based on iron and iodine as prospective materials for medical applications

Aydia¹,

Rahman²,

Rashad

et al. 2021

Arab Journal of Nuclear Sciences and Applications

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“…In the case of MIL-101-H50, the FTIR spectra after Er 3+ adsorption showed shifts from 1214 to 1161 cm − 1 to 1178 and 1104 cm − 1 , which can signify the involvement of P-O stretching and PO 2 − groups in complexation with the REE 3+ [33,35]. Furthermore, the presence of new unique peaks at 485 and 483 cm − 1 of the MIL-101-C50 and MIL-101-H50, respectively, can be assigned to the Er-O stretching vibration [30]. These results, together with the pH dependency and the extraction mechanisms [10], suggest that the most likely interaction between the Er 3+ and functionalized MIL-101 can be interpreted as shown in Fig.…”

Section: Adsorption Mechanismmentioning

confidence: 85%

“…Organophosphorus compounds such as TBP, HDEHP and Cyanex-272 (Table S1) are well-known selective acid extractants (Lewis bases) for REEs [26][27][28]. Several studies have reported the possible functionalization of different substrates [29][30][31][32] by organophosphorus extractants. In the study by Shu et al [32], a HDEHP modified silica-based adsorbent demonstrated relatively high adsorption capacities of 39.6 and 51.4 mg g − 1 for Ce 3+ and Gd 3+ , respectively.…”

Section: Introductionmentioning

confidence: 99%

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Kavun

Veen

Repo

2021

Microporous and Mesoporous Materials

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Development of state-of-the-art selective adsorbent materials for recovery of rare earth elements (REEs) is essential for their sustainable usage. In this study, a metal-organic framework (MOF), MIL-101(Cr), was synthesized and post-synthetically modified with optimised loading of the organophosphorus compounds tributyl phosphate (TBP), bis(2-ethylhexyl) hydrogen phosphate (D2EHPA, HDEHP) and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex®-272). The materials were characterized and their adsorption efficiency towards Nd 3+ , Gd 3+ and Er 3+ from aqueous solutions was investigated. The MOF derivatives demonstrated an increase in adsorption capacity for Er 3+ at optimal pH 5.5 in the order of MIL-101-T50 (37.2 mg g − 1 ) < MIL-101-C50 (48.9 mg g − 1 ) < MIL-101-H50 (57.5 mg g − 1 ). The exceptional selectivity of the materials for Er 3+ against transition metal ions was over 90%, and up to 95% in the mixtures with rare earth ions. MIL-101-C50 and MIL-101-H50 demonstrated better chemical stability than MIL-101-T50 over 3 adsorption− desorption cycles. The adsorption mechanism was described by the formation of coordinative complexes between the functional groups of modifiers and Er 3+ ions.

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“…This approach is applied using statistical experimental design, (e.g. response surface methodology, Taguchi) which allows the development of regression models that correlate between the multi variant inputs and the process outcomes either for multi-variant -single objective or multi-variant -multi objective problem based [25,27,[30][31][32][33]. Integrated tools were developed to quantify and assess the uncertainty in RA, an example of these tools is the Quantifying Margin and Uncertainty, which used to support the certification of the reliability and safety for a physical system and quantify the performance thresholds and their margins and the associated uncertainty in their evaluation.…”

Section: Uncertainty Quantificationmentioning

confidence: 99%

Introductory Chapter: Uncertainty Management to Support Pollution Prevention and Control Decisions

Rahman¹,

Hung²

2022

Engineering Problems - Uncertainties, Constraints and Optimization Techniques

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Modification of Mg-Fe hydrotalcite using Cyanex 272 for lanthanides separation

Cited by 26 publications

References 63 publications

preparation and characterization of new nanoparticles compounds based on iron and iodine as prospective materials for medical applications

preparation and characterization of new nanoparticles compounds based on iron and iodine as prospective materials for medical applications

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Introductory Chapter: Uncertainty Management to Support Pollution Prevention and Control Decisions

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