Studies on the nature of salicyl hydroxamate adsorption at the surface of neodymium oxide

Sime, Marc F; Das, Avimanyu; Galt, Greer; Hope, Gregory Alan; Young, Clyde T.

doi:10.1080/01932691.2018.1544079

Cited by 7 publications

(5 citation statements)

References 27 publications

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“…Neodymium(III) oxide (Nd 2 O 3 ) nanoparticles are widely used as coloring agents for ceramics and glasses, catalysts, raw materials of the neodymium alloy and neodymium metal, and also as dopants for high-efficiency solid-state lasers due to their unique thermal and physicochemical properties [36,37]. However, there is no special mention of the possible use of Nd 2 O 3 nanoparticles as materials for dye adsorption.…”

Section: Introductionmentioning

confidence: 99%

Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents

et al. 2020

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In the current work, neodymium oxide (Nd2O3) nanoparticles were synthesized and characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The major aim/investigation of this research was to fit/model and optimize the removal of Acid Blue 92 (AB92) dye from synthetic effluents (aqueous solutions) using the adsorption process based on neodymium oxide (Nd2O3) nanoparticles. To optimize the adsorption conditions, central composite design (CCD) based on response surface methodology (RSM) was applied. The effects of pH (3–9), adsorbent dosage (0.1–1 g/L), initial concentration of AB92 (100–300 mg/L), and contact time (10–100 min) on the adsorption process were investigated. Apart from equilibrium and kinetic experiments, thermodynamic evaluation of the adsorption process was also undertaken. The adsorption process was found to have the best fitting to Langmuir isotherm model and pseudo-second-order kinetic equation. Also, the process was found to be spontaneous and favorable with increased temperature. The optimal conditions found were: pH = 3.15, AB92 concentration equal to 138.5 mg/L, dosage of nanoadsorbent equal to 0.83 g/L, and 50 min as contact time, which resulted in 90.70% AB92 removal. High values for the coefficient of determination, R2 (0.9596) and adjusted R2 (0.9220) indicated that the removal of AB92 dye using adsorption can be explained and modeled by RSM. The Fisher’s F-value (25.4683) denotes that the developed model was significant for AB92 adsorption at a 95% confidence level.

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Section: Introductionmentioning

confidence: 99%

Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents

et al. 2020

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“…They concluded that even more selective collectors were needed [10] . Hence, collectors, such as salicylhydroxamic acid (SHA), have recently been examined [11][12][13][14] . It was collectively concluded from these studies that LC and CN played critical roles [2,4] .…”

Section: Flotationmentioning

confidence: 99%

“…chemisorbed or surface precipitated collector or a combination of the two. A mechanism has been presented along these lines [2,4,[11][12][13][14] and is the subject of continuing investigations [15,16] .…”

Section: Collector Group Elementsmentioning

confidence: 99%

Synthesis and characterization of hydroxamic acid N,3-dihydroxy-2-naphthamide and its copper (II) complex per keto/enol forms and rare earth flotation

Suslavich,

LaDouceur,

Mamudu

et al. 2024

Miner Miner Mater

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Flotation is the most common beneficiation process used for separating minerals, but for rare earth minerals (REMs), performance can suffer due to the dilute nature of the rare earth elements. Furthermore, the REMs tend to possess smaller grain sizes, making the use of traditional flotation cells difficult if total liberation is needed. Consequently, improved efficiencies are needed for extracting REMs from various sources. For these systems, hydroxamic acids are commonly used as flotation collectors. Two such hydroxamic collectors were studied in this work: salicylhydroxamic acid (SHA) and N,3-dihydroxy-2-naphthamide (H2O5). Because there is no documented synthesis route for H2O5, several synthesis approaches were examined. Furthermore, because there is no information on H2O5, important structural and characteristic data was gathered regarding its (1) preferred structural isomer as a Cu2+ complex and (2) electrostatic potential values of the possible dentate groups in different tautomeric forms, thereby allowing H2O5 to be compared to SHA, particularly regarding flotation behavior. Hydrogen nuclear magnetic resonance (H-NMR), Laser Raman Spectroscopy (LRS), and predominantly Fourier-Transform Infrared (FT-IR) spectroscopy showed that both SHA and H2O5 preferred to be keto tautomers when uncomplexed; however, once chelated to Cu2+ ions, the collectors adopted enol forms. Molecular modeling using Spartan software showed an increase in the electrostatic potential of the possible dentate groups in both molecules for the enol form. H2O5 also resulted in an increased recovery by flotation of REMs of about 23% compared to SHA at similar reagent dosages.

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“…This type of adsorption was proposed when hydroxamate concentration was low and monolayer adsorption predominated. Meanwhile, surface reactions-combinations of chemisorption and multilayer physisorption-are dominant at high concentrations of hydroxamate and involve (i) hydrolysis of metal atoms, (ii) formation of hydroxyl-complexes, and (iii) re-adsorption to or precipitation on the mineral surface [34,65,68].…”

Section: Hydroxamate Collectorsmentioning

confidence: 99%

Rare Earth Elements Recovery from Primary and Secondary Resources Using Flotation: A Systematic Review

et al. 2023

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Rare earth minerals (REMs) contain rare earth elements (REEs) that are important in modern technologies due to their unique magnetic, phosphorescent, and catalytic properties. However, REMs are not only non-renewable resources but also non-uniformly distributed on the Earth’s crust, so the processing of REE-bearing secondary resources via recycling is one potential route to ensure the long-term sustainability of REE supply. Flotation—a method that separates materials based on differences in their surface wettability—is a process applied for both mineral processing and recycling of REEs, especially when the particles are fine and/or a high-purity product is required. In this review, studies about rare earth flotation from 2012 to 2021 were systematically reviewed using the PRISMA guideline. It was found that most REM flotation research works focused on finding better collectors and depressants while, for recycling, studies on advanced flotation techniques like froth flotation, ion flotation, solvent sublation, electroflotation, and adsorbing colloid flotation with an emphasis on the recovery of dissolved REEs from aqueous solutions dominated.

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Studies on the nature of salicyl hydroxamate adsorption at the surface of neodymium oxide

Cited by 7 publications

References 27 publications

Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents

Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents

Synthesis and characterization of hydroxamic acid N,3-dihydroxy-2-naphthamide and its copper (II) complex per keto/enol forms and rare earth flotation

Rare Earth Elements Recovery from Primary and Secondary Resources Using Flotation: A Systematic Review

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