Probing the hydrophobic mechanism of N-[(3-hydroxyamino)-propoxy]-N-octyl dithiocarbamate toward bastnaesite flotation by in situ AFM, FTIR and XPS

Qi, Jianwei; Liu, Guangyi; Yan, Dong

doi:10.1016/j.jcis.2020.03.080

Cited by 76 publications

(9 citation statements)

References 68 publications

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“…These differences may be mainly due to the interaction between the layers of LDH and interlayer CPT (e. g., hydrogen bonding action) [39,40] . Meanwhile, the N1s signal appeared in the ZnAl‐Eu‐CPT and the binding energies of N 1s at 398.92 and 400.50 eV are attributed to quinoline N and pyrrole N of CPT, respectively, [41‐43] and binding energy at 406.78 eV is due to NO 3 − [44,45] . The binding energy at 284.82 eV of C1s is related to the C−C, C−N, and C=N bonds [43] .…”

Section: Resultsmentioning

confidence: 99%

Eu‐doped ZnAl‐LDH as a Fluorescent Labeling Carrier for the Delivery and Controlled Release of Camptothecin

Qiu

et al. 2022

ChemistrySelect

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Europium doped Zinc‐aluminum layered double hydroxide (Eu‐doped ZnAl‐LDH) as a fluorescent labeling carrier for the delivery and controlled release of camptothecin (CPT) has been studied. X‐ray diffraction (XRD) patterns showed that the basal spacing of the Eu‐doped ZnAl‐LDH intercalated with CPT (2.27 nm) was larger than that of the initial Eu‐doped ZnAl‐LDH (0.88 nm), indicating the successful intercalation of CPT into the Eu‐doped ZnAl‐LDH carrier. X‐ray photoelectron spectroscopy (XPS) suggested that some Eu(III) were reduced to Eu(II) after the intercalation of CPT into the Eu‐doped ZnAl‐LDH. The release of the CPT from drug carrier was carried out in a simulated medium. It was found that the cumulative concentration of the released CPT was exponential with releasing time, and well conformed to the exponential equation: C=A‐Bexp(‐kt). It took 720 minutes (min) for the complete release of CPT from drug carrier. Fluorescent analyses revealed that the fluorescence attributed to the drug delivery system changed from red, blue‐green, to blue emission during delivery and release of CPT, which may be a favorable signal for “detecting” the delivery and release of CPT. Thus, the present Eu‐doped ZnAl‐LDH may be a feasible drug carrier with fluorescent labeling function.

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Section: Resultsmentioning

confidence: 99%

Eu‐doped ZnAl‐LDH as a Fluorescent Labeling Carrier for the Delivery and Controlled Release of Camptothecin

Qiu

et al. 2022

ChemistrySelect

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“…The absence of a separate peak related to the O–N band in the spectrum of bastnäsite + L 4 suggests that two O atoms in the hydroxamate group exist in a uniform chemical environment and have similar electron configurations. According to ref , it is possible that similarity in the local chemical environment can arise from the formation of a five-membered chelate ring (e.g., bidentate −O–Ce–O–N–C– chelation) formed on the surface of the crystal. Furthermore, an additional peak at 529.4 eV was related to O–Ce.…”

Section: Resultsmentioning

confidence: 99%

Improving Rare-Earth Mineral Separation with Insights from Molecular Recognition: Functionalized Hydroxamic Acid Adsorption onto Bastnäsite and Calcite

et al. 2022

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Enhancing the separation of rare-earth elements (REEs) from gangue materials in mined ores requires an understanding of the fundamental interactions driving the adsorption of collector ligands onto mineral interfaces. In this work, we examine five functionalized hydroxamic acid ligands as potential collectors for the REE-containing bastnasite mineral in froth flotation using density functional theory calculations and a suite of surface-sensitive analytical spectroscopies. These include vibrational sum frequency generation, attenuated total reflectance Fourier transform infrared, Raman, and X-ray photoelectron spectroscopies. Differences in the chemical makeup of these ligands on well-defined bastnasite and calcite surfaces allow for a systematic relationship connecting the structure to adsorption activity to be framed in the context of interfacial molecular recognition. We show how the intramolecular hydrogen bonding of adsorbed ligands requires the inclusion of explicit water solvent molecules to correctly map energetic and structural trends measured by experiments. We anticipate that the results and insights from this work will motivate and inform the design of improved flotation collectors for REE ores.

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“…Since known ligands used for separations of bastnäsite are anionic, the mostly carbonate-terminated surface described here suggests that these ligands are likely only sparingly effective on the (001) surface because their mechanism of adsorption is chelation to exposed cation sites. Nevertheless, this specific adsorption to bastnäsite has been extensively demonstrated, especially for hydroxamates. − This shows that some Ce sites are available on the crushed particles, perhaps on other surfaces. Complexation and readsorption of dissolved cations may also play roles in flotation.…”

Section: Discussionmentioning

confidence: 99%

Structure of the Bastnäsite (001) Surface by Crystal Truncation Rod X-ray Diffraction and Ab Initio Molecular Dynamics: Implications for Separations of a Rare Earth Ore Mineral

Wanhala,

Gibson,

Stubbs

et al. 2023

J. Phys. Chem. C

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Bastnasite ((Ce,La)FCO 3 ) is the primary mineral source of light rare earth elements, but its surface structure is not well understood. This presents a major challenge in improving beneficiation strategies. In this work, a synergistic combination of X-ray scattering and ab initio molecular dynamics (AIMD) was used to gain atomistic insight into the interfacial structure of bastnasite. Surface X-ray scattering was used to measure crystal truncation rods (CTRs) of the bastnasite (001) surface, a significant crystal face with a previously unknown termination. The best-fit atomic-scale model of the CTR data features a carbonate layer at the surface, which is stabilized by the relaxation of carbonate groups from their bulk structural positions. AIMD simulations predict similar surface relaxations, which are shown to be influenced by the protonation of oxygen atoms at the surface. Evidence of ordered water at the interface is also observed in the bestfit model and AIMD simulations. The presence of a carbonate layer at this dominant crystal surface is significant for improving separation technologies because most commonly used ligands utilize anionic functional groups to chelate metal cations at particle surfaces. Without modification, anionic ligands are expected to have poor affinity for the carbonate-terminated (001) surface.

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Probing the hydrophobic mechanism of N-[(3-hydroxyamino)-propoxy]-N-octyl dithiocarbamate toward bastnaesite flotation by in situ AFM, FTIR and XPS

Cited by 76 publications

References 68 publications

Eu‐doped ZnAl‐LDH as a Fluorescent Labeling Carrier for the Delivery and Controlled Release of Camptothecin

Eu‐doped ZnAl‐LDH as a Fluorescent Labeling Carrier for the Delivery and Controlled Release of Camptothecin

Improving Rare-Earth Mineral Separation with Insights from Molecular Recognition: Functionalized Hydroxamic Acid Adsorption onto Bastnäsite and Calcite

Structure of the Bastnäsite (001) Surface by Crystal Truncation Rod X-ray Diffraction and Ab Initio Molecular Dynamics: Implications for Separations of a Rare Earth Ore Mineral

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