Single and mixed adsorption of Cd(II) and Cr(VI) onto citrate-coated magnetite nanoparticles

Silva-Silva, M.J.; Mijangos–Ricardez, Oscar F.; Vázquez–Hipólito, Virgilio; Vargas, Sergio; López–Luna, Jaime

doi:10.1080/19443994.2014.991756

Cited by 21 publications

(12 citation statements)

References 26 publications

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“…The increase in the peak at 1643 cm −1 was associated with an increase in the water molecules’ amount adsorbed on the particles’ surface. These bonds were in agreement with the analogous modification of Fe 3 O 4 magnetite nanoparticles [ 46 ].…”

Section: Resultssupporting

confidence: 88%

BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

Gadzhimagomedova

Polyakov

Панкин

et al. 2021

IJMS

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X-ray photodynamic therapy (XPDT) has been recently considered as an efficient alternative to conventional radiotherapy of malignant tissues. Nanocomposites for XPDT typically consist of two components—a nanophosphor which re-emits X-rays into visible light that in turn is absorbed by the second component, a photosensitizer, for further generation of reactive oxygen species. In this study, BaGdF5 nanophosphors doped with different Eu:Gd ratios in the range from 0.01 to 0.50 were synthesized by the microwave route. According to transmission electron microscopy (TEM), the average size of nanophosphors was ~12 nm. Furthermore, different coatings with amorphous SiO2 and citrates were systematically studied. Micro-CT imaging demonstrated superior X-ray attenuation and sufficient contrast in the liver and the spleen after intravenous injection of citric acid-coated nanoparticles. In case of the SiO2 surface, post-treatment core–shell morphology was verified via TEM and the possibility of tunable shell size was reported. Nitrogen adsorption/desorption analysis revealed mesoporous SiO2 formation characterized by the slit-shaped type of pores that should be accessible for methylene blue photosensitizer molecules. It was shown that SiO2 coating subsequently facilitates methylene blue conjugation and results in the formation of the BaGdF5: 10% Eu3+@SiO2@MB nanocomposite as a promising candidate for application in XPDT.

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Section: Resultssupporting

confidence: 88%

BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

Gadzhimagomedova

Polyakov

Панкин

et al. 2021

IJMS

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“…In fact, linear regression coefficient values higher than 0.99 firstly suggested the Langmuir model to outstandingly fit the equilibrium adsorption of Cr(VI) and Cd(II) on citrate-coated magnetite NPs. Nonetheless, the nonlinear fitting demonstrated the Langmuir model not to properly describe such data, but it was only gotten with the Freundlich model [51].…”

Section: Linear and Nonlinear Freundlich And Langmuir Isotherm Modelsmentioning

confidence: 98%

“…Thus, for both pHs tested the PFO adsorption rate constants (k 1 ) were negative and of a small order of magnitude, maybe suggesting deprived affinity or repulsion between arsenic solutions and manganese ferrite NPs. For similar findings, the PFO model was discarded for adsorption kinetics of Cd(II) and Cr(VI) onto citrate-coated magnetite NPs [51].…”

Section: Pseudo-first-order (Pfo) Modelmentioning

confidence: 99%

Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles

et al. 2019

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In the present work, we analyzed the linear and nonlinear model suitabilities for adsorption data from aqueous As(III) removal by manganese ferrite nanoparticles (NPs). Hence, As(III) adsorption onto ferrite NPs was formerly analyzed by the intraparticle diffusion model (IPD). Then, adsorption kinetics was described by the pseudo-first-order (PFO), pseudosecond-order (PSO), and Elovich models, while equilibrium adsorption was fitted to the Freundlich and Langmuir isotherms. Linear and nonlinear kinetic and isotherm models were solved and compared. The nonlinear data fitting was applied through the lsqcurvefit user-defined function (Matlab ver. 7.10.0). The initial adsorption rate was influenced by intraparticle diffusion and surface or film diffusion from the arsenic bulk solution to ferrite NPs, according to the IPD model. Adsorption kinetics of As(III) on manganese ferrite NPs was better described by the PSO model, followed by the Elovich model and then the PFO model. Equilibrium adsorption data were only worthily described by the Freundlich isotherm model. While the PSO, Elovich and Freundlich linear models showed even better fit than the nonlinear models, determinant bias was depicted for the PFO and Langmuir linear models. Thus, to use nonlinear adsorption models is highly advisable, having the Matlab lsqcurvefit function been proven very useful to face such task.

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“…Single ion kinetic studies have revealed Cr(VI) to be better adsorbed than Cd 2+ onto citratecoated MNPs. Otherwise Cd 2+ adsorption ratio is improved with Cr(VI) in the binary mixture [322]. In a recent work, a novel "dumbbell-like" magnetic Fe3O4/halloysite nanohybrid (Fe3O4/HNTs@C) with oxygen-containing organic group grafting on the surface of natural halloysite nanotubes (HNTs) and homogeneous Fe3O4 nanospheres selectively aggregating at the tips of modified halloysite nanotubes has been successfully synthesized.…”

Section: Cr(vi) and Cr(iii)mentioning

confidence: 99%

Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature

2017

Journal of Hazardous Materials

308

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Single and mixed adsorption of Cd(II) and Cr(VI) onto citrate-coated magnetite nanoparticles

Cited by 21 publications

References 26 publications

BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

BaGdF5 Nanophosphors Doped with Different Concentrations of Eu3+ for Application in X-ray Photodynamic Therapy

Linear and nonlinear kinetic and isotherm adsorption models for arsenic removal by manganese ferrite nanoparticles

Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature

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