Recovery of gold(III) and iridium(IV) using magnetic layered double hydroxide (Fe3O4/Mg-Al-LDH) nanocomposite: Equilibrium studies and application to real samples

Biata, N. Raphael; Jakavula, Silindokuhle; Mashile, Geaneth Pertunia; Nqombolo, Azile; Moutloali, Richard M.; Nomngongo, Philiswa N.

doi:10.1016/j.hydromet.2020.105447

Cited by 32 publications

(13 citation statements)

References 48 publications

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“…As shown in the Pareto charts, examined factors and their interaction were insignificant for the adsorption of Lev by the MnFe 2 O 3 /GO core–shell nanocomposite, as the bars did not cross the 95% confidence limit, except for the adsorbent dosage. 44 Moreover, the smaller the dosage of the adsorbent, the higher the adsorption capacity. It can be seen in Figure S1 that the increase in the experimental stirring rate increases the adsorption capacity of Lev.…”

Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

et al. 2022

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This study describes for the first time the synthesis, characterization, and application of a MnFe 2 O 3 /GO core–shell nanocomposite as an adsorbent for the removal of levofloxacin (Lev) from real water samples. The formation of the proposed nanocomposite was confirmed using various characterization techniques. The structural techniques revealed a 20 nm average particle size of the MnFe 2 O 3 /GO core–shell nanocomposite, with a surface area of 70.7 m 2 g –1 , as shown by the BET results. The most influential parameters (adsorbent dosage, stirring rate, and Lev pH) that affected the adsorption process were optimized using the response surface methodology (RSM) based on a central composite design. The optimum conditions were 0.007 g, 2, and 7 for adsorbent dosage, stirring rate, and Lev pH, respectively. The adsorption behavior of Lev on the MnFe 2 O 3 /GO core–shell nanocomposite was examined using isotherm models, kinetics, and thermodynamics. The kinetic models demonstrated that the adsorption process was controlled by both intraparticle and outer diffusion. Furthermore, the results obtained revealed that the adsorption of Lev on MnFe 2 O 3 /GO was dominated by electrostatic interactions. Moreover, Dubinin-Radushkevich and Temkin isotherms confirmed that the sorption mechanism was dominated by electrostatic interactions, while Langmuir and Sips models confirmed a monolayer adsorption process. The maximum adsorption capacity of Lev onto the MnFe 2 O 3 /GO adsorbent was found to be 129.9 mg g –1 . Furthermore, the thermodynamic data revealed that the adsorption system was spontaneous and exothermic. The synthesized MnFe 2 O 3 /GO core–shell nanocomposite showed significant recyclability and regenerability properties up to five adsorption–desorption cycles. As a proof of concept, the performance of the prepared adsorbent was evaluated for laboratory-scale purification of spiked real water samples. The prepared adsorbent significantly reduced the concentration of Lev in the real water samples and the removal efficiency ranged from 86 to 97%.

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Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

et al. 2022

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“…The PZC of material was found to be 6.9 ( Figure S1 ), this means that at pH lower than 6.9, the adsorbent’s surface is positively charged, while at higher pH (i.e., >6.9) the surface of the adsorbent anionic [ 56 ]. The optimum pH used for the adsorption was found to be 7, which is greater than the adsorbent’s PZC, thus suggesting that at optimum pH the adsorbent was anionic.…”

Section: Resultsmentioning

confidence: 99%

Adsorptive Removal of Cd, Cu, Ni and Mn from Environmental Samples Using Fe3O4-Zro2@APS Nanocomposite: Kinetic and Equilibrium Isotherm Studies

et al. 2021

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In this study, Fe3O4-ZrO2 functionalized with 3-aminopropyltriethoxysilane (Fe3O4-ZrO2@APS) nanocomposite was investigated as a nanoadsorbent for the removal of Cd(II), Cu(II), Mn (II) and Ni(II) ions from aqueous solution and real samples in batch mode systems. The prepared magnetic nanomaterials were characterized using X-ray powder diffraction (XRD), scanning electron microscopy/energy dispersion x-ray (SEM/EDX) Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Factors (such as adsorbent dose and sample pH) affecting the adsorption behavior of the removal process were studied using the response surface methodology. Under optimized condition, equilibrium data obtained were fitted into the Langmuir and Freundlich isotherms and the data fitted well with Langmuir isotherms. Langmuir adsorption capacities (mg/g) were found to be 113, 111, 128, and 123 mg/g for Cd, Cu, Ni and Mn, respectively. In addition, the adsorption kinetics was analyzed using five kinetic models, pseudo-first order, pseudo-second order, intraparticle diffusion and Boyd models. The adsorbent was successfully applied for removal of Cd(II), Cu(II), Mn (II) and Ni(II) ions in wastewater samples.

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“…There are many spent magnetic nanoadsorbent regeneration methods among which the chemical method appears to be popular (Meng et al 2018 ; Campos et al 2019 ; Gagliano et al 2020 ; Sahoo et al 2020 ; Bakhshi Nejad and Mohammadi 2020 ; Biata et al 2020 ; Jain et al 2021 ; Peralta et al 2021 ). Other adsorbent regeneration methods are thermal (Aguedal et al 2019 ), supercritical extraction (Momina et al 2018 ), microbial regeneration (Momina et al 2018 ), solvent extraction (Dutta et al 2019 ), and microwave and ultraviolet irradiation (Sun et al 2017 ).…”

Section: Developments With Magnetic Nanoadsorbents and Magnetic Separationmentioning

confidence: 99%

Magnetic nanoadsorbents for micropollutant removal in real water treatment: a review

Mudhoo

Sillanpää

2021

Environ Chem Lett

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Pure water will become a golden resource in the context of the rising pollution, climate change and the recycling economy, calling for advanced purification methods such as the use of nanostructured adsorbents. However, coming up with an ideal nanoadsorbent for micropollutant removal is a real challenge because nanoadsorbents, which demonstrate very good performances at laboratory scale, do not necessarily have suitable properties in in full-scale water purification and wastewater treatment systems. Here, magnetic nanoadsorbents appear promising because they can be easily separated from the slurry phase into a denser sludge phase by applying a magnetic field. Yet, there are only few examples of large-scale use of magnetic adsorbents for water purification and wastewater treatment. Here, we review magnetic nanoadsorbents for the removal of micropollutants, and we explain the integration of magnetic separation in the existing treatment plants. We found that the use of magnetic nanoadsorbents is an effective option in water treatment, but lacks maturity in full-scale water treatment facilities. The concentrations of magnetic nanoadsorbents in final effluents can be controlled by using magnetic separation, thus minimizing the ecotoxicicological impact. Academia and the water industry should better collaborate to integrate magnetic separation in full-scale water purification and wastewater treatment plants.

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Recovery of gold(III) and iridium(IV) using magnetic layered double hydroxide (Fe3O4/Mg-Al-LDH) nanocomposite: Equilibrium studies and application to real samples

Cited by 32 publications

References 48 publications

One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

Adsorptive Removal of Cd, Cu, Ni and Mn from Environmental Samples Using Fe3O4-Zro2@APS Nanocomposite: Kinetic and Equilibrium Isotherm Studies

Magnetic nanoadsorbents for micropollutant removal in real water treatment: a review

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Recovery of gold(III) and iridium(IV) using magnetic layered double hydroxide (Fe3O4/Mg-Al-LDH) nanocomposite: Equilibrium studies and application to real samples

Cited by 32 publications

References 48 publications

One-Step Synthesis of a Mn-Doped Fe2O3/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

One-Step Synthesis of a Mn-Doped Fe2O3/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

Adsorptive Removal of Cd, Cu, Ni and Mn from Environmental Samples Using Fe3O4-Zro2@APS Nanocomposite: Kinetic and Equilibrium Isotherm Studies

Magnetic nanoadsorbents for micropollutant removal in real water treatment: a review

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One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution

One-Step Synthesis of a Mn-Doped Fe₂O₃/GO Core–Shell Nanocomposite and Its Application for the Adsorption of Levofloxacin in Aqueous Solution