Improvement of zeolite adsorption capacity for cephalexin by coating with magnetic Fe3O4 nanoparticles

Mohseni-Bandpi, Anoushiravan; Al-Musawi, Tariq J.; Ghahramani, Esmail; Zarrabi, Mansur; Mohebi, Samira; Vahed, Shiva Abdollahi

doi:10.1016/j.molliq.2016.02.092

Cited by 153 publications

(52 citation statements)

References 38 publications

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“…7a and b, as time increases from 20 to 120 min, an increase in the efficiency from 20% to 70% results and thereafter it remains unchanged (at a fixed adsorbent dosage (1.5 g L -1 )). The presence of vacant surface sites available for adsorption and the diffusion of the pollutant into the interior surface of the adsorbent have been demonstrated by the some researchers [4,34]. The researchers have stated that after a cer- tain reaction time, because of the repulsive force between the adsorbent and the absorbent, the adsorbent reaches an equilibrium state that makes the remaining available surface sites difficult to occupy.…”

Section: Response Surface Methodsology Modeling and Optimizationmentioning

confidence: 99%

Fabrication of magnetic graphene oxide nanocomposites functionalized with a novel chelating ligand for the removal of Cr(VI): Modeling, optimization, and adsorption studies

Sheikhmohammadi¹,

Mohseni²,

Hashemzadeh³

et al. 2019

Desalination and Water Treatment

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In this study, the performance of magnetic graphene oxide (GO-Fe 3 O 4) functionalized with 2-mercaptobenzothiazole (MBT) chelating ligand was investigated as a new adsorbent for the adsorption of Cr(VI) from aqueous solutions. The magnetic graphene oxide functionalized with chelating ligand of the 2-mercaptobenzothiazole (GFM) was freshly synthesized via a two-stage process, and characterized by energy dispersive X-ray (EDAX), Fourier-transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), scanning electron microscope (SEM) images and thermogravimetric analysis (TGA). The composition effect of independent input factors and one dependent output response was investigated using a central composite design under response surface methodology (RSM). The full second-order model indicated a model well-fitted with the experimental data. The optimum operating points giving maximum Cr(VI) removal (94.02) included pH, 6.79; adsorbent dosage, 2.98 g L-1 ; contact time, 118.6 min; and Cr(VI) concentration, 4.41 mg L-1. Based on the reported results, magnetic graphene oxide functionalized with 2-mercaptobenzothiazole (GFM) chelating ligand indicated best fit with the Langmuir model. The kinetic models followed the pseudo-first-order model. The thermodynamic studies indicated that the sorption of Cr(VI) onto GFM was endothermic and spontaneous.

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Section: Response Surface Methodsology Modeling and Optimizationmentioning

confidence: 99%

Fabrication of magnetic graphene oxide nanocomposites functionalized with a novel chelating ligand for the removal of Cr(VI): Modeling, optimization, and adsorption studies

Sheikhmohammadi¹,

Mohseni²,

Hashemzadeh³

et al. 2019

Desalination and Water Treatment

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“…Concerning the XRD pattern of MNP/CTAB‒EC, it can be observed the loss in the characteristic peaks of FC, especially the ones of the clay minerals. This could be related to the exfoliation towards an amorphous nature or/and to the deposition on the surface of the magnetic nanoparticles of Fe 3 O 4 [ 22 ]. Furthermore, the diffraction peaks detected at 2θ = 30.58°, 35.76°, 43.62°, 57.25° and 63.05° can be associated to (220), (311), (400), (511) and (440) phases, respectively, which confirmed the retention of MNPs’ structure [ 9 , 22 ].…”

Section: Resultsmentioning

confidence: 99%

“…This could be related to the exfoliation towards an amorphous nature or/and to the deposition on the surface of the magnetic nanoparticles of Fe 3 O 4 [ 22 ]. Furthermore, the diffraction peaks detected at 2θ = 30.58°, 35.76°, 43.62°, 57.25° and 63.05° can be associated to (220), (311), (400), (511) and (440) phases, respectively, which confirmed the retention of MNPs’ structure [ 9 , 22 ]. It should be mentioned that the XRD pattern of MNPs (data not presented) showed exactly the same above-mentioned reflections.…”

Section: Resultsmentioning

confidence: 99%

Exfoliated Clay Decorated with Magnetic Iron Nanoparticles for Crystal Violet Adsorption: Modeling and Physicochemical Interpretation

et al. 2020

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Surfactant–modified exfoliated Fayum clay (CTAB–EC) obtained after chemical treatment with a CTAB/H2O2 solution was further decorated with magnetic Fe3O4 nanoparticles (MNP). The final nanocomposite (MNP/CTAB–EC) was characterized by XRD, SEM, FTIR, TEM and its adsorptive capability against a model cationic dye, crystal violet (CV), was evaluated. A comparison of the adsorption performance of the raw clay and its modified counterparts using H2O2, CTAB, CTAB/H2O2 or MNP indicated that the adsorption capacity of MNP/CTAB–EC was the highest for CV removal at pH 8.0. The pseudo‒second order for the kinetics and Freundlich model for adsorption equilibrium fitted well the CV removal experimental data at all tested temperatures (25, 40 and 55 °C). The enhancement of the Langmuir adsorption capacity from 447.1 to 499.4 mg g−1 with increasing the temperature from 25 to 55 °C revealed an endothermic nature of the removal process. The interactions between CV and MNP/CTAB–EC were interpreted using advanced statistical physics models (ASPM) in order to elucidate the adsorption mechanism. Multilayer model fitted the adsorption process and therefore, the steric and energetic factors that impacted the CV adsorption were also interpreted using this model. The aggregated number of CV molecules per MNP/CTAB–EC active site ( n ) was more than unity at all temperatures, representing thus a vertical adsorption orientation and a multi‒interactions mechanism. It was determined that the increase of CV uptake with temperature was mainly controlled by the increase of the number of active sites (NM). Calculated adsorption energies (ΔE) revealed that CV removal was an endothermic and a physisorption process (ΔE < 40 kJ mol −1). MNP/CTAB–EC was magnetically separated, regenerated by NaOH, and reused without significant decrease in its adsorption efficiency, supporting a prosperity of its utilization as an effective adsorbent against hazardous dyes from wastewaters.

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“…The resultant spectrum of FTIR was used before adsorption process of Blue 41 cationic dye to determine vibratory frequency changes in functional groups. According to the chart, it is defined that in the position of most of the bands hasn't been any change which indicates preserving crystalline structure of zeolite after becoming magnetized; in position of 3400-3600 cm -1 in zeolite and composite is related to stretching vibrations of O-H of free hydroxyl, and the position of 3200-3500 cm -1 with peak at 3436 cm -1 in zeolite and composite is related to stretching vibrations of O-H bond in water molecule [28]. The observed peak at bond of 1055 cm -1 is related to vibration of Al-O-Si and the observed peaks at 467 cm -1 , 548 cm -1 , 793 cm -1 is respectively related to expansion structure of Si-O-Si [29].…”

Section: Resultsmentioning

confidence: 99%

Removal of Basic Blue-41 dye from Water by Stabilized Magnetic Iron Nanoparticles on Clinoptilolite Zeolite

Afshin¹,

Rashtbari²,

Vosoughi³

et al. 2020

Rev. Chim.

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In this work, Zeolite/Fe3O4 nanocomposite used for adsorption of Blue 41 cationic dye from aqueous solutions in a wide range of concentrations. Analyzes of FTIR, XRD, FESEM, VSM and XRF have confirmed the nature and the structure of Zeolite/Fe3O4 nanocomposite adsorbent. The obtained results and analyzes determined that adsorption process efficiency increases by increasing reaction time, pH and amount of adsorbent and versus, increasing dye initial concentration causes significant decrease of adsorption efficiency. The obtained results of adsorption of isotherm and kinetics study illustrated that data follows Freundlich model and pseudo second order kinetics. Under optimum conditions of pH = 9, dye initial concentration of 100 mg/L, adsorbent dose of 3 g/L and reaction time of 60 min, removal efficiency was obtained 71.4 %. Totally results showed that Zeolite/Fe3O4 nanocomposite can be used by scrutiny of operating conditions of the adsorption process as a adsorbent with high effectiveness and availability, eco-friendly and cost-effective in order to removing dye from waste water of different industries.

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Improvement of zeolite adsorption capacity for cephalexin by coating with magnetic Fe3O4 nanoparticles

Cited by 153 publications

References 38 publications

Fabrication of magnetic graphene oxide nanocomposites functionalized with a novel chelating ligand for the removal of Cr(VI): Modeling, optimization, and adsorption studies

Fabrication of magnetic graphene oxide nanocomposites functionalized with a novel chelating ligand for the removal of Cr(VI): Modeling, optimization, and adsorption studies

Exfoliated Clay Decorated with Magnetic Iron Nanoparticles for Crystal Violet Adsorption: Modeling and Physicochemical Interpretation

Removal of Basic Blue-41 dye from Water by Stabilized Magnetic Iron Nanoparticles on Clinoptilolite Zeolite

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