Removal of diazo dye Direct Red 23 from aqueous solution using zero-valent iron nanoparticles immobilized on multi-walled carbon nanotubes

Sohrabi, Mahmoud Reza; Mansouriieh, Nafiseh; Khosravi, Morteza; Zolghadr, Mohsen

doi:10.2166/wst.2015.106

Cited by 20 publications

(5 citation statements)

References 35 publications

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“…Therefore, the natural acidity of each dye solution (pH 8.0 for CR solution and pH 9.0 for DR 23 solution respectively) was selected to perform the following adsorption study, which was more convenient for practical operation. The results show that the Fe 3 O 4 @SA-Fe polymer with ultra-high adsorption capacity, nearly 100% dye removal efficiency and wide pH application range has greater advantages than the adsorption materials reported in references [38,39], and can realize the rapid separation and recovery from liquid phase.…”

Section: Effect Of Important Adsorption Factorsmentioning

confidence: 88%

Preparation of Novel Magnetic Sodium Alginate-Ferric(III) Gel Beads and Their Super-Efficient Removal of Direct Dyes from Water

2020

J Polym Environ

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Novel magnetic sodium alginate-based biopolymer Fe 3 O 4 @SA-Fe was successfully prepared by the cross-linking reaction of sodium alginate (SA) and Fe(III) ions and adding magnetic ferric oxide (Fe 3 O 4 ), and characterized by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), Fourier Transform-Infrared (FTIR), X-ray Photoelectron Spectroscopy (XPS) and Vibrating Sample Magnetometer (VSM), respectively. The effects of preparation and adsorption conditions on the adsorbent were investigated by adsorbing Congo red (CR) and Direct red 23 (DR 23) dyes. The results showed that the synthesized Fe 3 O 4 @SA-Fe polymer gel beads exhibited super-high adsorption property and good stability when the mass concentrations of SA, Fe(III) ions and Fe 3 O 4 are 16, 12.5 and 7 g/L at room temperature respectively. The adsorption rates of two dyes by Fe 3 O 4 @SA-Fe were very fast at 298 K, and the time required to reach the equilibrium was very short, which was 30 min for CR and 60 min for DR 23. Moreover, the dye removal efficiencies were over 99.4% and 95.2% in a wide pH range of 2.0 ~ 9.0 for CR and 2.0 ~ 10.0 for DR 23, respectively. The adsorption process could be accurately described by the pseudo-second-order rate model, which were mostly controlled by intra-particle diffusion. The fitting results of isothermic data by Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models revealed that the equilibrium data completely obeyed the Langmuir model and the obtained maximum adsorption capacities of CR and DR 23 were 3333 and 1429 mg/g at 298 K, respectively. FTIR, UV-Vis and XPS analysis indicated that the electrostatic adsorption, hydrogen bonding and ligand exchange promoted the interaction between dye molecules and Fe 3 O 4 @SA-Fe. A green magnetic biosorbent Fe 3 O 4 @SA-Fe gel beads with simple preparation method and high-cost performance can be used for super-efficient purification of high-concentration dye effluent and quickly separated from the aqueous phase and recovered, which would have a good application prospect.

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Section: Effect Of Important Adsorption Factorsmentioning

confidence: 88%

Preparation of Novel Magnetic Sodium Alginate-Ferric(III) Gel Beads and Their Super-Efficient Removal of Direct Dyes from Water

2020

J Polym Environ

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“…Coded independent factors are shown using X i and X j . Also, « and k show the error and the number of model variables (Sohrabi et al, 2015).…”

Section: Design Of Experimentsmentioning

confidence: 99%

Removal of reactive orange 16 with nZVI-activated carbon/Ni: optimization by Box-Behnken design and performance prediction using artificial neural networks

Seyedi

Sohrabi

Motiee

et al. 2021

PRT

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Purpose The purpose of this paper is to analyze nano zero-valent iron (nZVI)-activated carbon/Nickel (nZVI-AC/Ni) by a novel method. The synthesized adsorbent was used to degrade reactive orange 16 (RO 16) azo dye. Design/methodology/approach The optimum conditions for the highest removal of RO 16 dye were determined. Characterization of nZVI-AC/Ni was done by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy. The nZVI-AC/Ni were used for the removal of dye RO 16 and the parameters affecting were discussed such as pH, adsorbent dosage, contact time and concentration of dye. To investigate the variables and interaction between them, an analysis of variance test was performed. Findings The characterization results show that the synthesis of nZVI-AC/Ni caused no aggregation of nanoparticles. The maximum dye removal efficiency of 99.45% occurred at pH 4, the adsorbent dosage = 0.1 gL-1 and the dye concentration of 10 mgL-1. Among various algorithms of feed-forward backpropagation neural network, Levenberg–Marquardt with mean square error (MSE) = 9.86 × 10–22 in layer = 5 and the number of neurons = 9 was selected as the best algorithm. On the other hand, the MSE of the radial basis function model was 0.2159 indicating the good ability of the model to predict the percentage of dye removal. Originality/value There are two main innovations. One is that the novel nZVI-AC/Ni was prepared successfully. The other is that the optimized conditions were obtained for the removal of RO 16 dye from an aqueous solution. Furthermore, to the best of the knowledge, no study has ever investigated the removal of RO 16 by nZVI-AC/Ni produced.

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“…Therefore, columbic or electrostatic interactions do not favor the sorption of PFF ). However, hydroxide precipitation formed gradually when the solution pH was high; this blanketed the Fe/Ni shell and decreased PFF adsorption (Sohrabi et al 2015). Thus, the change in pH can influence the adsorption of PFF molecules on to the Fe/Ni nanocomposite surface.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

“…These nanoparticles have been used for remediation of organic contaminants such as halogenated organics (Xu et al 2014) and dyes (Sohrabi et al 2015;Zhang et al 2011). The nZVI particles tend to react with surrounding media or agglomerate into larger particles in response to its high surface energy and intrinsic magnetic interaction, which results in significant loss of reactivity (Phenrat et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Adsorption kinetics and thermodynamics of organophosphorus profenofos pesticide onto Fe/Ni bimetallic nanoparticles

Mansouriieh

Sohrabi

Khosravi

2016

Int. J. Environ. Sci. Technol.

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Bimetallic Fe/Ni nanoparticles were synthesized and used for the removal of profenofos organophosphorus pesticide from aqueous solution. These novel bimetallic nanoparticles (Fe/Ni) were characterized by scanning electron microscopy, energy-dispersive X-ray analysis spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The effect of the parameters of initial pesticide concentration, pH of the solution, adsorbent dosage, temperature, and contact time on adsorption was investigated. The adsorbent exhibited high efficiency for profenofos adsorption, and equilibrium was achieved in 8 min. The Langmuir, Freundlich, and Temkin isotherm models were used to determine equilibrium. The Langmuir model showed the best fit with the experimental data (R 2 = 0.9988). Pseudo-first-order, pseudo-second-order, and intra-particle diffusion models were tested to determine absorption kinetics. The pseudo-second-order model provided the best correlation with the results (R 2 = 0.99936). The changes in the thermodynamic parameters of Gibb's free energy, enthalpy, and entropy of the adsorption process were also evaluated. Thermodynamic parameters indicate that profenofos adsorption using Fe/Ni nanoparticles is a spontaneous and endothermic process. The value of the activation energy (E a = 109.57 kJ/mol) confirms the nature of the chemisorption of profenofos onto Fe/Ni adsorbent.

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Removal of diazo dye Direct Red 23 from aqueous solution using zero-valent iron nanoparticles immobilized on multi-walled carbon nanotubes

Cited by 20 publications

References 35 publications

Preparation of Novel Magnetic Sodium Alginate-Ferric(III) Gel Beads and Their Super-Efficient Removal of Direct Dyes from Water

Preparation of Novel Magnetic Sodium Alginate-Ferric(III) Gel Beads and Their Super-Efficient Removal of Direct Dyes from Water

Removal of reactive orange 16 with nZVI-activated carbon/Ni: optimization by Box-Behnken design and performance prediction using artificial neural networks

Adsorption kinetics and thermodynamics of organophosphorus profenofos pesticide onto Fe/Ni bimetallic nanoparticles

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