Application of graphene oxide modified with 8-hydroxyquinoline for the adsorption of Cr (VI) from wastewater: Optimization, kinetic, thermodynamic and equilibrium studies

Sheikhmohammadi, Amir; Mohseni, Seyed Mohsen; Khodadadi, Rouhollah; Sardar, Mahdieh; Abtahi, Mehrnoosh; Mahdavi, Sakineh; Keramati, Hassan; Dahaghin, Zohreh; Rezaei, Soheila; Almasian, Mohammad; Sarkhosh, Maryam; Faraji, Maryam; Nazari, Shahram

doi:10.1016/j.molliq.2017.02.101

Cited by 72 publications

(24 citation statements)

References 75 publications

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“…The Cr(VI) is widely used in many industrial processes such as metallurgical, refractories (chrome and chrome-magnesite), electroplating and metal finishing, pigment manufacturing, and tannery [2]. Cr(VI) released as a result of leakage, unsuitable storage, and improper disposal practices can have acutely toxic effects for humans (with symptoms such as epigastria, nausea, vomiting, severe diarrhea, internal hemorrhage, dermatitis, and liver and kidney damage) [2][3][4][5]. In an aqueous environment, hexavalent chromium (Cr(VI)), such as chromate [CrO 4 2− , HCrO 4 − ] is a highly mobile and soluble reactive agent (this form has the potential for increased exposure and harm to human health) and can affect biological systems.…”

Section: Introductionmentioning

confidence: 99%

“…Cr(VI) released as a result of leakage, unsuitable storage, and improper disposal practices can have acutely toxic effects for humans (with symptoms such as epigastria, nausea, vomiting, severe diarrhea, internal hemorrhage, dermatitis, and liver and kidney damage) [2][3][4][5]. In an aqueous environment, hexavalent chromium (Cr(VI)), such as chromate [CrO 4 2− , HCrO 4 − ] is a highly mobile and soluble reactive agent (this form has the potential for increased exposure and harm to human health) and can affect biological systems. Cr(III) is not hazardous compared with Cr(VI) due to it slow solubility over a wide pH range, less mobility and much higher stability with respect to redox potential (E h ) [3,4,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…In an aqueous environment, hexavalent chromium (Cr(VI)), such as chromate [CrO 4 2− , HCrO 4 − ] is a highly mobile and soluble reactive agent (this form has the potential for increased exposure and harm to human health) and can affect biological systems. Cr(III) is not hazardous compared with Cr(VI) due to it slow solubility over a wide pH range, less mobility and much higher stability with respect to redox potential (E h ) [3,4,[6][7][8]. Therefore,the decontamination of waters contaminated with Cr(VI) compounds before their release is an important environmental issue.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The activation energy for pseudo-first-order and pseudo-second-order can be calculated from the slope of the line since the slope is equal to ( −Ea 2.303 R ). The calculated values of activation energy of U(VI) and Th(IV) onto HQ-bentonite were found as 13.7 and 17 kJ/mol for uranium and thorium, respectively (Table 3), which are within the activation energy range 0-40 kJ/mol, indicating that the adsorption of U(VI) and Th(IV) onto HQ-bentonite is a physical one [30,32]. Table 3.…”

Section: Sorption Kineticsmentioning

confidence: 79%

“…where C o is the initial concentration of metal ions (mg/L) and b (L/mg) is Langmuir constant related to the free energy of sorption. The value of R L explains the nature of adsorption isotherm to be favorable (0 < R L < 1), unfavorable (R L > 1), linear (R L = 1), or irreversible (R L = 0) [30]. Calculated data reveal that the R L value was found to be 0.039 and 0.0078 for U(VI) and Th(IV) ions, respectively, this indicates that the adsorption of the U(VI) and Th(IV) onto HQ-bentonite is favorable.…”

Section: Langmuir Adsorption Isothermmentioning

confidence: 99%

The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite

2019

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The sorption of uranium and thorium from their aqueous solutions by using 8-hydroxyquinoline modified Na-bentonite (HQ-bentonite) was investigated by the batch technique. Na-bentonite and HQ-bentonite were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier Transform Infrared (FTIR) spectroscopy. Factors that influence the sorption of uranium and thorium onto HQ-bentonite such as solution pH, contact time, initial metal ions concentration, HQ-bentonite mass, and temperature were tested. Sorption experiments were expressed by Freundlich and Langmuir isotherms and the sorption results demonstrated that the sorption of uranium and thorium onto HQ-bentonite correlated better with the Langmuir isotherm than the Freundlich isotherm. Kinetics studies showed that the sorption followed the pseudo-second-order kinetic model. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° indicated that the sorption of uranium and thorium onto HQ-bentonite was endothermic, feasible, spontaneous, and physical in nature. The maximum adsorption capacities of HQ-bentonite were calculated from the Langmuir isotherm at 303 K and were found to be 63.90 and 65.44 for U(VI) and Th(IV) metal ions, respectively.

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Preparation and characterization of deacetylated cellulose acetate/thermoplastic polyurethane nanofiber membranes modified with graphene oxide for methylene blue and Cr (VI) adsorption

Si,

Deng,

Gong

et al. 2023

Polymer Engineering & Sci

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Deacetylated cellulose acetate/thermoplastic polyurethane@graphene oxide (DA/TPU@GO) nanofibrous membranes were prepared through the combination of electrospinning, deacetylation, and ultrasound‐assisted surface treatment techniques. The morphology, wettability, and mechanical properties of composite nanofiber membranes were studied via SEM, TEM, water contact angle measurements, and mechanical tests. Moreover, the adsorption capacity and mechanism of DA/TPU@GO nanofiber membranes for methylene blue and chromium (Cr (VI)) were analyzed. The introduction of active sites from GO led to a significant increase in the adsorption capacity of the DA/TPU@GO composite membranes compared with the DA/TPU composite nanofiber. The composite membrane featured adsorption capacities of 152.7 mg/g (25°C, pH 3) and 122.1 mg/g (25°C, pH 7) for Cr (VI) and methylene blue, respectively, which are higher than most other composite GO‐based adsorbents. The adsorption mechanism of the DA/TPU@GO composite membrane was consistent with the Langmuir isotherm and second‐order kinetic models. Therefore, the DA/TPU@GO composite nanofiber membrane served as an effective adsorbent with broad application prospects in the sewage treatment field owing to its excellent adsorption capacity.Highlights Nanofibers were prepared for the absorption of methylene blue (MB) and Cr (VI). Nanofibers exhibited adsorption capacities of 152.7 and 122.1 mg/g for Cr (VI) and MB. Adsorption mechanism follows Langmuir isotherm and second‐order kinetic models. Nanofibers have wide potential applications in sewage treatment.

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Application of graphene oxide modified with 8-hydroxyquinoline for the adsorption of Cr (VI) from wastewater: Optimization, kinetic, thermodynamic and equilibrium studies

Cited by 72 publications

References 75 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

The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite

Preparation and characterization of deacetylated cellulose acetate/thermoplastic polyurethane nanofiber membranes modified with graphene oxide for methylene blue and Cr (VI) adsorption

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