Preparation of multi-walled carbon nanotubes coated with CoFe2O4 nanoparticles and their adsorption performance for Bisphenol A compound

Al-Musawi, Tariq J.; Mengelīzadeh, Nezamaddin; Ganji, Fatemeh; Wang, Chongqing; Balarak, Davoud

doi:10.1016/j.apt.2022.103438

Cited by 31 publications

(11 citation statements)

References 51 publications

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“…Because all of the 1/ n values suited by the Freundlich model are smaller than 1, the adsorption happens spontaneously. According to the fitting results of D-R isothermal adsorption model, E is less than 8 kJ/mol, indicating that there is a physical adsorption process in the whole process. , c e q e = 1 q m b + c e q m log ⁡ q e = 1 n ⁡ log ⁡ c e + log ⁡ k f ln ⁡ q e = ln ⁡ q m − β ε 2 The comparison of the adsorption capacity of MgO-SBt with different types of adsorbents reported in other literature is shown in Table . The synchronous maximum adsorption capacity of the adsorbent in this study is significantly higher than that of other adsorbents reported in the literature.…”

Section: Resultsmentioning

confidence: 92%

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Simultaneous Recovery of Nitrogen and Phosphorus from Sewage by Magnesium Ammonium Phosphate Method with Magnesium-Loaded Bentonite

et al. 2022

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Excessive nitrogen (N) and phosphorus (P) result in serious eutrophication of water. In this study, magnesium modified acid bentonite was prepared by the impregnation method, and nitrogen and phosphorus were simultaneously removed by the magnesium ammonium phosphate method (MAP), which solved the problem of the poor adsorption capacity of bentonite. The morphology and structure of MgO-SBt were characterized by XRD, FT-IR, SEM, EDS, XPS, BET, etc. The results show that the acidified bentonite can increase the distance between bentonite layers, the layer spacing is expanded to 1.560 nm, and the specific surface area is expanded to 95.433 m 2 /g. After Mg modification, the characteristic peaks of MgO appear at 2θ of 42.95°, 62.31°, and 78.72°, indicating that MgO has been successfully loaded and that MgO bonded to the surface and interior pores of the acidified bentonite, boosting adsorption performance. When the dosage of MgO-SBt is 0.25 g/L, pH = 9, and N/P ratio is 5:1, the maximum adsorption capacity of MgO-SBt for N and P can reach 193.448 mg/g and 322.581 mg/g. In addition, the mechanism of the simultaneous adsorption of nitrogen and phosphorus by MgO-SBt was deeply characterized by the kinetic model, isothermal adsorption model, and thermodynamic model. The results showed that the simultaneous adsorption of nitrogen and phosphorus by MgO-SBt was chemisorption and a spontaneous exothermic process.

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Section: Resultsmentioning

confidence: 92%

“…According to the fitting results of D-R isothermal adsorption model, E is less than 8 kJ/ mol, indicating that there is a physical adsorption process in the whole process. 49,50…”

Section: ■ Introductionmentioning

confidence: 99%

Simultaneous Recovery of Nitrogen and Phosphorus from Sewage by Magnesium Ammonium Phosphate Method with Magnesium-Loaded Bentonite

et al. 2022

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“…Te next step was to oxidize MWCNTs by refuxing 50% nitric acid at 120 C for 12 hours while stirring. Ten, the fnal product was fltered, washed with double distilled water, and dried overnight in the oven [21,22].…”

Section: Preparation and Oxidation Of Mwcnts Te Mwcntsmentioning

confidence: 99%

“…Moreover, the uncontrolled release of MWCNTs into the aquatic environment could have negative health efects as well as ecological issues. Consequently, the addition of magnetic nanoparticles to MWCNTs will modify them and create a substance that can be isolated from aqueous solutions using a magnetic feld, keeping it out of the environment [18,22].…”

Section: Introductionmentioning

confidence: 99%

Removal of Natural Organic Matter (NOM) from Aqueous Solutions by Multi-Walled Carbon Nanotube Modification with Magnetic Fe3O4 Nanoparticles

Khodabakhshi

Farssani²,

Sedehi

et al. 2023

International Journal of Chemical Engineering

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Backgroundand Aim. Natural organic matter (NOM) has become one of the most serious environmental problems due to its persistence in aqueous solutions and the risk of carcinogenesis. In this study, the removal efficiencies of real and synthetic humic acid (HA) by multi-walled carbon nanotubes (MWCNTs) coated with iron oxide were evaluated. Materials and Methods. The MWCNs were synthesized and coated with iron oxide. In addition, the effects of pH, contact time, mixing speed, and adsorbent dose on the removal efficiency of NOM by MWCNTs-Fe3O4 were studied. Then, the removal efficiency of NOM from real samples was investigated at optimal conditions. The MWCNT-Fe3O4 was characterized by scanning electron microscopy (SEM) test and X-ray diffraction (XRD), respectively. Data analysis was performed using Minitab software based on the Taguchi method. Results. The results showed that MWCNTs were coated with Fe3O4. The SEM test shows particle (MWCNTs-Fe3O4) size in the range of 48–143 nm, and the particles have uniform spherical shapes. Enix software was used to identify the phase in this sample. The conditions including p H = 3 , mixing speed = 120 rpm, adsorbent dosage = 1.5 g·L−1, and contact time = 90 minutes were selected as optimal for NOM adsorption. The mean removal efficiencies of NOM in synthetic samples at 5, 10, and 20 mg·L−1 concentrations were 86.6%, 84.87%, and 95.41%, respectively. In addition, the mean removal efficiency of NOM in Choghakhor Wetland was 77%. Conclusion. Our findings demonstrated that the MWCNTs-Fe3O4 can be potentially used as an adsorbent for removing natural organic matter (HA) from aqueous solutions.

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“…BPA is mainly used in the manufacturing of polycarbonates and epoxy resins. , Also, it is used in thermal papers, can coatings, powder paints, dental fillings, and plastics. , BPA is identified as an endocrine disrupting chemical. To dispose such harmful compounds, advanced oxidation processes such as the Fenton reaction, ozonation, photocatalytic oxidation, and ultrasonic oxidation have been developed to oxidize and dispose of harmful phenolic compounds leading to the generation of hydroxyl radicals [OH • ]. − However, these technologies are time and money consuming and produce toxic byproducts . On the other hand, adsorption , is superior for removal of phenolic compounds due to its fast and convenient screening out of toxic phenolic contaminants, in addition to its low initial costs and trouble-free design …”

Section: Introductionmentioning

confidence: 99%

Cross-Linked Chitosan/Gelatin Beads Loaded with Chlorella vulgaris Microalgae/Zinc Oxide Nanoparticles for Adsorbing Carcinogenic Bisphenol-A Pollutant from Water

et al. 2022

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Water polluted by phenolic compounds is a global threat to health and the environment; accordingly, we prepared a green novel sorbent biological system from a chitosan (CS), gelatin (GT), and Chlorella vulgaris freshwater microalgae (m-Alg) composite impregnated with zinc oxide nanoparticles (ZnO-NPs) for the remediation of bisphenol-A (BPA) from water. C. vulgaris was selected to be one of the constituents of the prepared composite because of its high capability in phytoremediation. The morphology and the structure of CS/GT*m-Alg/ZnO beads were characterized by SEM, FTIR, XRD, and TGA. Different monitoring experimental conditions, such as contact time, pH, BPA concentration, and sorbent dosage, were optimized. The optimum conditions for the adsorption process showed outstanding removal efficiency toward BPA at pH 4.0, contact time 40.0 min, and 40.0 mg L –1 BPA initial concentration. Langmuir, Freundlich, and Temkin isotherm models have been studied for adsorption equilibrium, and the best fit is described by the Langmuir adsorption isotherm. The adsorption kinetics has been studied using pseudo-first-order (PFO), pseudo-second-order (PSO), Elovich, and intraparticle diffusion (IPD) models. The pseudo-second-order kinetic model shows the optimum experimental fit. The monolayer adsorption capacity of the prepared CS/GT*m-Alg/ZnO for BPA was determined to be 38.24 mg g –1 . The prepared CS/GT*m-Alg/ZnO beads show advantageous properties, such as their high surface area, high adsorption capacity, reusability, and cost-effectiveness.

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Preparation of multi-walled carbon nanotubes coated with CoFe2O4 nanoparticles and their adsorption performance for Bisphenol A compound

Cited by 31 publications

References 51 publications

Simultaneous Recovery of Nitrogen and Phosphorus from Sewage by Magnesium Ammonium Phosphate Method with Magnesium-Loaded Bentonite

Simultaneous Recovery of Nitrogen and Phosphorus from Sewage by Magnesium Ammonium Phosphate Method with Magnesium-Loaded Bentonite

Removal of Natural Organic Matter (NOM) from Aqueous Solutions by Multi-Walled Carbon Nanotube Modification with Magnetic Fe3O4 Nanoparticles

Cross-Linked Chitosan/Gelatin Beads Loaded with Chlorella vulgaris Microalgae/Zinc Oxide Nanoparticles for Adsorbing Carcinogenic Bisphenol-A Pollutant from Water

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