Functionalized carbon nanotubes for hydrocarbon removal from water

Aljammal, Noor; Abdullah, Thamer Adnan; Juzsakova, Tatjána; Zsirka, Balázs; Creţescu, Igor; Vágvölgyi, Veronika; Sebestyén, Viktor; Cuong, Le Phuoc; Rasheed, Rashed Taleb; Domokos, Endre

doi:10.1016/j.jece.2019.103570

Cited by 40 publications

(16 citation statements)

References 75 publications

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“…After the adsorption process of toluene using PS:MWCNTs:Fe in Figure 4 , the improved peaks at 2925 and 2845 cm −1 are indicative of the C-H stretching mode of the aromatic ring and the C–H stretching in the –CH 3 in toluene, respectively. The FTIR bands appearing at 1035 and 545 cm −1 are attributed to in-plane and out-of-plane C–H bending, respectively [ 23 , 34 , 35 , 36 ]. Table 1 shows the peak assignments and type of vibration for all prepared sorbents [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…X-ray diffraction (XRD) spectra provide information about the structure of MWCNTs, as presented in Figure 5 (the diffraction patterns). In the case of fresh MWCNTs, they show the main peaks at (002), (100), and (101), appearing at 25.9, 43, and 44°, respectively [ 35 , 38 , 39 ]. There is no change in the structure of the MWCNTs after oxidation using strong acids, as can be seen in Figure 5 .…”

Section: Resultsmentioning

confidence: 99%

“…The toluene stock solution was used as a blank without the addition of the nano-sorbent, to ensure that the loss of toluene concentration is not related to the volatility of toluene or the adsorption of toluene on the wall of the conical glass. The toluene removal efficiency and adsorption capacity were calculated using Equations (1) and (2) [ 35 ]: Percentage removal (%) = [(Co − Ct)/Co] × 100 where Co = initial toluene concentration, mg/L, and Ct = final kerosene concentration, mg/L. qt = (Co − Ct)V/W where V = volume of solution, L, W = weight of prepared metal oxides, g, and qt = final adsorption of toluene.…”

Section: Methodsmentioning

confidence: 99%

Section: Adsorption Experimental Workmentioning

confidence: 99%

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Polystyrene-Fe3O4-MWCNTs Nanocomposites for Toluene Removal from Water

et al. 2021

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In this research, multi-walled carbon nanotubes (MWCNTs) were functionalized by oxidation with strong acids HNO3, H2SO4, and H2O2. Then, magnetite/MWCNTs nanocomposites were prepared and polystyrene was added to prepare polystyrene/MWCNTs/magnetite (PS:MWCNTs:Fe) nanocomposites. The magnetic property of the prepared nano-adsorbent PS:MWCNTs:Fe was successfully checked. For characterization, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and BET surface area were used to determine the structure, morphology, chemical nature, functional groups, and surface area with pore volume of the prepared nano-adsorbents. The adsorption procedures were carried out for fresh MWCNTs, oxidized MWCNTs, MWCNTs-Fe, and PS:MWCNTs:Fe nanocomposites in batch experiments. Toluene standard was used to develop the calibration curve. The results of toluene adsorption experiments exhibited that the PS:MWCNTs:Fe nonabsorbent achieved the highest removal efficiency and adsorption capacity of toluene removal. The optimum parameters for toluene removal from water were found to be 60 min, 2 mg nano-sorbent dose, pH of 5, solution temperature of 35 °C at 50 mL volume, toluene concentration of 50 mg/L, and shaking speed of 240 rpm. The adsorption kinetic study of toluene followed the pseudo-second-order kinetics, with the best correlation (R2) value of 0.998, while the equilibrium adsorption study showed that the Langmuir isotherm was obeyed, which suggested that the adsorption is a monolayer and homogenous.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Adsorption Experimental Workmentioning

confidence: 99%

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Polystyrene-Fe3O4-MWCNTs Nanocomposites for Toluene Removal from Water

et al. 2021

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“…Dispersion and dissolution of all CNT forms in aqueous solution, water, most organic, and aqueous solvents are hard to achieve because of CNT chemical nature. To overcome these problems, extensive research has been done in order to enhance chemical properties of CNT [39,93]. CNT surface functionalization can be performed by covalent and noncovalent (van der Waals bonds); this strategy depends on the linkage between CNTs and functional molecules [93].…”

Section: Modification Strategies and Functionalization Of Cntsmentioning

confidence: 99%

Carbon Nanotubes (CNTs) from Synthesis to Functionalized (CNTs) Using Conventional and New Chemical Approaches

Salah

Ouslimani

Bousba

et al. 2021

Journal of Nanomaterials

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Carbon nanotubes (CNTs) have emerged worldwide because of their remarkable properties enlarging their field of applications. Functionalization of CNTs is a convenient strategy to tackle low dispersion and solubilization of CNTs in many solvents or polymers. It can be done by covalent or noncovalent surface functionalization that is briefly discussed regarding the current literature. Endohedral and exohedral are conventional methods based on covalent and van der Waals bonding forces that are created through CNT functionalization by various materials. In this paper, a review of new approaches and mechanisms of functionalization of CNTs is proposed, including amidation, fluorination, bromination, chlorination, hydrogenation, and electrophilic addition. Our analysis is supported by several characterization methods highlighting recent improvements hence extending the range of applicability of CNTs.

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Amino‐functionalized carbon nanotubes for effectively improving the mechanical properties of pre‐impregnated epoxy resin/carbon fiber

Santos

Oliveira

Rodrigues

et al. 2021

J of Applied Polymer Sci

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Pre-impregnated carbon fiber/epoxy resin (CF/epoxy prepreg) gained its popularity for significant stress applications, especially in the aerospace industry, owing to its excellent resistance and low specific mass. However, these CF/epoxy prepregs have a tendency to crack propagation. A solution for the prepregs fragility is the addition of carbon nanotubes (CNTs), especially those functionalized with amino groups, reinforcing the material due to its exceptional mechanical properties. In this work, the influence of the carbon chain length of two different amino-functionalized CNTs from diverse backgrounds (commercial and laboratory growth CNTs) is studied. The nanofillers were added in CF/epoxy prepregs by dry spraying without solvent aid. CNTs' samples were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, transmission electron microscopy, and thermogravimetric analysis (TGA), while the composites were analyzed by TGA, dynamic-mechanical analysis, and field emission scanning electron microscopy. The various surface treatment occurred at different levels according to the CNTs background, and all samples exhibited a distinct behavior. These differences were also observed in the composites' thermomechanical performance: CNTs functionalized with larger carbon chain amine presented the best results, with an increase of almost 100% in the storage moduli (E'), confirming the efficiency of aminofunctionalized CNTs in the reinforcement of CF/epoxy prepregs.

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Functionalized carbon nanotubes for hydrocarbon removal from water

Cited by 40 publications

References 75 publications

Polystyrene-Fe3O4-MWCNTs Nanocomposites for Toluene Removal from Water

Polystyrene-Fe3O4-MWCNTs Nanocomposites for Toluene Removal from Water

Carbon Nanotubes (CNTs) from Synthesis to Functionalized (CNTs) Using Conventional and New Chemical Approaches

Amino‐functionalized carbon nanotubes for effectively improving the mechanical properties of pre‐impregnated epoxy resin/carbon fiber

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