Production and functionalization of carbon nanotubes for application in membrane synthesis for natural gas separation

Aberefa, Oluseyi; Daramola, Michael O.; Iyuke, Sunny E.

doi:10.1016/j.micromeso.2018.12.040

Cited by 10 publications

(5 citation statements)

References 55 publications

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“…The XRD pattern in Figure 2 shows that sodalite was successfully formed as all the required peaks appear. This pattern was identified by the DIFFRAC EVA software as silica sodalite, dehydrated with a chemical formula (C 2 H 7 NO)(Si 6 O 12 ), similar SSOD patterns have been obtained in the literature [21,29,30]. However, the diffraction intensities increased, confirming the modification with additional functional groups [34].…”

Section: Nanoparticles Characterizationsupporting

confidence: 80%

“…The 3.54% weight loss above 100 °C in fSSOD is associated with the decomposition of the -COOH functional group [ 36 , 37 ]. The increased weight loss for fSSOD is a confirmation of the presence of additional functional groups [ 30 ]. These observations are also reported in the literature [ 28 , 30 ].…”

Section: Resultsmentioning

confidence: 99%

“…The increased weight loss for fSSOD is a confirmation of the presence of additional functional groups [ 30 ]. These observations are also reported in the literature [ 28 , 30 ]. These results show that the as-produced nanoparticles are stable at higher temperatures as there is very little weight loss.…”

Section: Resultsmentioning

confidence: 99%

“…The surface of the synthesized SSOD nanoparticles was functionalized using carboxylation protocol reported elsewhere [ 30 ] in order to enhance their dispersion in the polymer matrix. An amount of 1 g of SSOD was dispersed in a mixture of 75 mL H 2 SO 4 (97%) and 25 mL HNO 3 (38%) and stirred overnight at 40 °C to obtain fSSOD.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Silica Sodalite Functionalization and PVA Coating on Performance of Sodalite Infused PSF Membrane during Treatment of Acid Mine Drainage

2021

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In this study, silica sodalite (SSOD) nanoparticles were synthesized by topotactic conversion and functionalized using HNO3/H2SO4 (1:3). The SSOD and functionalized SSOD (fSSOD) nanoparticles were infused into a Polysulfone (Psf) membrane to produce mixed matrix membranes. The membranes were fabricated via the phase inversion method. The membranes and the nanoparticles were characterized using Scanning Electron Microscopy (SEM) to check the morphology of the nanoparticles and the membranes and Fourier Transform Infrared to check the surface chemistry of the nanoparticles and the membranes. Thermal stability of the nanoparticles and the membranes was evaluated using Themogravimetry analysis (TGA) and the degree of hydrophilicity of the membranes was checked via contact angle measurements. The mechanical strength of the membranes and their surface nature (roughness) were checked using a nanotensile instrument and Atomic Force Microscopy (AFM), respectively. The textural property of the nanoparticles were checked by conducting N2 physisorption experiments on the nanoparticles at 77 K. AMD-treatment performance of the fabricated membranes was evaluated in a dead-end filtration cell using a synthetic acid mine drainage (AMD) solution prepared by dissolving a known amount of MgCl2, MnCl2·4H2O, Na2SO4, Al(NO3)3, Fe(NO3)3·9H2O, and Ca2OH2 in deionized water. Results from the N2 physisorption experiments on the nanoparticles at 77 K showed a reduction in surface area and increase in pore diameter of the nanoparticles after functionalization. Performance of the membranes during AMD treatment shows that, at 4 bar, a 10% fSSOD/Psf membrane displayed improved heavy metal rejection >50% for all heavy metals considered, expect the SSOD-loaded membrane that showed a rejection <13% (except for Al3+ 89%). In addition, coating the membranes with a PVA layer improved the antifouling property of the membranes. The effects of multiple PVA coating and behaviour of the membranes during real AMD are not reported in this study, these should be investigated in a future study. Therefore, the newly developed functionalized SSOD infused Psf membranes could find applications in the treatment of AMD or for the removal of heavy metals from wastewater.

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Section: Nanoparticles Characterizationsupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effect of Silica Sodalite Functionalization and PVA Coating on Performance of Sodalite Infused PSF Membrane during Treatment of Acid Mine Drainage

2021

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“…The main obstacle is formation of entangled CNT three-dimensional networks built-up by means of van der Waals forces [3]. To fully exploit extraordinary properties of CNTs such as high tensile strength and stiffness [4,5], ballistic electroconductivity [6], high thermal conductivity [7], or tailorable optical properties, ‘debundling’ of CNT agglomerates should be the first and essential step [8,9,10]. Covalent modifications as more stable than adsorption tailor CNTs for the application-oriented post-modifications [11,12].…”

Section: Introductionmentioning

confidence: 99%

Ullmann Reactions of Carbon Nanotubes—Advantageous and Unexplored Functionalization toward Tunable Surface Chemistry

et al. 2019

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We demonstrate Ullmann-type reactions as novel and advantageous functionalization of carbon nanotubes (CNTs) toward tunable surface chemistry. The functionalization routes comprise O-, N-, and C-arylation of chlorinated CNTs. We confirm the versatility and efficiency of the reaction allowing functionalization degrees up to 3.5 mmol g−1 by applying both various nanotube substrates, i.e., single-wall (SWCNTs) and multi-wall CNTs (MWCNTs) of various chirality, geometry, and morphology as well as diverse Ullmann-type reagents: phenol, aniline, and iodobenzene. The reactivity of nanotubes was correlatable with the nanotube diameter and morphology revealing SWCNTs as the most reactive representatives. We have determined the optimized conditions of this two-step synthetic protocol as: (1) chlorination using iodine trichloride (ICl3), and (2) Ullmann-type reaction in the presence of: copper(I) iodide (CuI), 1,10-phenanthroline as chelating agent and caesium carbonate (Cs2CO3) as base. We have analyzed functionalized CNTs using a variety of techniques, i.e., scanning and transmission electron microscopy, energy dispersive spectroscopy, thermogravimetry, comprehensive Raman spectroscopy, and X-ray photoelectron spectroscopy. The analyses confirmed the purely covalent nature of those modifications at all stages. Eventually, we have proved the elaborated protocol as exceptionally tunable since it enabled us: (a) to synthesize superhydrophilic films from—the intrinsically hydrophobic—vertically aligned MWCNT arrays and (b) to produce printable highly electroconductive pastes of enhanced characteristics—as compared for non-modified and otherwise modified MWCNTs—for textronics.

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Chemically Modified Carbon Nanotubes in Membrane Separation

Aiswarya¹,

Kalaivani²

2022

Chemically Modified Carbon Nanotubes for Commercial Applications

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Production and functionalization of carbon nanotubes for application in membrane synthesis for natural gas separation

Cited by 10 publications

References 55 publications

Effect of Silica Sodalite Functionalization and PVA Coating on Performance of Sodalite Infused PSF Membrane during Treatment of Acid Mine Drainage

Effect of Silica Sodalite Functionalization and PVA Coating on Performance of Sodalite Infused PSF Membrane during Treatment of Acid Mine Drainage

Ullmann Reactions of Carbon Nanotubes—Advantageous and Unexplored Functionalization toward Tunable Surface Chemistry

Chemically Modified Carbon Nanotubes in Membrane Separation

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