Sodium titanate nanotubes for efficient transesterification of oils into biodiesel

Zaki, A.H.; Naeim, Asamaa A.; El-Dek, S.I.

doi:10.1007/s11356-019-06602-z

Cited by 22 publications

(7 citation statements)

References 45 publications

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“…The effects of TiO 2 morphology and immobilization w/w ratio on the biodiesel yield were evaluated using sunflower oil as a substrate at a reaction temperature of 40 °C for 90 min using a methanol-to-oil molar ratio of 6:1 because it was noticed that a high methanol-to-oil molar ratio improves the reaction between methanol and triglyceride, which shifts the reaction forward to completion and avoids a reversible reaction; hence, it produces a higher biodiesel yield in a shorter time . The yield was calculated using the following equation − The results revealed that when comparing the biodiesel yield of lipase immobilized over different morphologies of TiO 2 , the highest yield was achieved using lipase immobilized over microspheres. Therefore, the sample S-LIP achieved a biodiesel yield of 65%, and the samples T-LIP and Sh-LIP achieved 46 and 60% yields, respectively (Figure ).…”

Section: Results and Discussionmentioning

confidence: 99%

Effect of Different TiO₂ Morphologies on the Activity of Immobilized Lipase for Biodiesel Production

2021

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Lipase catalytic activity is greatly influenced by immobilization on nanoparticles. In this study, lipase from Aspergillus niger was immobilized on TiO 2 nanoparticles with different morphologies: microspheres, nanotubes, and nanosheets. All TiO 2 samples were prepared by a hydrothermal method. Lipase/TiO 2 nanocomposites were prepared by a physical adsorption method through hydrophobic interactions. The prepared composites were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). The catalytic activity of free and immobilized lipases was tested using sunflower oil in the presence of methanol to produce biodiesel at 40 °C for 90 min. The lipase immobilized on TiO 2 microspheres showed the highest activity compared to the lipase immobilized on TiO 2 nanotubes and nanosheets. To optimize the lipase-to-microsphere ratio, lipase was immobilized on TiO 2 microspheres in different microspheres/lipase, w/w, (S/L) ratios of 1:1, 1:0.75, 1:0.5, and 1:0.25. It was noticed that the hydrolytic activity follows the order 1:0.25 > 1:0.5 > 1:75 > 1:1. The immobilization yield activities were found to be 113, 123, 125, and 130% for the microspheres/lipase (S/L) ratios of 1:1, 1:0.75, 1:0.5, and 1:0.25, respectively.

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Section: Results and Discussionmentioning

confidence: 99%

Effect of Different TiO₂ Morphologies on the Activity of Immobilized Lipase for Biodiesel Production

2021

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“…Na-TNTs were prepared using a common hydrothermal method. 16 First, 500 mL of 10 N NaOH was mixed with 10 g of pure anatase-phase titanium dioxide nanoparticles. The NaOH reacted with TiO 2 to produce nanosheets, which were grown in an anisotropic way, presenting faster growth along the b -axis.…”

Section: Experimental Studymentioning

confidence: 99%

“…Na-TNTs were prepared using a common hydrothermal method . First, 500 mL of 10 N NaOH was mixed with 10 g of pure anatase-phase titanium dioxide nanoparticles.…”

Section: Experimental Studymentioning

confidence: 99%

Electronic Structures and Electrical Properties of Cr²⁺-, Cu²⁺-, Ni²⁺-, and Zn²⁺-Doped Sodium Titanate Nanotubes

et al. 2022

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Sodium titanate nanotubes (Na-TNTs) and their metal-doped derivatives were prepared using simple hydrothermal and metal ion-exchange methods, respectively. The as-prepared doped materials were characterized by X-ray powder diffraction, thermal gravimetric analysis, high-resolution transmission electron microscopy, field-emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The dielectric constant, the loss tangent, and the AC electrical conductivity of NaM-TNTs (where M = Cr, Cu, Ni, or Zn) were measured at selected frequencies (400 kHz and 2 MHz) as a function of temperature. The activation energy was calculated and reported at 400 kHz. All samples showed mixed ionic electronic conductivity. Some of the materials were used as examples for theoretically exploring structures and optoelectronic properties (density of states, reflectivity, absorption curve, refractive index, dielectric function, optical conductivity, and loss function) using density functional theory calculations. The band gaps of the materials were found to vary from 2.4 to 3.17 eV, which makes them suitable for many optoelectronic applications.

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“…Some researchers have suggested that the sodium titanate nanotubes is an effcient heterogenous base catalyst in the transesterification reactions, which is the most common route for biodiesel production ( Hernández-Hipólito et al, 2014 ). Recently, the sodium titanates were used as catalysts in the transesterification of pure and cooked oils into biodiesel ( Zaki et al, 2019 ). The biodiesel yield was found to be 95.9% at 80°C for 2 h; the authors discovered that the catalyst showed high activity for cooked oil conversion, with yields of 96.0, 96.0, and 93.58% for the first, second, and third uses of oil, respectively.…”

Section: Biomass Derived Chemicals Productionmentioning

confidence: 99%

Titanate Nanotubes-Based Heterogeneous Catalyst for Efficient Production of Biomass Derived Chemicals

Zhou

Bai

et al. 2022

Front. Chem.

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The development of efficient heterogeneous catalytic system to convert plentiful biomass to renewable bio-chemicals is urgent need. Titanate nanotubes-based materials obtained from hydrothermal treatment have been reported as low-cost and efficient catalytic materials in chemical syntheses for bio-based chemicals production with interesting catalytic performance. This mini-review expressly revealed the significance and potential of using titanate nanotubes based material as sustainable and environmentally benign solid catalysts/supports for synthesis of various bio-based chemicals, including glycerol-derived solketal, jet fuel range alkanes precursors, biomass-derived esters, aldehydes, aromatic compounds and so on. From the current knowledge on titanate nanotubes-based material via hydrothermal method here summarized, the future lines of research in the field of catalysis/supports for bio-based chemicals production are outlined.

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Sodium titanate nanotubes for efficient transesterification of oils into biodiesel

Cited by 22 publications

References 45 publications

Effect of Different TiO₂ Morphologies on the Activity of Immobilized Lipase for Biodiesel Production

Effect of Different TiO₂ Morphologies on the Activity of Immobilized Lipase for Biodiesel Production

Electronic Structures and Electrical Properties of Cr²⁺-, Cu²⁺-, Ni²⁺-, and Zn²⁺-Doped Sodium Titanate Nanotubes

Titanate Nanotubes-Based Heterogeneous Catalyst for Efficient Production of Biomass Derived Chemicals

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Sodium titanate nanotubes for efficient transesterification of oils into biodiesel

Cited by 22 publications

References 45 publications

Effect of Different TiO2 Morphologies on the Activity of Immobilized Lipase for Biodiesel Production

Effect of Different TiO2 Morphologies on the Activity of Immobilized Lipase for Biodiesel Production

Electronic Structures and Electrical Properties of Cr2+-, Cu2+-, Ni2+-, and Zn2+-Doped Sodium Titanate Nanotubes

Titanate Nanotubes-Based Heterogeneous Catalyst for Efficient Production of Biomass Derived Chemicals

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Effect of Different TiO₂ Morphologies on the Activity of Immobilized Lipase for Biodiesel Production

Effect of Different TiO₂ Morphologies on the Activity of Immobilized Lipase for Biodiesel Production

Electronic Structures and Electrical Properties of Cr²⁺-, Cu²⁺-, Ni²⁺-, and Zn²⁺-Doped Sodium Titanate Nanotubes