Influence of a non-polar medium (alkane and molten polypropylene) on the titanium n-butoxide hydrolysis-condensation reactions

Bahloul, Walid; Bounor‐Legaré, Véronique; Seytre, Gérard; Cassagnau, Philippe

doi:10.1007/s10971-010-2327-1

Cited by 20 publications

(12 citation statements)

References 42 publications

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“…The as-received bulk cube of TiO 2 -coated Al 2 O 3 foam was scanned in the reflectance mode using FTIR ( Figure 7). The main band is observed in the scan between 640 and 700 cm −1 , as well as slightly below 500 cm −1 , all assigned to Ti-O stretching vibrations [40]. According to the literature, the large band between 900 and 500 cm −1 is characteristic for Al 2 O 3 , where stretching vibration of the Al-O-Al bond occurs.…”

Section: Structural Properties Of the Al 2 O 3 Foam Substrate And Tiomentioning

confidence: 71%

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

et al. 2020

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In the present work, alumina (Al2O3) foam was prepared by the replica method where a polyurethane (PU) foam (30 pores per inch (ppi)) template was impregnated with a 60 wt.% Al2O3 suspension. Sintered Al2O3 foam was used as substrate for the deposition of sol-gel derived titania (TiO2) film using dip coating. For the preparation of TiO2 sol, titanium(IV) isopropoxide (Ti-iPrOH) was used as the precursor. The common problem of qualification and quantification of a crystalline coating on a highly porous 3D substrate with an uneven surface was addressed using a combination of different structural characterization methods. Using Powder X-ray Diffraction (PXRD) and synchrotron Grazing Incidence X-ray Diffraction (GIXRD) on bulk and powdered Al2O3 foam and TiO2-coated Al2O3 foam samples, it was determined Al2O3 foam crystallizes to corundum and coating to anatase, which was also confirmed by Fourier Transformed Infrared Spectroscopy (FTIR). Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM/EDS) revealed the structural and microstructural properties of the substrate and coating. Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) were used to clarify the evolution of the porous microstructure. The Al2O3-TiO2 composite was evaluated as a photocatalyst candidate for the degradation of the micropollutant medication memantine. The degradation rate was monitored using a light-emitting diode (LED) lamp operating at electromagnetic (EM) wavelength of 365 nm. The photocatalytic activity of sol-gel-derived TiO2 film immobilized on the Al2O3 foam was compared with commercially available TiO2 nanoparticles, P25-Degussa, in the form of a suspension. The levels of memantine were monitored by High-Performance Liquid Chromatography–Tandem Mass Spectrometry (HPLC–MS/MS). The efficiency and rate of the memantine photodegradation by suspended TiO2 nanoparticles is higher than the TiO2-coated Al2O3 foam. But, from the practical point of view, TiO2-coated Al2O3 foam is more appropriate as a valuable photocatalytic composite material.

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Section: Structural Properties Of the Al 2 O 3 Foam Substrate And Tiomentioning

confidence: 71%

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

et al. 2020

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“…To complete the hydrolysis/condensation process, the samples were placed in hot water ( T = 80 °C) for 3 days. According to our previous work,38 the hydrolysis‐condensation reaction of the inorganic phase is then completed. These samples were named I‐2.9TiO 2 , I‐6TiO 2 , and I‐9.3TiO 2 , respectively.…”

Section: Methodsmentioning

confidence: 99%

Morphology and viscoelasticity of PP/TiO₂ nanocomposites prepared by in situ sol–gel method

Bahloul

Bounor‐Legaré

David

et al. 2010

J Polym Sci B Polym Phys

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PP/TiO 2 nanocomposites were prepared from an original method based on the hydrolysis-condensation (sol-gel method) reactions of titanium alkoxide inorganic precursor premixed with polypropylene (PP) under molten conditions. Nanocomposites with a mean diameter of primary particles lower than 5 nm were then prepared. The TiO 2 particle dispersion in the PP matrix was characterized over a wide length scale from the combination of small angle X-ray scattering, transmission electron microscopy, and linear viscoelasticty of molten nanocomposites. As a result, a fractal structure of these particles was highlighted at the highest concentration (u r ! 0.014) with a characteristic aggregation size d aggr % 130 nm. The relationships between fractal structure and linear viscoelastic have been discussed from the main works of the literature on the reinforcement of nanocomposites. The drastic alteration of the terminal relaxation zone (solid-like behavior) is correlated to the formation of an aggregate-particle network. The study of the nonlinear viscoelastic behavior (Payne effect) agrees qualitatively with this reinforcement mechanism.

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“…Consequently, an original route to minimize these problems is the in situ synthesis of the inorganic particle in the molten polymer matrix by reactive extrusion. This synthesis is based on hydrolysis–condensation reactions “sol–gel” process of silica or metal oxide precursors, leading to the obtainment of an inorganic network of nanoparticles and a dispersion of inorganic fillers through the polymer matrix .…”

Section: Introductionmentioning

confidence: 99%

Isothermal crystallization kinetics and morphology of PP/TiO₂ nanocomposites using titanium n‐butoxide precursor

Silva

Oliveira

2014

Polymer Composites

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This study investigates the influence of the addition of TiO2, obtained by hydrolysis–condensation reaction of titanium dioxide precursors, on the kinetics of polypropylene (PP) isothermal crystallization. The dispersion of nanoparticle and its relation to the degree of crystallinity by XRD was also investigated. The results indicated that the addition of the TiO2 increased the degree of crystallinity of PP and its crystallization temperature. Likewise, the nucleation and crystal growth processes were also affected, as indicated by the TEM morphology, the Avrami kinetic model, and the optical microscopy, in which a nucleation effect was detected. POLYM. COMPOS. 36:517–526, 2015. © 2014 Society of Plastics Engineers

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Influence of a non-polar medium (alkane and molten polypropylene) on the titanium n-butoxide hydrolysis-condensation reactions

Cited by 20 publications

References 42 publications

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

Morphology and viscoelasticity of PP/TiO₂ nanocomposites prepared by in situ sol–gel method

Isothermal crystallization kinetics and morphology of PP/TiO₂ nanocomposites using titanium n‐butoxide precursor

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Influence of a non-polar medium (alkane and molten polypropylene) on the titanium n-butoxide hydrolysis-condensation reactions

Cited by 20 publications

References 42 publications

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

Titania-Coated Alumina Foam Photocatalyst for Memantine Degradation Derived by Replica Method and Sol-Gel Reaction

Morphology and viscoelasticity of PP/TiO2 nanocomposites prepared by in situ sol–gel method

Isothermal crystallization kinetics and morphology of PP/TiO2 nanocomposites using titanium n‐butoxide precursor

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Product

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Morphology and viscoelasticity of PP/TiO₂ nanocomposites prepared by in situ sol–gel method

Isothermal crystallization kinetics and morphology of PP/TiO₂ nanocomposites using titanium n‐butoxide precursor