Titania-based aerogels

Schneider, M.; Baiker, Alfons

doi:10.1016/s0920-5861(96)00164-2

Cited by 151 publications

(75 citation statements)

References 63 publications

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“…An increasing number of advanced microporous and mesoporous molecular sieves and amorphous mixed oxides, containing transition metal (TM) ions highly dispersed (isolated) in various inorganic matrices, appears to catalyze oxidations with hydroperoxides [6,9,[12][13][14][15][16][17][18][19][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. This stimulates a growing interest to the concept of single-site catalysts among people working in the field of selective oxidation.…”

Section: Introductionmentioning

confidence: 99%

Titanium-monosubstituted polyoxometalates: relation between homogeneous and heterogeneous Ti-single-site-based catalysis

Kholdeeva

2006

Top Catal

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Section: Introductionmentioning

confidence: 99%

Titanium-monosubstituted polyoxometalates: relation between homogeneous and heterogeneous Ti-single-site-based catalysis

Kholdeeva

2006

Top Catal

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“…The drying of gels under normal pressure (microporous xerogels) or supercritical conditions (mesoporous aerogels) are used for density and porosity of the oxides [27][28][29][30][31]. Presently supercritical drying for a high temperature as well as low temperature variations are used [32].…”

Section: Synthesis Of Micro and Mesoporous Materialsmentioning

confidence: 99%

Amorphous Porous Mixed Oxides: A New and Highly Versatile Class of Materials

Pandey

Mishra

2012

Intelligent Nanomaterials

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Porous solids are a rapidly developing class of materials with an ever-increasing range of applications. Among these materials, amorphous porous mixed oxides possess the extraordinary properties of fine tuning the chemical composition, microstructure, porosity and surface properties. The tailor made composition of the mixed oxides can be fabricated from the availability of variety of precursor, additives and modifiers. Besides, their performance can be found close to that of crystalline phase. These amorphous mixed oxides can easily be synthesized using acid / base catalyzed one-pot sol-gel procedure. Sol-gel processes allow for a relatively facile tailoring of the morphology of mixed oxides to the desired application in the field of nanotechnology. Pore volume, porosity, specific surface area, and surface acidity are typical parameters that can be tailored. This chapter deals with the preparation methodology, characterization techniques, and application of amorphous porous mixed oxides.

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“…It has been reported that the surface areas of TiO 2 samples synthesised by sol-gel methods are much higher than that of the ones prepared by the solvothermal method [30,31]. In general, it is well known that TiO 2 particles with anatase phase prepared via the sol-gel process possess a surface area of about 60 m 2 g -1 [32].…”

Section: N 2 Adsorptionmentioning

confidence: 99%

Dual function filtration and catalytic breakdown of organic pollutants in wastewater using ozonation with titania and alumina membranes

Zhu

Kennedy

et al. 2011

Journal of Membrane Science

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Water recycling via treatment from industrial and/or municipal waste sources is one of the key strategies for resolving water shortages worldwide. Polymer membranes are effective at improving the water quality essential for recycling, but depend on regular cleaning and replacement. Pure ceramic membranes can reduce the cleaning need and last significantly longer in the same applications whilst possessing the possibility of operating in more aggressive environments not suitable for polymers. In the current work, filtration using a tubular ceramic membrane (α-Al 2 O 3 or TiO 2 ) was combined with ozonation to remove organic compounds present in a secondary effluent to enhance key quality features of the water (colour and total organic carbon, TOC) for its potential reuse.'Bare' commercial α-Al 2 O 3 filters (pore size ~0.58 µm) were tested as a microfiltration membrane and compared with the more advanced catalytically active TiO 2 layer that was formed by the sol-gel method. The presence of anatase with a 4 nm pore size at the membrane surface was confirmed by Xray diffraction (XRD) and N 2 adsorption. Filtration of the effluent over a 2 hour period led to a reduction in flux to 45% and 60% of the initial values for the α-alumina and TiO 2 membrane, respectively. However, a brief dose (2 mins) of ozone at the start of the run resulted in reductions to only 70% of the initial flux for both membranes. It is likely that the oxide's functional property Interestingly, the porous structure therefore acted in a synergistic, dual function mode to physically separate the particulates whilst also catalytically breaking down organic matter. The system also greatly improved the efficiency of membrane filtration for the reduction of colour, A 254 (organics absorption at the wavelength of 254 nm) and TOC. The best performance came from combined ozonation (2 min ozonation time with an estimated applied ozone dose of 8 mg L -1 ) with the TiO 2 membrane, which was able to reduce colour by 88%, A 254 by 75% and TOC by 43%. It is clearly evident that a synergistic effect occurs with the process combination of ozonation and ceramic membrane filtration demonstrating the practical benefit of combining ceramic membrane filtration with conventional water ozonation.

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Titania-based aerogels

Cited by 151 publications

References 63 publications

Titanium-monosubstituted polyoxometalates: relation between homogeneous and heterogeneous Ti-single-site-based catalysis

Titanium-monosubstituted polyoxometalates: relation between homogeneous and heterogeneous Ti-single-site-based catalysis

Amorphous Porous Mixed Oxides: A New and Highly Versatile Class of Materials

Dual function filtration and catalytic breakdown of organic pollutants in wastewater using ozonation with titania and alumina membranes

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