CINDECA   05422
CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Mesoporous nanospheres of tungstosilicic acid/titania
Autor/es:
JULIÁN A. RENGIFO-HERRERA; ROMINA FRENZEL; EDGARDO L. SOTO,; MIRTA N. BLANCO; LUIS R. PIZZIO
Reunión:
Simposio; Scientific Bases for the Preparation of Heterogeneous Catalysts ? PREPA11 ?; 2014
Resumen:
The degradation of chemicals present in wastes by photocatalysis is an important issue and its study is a constantly
growing field. Titanium dioxide has been the most widely used photocatalyst due to its easy availability, low
cost, relatively high chemical stability, and its negligible toxicity. Several factors influence the photocatalytic activity
of titania, such as the crystal structure, the crystallinity, the surface area, the porosity, the band gap energy, and
the surface hydroxyl density [1]. Mesoporous titania with suitable properties to be used as photocatalyst was synthesized
via sol-gel reactions using urea as a low-cost pore-forming agent [2].
The most important disadvantages of titania as photocatalyst are the hole-electron recombination and low surface
area, which lead to low photocatalytic activity. Therefore, the photocatalytic activity of titania-based catalysts
can be improved by separation of electrons and holes, and by increasing the surface area.
On the other hand, heteropolyoxometallates (POMs) were employed as effective homogeneous photocatalysts in
the degradation of organic pollutants in water [3]. Furthermore, some heteropolyoxometallates have been used as
titania modifiers intending to reduce the charge recombination. They have been added to TiO2 suspensions, incorporated
into TiO2 colloids, or anchored to TiO2 by chemical interactions. We incorporated TPA into the titania matrix
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
into TiO2 colloids, or anchored to TiO2 by chemical interactions. We incorporated TPA into the titania matrix
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
the surface hydroxyl density [1]. Mesoporous titania with suitable properties to be used as photocatalyst was synthesized
via sol-gel reactions using urea as a low-cost pore-forming agent [2].
The most important disadvantages of titania as photocatalyst are the hole-electron recombination and low surface
area, which lead to low photocatalytic activity. Therefore, the photocatalytic activity of titania-based catalysts
can be improved by separation of electrons and holes, and by increasing the surface area.
On the other hand, heteropolyoxometallates (POMs) were employed as effective homogeneous photocatalysts in
the degradation of organic pollutants in water [3]. Furthermore, some heteropolyoxometallates have been used as
titania modifiers intending to reduce the charge recombination. They have been added to TiO2 suspensions, incorporated
into TiO2 colloids, or anchored to TiO2 by chemical interactions. We incorporated TPA into the titania matrix
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
into TiO2 colloids, or anchored to TiO2 by chemical interactions. We incorporated TPA into the titania matrix
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
band gap energy, and
the surface hydroxyl density [1]. Mesoporous titania with suitable properties to be used as photocatalyst was synthesized
via sol-gel reactions using urea as a low-cost pore-forming agent [2].
The most important disadvantages of titania as photocatalyst are the hole-electron recombination and low surface
area, which lead to low photocatalytic activity. Therefore, the photocatalytic activity of titania-based catalysts
can be improved by separation of electrons and holes, and by increasing the surface area.
On the other hand, heteropolyoxometallates (POMs) were employed as effective homogeneous photocatalysts in
the degradation of organic pollutants in water [3]. Furthermore, some heteropolyoxometallates have been used as
titania modifiers intending to reduce the charge recombination. They have been added to TiO2 suspensions, incorporated
into TiO2 colloids, or anchored to TiO2 by chemical interactions. We incorporated TPA into the titania matrix
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
into TiO2 colloids, or anchored to TiO2 by chemical interactions. We incorporated TPA into the titania matrix
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
2 suspensions, incorporated
into TiO2 colloids, or anchored to TiO2 by chemical interactions. We incorporated TPA into the titania matrix
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
2 colloids, or anchored to TiO2 by chemical interactions. We incorporated TPA into the titania matrix
during the synthesis of TiO2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.
2 gel, using urea as low-cost template in order to obtain mesoporous materials [4]. In
addition, the incorporation of POMs into the titania matrix can improve the density of the catalysts, thus facilitating
their separation from heterogeneous reaction systems in order to reuse them.
We present here the preparation and characterization of mesoporous titania directly modified with tungstosilicic
acid (TSA), using urea as a low-cost pore-forming agent, via HCl-catalyzed sol-gel reactions.
The aim is to study the influence of some preparation conditions, such as TSA concentration and calcination
temperature, on the characteristics of the tungstosilicic acid mesoporous titania nanospheres synthesized via sol?gel
reactions and measured the catalytic activity of the materials in the 4-chlorophenol photodegradation.