Synthesis of high surface area titania powders via basic hydrolysis of titanium(IV) isopropoxide

Khalil, Kamal M.S.; Zaki, Mohamed I.

doi:10.1016/s0032-5910(97)03250-6

Cited by 63 publications

(36 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Textural properties for the pure and different titania/silica supports are cited in Table 2, along with some other results reported for the pure TiO 2 prepared by basic hydrolysis (15), or controlled hydrolysis (29), and Z(TS-1) zeolite (5) for comparison. Nitrogen adsorption/desorption isotherms for the pure silica materials a Pure TiO 2 prepared by basic hydrolysis of titanium tetra-isopropoxide; mixing molar ratios were 1.0 : 1.0 : 3.1 alkoxy group : ammonia : water, Ref.…”

Section: Texture Assessment By Nitrogen Adsorption Isothermsmentioning

confidence: 99%

“…Nitrogen adsorption/desorption isotherms for the pure silica materials a Pure TiO 2 prepared by basic hydrolysis of titanium tetra-isopropoxide; mixing molar ratios were 1.0 : 1.0 : 3.1 alkoxy group : ammonia : water, Ref. (15).…”

Section: Texture Assessment By Nitrogen Adsorption Isothermsmentioning

confidence: 99%

“…However, properties such as surface area, porosity, and thermal stability of the supporting materials are largely determined by the precursors and processing method (13)(14)(15). Therefore, different synthetic approaches have been developed to prepare titania/silica-supported oxides of modified structural and textural properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Formation and Characterization of High Surface Area Thermally Stabilized Titania/Silica Composite Materials via Hydrolysis of Titanium(IV) tetra-Isopropoxide in Sols of Spherical Silica Particles

Khalil

El-Samahy

Elanany

2002

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

Section: Texture Assessment By Nitrogen Adsorption Isothermsmentioning

confidence: 99%

Section: Texture Assessment By Nitrogen Adsorption Isothermsmentioning

confidence: 99%

See 1 more Smart Citation

Formation and Characterization of High Surface Area Thermally Stabilized Titania/Silica Composite Materials via Hydrolysis of Titanium(IV) tetra-Isopropoxide in Sols of Spherical Silica Particles

Khalil

El-Samahy

Elanany

2002

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

“…Further this peak intensity decreases slightly with increase in the concentration of the metallic silver on the surface of TiO 2 . The peaks at ∼3400, 2930 and 2850 cm −1 were attributed to the Ti OH bond in the case of SG-TiO 2 [20]. The FTIR spectrum of TiO 2 exhibits strong absorption band at ∼466 cm −1 , which may be due to the vibrations of Ti O Ti, Ti O O and Ti O bonds in the TiO 2 lattice.…”

Section: Ftir Analysismentioning

confidence: 94%

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

Nagaraj

Devi

2014

Journal of Molecular Catalysis A: Chemical

View full text Add to dashboard Cite

a b s t r a c tSilver was deposited on manganese-doped titanates (Mn-TiO 2 ) by photoinduced deposition method. The catalyst shows enhanced photocatalytic activity due to the synergistic effect of bicrystalline framework of anatase and rutile structures with high intimate contact due to the similarity in their crystallite sizes. The deposited metal nanostructures help in the formation of resonant surface plasmons in response to a photon flux, localizing the electromagnetic energy close to their surfaces. Better charge separation is achieved near the semiconductor surface due to the localized field. Silver deposition was varied from 0.1 to 1.5% on the surface of Mn-TiO 2 . The mechanism of interfacial electron transfer at heterojunctions in mixed phase induced by the plasmonic catalysis is explained. The extent of band bending, the variation of potential field in the space charge region with respect to the size of the deposited Ag metal particles is discussed. The photocatalytic activity of silver deposited Mn-TiO 2 was evaluated by taking resorcinol (Rs) as the model compound along with oxidants such as hydrogen peroxide (H 2 O 2 ) and ammonium per sulfate (APS) under UV/solar light illumination. The electronic level of the dopant, high intimate contact between the anatase and rutile phases along with efficient electron trapping by silver particles, plays a significant role in the photocatalytic process.

show abstract

“…Las bandas que aparecen en la región de baja frecuencia en los espectros de infrarrojo situadas en el intervalo de 650-450 cm -1 son características de enlaces Ti-O-Ti [20]. Los picos a 2927 y 2854 cm -1 observados en los espectros de los materiales sintetizados, pueden ser asignados a tensiones C-H e indicar la presencia de materia orgánica remante en los sólidos, relacionada con el ácido acético utilizado durante la síntesis [17,21]. Las señales que aparecen en el espectro del hidróxido de titanio (material MA) centradas a 3150 y 1401 cm -1 pueden resultar de modos vibracionales del tipo tensión y flexión características de enlaces N-H, mismas que pueden estar relacionadas con iones amonio (NH 4 + ) formados durante la disociación del NH 4 OH, especies que se encuentran adsorbidas en la superficie del material a bajas temperaturas y que actúan como fuente de nitrógeno, el cual se incorpora a la estructura del TiO 2 durante el proceso de calcinación [17,22,23] ), corroborando su presencia por XPS y sugiriendo que este anión identifica la presencia de nitrógeno estructural en la red del óxido de titanio [25][26][27].…”

Section: Espectroscopía Infrarrojaunclassified

Síntesis, caracterización y actividad fotocatalítica de óxido de titanio modificado con nitrógeno

Enríquez¹,

García-Alamilla²,

Serrano³

et al. 2011

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

Se sintetizaron óxidos de titanio (TiO 2 ) a partir de la precipitación del tetracloruro de titanio (TiCl 4 ) con hidróxido de amonio (NH 4 OH). Los materiales sintetizados se caracterizaron mediante fisisorción de nitrógeno, difracción de rayos X, espectroscopía infrarroja, reflectancia difusa U.V.-visible y la actividad fotocatalítica de los mismos se evaluó en la degradación del naranja de metilo. Mediante el método de síntesis se logró dopar la estructura del óxido de titanio con nitrógeno (N-TiO 2 ), estabilizando la fase anatasa y obteniéndose materiales catalíticos mesoporosos y nanocristalinos. El óxido de titanio de mayor área específica (132 m 2 /g) degradó el azo-colorante al 100% en 180 minutos de reacción. Palabras clave: síntesis, óxidos de titanio, materiales mesoporosos, materiales nanocristalinos, azo-compuestoSynthesis, characterization and photocatalytic activity of titanium oxide modified with nitrogen Titanium oxides (TiO 2 ) were synthesized by precipitation of titanium tetrachloride (TiCl 4 ) using ammonium hydroxide (NH 4 OH). The synthesized materials were characterized by means of nitrogen physisorption, X-ray diffraction, infrared spectroscopy, U.V.-visible diffuse reflectance spectroscopy and the photocatalytic activity of the samples were measured by the degradation of the methyl orange. By means of this synthesis method we have doped the titanium oxide structure with nitrogen (N-TiO 2 ), stabilizing the anatase phase and obtaining mesoporous and nanocrystalline materials. The titanium oxide with higher specific surface area (132 m 2 /g) degraded the azo-compound to 100% in 180 min of reaction. Keywords: synthesis, titanium oxides, mesoporous materials, nanocrystalline materials, azo-compound INTRODUCCIÓNLos efluentes de la industria textil presentan un gran potencial de impacto sobre el medio ambiente, debido a los grandes volúmenes de agua residual generados con un alto contenido de materia orgánica y una fuerte coloración. A causa de la gran estabilidad de los colorantes (azocompuestos), los procesos convencionales para el tratamiento de aguas residuales tales como adsorción, floculación y procesos de lodos activados no son eficientes para la decoloración de los efluentes textileros, ya que no pueden degradar eficientemente los compuestos orgánicos o generan contaminantes secundarios que pueden ser tóxicos para el medio ambiente y que requieren de un tratamiento adicional (1-3). Una alternativa al tratamiento convencional de las aguas residuales es la oxidación fotocatalítica (fotocatálisis), la cual, ha despertado un gran interés debido a que las investigaciones han mostrado la degradación de contaminantes orgánicos a bajas y medianas concentraciones, con una generación baja en contaminantes secundarios. La fotocatálisis heterogénea consiste en la degradación del contaminante a través de la utilización de catalizadores (óxidos semiconductores), radiación ultravioleta y/o solar, generando con ello radicales Vol 50, 5, 245-252, Septiembre-Octubre 2011 ISSN 0366-3175. eISSN 2173-043...

show abstract

Synthesis of high surface area titania powders via basic hydrolysis of titanium(IV) isopropoxide

Cited by 63 publications

References 20 publications

Formation and Characterization of High Surface Area Thermally Stabilized Titania/Silica Composite Materials via Hydrolysis of Titanium(IV) tetra-Isopropoxide in Sols of Spherical Silica Particles

Formation and Characterization of High Surface Area Thermally Stabilized Titania/Silica Composite Materials via Hydrolysis of Titanium(IV) tetra-Isopropoxide in Sols of Spherical Silica Particles

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

Síntesis, caracterización y actividad fotocatalítica de óxido de titanio modificado con nitrógeno

Contact Info

Product

Resources

About