Synthesis of highly monodispersed teardrop-shaped core–shell SiO2/TiO2 nanoparticles and their photocatalytic activities

Wu, Lihong; Zhou, Yifeng; Nie, Wangyan; Song, Linyong; Chen, Pengpeng

doi:10.1016/j.apsusc.2015.05.152

Cited by 73 publications

(32 citation statements)

References 35 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It can be seen from Figure 4 that pure XTiO2@diatomite achieves absorption at 200-400 nm, although, according to previous studies [46], pure SiO2 has no absorption at 200-400 nm. Therefore, the composite formed through a combination of the two with Si-O-Ti, which shows a red shift, may be attributed to the formation of this chemical bond, which reduces the energy and causes a slight red shift.…”

Section: Uv-vis Diffuse Reflectance Spectrasupporting

confidence: 62%

Highly Efficient Photo-Degradation of Gaseous Organic Pollutants Catalyzed by Diatomite-Supported Titanium Dioxide

Liu

Yang

et al. 2020

Catalysts

View full text Add to dashboard Cite

Volatile organic compounds (VOCs) are the most harmful contaminants that have been identified, most of which are gaseous organic pollutants. In this study, TiO2@diatomite catalysts with various loading amounts of TiO2 were fabricated using a facile solvothermal method with anhydrous ethanol as a solvent for the removal of VOCs. X-ray diffraction analysis revealed that TiO2 has an anatase phase and the introduction of diatomite has no negative effect. The catalysts were characterized using scanning electron microscopy and transmittance electron microscopy techniques. The results indicate that after introducing diatomite, TiO2 nanoparticles are mostly square-like and intact, and are uniformly immobilized in the diatomite. Finally, their photocatalytic performance was investigated using liquid ultraviolet spectrometry and gas chromatography-mass spectrometry. Among the catalysts tested, 0.35TiO2@diatomite (with a mass ratio of TiO2 to diatomite of 0.35) exhibited higher photocatalytic activity than the other samples, i.e., pure TiO2 and diatomite, and could effectively remove acetone and benzene, demonstrating its potential market application and practical significance.

show abstract

Section: Uv-vis Diffuse Reflectance Spectrasupporting

confidence: 62%

Highly Efficient Photo-Degradation of Gaseous Organic Pollutants Catalyzed by Diatomite-Supported Titanium Dioxide

Liu

Yang

et al. 2020

Catalysts

View full text Add to dashboard Cite

show abstract

“…Titania-silica composite particles with various morphologies have been developed, such as porous particles, spheres and fibers [5,6]. The microstructures, sizes and shapes have great influence on the properties of titania-silica composites, such as catalytic activity, thermal properties, photoactivity and chemical durability [7,8]. The Pechini process [9][10][11] has the advantage of molecular level mixing of the components and low calcination temperature.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Titania-silica Composite Particles by Pechini Sol-gel Method

Wang

et al. 2016

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract.Two Pechini sol-gel processes were used to prepare titania-silica composite particles. The dynamic oxidation behavior of the TiO 2 -SiO 2 powders has been characterized by thermogravimetry-differential scanning calorimetry (TG-DTG-DSC). The crystal phase and microstructure of the composite particles were investigated by X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM). The effects of Si:Ti molar ratio and sol-gel process on the TiO 2 -SiO 2 powders were studied. The preparation of the polymeric precursors can influence the morphology of obtained TiO 2 -SiO 2 composite particles. The spherical TiO 2 -SiO 2 composite particles which are 20 nm~400 nm in diameter appear in gel-1 system. However, the TiO 2 -SiO 2 powders obtained by gel-2 system are irregular in shape and 2~15 μm in diameter which show a loose porous structure consisted of very fine granules.

show abstract

“…Liu [24] prepared mesoporous SiO 2 aerogel/W x TiO 2 nanocomposites by a hydrothermal deposition method using SiO 2 aerogel as a carrier. Besides the increase in specific surface area, the photocatalytic activity of TiO 2 can also be improved by the SiO 2 modification as the interaction between the counterparts increases the concentration of photocatalytically active centers [5,25]. In order to increase the interfacial area between TiO 2 and SiO 2 , Resende et al [26] introduced SiO 2 colloidal particle into mesoporous TiO 2 microspheres by an ultrasonic treatment of TiO 2 microspheres in SiO 2 sol and a subsequent heat treatment of the microspheres.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Wu et al [5] synthesized core-shell structural SiO 2 /TiO 2 NPs using monodispersed teardrop-shaped silica NPs as carrier by sol-gel method. Liu [24] prepared mesoporous SiO 2 aerogel/W x TiO 2 nanocomposites by a hydrothermal deposition method using SiO 2 aerogel as a carrier.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism of TiO 2 -based photocatalytic reaction [4,5] can be described as follows: Electrons in the valence band of TiO 2 absorb photon energy and get excited to the conduction band with the formation of positive holes in the valence band. The excited electrons can react with adsorbed O 2 to form superoxide radical anions (ÁO 2 -), while the holes in valence band react with adsorbed OH -or H 2 O to form highly reactive hydroxyl radicals (ÁOH) that has strongly oxidizing power for the degradation of recalcitrant organic compounds but has short lifetime (usually 10 -9 s).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Facile synthesis of SiO2@TiO2 crystallite photocatalysts with enhanced interaction level and high light absorption efficiency

Dong

Jin

et al. 2017

Nanotechnol. Environ. Eng.

View full text Add to dashboard Cite

SiO 2 @TiO 2 crystallite photocatalysts with TiO 2 crystallite core and porous amorphous SiO 2 /TiO 2 shell were synthesized as photocatalyst by one-pot hydrothermal process using tetrabutyl titanate (TBOT) complex and ethyl orthosilicate (TEOS) as Ti and Si sources, respectively. The synthesized SiO 2 @TiO 2 crystallite photocatalysts were characterized by transmission electron microscopy, X-ray diffraction pattern, UV-Vis diffuse reflectance spectrum and N 2 adsorption-desorption isotherm. The interaction between TiO 2 and SiO 2 , which is associated with photocatalytically active centers, is significantly improved through an enlargement in the interfacial area and the optimization of SiO 2 fraction. The SiO 2 modification does not lower the light absorption efficiency of TiO 2 crystallite core owning to the low reflectivity of porous SiO 2 /TiO 2 shell but endows the photocatalyst with easy separation behavior from aqueous solution. Furthermore, the reciprocal inhibition in volume shrinkage of TBOT complex-and TEOS-derived gel networks, as a consequence of mineralization asynchronism, increases the specific surface area and pore volume of the formed SiO 2 / TiO 2 shell. The enhanced photocatalytic activity of SiO 2 @TiO 2 crystallite photocatalysts by SiO 2 modification is mainly ascribed to an increase in the interaction level, the high light absorption efficiency of SiO 2 @TiO 2 crystallite photocatalysts and an enlargement in specific surface area of SiO 2 /TiO 2 shell.

show abstract

Synthesis of highly monodispersed teardrop-shaped core–shell SiO2/TiO2 nanoparticles and their photocatalytic activities

Cited by 73 publications

References 35 publications

Highly Efficient Photo-Degradation of Gaseous Organic Pollutants Catalyzed by Diatomite-Supported Titanium Dioxide

Highly Efficient Photo-Degradation of Gaseous Organic Pollutants Catalyzed by Diatomite-Supported Titanium Dioxide

Preparation and Characterization of Titania-silica Composite Particles by Pechini Sol-gel Method

Facile synthesis of SiO2@TiO2 crystallite photocatalysts with enhanced interaction level and high light absorption efficiency

Contact Info

Product

Resources

About