Characterization and photocatalytic activity of noble-metal-supported surface TiO2/SiO2

Hu, Chun; Tang, Yuchao; Jiang, Zheng; Hao, Zhixin; Tang, Hongxiao; Wong, Po Keung

doi:10.1016/s0926-860x(03)00545-3

Cited by 75 publications

(18 citation statements)

References 16 publications

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“…The effect of the doping agent in the degradation efficiency is not evident. Positive effect of additives in the decomposition of different organic compounds has been published [2][3][4][5][6][7][8][9], but opposite results have been also reported [1,7,9]. This miscellaneous behaviour can be explained by the difference in the morphology, crystal structure, specific surface area and the surface density of the OH groups of the studied TiO 2 catalysts, due to the various preparation methods applied in their synthesis [22].…”

Section: Introductionmentioning

confidence: 94%

“…The importance of pollutant's adsorption on the catalyst surface was stated for Pt, Pd and Ag doped titania/silica samples by Hu et al [2]. They found that the silver-modified samples showed almost the same photocatalytic activity as the pure support material.…”

Section: Introductionmentioning

confidence: 97%

“…photosensitization) resulting in enhanced photocatalytic activity is one of the most important aspects of heterogeneous photocatalysis. Deposition of different metals (like Pt, Pd, Au, Ag, Fe, Nb and Cu) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] or oxides such as WO 3 [17] onto titanium dioxide has been widely used as a technique to extend the light absorption to the visible region.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Kőrösi

Papp

Ménesi

et al. 2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Silver-modified titania samples (Ag-TiO 2 ) with varying silver content (0.1-1.0 wt%) were prepared. Silver-modification of titanium dioxide was examined by TEM, XRD, XPS and DR-UV-vis spectroscopy. Ag or AgO x particles on TiO 2 surface could not be observed by XRD and TEM investigation, however the color of the Ag-TiO 2 samples varied between light rose and purple-brown. XPS measurements revealed that silver exists mainly in oxide form. The photocatalytic activity of pure and Ag-TiO 2 samples were compared both in solid-liquid and in solid-gas interfaces. In the liquid phase the 2,2 -thiodiethanol was used as test molecule. Ethanol photodegradation was examined in gas phase at dry initial condition. It was shown that the rate of photooxidation of organic compounds significantly enhanced by silver-modification of titania.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Kőrösi

Papp

Ménesi

et al. 2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Titania dioxide has received much attention with respects to the degradation of a large amount of organic wastes such as dyes, pesticides, bacteria and herbicides [1][2][3][4] .Of all semiconductor materials, titania dioxide is particularly suitable for such applications, because it is highly photo-， reactive, inexpensive non-toxic, chemically and biologically inert. Pure TiO 2 , however, demonstrates shortcoming of low utilization of solar light and photons rate because of its wide band gap.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activities of amorphous TiO2-Cr thin films prepared by magnetron sputtering

Huang

Xiao-ping

et al. 2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Chrome-doped titanium oxide films were prepared by reactive magnetron sputtering method. The films deposited on glass slides at room temperature were investigated by atom force microscope, X-ray diffractometer, X-ray photoelectron spec ， troscopy UV-Vis spectrophotometer, the photoluminescence (PL) and ellipse polarization apparatus. The results indicate that TiO 2 -Cr film exists in the form of amorphous. The prepared films possess a band gap of less than 3.20 eV, and a new absorption peak. The films, irradiated for 5 h under UV light, exhibit excellent photocatalytic activities with the optimum decomposition rate at 98.5% for methylene blue. Consequently, the thickness threshold on these films is 114 nm, at which the rate of photodegradation is 95% in 5 h. When the thickness is over 114 nm, the rate of photodegradation becomes stable. This result is completely different from that of crystalloid TiO 2 thin film.

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“…The oxygen vacancies generated on the sulfated titania and the presence of metal nanoparticles decreases the electron-hole recombination, thus improving the TiO 2 efficiency in the photodegradation reactions. It has been reported that the improvement of TiO 2 photoactivity by noble metal addition depends not only on metal content but also on TiO 2 properties, metal particle size and metal oxidation state [8][9][10][11][12][13]. So, it is very important to control the synthesis parameters in order to obtain highly effective photocatalysts based on modified TiO 2 [14].…”

Section: Introductionmentioning

confidence: 99%

Methylene blue degradation over M-TiO2 photocatalysts (M= Au or Pt) / Degradación de azul de metileno sobre fotocatalizadores M-TiO2 (M = Au o Pt)

Mesa¹,

Romero²,

Macías³

et al. 2017

Cienc. En Desarro.

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In this study it was evaluated the methylene blue degradation over TiO 2 modified by sulfation and Au or Pt addition. These materials were synthesized by photodeposition method and then were widely characterized by different techniques. In general, it was found that Au or Pt particles size distribution can be effectively controlled modifying the deposition time. It was also found that metal particle size and dye adsorption on TiO 2 surface, are important factors influencing the methylene blue degradation rate. The highest dye degradation was obtained on Au-S-TiO 2 photocatalyst prepared by using 120 min of deposition time; the highest effectiveness of this material in the methylene blue degradation can be mainly due to a combined effect between the presence of gold nanoparticles acting as a sink for the electrons photogenerated during the catalytic reaction and the better adsorption of the dye over the S-TiO 2 surface partially covered by gold particles with the largest sizes. Keywords: Methylene blue, photodegradation, sulfated TiO 2 , M-TiO 2 , photocatalysts. ResumenEn este estudio se evaluó la degradación de azul de metileno sobre TiO 2 modificado por sulfatación y adición de Au o Pt. Estos materiales fueron sintetizados a través del método de fotodeposición y caracterizados usando diferentes técnicas. En general, se encontró que la distribución de tamaño de partícula de Au o Pt se puede controlar efectivamente modificando el tiempo de fotodeposición. Se encontró también que factores como el tamaño de partícula metálica y la adsorción del colorante sobre la superficie del TiO 2 influencian de manera importante la velocidad de degradación del azul de metileno. La mayor degradación del colorante se obtuvo usando el fotocatalizador Au-S-TiO 2 preparado con un tiempo de deposición de 120 min; la alta efectividad de este material en la degradación del azul de metileno se debe principalmente a un efecto combinado entre la presencia de partículas de oro que actúan como colectores de los electrones fotogenerados durante la reacción catalítica y a la mejor adsorción del colorante sobre la superficie del S-TiO

show abstract

Characterization and photocatalytic activity of noble-metal-supported surface TiO2/SiO2

Cited by 75 publications

References 16 publications

Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Photocatalytic activity of silver-modified titanium dioxide at solid–liquid and solid–gas interfaces

Photocatalytic activities of amorphous TiO2-Cr thin films prepared by magnetron sputtering

Methylene blue degradation over M-TiO2 photocatalysts (M= Au or Pt) / Degradación de azul de metileno sobre fotocatalizadores M-TiO2 (M = Au o Pt)

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