Preparation and visible-light photocatalytic activity of Au- and Cu-modified TiO2 powders

Nogawa, Takashi; Isobe, Toshihiro; Matsushita, Sachiko; Nakajima, Akira

doi:10.1016/j.matlet.2012.05.031

Cited by 44 publications

(26 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 and 6). Such a mechanism has been described in articles [28,29]. In addition, it would probably be possible to observe a trend associated with the localized surface plasmon resonance (LSPR) in obtained TiO 2 nanopowders doped by silver, which might be represented by the peak λ Ag related to absorption on the silver admixture.…”

Section: Resultsmentioning

confidence: 80%

“…We believe that it is related to the amount of Ag and Cu dopants, which are the highest in specified samples. Optical parameters such as a maximum of absorbance, characteristic peak related to the absorption on copper or silver and an optical band gap were calculated from a Kubelka-Munk function (K-M) which has also been employed in articles [28,53,54]:…”

Section: Resultsmentioning

confidence: 99%

“…To achieve this goal, it is necessary to dope pure TiO 2 with metal ions (Pt, Pd, Au, Ag, Ta, Zr, Cu, Nd, Ni, Fe, Cr, V, Mn, Co, Pb, Ce, W etc.) [26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of metallic dopants to titanium dioxide leads to the formation of an inhomogeneous electric field in the material, which allows it to obtain more effective quantum efficiency, to change the shape an absorption curve, and to a slight effective modification of the energy band gap. Increasing photoactivity by doping pure TiO 2 material with metals in an anatase form leads to an improvement in the interfacial charge transfer (IFCT) [28]. Also, it is possible to observe such characteristic phenomenon related with interaction of metallic dopants with the light from visible range spectrum as localized surface plasmon resonance (LSPR) [28].…”

Section: Introductionmentioning

confidence: 99%

“…Increasing photoactivity by doping pure TiO 2 material with metals in an anatase form leads to an improvement in the interfacial charge transfer (IFCT) [28]. Also, it is possible to observe such characteristic phenomenon related with interaction of metallic dopants with the light from visible range spectrum as localized surface plasmon resonance (LSPR) [28]. Doped and undoped TiO 2 can be synthesized by several processes including: sol-gel [36][37][38]; hydrothermal [7,30,39,40]; spray or laser pyrolysis [41,42]; mechanical alloying [43,44]; and chemical vapour deposition (CVD) [45,46].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

2016

View full text Add to dashboard Cite

Titanium dioxide doped nanopowders were prepared in two ways: (i) by applying a sol-gel method and (ii) by applying the sol-gel synthesis as the first step for pure TiO2 preparation, and next, doped by using magnetron sputtering technique, that is one of a physical vapour deposition method. Silver and copper (Ag, Cu) metals were used as the dopants. Prepared samples were investigated by scanning electron microscope, X-ray diffraction and UV-Vis spectroscopy. The effect of the dopants' nature and the applied doping method were studied. The results showed that each prepared particles are nanocrystalline materials with particles diameter range from 80 nm to 500 nm (depending on the doping method). From optical experiments, it was possible to observe changes in absorbance spectra, which are probably related to interfacial charge transfer and the localized surface plasmon resonance phenomenon.

show abstract

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

“…To achieve this goal, it is necessary to dope pure TiO 2 with metal ions (Pt, Pd, Au, Ag, Ta, Zr, Cu, Nd, Ni, Fe, Cr, V, Mn, Co, Pb, Ce, W etc.) [26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

2016

View full text Add to dashboard Cite

show abstract

Hydrothermal synthesis of a two‐dimensional g‐C₃N₄/MoS₂/MnOOH composite material and its potential application as photocatalyst

Jiménez-Rangel

Lartundo‐Rojas

García‐García

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: Environmental pollution and energy crisis are nowadays considered among the most important problems facing humanity. Several strategies have been proposed to solve them, being photocatalysis a very promising one because of its ease of application and low cost. In the search for active photocatalysts, those based on graphite-like carbon nitride (g-C 3 N 4 ) are becoming good alternatives for various reactions. In this work, the properties of g-C 3 N 4 /MoS 2 /MnOOH composite material and its photocatalytic behavior for the production of hydrogen (H 2 ) under UV radiation were investigated. RESULTS:The composite material was synthesized by applying a combination of thermal condensation and hydrothermal methods. According to the results of X-ray diffraction (XRD), ultraviolet diffuse reflectance spectroscopy (UV-DRS), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM), good dispersion of the phases and the formation of a heterojunction were observed. The band gap value of the composite material, calculated by the Kubelka-Munk equation using the values obtained from UV-DRS analysis, was lower than those of the individual components, while it also had a much longer electron-hole recombination time, according to photoluminescence analysis. As a consequence of a synergistic effect, the activity of the proposed composite photocatalyst was superior in the reaction of water splitting, with a kinetic constant of 466 mol h −1 and a production rate of 1750 mol H 2 g −1 cat h −1 (50 and 21% higher than those obtained with MoS 2 and g-C 3 N 4 , respectively). CONCLUSION: Because of its high activity and stability, g-C 3 N 4 /MoS 2 /MnOOH composite photocatalyst is an excellent alternative for H 2 production by the water splitting reaction. REFERENCES1 Sun H and Wang S, Research advances in the synthesis of nanocarbon-based photocatalysts and their applications for photocatalytic conversion of carbon dioxide to hydrocarbon fuels. Energy Fuels 28:22-36 (2014).

show abstract

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

Yener

Helvacı

2015

Appl. Phys. A

View full text Add to dashboard Cite

Rutile TiO 2 nanoparticles, in different structural and morphological properties, were produced by the hydrolysis of titanium tetrachloride in a highly acidic reaction media at moderate temperatures without calcination. Their photocatalytic activities were investigated in the liquid-phase degradation of terephthalic acid under visible light illumination. The parameters, which are the concentration of the titanium tetrachloride solution (0.1-1 M) and reaction temperature (60-95°C), effective on the properties of the particles, and their photocatalytic performances, were investigated. The XRD patterns indicated a pure rutile crystal structure at moderate temperatures without need of calcination. The FEGSEM images showed the formation of flower-, pinecone-, and sphere-like clusters consisting of interconnected nanofibers. The N 2 adsorption-desorption isotherms pointed out the microporous structure of the clusters. Band gap energies were found to be varying between 3.02 and 3.08 eV due to the well-developed rutile crystallite structure. Systematic studies elucidated that the optimum reactant concentration and reaction temperature are 0.5 M TiCl 4 and 95°C, respectively. The rutile clusters synthesized at the optimum reaction conditions exhibited 99 % of the photocatalytic degradation of TPA under visible light illumination at shorter irradiation times compared with commercial P25 TiO 2 .

show abstract

Preparation and visible-light photocatalytic activity of Au- and Cu-modified TiO2 powders

Cited by 44 publications

References 22 publications

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Hydrothermal synthesis of a two‐dimensional g‐C₃N₄/MoS₂/MnOOH composite material and its potential application as photocatalyst

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

Contact Info

Product

Resources

About

Preparation and visible-light photocatalytic activity of Au- and Cu-modified TiO2 powders

Cited by 44 publications

References 22 publications

Optical Properties of TiO2Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Optical Properties of TiO2Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Hydrothermal synthesis of a two‐dimensional g‐C3N4/MoS2/MnOOH composite material and its potential application as photocatalyst

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

Contact Info

Product

Resources

About

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

Hydrothermal synthesis of a two‐dimensional g‐C₃N₄/MoS₂/MnOOH composite material and its potential application as photocatalyst