Synthesis of samarium- and nitrogen-co-doped TiO2 by modified hydrothermal method and its photocatalytic performance for the degradation of 4-chlorophenol

Huang, Donggen; Liao, Shih‐Chieh; Zhou, Wenwu; Quan, Shuiqing; Liu, L.; He, Zong Jian; Wan, Jinbao

doi:10.1016/j.jpcs.2009.04.005

Cited by 116 publications

(45 citation statements)

References 15 publications

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“…Delivery system based on lyo/Tre for BMP-2 dose reduction which were attributed to the bending mode of OH and the stretching vibration of surface hydroxyl and absorbed water, 38 indicating that no water molecules existed on the surface of TiO 2 -Lyo-Tre-BMP-2 nanotubes. These may be attributed to the lyophilization process.…”

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confidence: 99%

Dose reduction of bone morphogenetic protein-2 for bone regeneration using a delivery system based on lyophilization with trehalose

Zhang¹,

Yu²,

Wang³

et al. 2018

IJN

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Introduction To induce sufficient new bone formation, high doses of bone morphogenetic protein-2 (BMP-2) are applied in regenerative medicine that often induce serious side effects. Therefore, improved treatment strategies are required. Here, we investigate whether the delivery of BMP-2 lyophilized in the presence of trehalose reduced the dose of BMP-2 required for bone regeneration. Materials and methods A new growth factor delivery system was fabricated using BMP-2-loaded TiO 2 nanotubes by lyophilization with trehalose (TiO 2 -Lyo-Tre-BMP-2). We measured BMP-2 release characteristics, bioactivity, and stability, and determined the effects on the osteogenic differentiation of bone marrow stromal cells in vitro. Additionally, we evaluated the ability of this formulation to regenerate new bone around implants in rat femur defects by micro-computed tomography (micro-CT), sequential fluorescent labelling, and histological analysis. Results Compared with absorbed BMP-2-loaded TiO 2 nanotubes (TiO 2 -BMP-2), TiO 2 -Lyo-Tre-BMP-2 exhibited sustained release, consistent bioactivity, and higher stability of BMP-2, and resulted in greater osteogenic differentiation of BMSCs. Eight weeks post-operation, TiO 2 -Lyo-Tre-BMP-2 nanotubes, with various dosages of BMP-2, regenerated larger amounts of new bone than TiO 2 -BMP-2 nanotubes. Conclusion Our findings indicate that delivery of BMP-2 lyophilized with trehalose may be a promising method to reduce the dose of BMP-2 and avoid the associated side effects.

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confidence: 99%

Dose reduction of bone morphogenetic protein-2 for bone regeneration using a delivery system based on lyophilization with trehalose

Zhang¹,

Yu²,

Wang³

et al. 2018

IJN

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“…The O 1s peak was clearly seen at the binding energy of 529.75 eV, suggesting the presence of Ti−O bonds. The N 1s peak at 396.17 eV points to the existence of Ti−N bonds and the N 1s peak at 399.09 eV may be an N−N, N−O, or N−C bond 3,7 . For Sm doping species, the Sm 4d peak was observed at 120.29 eV corresponding to a Sm−O−Ti bond 8,9 .…”

Section: Characterization Of Photocatalystsmentioning

confidence: 99%

“…This results in the reduction of photocatalytic efficiency of TiO 2 . Samarium (Sm) is a rare earth element widely used as a supporting catalyst due to its unique electronic configuration www.scienceasia.org (occupied 4f orbitals and empty 5d orbitals) [5][6][7][8] . The energy level of 4f orbitals of Sm 3+ is between the energy level of the valence and conduction bands of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The energy level of 4f orbitals of Sm 3+ is between the energy level of the valence and conduction bands of TiO 2 . Hence Sm can be used as a dopant to enhance the electronic transition and suppress the e --h + pair recombination [7][8][9] . Thermally stable Sm/N-codoped TiO 2 has been prepared using coprecipitation method in order to degrade salicylic acid under visible light irradiation.…”

Section: Introductionmentioning

confidence: 99%

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Sm/N-codoped TiO2 preparation, characterization, and photocatalytic decolourization of Acid Orange 7 and Basic Blue 41 in sunlight

Hirunpinyopas

Davis²,

Sirisaksoontorn³

et al. 2015

ScienceAsia

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ABSTRACT:A Sm/N-codoped TiO 2 photocatalyst was successfully prepared via a sol-gel method using ammonium hydroxide and samarium(III) acetylacetonate as nitrogen and samarium sources, respectively. The anatase phase of TiO 2 was mainly observed in a Sm/N-codoped product calcined at 500°C as indicated by the X-ray diffraction pattern. The crystallite size of Sm/N-codoped TiO 2 ranged from 6-10 nm with a surface area (S BET ) of 109-155 m 2 /g.Photoelectron spectroscopic results confirmed the incorporation of both Sm and N species into the TiO 2 structure, which substantially lowered the band gap energy of TiO 2 . The photocatalyst activities were evaluated by the ability to decolourize solutions containing the organic azo dyes (i.e., AO7 and BB41) in sunlight. Sm/N-codoped TiO 2 calcined at 500°C shows higher decolourization of AO7 than any other doped TiO 2 calcined at 500°C, including undoped TiO 2 . Interestingly, Sm-doped TiO 2 calcined at 400°C could most efficiently decolourize AO7. For the decolourization of BB41 dye, N-doped TiO 2 calcined at 500°C showed the highest photocatalytic efficiency.

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“…The N-TiO 2 [15], and S-TiO 2 [16] were studied for the photodegradations of methylene blue under UV/Visible light irradiation, while C-TiO 2 [17] was reported to be active for the degradation of phenol. The titania co-doped with rare earth metals and nitrogen are also reported to show an enhanced activity for the decomposition of pollutants [18,19]. Though doped TiO 2 catalysts were extensively investigated for the degradation of pollutants, comparatively fewer studies have been reported for photocatalytic hydrogen production [20][21][22].…”

mentioning

confidence: 99%

Enhanced photocatalytic hydrogen production from water–methanol mixture using cerium and nonmetals (B/C/N/S) co-doped titanium dioxide

Natarajan

2014

Mater Renew Sustain Energy

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In the present study, photocatalytic hydrogen production from water/methanol solution was investigated over cerium and nonmetal (B/C/N/S) co-doped titanium dioxide catalyst under visible light irradiation. The cerium and nonmetal co-doped titania photocatalysts were prepared by co-precipitation and characterized by surface area and pore size analysis, X-ray diffraction analysis, diffuse reflectance UV-Vis spectroscopy analysis, and photoluminescence analysis. The UV-Visible spectra showed that incorporation of cerium and nonmetals to TiO 2 resulted in narrow band gap and improved absorption of visible light. The band gap energy of co-doped samples depended on the properties of nonmetals. Photoluminescence studies showed that the radiative recombination rates of photogenerated electron-hole pairs were effectively suppressed by the addition of cerium and nonmetals and contributed to higher activity. The highest hydrogen production of 206 lmol/h was obtained for Ce-N-TiO 2 sample, which can be attributed to the higher surface area, higher absorption of visible light, and higher separation efficiency of electron-hole pairs in Ce-N-TiO 2 .

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Synthesis of samarium- and nitrogen-co-doped TiO2 by modified hydrothermal method and its photocatalytic performance for the degradation of 4-chlorophenol

Cited by 116 publications

References 15 publications

Dose reduction of bone morphogenetic protein-2 for bone regeneration using a delivery system based on lyophilization with trehalose

Dose reduction of bone morphogenetic protein-2 for bone regeneration using a delivery system based on lyophilization with trehalose

Sm/N-codoped TiO2 preparation, characterization, and photocatalytic decolourization of Acid Orange 7 and Basic Blue 41 in sunlight

Enhanced photocatalytic hydrogen production from water–methanol mixture using cerium and nonmetals (B/C/N/S) co-doped titanium dioxide

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