Nitrification of Nb-Modified Titanias Prepared by the Solvothermal Method and their Photocatalytic Activities under Visible-Light Irradiation

2013 ◽  
Vol 596 ◽  
pp. 43-49
Author(s):  
Shinnosuke Noguchi ◽  
Toru Tokutome ◽  
Shinji Iwamoto
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Oxygen Vacancies ◽  
Solvothermal Method ◽  
Thermal Reaction ◽  
Light Irradiation ◽  
Photocatalytic Decomposition ◽  
Titanium Tetraisopropoxide ◽  
Co Doped

Niobium modified titania samples were prepared by thermal reaction of titanium tetraisopropoxide and niobium pentaethoxide in 1,4-butanediol at 300 °C (solvothermal method), and the products were nitrified in an NH3 flow at 600 °C. The physicochemical property of the thus-obtained N-and Nb-co-doped titanias and visible-light response photocatalytic activity of FeOx-loaded N-and Nb-co-doped titanias were investigated. The N-and Nb-co-doped titanias had larger absorptions in the visible-light range as compared to the only N-doped titania samples. In ESR spectra of the Nb-modified TiO2 samples annealed at 300 °C after the nitrification, signals due to Ti3+ and oxygen vacancies, which accelerate the recombination of the photo-generated electrons and holes, were clearly observed. On the other hand, for the N-and Nb-co-doped titanias annealed at 500 °C, the signals due to Ti3+ and oxygen vacancies decreased significantly. Actually, the FeOx-loaded N-and Nb-co-doped samples annealed at 500 °C exhibited a higher photocatalytic activity for a photocatalytic decomposition of acetaldehyde under visible-light irradiation.

scholarly journals SOLVOTHERMAL SYNTHESIS OF BI2WO6 AND ITS PHOTOCATALYTIC ACTIVITY UNDER VISIBLE LIGHT IRRADIATION

2018 ◽  
Vol 54 (4B) ◽  
pp. 42
Author(s):  
Trinh Duy Nguyen
Keyword(s):  
Absorption Spectrum ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Solvothermal Synthesis ◽  
Solvothermal Method ◽  
Visible Region ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Different Temperatures

Flower-like Bi2WO6 were successfully synthesized using the solvothermal method at different temperatures and characterized by XRD, FE-SEM, and DRS. We also investigated the photocatalytic activity of Bi2WO6 for the decomposition of rhodamine B under visible light irradiation. From XRD and SEM results, the reaction temperature has significant effects on the morphologies of the samples. From DRS results, Bi2WO6 samples displayed the absorption spectrum up to the visible region and then they showed the high photocatalytic activity under visible light irradiation, as a comparison with TiO2-P25.

Ultrathin HNb3O8 nanosheets with oxygen vacancies for enhanced photocatalytic oxidation of amines under visible light irradiation

2019 ◽  
Vol 7 (10) ◽  
pp. 5493-5503 ◽  
Author(s):  
Junli Chen ◽  
Hai Wang ◽  
Zhiqiang Zhang ◽  
Lifeng Han ◽  
Yonghui Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Oxidation ◽  
Oxygen Vacancies ◽  
Hydrothermal Process ◽  
Light Irradiation ◽  
Excellent Photocatalytic Activity ◽  
Simple Hydrothermal Process

Ultrathin HNb3O8 nanosheets with oxygen vacancies were successfully synthesized by a simple hydrothermal process. HNb3O8 NSs showed excellent photocatalytic activity.

Novel Tm3+/Yb3+–co-doped Bi2MoO6: Synthesis, characterization, and enhanced photocatalytic activity under visible-light irradiation

2020 ◽  
Vol 35 (3) ◽  
pp. 312-320
Author(s):  
Zuowei Zhang ◽  
Hongshun Hao ◽  
Shanshan Jin ◽  
Yunxia Hou ◽  
Hongman Hou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Image Position ◽  
Co Doped

Abstract

A systemic study on Gd, Fe and N co-doped TiO2 nanomaterials for enhanced photocatalytic activity under visible light irradiation

2020 ◽  
Vol 46 (15) ◽  
pp. 24744-24752 ◽  
Author(s):  
Weichao Li ◽  
Linkun Xie ◽  
Liexing Zhou ◽  
Josias Ochoa-Lozano ◽  
Chen Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Doped Tio2 ◽  
Tio2 Nanomaterials ◽  
Co Doped

scholarly journals Synergistic Effect on Photocatalytic Activity of Co-Doped NiTiO3/g-C3N4 Composites under Visible Light Irradiation

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1332
Author(s):  
Duc Quang Dao ◽  
Thi Kim Anh Nguyen ◽  
Thanh-Truc Pham ◽  
Eun Woo Shin
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Electrochemical Impedance ◽  
Lattice Structure ◽  
Light Irradiation ◽  
X Ray ◽  
Co Doping ◽  
Composite Photocatalysts ◽  
Co Doped

Co-doped NiTiO3/g-C3N4 composite photocatalysts were prepared by a modified Pechini method to improve their photocatalytic activity toward methylene blue photodegradation under visible light irradiation. The combination of Co-doped NiTiO3 and g-C3N4 and Co-doping into the NiTiO3 lattice synergistically enhanced the photocatalytic performance of the composite photocatalysts. X-ray photoelectron spectroscopy results for the Co-doped NiTiO3/g-C3N4 composite photocatalysts confirmed Ti-N linkages between the Co-doped NiTiO3 and g-C3N4. In addition, characteristic X-ray diffraction peaks for the NiTiO3 lattice structure clearly indicated substitution of Co into the NiTiO3 lattice structure. The composite structure and Co-doping of the C-x composite photocatalysts (x wt % Co-doped NiTiO3/g-C3N4) not only decreased the emission intensity of the photoluminescence spectra but also the semicircle radius of the Nyquist plot in electrochemical impedance spectroscopy, giving the highest kapp value (7.15 × 10−3 min−1) for the C-1 composite photocatalyst.

scholarly journals Synergetic Effect of In and Ag Co-Doped ZnS for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

2014 ◽  
Vol 1024 ◽  
pp. 368-371 ◽  
Author(s):  
Melody Kimi ◽  
Leny Yuliati ◽  
Mustaffa Shamsuddin
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Light Absorption ◽  
Synergetic Effect ◽  
Band Gap Energy ◽  
Light Irradiation ◽  
Efficient Charge ◽  
Co Doped

In and Ag co-doped ZnS photocatalysts were successfully prepared by hydrothermal method to extend the light absorption of ZnS to the visible light region. The concentration of In was constant while for Ag was varied to optimize the photocatalytic activity. The In and Ag co-doped ZnS photocatalysts showed smaller band gap energy compared to single doped In (0.1)-ZnS and undoped ZnS. The photocatalytic activity of In and Ag co-doped ZnS photocatalysts was evaluated from the amount of hydrogen produced. The hydrogen evolution rate from aqueous solution containing Na2SO3 and Na2S as sacrificial reagent under visible light irradiation obtained from In and Ag co-doped ZnS is higher compared to the single doped In (0.1)-ZnS when optimum amount of Ag dopant was added. The highest photocatalytic activity is observed for In (0.1),Ag (0.01)-ZnS with hydrogen production rate of 26.82 μmol/h. The higher performance of this photocatalyst is ascribed to the extended visible light absorption, efficient charge separation as well as improved electron transfer associated with synergistic effect of appropriate amount of In and Ag co-doped ZnS.

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