Enhanced photocatalytic activity of Bi2WO6 doped with upconversion luminescence agent

2011 ◽  
Vol 13 (1) ◽  
pp. 31-34 ◽  
Author(s):  
Zhijie Zhang ◽  
Wenzhong Wang ◽  
Jie Xu ◽  
Meng Shang ◽  
Jia Ren ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Upconversion Luminescence

Enhanced photocatalytic activity and upconversion luminescence of flowerlike hierarchical Bi2MoO6 microspheres by Er3+ doping

2012 ◽  
Vol 27 (11) ◽  
pp. 1471-1475 ◽  
Author(s):  
Naiying Fan ◽  
Yajie Chen ◽  
Qingmao Feng ◽  
Cheng Wang ◽  
Kai Pan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Upconversion Luminescence ◽  
Image Position

Abstract

Enhancing near‐infrared photocatalytic activity and upconversion luminescence of BiOCl: Yb3+-Er3+ nanosheets with polypyrrole in-situ modification

2021 ◽  
Author(s):  
Youzhun Fan ◽  
Tianhui Wang ◽  
Yingying Zhang ◽  
Qibing Li ◽  
Zhijie Wu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rare Earth ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Absorption Enhancement ◽  
Rare Earth Ion ◽  
Photophysical Process ◽  
In Situ Modification ◽  
Light Conversion Efficiency

Photocatalytic behavior and upconversion (UC) luminescence of rare earth ion (RE) are two opposite photophysical process, but improving the ultimate light conversion efficiency, light absorption enhancement and suppression of excited...

Pure Green Upconversion Luminescence and Enhanced Photocatalytic Activity of Flower-like Hierarchical Bi2WO6∶Er3+Microspheres

2012 ◽  
Vol 33 (3) ◽  
pp. 263-268 ◽  
Author(s):  
范乃英 FAN Nai-ying ◽  
侯海鸽 HOU Hai-ge ◽  
冯清茂 FENG Qing-mao ◽  
李莹 LI Ying ◽  
陈亚杰 CHEN Ya-jie ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Upconversion Luminescence

Photocatalytic degradation of methylene blue from aqueous solutions using nanopillars-TiO2 thin films: Batch reactor studies

2018 ◽  
Vol 18 (3) ◽  
pp. 81-91 ◽  
Author(s):  
C. Lalhriatpuia
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Organic Carbon ◽  
Photocatalytic Degradation ◽  
Batch Reactor ◽  
Tio2 Thin Films ◽  
Initial Concentration ◽  
Bet Specific Surface Area ◽  
Interfering Ions

Nanopillars-TiO2 thin films was obtained on a borosilicate glass substrate with (S1) and without (S2) polyethylene glycol as template. The photocatalytic behaviour of S1 and S2 thin films was assessed inthe degradation of methylene blue (MB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the SEM, XRD, FTIR and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data confirmed that the TiO2 particles are in its anatase mineral phase. The SEM and AFM images indicated the catalyst is composed with nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The BET specific surface area and pore sizes of S1 and S2 catalyst were found to be 5.217 and 1.420 m2/g and 7.77 and 4.16 nm respectively. The photocatalytic degradation of MB was well studied at wide range of physico-chemical parameters. The effect of solution pH (pH 4.0 to 10.0) and MB initial concentration (1.0 to 10.0 mg/L) was extensively studied and the effect of several interfering ions, i.e., cadmium nitrate, copper sulfate, zinc chloride, sodium chloride, sodium nitrate, sodium nitrite, glycine, oxalic acid and EDTA in the photocatalytic degradation of MB was demonstrated. The maximum percent removal of MB was observed at pH 8.0 beyond which it started decreasing and a low initial concentration of the pollutant highly favoured the photocatalytic degradation using thin films and the presence of several interfering ions diminished the photocatalytic activity of thin films to some extent. The overall photocatalytic activity was in the order: S2 > S1 > UV. The photocatalytic degradation of MB was followed the pseudo-first-order rate kinetics. The mineralization of MB was studied with total organic carbon measurement using the TOC (total organic carbon) analysis.

Photocatalytic activity of TiO2 synthesized by anodization and anodic spark deposition

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3141-3152
Author(s):  
Alma C. Chávez-Mejía ◽  
Génesis Villegas-Suárez ◽  
Paloma I. Zaragoza-Sánchez ◽  
Rafael Magaña-López ◽  
Julio C. Morales-Mejía ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Surface Characteristics ◽  
Amorphous Solids ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalytic Activities ◽  
Anodic Spark Oxidation ◽  
Porous Surfaces ◽  
Scanning Electron

AbstractSeveral photocatalysts, based on titanium dioxide, were synthesized by spark anodization techniques and anodic spark oxidation. Photocatalytic activity was determined by methylene blue oxidation and the catalytic activities of the catalysts were evaluated after 70 hours of reaction. Scanning Electron Microscopy and X Ray Diffraction analysis were used to characterize the catalysts. The photocatalyst prepared with a solution of sulfuric acid and 100 V presented the best performance in terms of oxidation of the dye (62%). The electric potential during the synthesis (10 V, low potential; 100 V, high potential) affected the surface characteristics: under low potential, catalyst presented smooth and homogeneous surfaces with spots (high TiO2 concentration) of amorphous solids; under low potential, catalyst presented porous surfaces with crystalline solids homogeneously distributed.

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