Comparison of photocatalytic activities of two kinds of lead magnesium niobate for decomposition of organic compounds under visible-light irradiation

2007 ◽  
Vol 22 (9) ◽  
pp. 2590-2597 ◽  
Author(s):  
Tetsuya Kako ◽  
Jinhua Ye
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Organic Compounds ◽  
Visible Light Irradiation ◽  
Band Gaps ◽  
Lead Magnesium Niobate ◽  
Light Irradiation ◽  
Photocatalytic Activities ◽  
Lead Magnesium ◽  
First Time

Two new oxide photocatalysts in the Pb–Mg–Nb ternary system, Pb3MgNb2O9 (PMN) and Pb1.83Mg0.29Nb1.71O6.39, have been synthesized, and their photophysical and photocatalytic properties were investigated for the first time. The band gaps of PMN and Pb1.83Mg0.29Nb1.71O6.39 were estimated to be 3.2 and 2.8 eV, respectively, from their absorption spectra. The photocatalytic activity evaluated from the decomposition of 2-propanol into acetone under visible-light irradiation indicated that Pb1.83Mg0.29Nb1.71O6.39 exhibited at least 20 times higher activity than PMN and has a strong oxidizing potential to mineralize organic compounds.

Enhanced Photocatalytic Performance of Iodine Doped Bi2WO6 Nanostructures under Visible-Light Irradiation

2013 ◽  
Vol 423-426 ◽  
pp. 163-166 ◽  
Author(s):  
Bao Wei Cao ◽  
Yun Hua Xu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Absorption Spectra ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
Red Shift ◽  
Light Irradiation ◽  
Photocatalytic Activities

Bi2WO6 doped with iodine ions were synthesized using hydrothermal method and their photocatalytic activities to degrade Rhodamine B (RhB) under visible-light was investigated. The successful incorporation of I ions in Bi2WO6 was proved by XRD and XPS. UV-vis absorption spectra results show that I ion was successfully doped into Bi2WO6 and a red shift for I-doped Bi2WO6 appeared when compared to pure Bi2WO6. The photocatalytic activities of the photocatalysts were evaluated by the decolorization of RhB under visible-light irradiation. The results showed that the photocatalytic activity of I-doped Bi2WO6 was much higher than the undoped Bi2WO6.

Controllable Synthesis and Photocatalytic Activity of Ba0.6Mg0.4TiO3 Particles with Different Morphologies

2014 ◽  
Vol 955-959 ◽  
pp. 2267-2275 ◽  
Author(s):  
Rong Liu ◽  
Shi Duo Zhao ◽  
Xue Lin
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Hydrothermal Process ◽  
Light Irradiation ◽  
Photocatalytic Properties ◽  
X Ray Diffraction ◽  
Photocatalytic Activities ◽  
Uv Visible ◽  
Xrd Patterns

Ba0.6Mg0.4TiO3 (BMT) particles with different morphologies were synthesized through hydrothermal method and their optical and photocatalytic properties were investigated. Their crystal structure and microstructures were characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). XRD patterns demonstrate that the as-prepared samples are tetragonal structure. FESEM shows that BMT crystals can be fabricated in different morphologies by simply manipulating the reaction parameters of hydrothermal process. The UV-visible diffuse reflectance spectra (UV-vis DRS) reveal that the band gaps of BMT photocatalysts are about 2.37 - 2.51 eV. The as-prepared BMT photocatalysts exhibite higher photocatalytic activities in the degradation of methyl orange (MO) under visible light irradiation (λ > 420 nm) compared with traditional N-doped TiO2 (N-TiO2) and pure BaTiO3 (BTO). The high photocatalytic performance of BMT photocatalysts could be attributed to the recombination restraint of the e-/h+ pairs resulting from doping of Mg2+ ions. The influence of morphologies upon the photocatalytic properties of BMT was studied. Furthermore, BMT nanowires reveal the highest photocatalytic activity. Up to 94.0% MO is decolorized after visible light irradiation for 360 min.

Fabrication of novel g-C3N4/nanocage ZnS composites with enhanced photocatalytic activities under visible light irradiation

CrystEngComm ◽  
2014 ◽  
Vol 16 (21) ◽  
pp. 4485-4492 ◽  
Author(s):  
Jing Wang ◽  
Peng Guo ◽  
Qiangsheng Guo ◽  
Pär G. Jönsson ◽  
Zhe Zhao
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Composite Photocatalyst ◽  
Photocatalytic Activities

In the present work, the g-C3N4/nanocage ZnS composite photocatalyst was fabricated and the photocatalytic activity was enhanced under visible-light irradiation.

Novel one-dimensional Bi2O3–Bi2WO6 p–n hierarchical heterojunction with enhanced photocatalytic activity

2014 ◽  
Vol 2 (22) ◽  
pp. 8517-8524 ◽  
Author(s):  
Yin Peng ◽  
Mei Yan ◽  
Qing-Guo Chen ◽  
Cong-Min Fan ◽  
Hai-Yan Zhou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Organic Compounds ◽  
Visible Light Irradiation ◽  
Electrostatic Field ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Junction Region ◽  
One Dimensional ◽  
Photogenerated Electrons

A novel Bi2O3–Bi2WO6 p–n junction photocatalyst exhibits high photocatalytic activity for the degradation of organic compounds under solar/visible light irradiation, which is ascribed to the effective separation of photogenerated electrons and holes by the internal electrostatic field in the junction region.

Investigation of structure and photocatalytic activity on TiO2 hybridized with graphene: compared to CNT case

RSC Advances ◽  
2015 ◽  
Vol 5 (79) ◽  
pp. 64414-64420 ◽  
Author(s):  
ShuaiNan Guo ◽  
JinChen Fan ◽  
QunJie Xu ◽  
YuLin Min
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Photocatalytic Activities

The structures of TiO2 hybridized with graphene by three different method were studied and their corresponding photocatalytic activities was compared by degrading RhB under UV and visible light irradiation.

ZnO–graphene composites with high photocatalytic activities under visible light

RSC Advances ◽  
2016 ◽  
Vol 6 (99) ◽  
pp. 96778-96784 ◽  
Author(s):  
Junli Xu ◽  
Ya Cui ◽  
Yide Han ◽  
Men Hao ◽  
Xia Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Corrosion Process ◽  
Light Irradiation ◽  
Chemical Corrosion ◽  
Photocatalytic Activities

Porous ZnO–graphene composites prepared by a chemical corrosion process show good photocatalytic activity under visible light irradiation.

Synthesis of AgBr/Bi2WO6 Heterojunction with Enhanced Photocatalytic Activities for Methyl Orange

2014 ◽  
Vol 953-954 ◽  
pp. 1139-1142 ◽  
Author(s):  
Dan Jun Wang ◽  
Xiao Mei He ◽  
Li Guo ◽  
Feng Fu ◽  
Lin Lin Yue
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Deposition Process ◽  
Light Irradiation ◽  
Photocatalytic Activities

AgBr nanoparticle decorated mesoporous Bi2WO6 architectures was fabricated via a facile precipitation-deposition process. As-prepared AgBr/Bi2WO6 heterojunction was characterized by XRD, FE-SEM and HR-TEM. The photocatalytic activities of the samples were evaluated by the photodegradation of methyl orange (MO) under visible light irradiation. The results showed that AgBr nanoparticles decrodation great improved the photocatalytic activity of Bi2WO6. The 2.0at%AgBr/Bi2WO6 sample exhibited the best photocatalytic activity for decolorization of MO.Furthermore, the mechanism of enhanced photocatalytic activity for hierarchical AgBr/Bi2WO6 heterojunction was also discussed.

The Preparation of NiO/BiVO4 Composite Photocatalyst and its Enhanced Photocatalytic Activities

2015 ◽  
Vol 727-728 ◽  
pp. 42-46
Author(s):  
Pei Pei Yi ◽  
Xiang Zhai ◽  
Xiao Ming Gao ◽  
Feng Fu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Energy Dispersive Spectrometer ◽  
Bathochromic Shift ◽  
Diffuse Reflectance Spectrum ◽  
Light Irradiation ◽  
Visible Range ◽  
Photocatalytic Activities

The NiO/BiVO4 composite photocatalysts were synthesized by hydrothermal method and were characterized by powder X-ray diffraction(XRD),scanning electron microscope (SEM), UV-vis diffuse reflectance spectrum(UV-vis DRS), Energy Dispersive Spectrometer (EDS), BET techniques. The photocatalytic activities were determined by oxidative decomposition of methyl orange in aqueous solution under visible light irradiation. The results showed that the light absorption of the NiO/BiVO4 became higher in the visible range compared to pure BiVO4, meantime, accompanied by a bathochromic shift of the absorption edge. The photocatalytic activities were evaluated by the photodegradation of Methyl Orange under visible light irradiation. The results showed that NiO loaded evidently improved the photocatalytic activity of BiVO4, and loaded amount had a different impact on the catalytic activity of BiVO4, The 20%NiO/BiVO4 which exhibited the favorable photocatalytic activity in the photodegradation of Methyl Orange.

Synthesis of Bi2O3/Ag3Po4 Composites and their Photocatalytic Activities under Visible Light Irradiation

2015 ◽  
Vol 1112 ◽  
pp. 163-167 ◽  
Author(s):  
Uyi Sulaeman ◽  
Estri Yunari ◽  
Ponco Iswanto ◽  
Shu Yin ◽  
Tsugio Sato
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Body Centered Cubic ◽  
Bet Specific Surface Area ◽  
Photocatalytic Activities ◽  
Co Precipitation ◽  
Rhodamin B

The Bi2O3/Ag3PO4 composites consisting of the monoclinic α-Bi2O3 and body-centered cubic Ag3PO4 were successfully synthesized by grinding Ag3PO4 and Bi2O3 mixtures in ethanol using an agate mortar, followed by calcination at 500°C for 5 hours, where the Ag3PO4 was synthesized by co-precipitation method using AgNO3 and NaH2PO4.2H2O as starting materials. The Bi2O3 content in the composite materials changed from 5 to 25 mol.%. The composites were characterized using XRD, DRS and BET specific surface area. The photocatalytic activities were evaluated using Rhodamin B degradation under visible light irradiation of blue LED (λ = 445 nm). The highest photocatalytic activities could be obtained at 5 mol.% Bi2O3 in Bi2O3/Ag3PO4 composite. The enhanced photocatalytic activity could be attributed to the effective separation of hole (h+) and electron (e-) pairs in the Bi2O3/Ag3PO4 composite.

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