scholarly journals Enhanced Photocatalytic Property of Cu Doped Sodium Niobate

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Jianbin Xu ◽  
Feng Zhang ◽  
Bingyang Sun ◽  
Yingge Du ◽  
Guoqiang Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Adsorption Property ◽  
Photocatalytic Property ◽  
Complex Method ◽  
Polymer Complex ◽  
Sodium Niobate ◽  
Modified Polymer ◽  
Light Excitation ◽  
The Fourier Transform

We investigate the photocatalytic activity of Cu doped NaNbO3powder sample prepared by the modified polymer complex method. The photocatalytic activity of hydrogen evolution from methanol aqueous solution was improved by Cu 2.6 at% doping. The photocatalytic degradation of rhodamine B (RhB) under visible light irradiation was enhanced in comparison with pristine NaNbO3. Cu introduction improved the adsorption property of NaNbO3, judging from the Fourier transform infrared spectra. Moreover, the ultraviolet light excitation in Cu doped sample would accelerate the mineralized process.

scholarly journals Facile Synthesis and Photocatalytic Property of Titania/Carbon Composite Hollow Microspheres with Bimodal Mesoporous Shells

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Guohong Wang ◽  
Bei Cheng ◽  
Jun Zhang ◽  
Lin Xu ◽  
Tingting Yin
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Hollow Spheres ◽  
Photocatalytic Property ◽  
Nitrogen Adsorption ◽  
Carbon Composite ◽  
Hollow Microspheres ◽  
Calcination Time ◽  
One Pot ◽  
Pore Structures

Titania/carbon composite hollow microspheres with bimodal mesoporous shells are one-pot fabricated by hydrothermal treatment of the acidic (NH4)2TiF6aqueous solution in the presence of glucose at180∘C for 24 h and then calcined at450∘C. The as-prepared samples were characterized by XRD, SEM, TEM, HRTEM, UV-visible spectroscopy, and nitrogen adsorption-desorption isotherms. The photocatalytic activity of the as-prepared samples was evaluated by daylight-induced photocatalytic decolorization of methyl orange aqueous solution at ambient temperature. The effects of calcination time on the morphology, phase structure, crystallite size, specific surface area, pore structures, and photocatalytic activity of the microspheres were investigated. The results indicated that the as-obtained TiO2/C composite hollow spheres generally exhibit bimodal mesopore size distribution with their peak intra-aggregated mesopore size in the range of 2.3–4.5 nm and peak interaggregated mesopore size in the range of 5.7–12.7 nm, depending on specific calcination time. The daylight-induced photoactivity of as-obtained hollow TiO2/C microspheres generally exceeds that of Degussa P25. The influences of calcination time on the photoactivity are discussed in terms of carbon content, phase structures, and pore structures.

Preparation and characterization of visible light sensitive Fe- and Ta-codoped TiO2 photocatalyst

2010 ◽  
Vol 25 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Tetsuya Kako ◽  
Weifeng Yao ◽  
Jinhua Ye
Keyword(s):  
Photocatalytic Activity ◽  
Solid State ◽  
Visible Light ◽  
Complex Method ◽  
Polymer Complex ◽  
Optical Absorption Spectra ◽  
Tio2 Photocatalyst ◽  
Yellow Color ◽  
Organic Decomposition

Titania (TiO2) was modified by codoping of Fe3+ and Ta5+ to absorb visible light. The codoped titania [(Fe,Ta)xTi1–xO2, 0 ≤ x ≤ 1] were prepared by a solid state reaction or by the polymer complex method. With increased codoping, the optical absorption spectra are red-shifted and the color ranges from white to brown via yellow. Also, the codoped titania (0 < x ≤ 0.05) possesses photocatalytic activity for organic decomposition under visible light irradiation. The codoped titania (x = 0.01) with yellow color shows the highest activity among the codoped titania (0 ≤ x ≤ 1) and a higher activity than the 1% Fe3+-doped TiO2 with orange brown color.

Structural and Optical Properties of CeO2 Nanoparticles Synthesized by Modified Polymer Complex Method

2019 ◽  
Vol 29 (3) ◽  
pp. 813-826 ◽  
Author(s):  
Jazmín Calvache-Muñoz ◽  
Fabiola A. Prado ◽  
Liliana Tirado ◽  
Lucy Caterine Daza-Gomez ◽  
Germán Cuervo-Ochoa ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ceo2 Nanoparticles ◽  
Complex Method ◽  
Polymer Complex ◽  
Structural And Optical Properties ◽  
Modified Polymer

Effect of Samarium on the Photocatalytic Property of Sm-TiO2/CNFs Composites

2009 ◽  
Vol 79-82 ◽  
pp. 541-544 ◽  
Author(s):  
Li Ying Zhu ◽  
Xiao Ping Yang ◽  
Dong Hua Teng ◽  
Yun Hua Yu
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Carbon Nanofibers ◽  
Uv Irradiation ◽  
Photocatalytic Property ◽  
Uniform Size ◽  
Degradation Of Methyl Orange

Composites of Sm doped TiO2 nanoparticles dispersed on carbon nanofibers (Sm-TiO2/CNFs) with different Sm contents were prepared by preoxidation, hydrolyzation and calcination of Sm-TiO2 precursor/PAN nanofibers. The characterizations of SEM, EDX, XPS and XRD showed that the CNFs surface was loaded by Sm-TiO2 nanoparticles with a uniform size of about 10nm, existing as anatase. It was concluded from XPS results that Ti element exist as Ti4+ and Sm doping increased the content of absorbed oxygen in composites. The effect of Sm doping on the photocatalytic activity of the Sm-TiO2/CNFs composite was investigated by the photocatalytic degradation of methyl orange aqueous solution under UV irradiation. It was found that Sm doping could improve the photocatalytic property of Sm-TiO2/CNFs effectively compared with the undoped specimen, and the photocatalytic activity of the Sm-TiO2/CNFs samples enhanced firstly and then reduced with Sm content increasing.

scholarly journals Perovskites (La,Ba)(Fe,Ti)O3: AO7 photocatalysis under visible light

2020 ◽  
Vol 59 (1) ◽  
pp. 151-159 ◽  
Author(s):  
Ana Sofia Rodrigues ◽  
Maria Estrela Melo Jorge ◽  
Lurdes Ciríaco ◽  
Maria José Pacheco ◽  
Ana Lopes
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Annealing Temperature ◽  
Synthesis Methods ◽  
Complex Method ◽  
Polymer Complex ◽  
Ceramic Method ◽  
Annealing Conditions ◽  
Good Crystallinity ◽  
Catalytic Material

AbstractPerovskites BaTiO3, La0.1Ba0.9TiO3 and BaFeO3 were prepared by different methods and utilized as photo-catalytic material for the degradation of the AO7 dye, with visible light. The toxicity of the treated solutions and the toxicity of perovskite powders that remained in suspension after centrifuged was assessed.Different catalytic properties were found by changing synthesis methods, annealing conditions, temperature of assay, initial concentration of pollutant and amount of perovskite in suspension. BaTiO3 was prepared by ceramic or complex polymerization methods. This perovskite presents cubic structure, and the preparation method do not seem to have any influence on the unit cell parameter. On the other hand, annealing temperature has a marked influence on the time needed to attain good crystallinity. In the case of BaFeO3 prepared by the ceramic method, for low annealing temperature there is the formation of tetragonal phase, which changes to hexagonal with the increase in annealing temperature, being a Ba2Fe2O5 monoclinic phase involved in this phase transition.Regarding AO7 photocatalytic degradation, the best results, with almost complete colour removal, were obtained with BaFeO3 (97%), prepared by ceramic method, and with BaTiO3 (78%), prepared by polymer complex method. Toxicity assays towards Daphnia magna were performed with AO7 25 ppm aqueous solution samples, collected in the centrifuged suspensions of the photocatalytic assays, performed with different perovskites, and samples collected in centrifuged suspensions of perovskite powders. In general, there is no increase in toxicity when compared to the toxicity of an AO7 25 ppm aqueous solution. Only in the photodegradation assay with BaFeO3 a clear increase in toxicity was observed, indicating that toxic by-products are being formed.

Synthesis and Photocatalytic Property of TiO2 Particles Preparated in the Solvothermal Method

2011 ◽  
Vol 121-126 ◽  
pp. 453-457
Author(s):  
Li Qin Wang ◽  
Xiu Li Zhao ◽  
Xiang Ni Yang ◽  
Yang Han ◽  
Rui Jun Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Solvothermal Method ◽  
Hysteresis Loops ◽  
Photocatalytic Property ◽  
Average Pore ◽  
Good Thermal Stability ◽  
Tio2 Particles ◽  
Adsorption Desorption

The TiO2 particles were synthesized in the solvothermal method, and they were characterized by the means of scanning electron microscopy (SEM), X-ray powder diffraction (XRD), thermogravimetric analysis and differential thermal analysis (TG-DTA) and the N2 adsorption–desorption measurement. The photocatalytic property of as-prepared TiO2 particles was evaluated by the degradation experiment of methyl orange aqueous solution. Results indicated that TiO2 nanoparticles were the combination of anatase-TiO2 and rutile-TiO2 crystals with integrated crystals form and high crystallinity, which may be helpful for stabilizing the anatase and improving the photocatalytic activity. The adsorption-desorption isotherms was the typical type IV isotherm with a clear H2-type hysteresis loops in the desorption branch. The results showed mesoporous TiO2 particles had the average pore diameter of 3.587 nm, the average specific surface areas of 270.342 m2/g, and the average pore volume of 0.259 cm3/g. Meantime, the as-prepared TiO2 particles had good thermal stability and high photocatalytic activity, when being irradiated for 120 min, the degradation rate of the methyl orange aqueous solution could be up to 98.27%.

Use of Nanopillars-TiO2 Thin Films in the Photocatalytic Degradation of Bromophenol Blue from Aqueous Solution

2018 ◽  
Vol 6 (1) ◽  
pp. 22-30
Author(s):  
C. Lalhriatpuia ◽  
◽  
Thanhming liana ◽  
K. Vanlaldinpuia
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Batch Reactor ◽  
Bromophenol Blue ◽  
Tio2 Thin Films ◽  
Initial Concentration ◽  
Bet Specific Surface Area ◽  
Interfering Ions

The photocatalytic activity of Nanopillars-TiO2 thin films was assessed in the degradation of Bromophenol blue (BPB) dye from aqueous solution under batch reactor operations. The thin films were characterized by the XRD, SEM and AFM analytical methods. BET specific surface area and pore sizes were also obtained. The XRD data showed anatase phase of TiO2 particles with average particle size of 25.4 and 21.9 nm, for S1 and S2 catalysts respectively. The SEM and AFM images indicated the catalyst composed with Nanosized pillars of TiO2, evenly distributed on the surface of the substrate. The average height of the pillars was found to be 180 and 40 nm respectively for the S1 and S2 catalyst. 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 BPB using the UV light was studied at wide range of physico-chemical parametric studies to determine the mechanism of degradation as well as the practical applicability of the technique. The batch reactor operations were conducted at varied pH (pH 4.0 to 10.0), BPB initial concentration (1.0 to 20.0 mg/L) and presence 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 BPB. The maximum percent removal of BPB was observed at pH 6.0 and a low initial concentration of the pollutant highly favours the photocatalytic degradation using thin films. The presence of several interfering ions suppressed the photocatalytic activity of thin films to some extent. The time dependence photocatalytic degradation of BPB was demonstrated with the pseudo-first-order rate kinetics. Study was further extended with total organic carbon measurement using the TOC (Total Organic Carbon) analysis. This demonstrated an apparent mineralization of BPB from aqueous solutions.

scholarly journals Sulfur-doped CoFe2O4 nanopowders for enhanced visible-light photocatalytic activity and magnetic properties

RSC Advances ◽  
2017 ◽  
Vol 7 (80) ◽  
pp. 50546-50554 ◽  
Author(s):  
Rong Li ◽  
Chencen Sun ◽  
Jia Liu ◽  
Qiang Zhen
Keyword(s):  
Aqueous Solution ◽  
Magnetic Properties ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Photocatalytic Activity ◽  
Magnetic Recovery ◽  
Visible Light Photocatalytic

Magnetic recovery S-CoFe2O4 nanopowders showed excellent visible photocatalytic degradation of oxytetracycline and recycling performances in aqueous solution.

scholarly journals Fabrication of TiO2/Fe2O3/CdS systems: effects of Fe2O3 and CdS content on superior photocatalytic activity

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 10300-10308
Author(s):  
Hui Feng ◽  
Siqi Feng ◽  
Niu Tang ◽  
Songbai Zhang ◽  
Xiangyang Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Organic Pollutants ◽  
High Performance ◽  
Low Cost

New idea for the low cost synthesis of high performance photocatalysts for the photodegradation of organic pollutants in aqueous solution.

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