Facile hydrothermal synthesis of ultrasmall W18O49 nanoparticles and studies of their photocatalytic activity towards degradation of methylene blue

2017 ◽  
Vol 188 ◽  
pp. 1-7 ◽  
Author(s):  
Bishal Bhuyan ◽  
Bappi Paul ◽  
Siddhartha Sankar Dhar ◽  
Sethumathavan Vadivel
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis

Hydrothermal Synthesis and Photocatalytic Activities of La-Doped BiVO4 Microcakes

2014 ◽  
Vol 881-883 ◽  
pp. 177-180
Author(s):  
Guo Cong Liu ◽  
Shi Hua Xu ◽  
Yin Jian Liang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Absorption Band ◽  
Visible Light Irradiation ◽  
Hydrothermal Route ◽  
Monoclinic Crystal ◽  
Photocatalytic Activities ◽  
Template Free ◽  
La Doped

Novel La-doped BiVO4microcakes have been hydrothermally synthesized and characterized by XRD, XPS, SEM, and DRS techniques.The results reveal that the well crystallized and cake-like Bi0.95La0.05VO4monoclinic crystal with the diameter range of 15 μm and the width range of 0.2-0.8 μm can be obtained via a template-free hydrothermal route. Compared with pure BiVO4microcakes, Bi0.95La0.05VO4microcake shows a little red shift in the absorption band, resulting in a narrowed band gap (2.37 eV), which has the better photocatalytic activity with a 98.6 % degradation of methylene blue (MB) with a concentration of 10 mg/L under visible-light irradiation for 60 min.

Hydrothermal synthesis of bismuth vanadate-alumina assisted by microwaves to evaluate the photocatalytic activity in the degradation of methylene Blue

2020 ◽  
Vol 353 ◽  
pp. 126-133 ◽  
Author(s):  
Rocío Magdalena Sánchez-Albores ◽  
Bianca Yadira Pérez-Sariñana ◽  
C.A. Meza-Avendaño ◽  
P.J. Sebastian ◽  
Odín Reyes-Vallejo ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Bismuth Vanadate

scholarly journals Hydrothermal Synthesis of (001) Facet Highly Exposed ZnO Plates: A New Insight into the Effect of Citrate

Crystals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 552 ◽  
Author(s):  
Shirui Luo ◽  
Ruosong Chen ◽  
Lan Xiang ◽  
Jing Wang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Growth Mechanism ◽  
Zno Nanoparticles ◽  
Hydrothermal Route ◽  
One Step ◽  
Synthesis Routes ◽  
First Time ◽  
Insight Into

In this work, two synthesis routes were applied to investigate the effect of citrates on the construction of the ZnO structure. Well-dispersed ZnO plates with (001) facet highly exposed were prepared via one-step hydrothermal route, while ZnO nanoparticles were obtained via two-step route. In one-step route, citrates were added before the formation of Zn(OH)2 precursor, while citrates were added after the formation of Zn(OH)2. For the first time, the interaction between citrates and the Zn(OH)2 precursor was investigated and citrates that participated in the formation of Zn(OH)2 were the main cause for (001) facet exposed structure construction. A growth mechanism about the formation of ZnO plates in the presence of citrates was proposed. The as-prepared ZnO plates showed enhanced photocatalytic activity for the degradation of methylene blue (MB).

Hydrothermal Synthesis of Bi4Ti3O12/TiO2 Composite

2016 ◽  
Vol 697 ◽  
pp. 109-112
Author(s):  
Wei Zhao ◽  
Nian Qi Liu ◽  
Hong Xing Wang ◽  
Yu Bo Zhang ◽  
Shi Meng Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Scan Electron Microscopy ◽  
Raw Material ◽  
Molar Ratio ◽  
Hydrothermal Processing ◽  
X Ray Diffraction ◽  
X Ray

A hydrothermal processing technology was employed to synthesize Bi4Ti3O12/TiO2 composite by using TiO2 and Bi(NO3)3 as reactor precursors, and KOH as mineralizer. The microstructure and composition of the as-synthesized samples were characterized by X-ray diffraction (XRD), scan electron microscopy (SEM), and the photocatalytic activity was studied. The results showed that Bi/Ti molar ratio, mass of the KOH and the hydrothermal parameters play important roles on the morphology and activities of the photocatalyst. We could obtain composites with good morphology and better performance with 200 °C hydrothermal treatment for 12 h, 0.01 mol/L of KOH, and 1:2 of mole ratio of Bi/Ti, as well as using good crystalline TiO2 as the raw material. The as-prepared powder has a diameter of about 800nm, and the decolorized rate of methylene blue could reach 95 % after the UV-irradiation for 5 h.

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.

scholarly journals Highly Porous and Ultra-Lightweight Aero-Ga2O3: Enhancement of Photocatalytic Activity by Noble Metals

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1985
Author(s):  
Irina Plesco ◽  
Vladimir Ciobanu ◽  
Tudor Braniste ◽  
Veaceslav Ursaki ◽  
Florian Rasch ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Noble Metals ◽  
Hybrid Structures ◽  
Blue Dye ◽  
Light Illumination ◽  
Methylene Blue Dye ◽  
Visible Light Illumination ◽  
New Type ◽  
Highly Porous

A new type of photocatalyst is proposed on the basis of aero-β-Ga2O3, which is a material constructed from a network of interconnected tetrapods with arms in the form of microtubes with nanometric walls. The aero-Ga2O3 material is obtained by annealing of aero-GaN fabricated by epitaxial growth on ZnO microtetrapods. The hybrid structures composed of aero-Ga2O3 functionalized with Au or Pt nanodots were tested for the photocatalytic degradation of methylene blue dye under UV or visible light illumination. The functionalization of aero-Ga2O3 with noble metals results in the enhancement of the photocatalytic performances of bare material, reaching the performances inherent to ZnO while gaining the advantage of the increased chemical stability. The mechanisms of enhancement of the photocatalytic properties by activating aero-Ga2O3 with noble metals are discussed to elucidate their potential for environmental applications.

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