Highly-active direct Z-scheme Si/TiO2 photocatalyst for boosted CO2 reduction into value-added methanol

RSC Advances ◽  
2014 ◽  
Vol 4 (100) ◽  
pp. 56961-56969 ◽  
Author(s):  
Yousong Liu ◽  
Guangbin Ji ◽  
Mohammed Abdulkader Dastageer ◽  
Lei Zhu ◽  
Junyi Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Reaction ◽  
Co2 Reduction ◽  
Value Added ◽  
High Photocatalytic Activity ◽  
Tio2 Photocatalyst ◽  
Highly Active

Si/TiO2 heterojunction photocatalyst was synthesized via a facile hydrothermal reaction and exhibits high photocatalytic activity towards conversion of CO2 to methanol.

Synthesis of Bi2WO6/g-C3N4 photocatalyst and high degradation of Rhodamine B under visible light irradiation

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wenjie Wang ◽  
Mengran Zhang ◽  
Binxia Zhao ◽  
Linxue Liu ◽  
Ruixuan Han ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Hydrothermal Reaction ◽  
Active Species ◽  
High Photocatalytic Activity ◽  
Rapid Separation ◽  
Content Type ◽  
Photogenerated Electrons ◽  
Molecular Substances ◽  
Photocatalytic Material

Purpose The purpose of this paper is to improve the degradation efficiency of Rhodamine B (RhB) by new photocatalytic materials. Design/methodology/approach Binary Z-scheme g-C3N4/Bi2WO6 photocatalytic material was synthesized by the one-step hydrothermal reaction. The construction of Z-scheme heterojunction led to the rapid separation of photogenerated electrons and holes, which would degrade RhB into small molecular substances to achieve the purpose of degradation. Findings It was found that Bi2WO6/25%g-C3N4 displayed the highest photocatalytic activity, which was about 1.44 and 1.34 times higher than that of pure Bi2WO6 and g-C3N4, respectively. According to the trapping experiments, the superoxide radical (·O2−) was the major active species of the RhB decomposition in Bi2WO6/g-C3N4 catalysts. Originality/value The successful synthesis of Z-scheme Bi2WO6/g-C3N4 provides new ideas and references for the design of catalysts with high photocatalytic activity, which should have wide applications in the future.

scholarly journals Preparation and Characterization of Defective TiO2. The Effect of the Reaction Environment on Titanium Vacancies Formation

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2763
Author(s):  
Zuzanna Bielan ◽  
Szymon Dudziak ◽  
Agnieszka Sulowska ◽  
Daniel Pelczarski ◽  
Jacek Ryl ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Hydrothermal Reaction ◽  
High Photocatalytic Activity ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Light Activity ◽  
Cheap Alternative

Among various methods of improving visible light activity of titanium(IV) oxide, the formation of defects and vacancies (both oxygen and titanium) in the crystal structure of TiO2 is an easy and relatively cheap alternative to improve the photocatalytic activity. In the presented work, visible light active defective TiO2 was obtained by the hydrothermal reaction in the presence of three different oxidizing agents: HIO3, H2O2, and HNO3. Further study on the effect of used oxidant and calcination temperature on the physicochemical and photocatalytic properties of defective TiO2 was performed. Obtained nanostructures were characterized by X-ray diffractometry (XRD), specific surface area (BET) measurements, UV-Vis diffuse reflectance spectroscopy (DR-UV/Vis), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) spectroscopy. Degradation of phenol as a model pollutant was measured in the range of UV-Vis and Vis irradiation, demonstrating a significant increase of photocatalytic activity of defective TiO2 samples above 420 nm, comparing to non-defected TiO2. Correlation of EPR, UV-Vis, PL, and photodegradation results revealed that the optimum concentration of HIO3 to achieve high photocatalytic activity was in the range of 20–50 mol%. Above that dosage, titanium vacancies amount is too high, and the obtained materials’ photoactivity was significantly decreased. Studies on the photocatalytic mechanism using defective TiO2 have also shown that •O2− radical is mainly responsible for pollutant degradation.

Facile hydrothermal synthesis of NaTaO3 with high photocatalytic activity

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940046 ◽  
Author(s):  
Min Yen Yeh ◽  
Jun Hong Li ◽  
Shun Hsyung Chang ◽  
Shiow Yueh Lee ◽  
Huichun Huang
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Perovskite Structure ◽  
Hydrothermal Reaction ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Orthorhombic Perovskite

Orthorhombic perovskite structure NaTaO3 with cube shape was successfully synthesized by hydrothermal reaction. The as-prepared NaTaO3 behaves a great photocatalystic activity on degradation of MB solution not only under UV but also visible light irradiation.

scholarly journals Highly Active Rare-Earth-Metal La-Doped Photocatalysts: Fabrication, Characterization, and Their Photocatalytic Activity

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
S. Anandan ◽  
Y. Ikuma ◽  
V. Murugesan
Keyword(s):  
Photocatalytic Activity ◽  
High Surface ◽  
Sol Gel ◽  
Earth Metal ◽  
High Photocatalytic Activity ◽  
Highly Active ◽  
Photocatalytic Activities ◽  
Doped Zno ◽  
Photonic Efficiency ◽  
La Doped

Efficient La-doped TiO2photocatalysts were prepared by sol-gel method and extensively characterized by various sophisticated techniques. The photocatalytic activity of La-doped TiO2was evaluated for the degradation of monocrotophos (MCPs) in aqueous solution. It showed higher rate of degradation than pure TiO2for the light of wavelength of 254 nm and 365 nm. The rate constant of TiO2increases with increasing La loading and exhibits maximum rate for 1% La loading. The photocatalytic activities of La-doped TiO2are compared with La-doped ZnO; the reaction rate of the former is ~1.8 and 1.1 orders higher than the latter for the lights of wavelength 254 nm and 365 nm, respectively. The relative photonic efficiency of La-doped TiO2is relatively higher than La-doped ZnO and commercial photocatalysts. Overall, La-doped TiO2is the most active photocatalyst and shows high relative photonic efficiencies and high photocatalytic activity for the degradation of MCP. The enhanced photocatalytic activity of La-doped TiO2is mainly due to the electron trapping by lanthanum metal ions, small particle size, large surface area, and high surface roughness of the photocatalysts.

Study of Cyclohexane Photooxidation over Pt-WO3 Catalysts Mixed with TiO2 under Visible Light Irradiation

2010 ◽  
Vol 658 ◽  
pp. 149-152 ◽  
Author(s):  
Yuichi Ichihashi ◽  
Shingo Saijo ◽  
Masaaki Taniguchi ◽  
Keita Taniya ◽  
Satoru Nishiyama
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Visible Light ◽  
Tungsten Oxide ◽  
Visible Light Irradiation ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Tio2 Photocatalyst ◽  
Physical Mixing ◽  
Platinum Loading

The photooxidation of cyclohexane to cyclohexanone, cyclohexanol and CO2 was carried out by visible light irradiation to tungsten oxide photocatalysts. The physical mixing of tungsten oxide and titanium oxide (WO3+TiO2) led to the high photocatalytic activity. It was speculated that the physical mixing of WO3 and TiO2 took place the charge transfer between WO3 and TiO2, and this inhibited the recombination between electrons and holes on the WO3 surface. The platinum loading on WO3 further developed the photocatalytic activity of WO3+TiO2 photocatalyst. Hence, the degree of the recombination between electrons and holes may dominate the photocatalytic activity of cyclohexane oxidation.

scholarly journals In situ preparation of oxygen-deficient TiO2 microspheres with modified {001} facets for enhanced photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (16) ◽  
pp. 9902-9907 ◽  
Author(s):  
Xiaogang Liu ◽  
Yingpu Bi
Keyword(s):  
Photocatalytic Activity ◽  
Reaction Time ◽  
Hydrothermal Reaction ◽  
Active Oxygen ◽  
In Situ Preparation ◽  
Synthetic Strategy ◽  
Highly Active ◽  
Tio2 Microspheres ◽  
Hydrothermal Reaction Time

A facile in situ synthetic strategy has been developed to prepare highly active oxygen-deficient anatase TiO2 microspheres single crystal with modified {001} faceted by simply controlling the hydrothermal reaction time.

Preparation of Novel TiO2-Silica Filter Photocatalyst Derived from Titanium Alkoxy-Diolate Precursor

2014 ◽  
Vol 617 ◽  
pp. 191-194
Author(s):  
Masaki Naijo ◽  
Akira Hasegawa ◽  
Noriyoshi Kakuta
Keyword(s):  
Photocatalytic Activity ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
High Photocatalytic Activity ◽  
Decomposition Rate Constant ◽  
Highly Active ◽  
A Value ◽  
Silica Fibers ◽  
Loading Amount ◽  
Solid Acidity

Commercially available TiO2 (Degussa, P-25) is well-known as a highly active photocatalyst. However, in order to work as a photocatalyst, TiO2 must be dispersed onto a substrate without any binders but this still remains very difficult. We thus attempted to develop a novel TiO2 system with high photocatalytic activity. TiO2 anchored silica fibers (TAS) were prepared by chemical vapor deposition using titanium (IV) ethoxide and 1,3-butanediol. The content of TiO2 in TAS was varied from 0.5 to 5 mass%. It was observed that the surface of TAS was covered with anatase TiO2 particles 5-10 nm in diameter. TAS shows higher activity at a lower loading amount compared to P-25. Measurement of the acetaldehyde decomposition rate constant of P-25 and TAS carrying 2 mass% of titanium oxide under ultraviolet irradiation showed a value for TAS that was 1.4 times that of P-25. TAS showed a solid acidity amount higher than the P-25 in NH3-TPD measurements. It was considered that some Si species from the silica fibers migrated into the TiO2 layer by calcination, increasing the solid acidity of TAS. As a result, the adsorption of acetaldehyde increased, and the photocatalyst activity improved.

Highly Active K2Ti6O13 Nanowires: Synthesis, Characterization and Photocatalytic Activity

2013 ◽  
Vol 662 ◽  
pp. 20-23 ◽  
Author(s):  
Yu Min Qi ◽  
Chun Xiang Cui ◽  
Jian Guo Xiao ◽  
Shuang Jin Liu ◽  
Bai Hui Ma
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Reaction Rate ◽  
Hydrothermal Reaction ◽  
Sol Gel ◽  
Decisive Role ◽  
Combined Method ◽  
Structure And Morphology ◽  
Highly Active

Novel K2Ti6O13 nanowires were successfully synthesized by a new method， that is sol-gel/ hydrothermal combined method. The crystal structure and morphology of the products were characterized by a series of methods including XRD, SEM, EDX and TEM. The results indicate that the products synthesized are K2Ti6O13 nanowires. The diameter is about 5nm, and its length is in the range of from a few micrometers to hundreds of micrometers. The TiO2 nanoparticles synthesized via a sol-gel method, as hydrothermal reaction precursors, play an important decisive role on the diameter of K2Ti6O13 nanowires and the hydrothermal reaction rate. Photocatalytic degradation of MB in presence of the K2Ti6O13 nanowires was compared with that in presence of the TiO2 nanoparticles. The results show that the nanowires have better photocatalytic activity.

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