The effect of Ag, Au, Pt, and Pd on the surface properties, photocatalytic activity and toxicity of multicomponent TiO2-based nanomaterials

2020 ◽  
Vol 7 (11) ◽  
pp. 3557-3574
Author(s):  
Anna Malankowska ◽  
Alicja Mikołajczyk ◽  
Joanna Mędrzycka ◽  
Izabela Wysocka ◽  
Grzegorz Nowaczyk ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Properties ◽  
Rational Design ◽  
Photocatalytic Properties ◽  
Air Purification ◽  
Component Concentration

A better understanding how to the component concentration, photocatalytic properties and toxicity of multicomponent TiO2-based nanomaterials (NMs) may lead to rational design of new and safe NMs with wide application in air purification.

Cuprous Oxide Films Deposition by Mid-Frequency Magnetron Sputtering and Their Photocatalytic Activity under Visible Light

NANO ◽  
2021 ◽  
Author(s):  
Z. X. Mu ◽  
H. Li ◽  
X. N. Deng
Keyword(s):  
Photocatalytic Activity ◽  
Magnetron Sputtering ◽  
Visible Light ◽  
Cuprous Oxide ◽  
Deposition Time ◽  
Visible Region ◽  
Mixed Phase ◽  
Photocatalytic Properties ◽  
Oxygen Flow ◽  
Photocatalytic Films

Cuprous oxide (Cu2O) has attracted much attention as a photocatalytic material. In this paper, the mid-frequency reactive magnetron sputtering method was used to prepare Cu2O films on glass slides, and the effects of oxygen flow and deposition time on the structures, morphologies and photocatalytic properties of the films were studied. The results show that the films prepared by this method have smooth surfaces and good absorptivity in the visible region. As the oxygen flow increases, the films transit from the mixed-phase of Cu and Cu2O to the single-phase of Cu2O. When the oxygen flow continues to increase, the films change to a mixed-phase of Cu4O3 and Cu2O. The photocatalytic decolorization of methyl orange under visible light irradiation conditions was used to assess the photocatalytic properties of the prepared films. When the oxygen flow is 6[Formula: see text]sccm and the deposition time is 15[Formula: see text]min, the film exhibits the best photocatalytic activity. Finally, the Mulliken electronegativity theory was used to explain the photocatalytic mechanism of Cu2O. This study confirmed the feasibility of preparing Cu2O photocatalytic films by magnetron sputtering, and provided the experimental basis for the subsequent study of Cu2O photocatalytic films.

Structure, morphology features and photocatalytic properties of α-Ag2WO4 nanocrystals-modified Palygorskite clay

2021 ◽  
Vol 02 ◽  
Author(s):  
Amanda Carolina Soares Jucá ◽  
Francisco Henrique Pereira Lopes ◽  
Herbert Vieira Silva-Júnior ◽  
Lara Kelly Ribeiro Silva ◽  
Elson Longo ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Dye Degradation ◽  
Degradation Kinetics ◽  
Low Cost ◽  
Catalytic Efficiency ◽  
Photocatalytic Properties ◽  
Impregnation Method ◽  
Heat Treated ◽  
Modified Palygorskite

Aims: In the present study, we investigate the photocatalytic properties of α-Ag2WO4 nanocrystals-modified Palygorskite (PAL) clay synthesized by the impregnation method. The PAL clay was chemically purified and heat-treated (500 ºC for 2 h), which served as an excellent supporting matrix for loading α-Ag2WO4(α-AWO) nanocrystals. Background: Water contamination is one of the most serious problems affecting human health, ecosystem survival, and the economic growth of societies. Industrial effluents, such as textile dyes, when not treated and improperly discharged into water resources are considered the main cause of water pollution. Thus the scientific community has been developing effective remediation technologies based on advanced oxidative processes to reduce the harmful effects of these organic pollutants. Objective: Improve the photocatalytic activity of PAL clay with α-AWO nanocrystals to degradation of Rhodamine B (RhB) dye. Methods: We purify and heat-treated the PAL clay, synthesize nanocrystals ofα-AWO nanocrystals and modify PAL clay with 30% α-AWO nanocrystals by the impregnation method. The modified PAL clay was able to improve RhB dye degradation. The materials were characterized by XRD, RAMAN,FE-SEM, FT-IR, XRF, etc. The samples were used as photocatalysts under UV-C lamps for the degradation of RhB dye in order to analyze its catalytic performances. Results: ThePAL clay modified with 30% α-AWO nanocrystals showed a catalytic efficiency of 79%, and degradation kinetics about 16 times higher when compared to PAL-500 only purified and heat-treated at 500 ºC. In this way, this PAL-modified is an alternative as a low-cost photocatalyst for the degradation of RhB dye. Conclusion: Ultraviolet-Visiblespectra revealed that our materials have opticalband gap energies controlled by indirect and direct electronic transitions and suitable to be activated under ultraviolet illumination. The adequate amount (30 wt.%) of α-Ag2WO4 nanocrystals added to PAL brought significant improvement of photocatalytic activity for the degradation of rhodamine B. Finally, a photocatalytic mechanism was proposed in detail.

scholarly journals Surface properties, adherence, and photocatalytic activity of sol–gel dip-coated TiO2–ZnO films on glass plates

2019 ◽  
Vol 22 (5) ◽  
pp. 393-405 ◽  
Author(s):  
Hamid Kazemi Hakki ◽  
Somaiyeh Allahyari ◽  
Nader Rahemi ◽  
Minoo Tasbihi
Keyword(s):  
Photocatalytic Activity ◽  
Surface Properties ◽  
Sol Gel ◽  
Zno Films ◽  
Glass Plates

Controlling the morphology and composition of Ag/AgBr hybrid nanostructures and enhancing their visible light induced photocatalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (60) ◽  
pp. 54709-54717 ◽  
Author(s):  
Aasim Shahzad ◽  
Taekyung Yu ◽  
Woo-Sik Kim
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Hybrid Nanostructures ◽  
Photocatalytic Properties

Ag/AgBr hybrid nanostructures were prepared by reducing AgBr nanoparticles synthesized by reaction of Ag+ with Br−. The Ag/AgBr hybrid nanostructures exhibited enhanced photocatalytic activity and recyclability for decomposing methylene blue (MB).

Synthesis, Structure, Optic and Photocatalytic Properties of Anatase/Brookite Nanocomposites

2020 ◽  
Vol 64 ◽  
pp. 39-48
Author(s):  
Volodymyr Moklyak ◽  
Volodymyr Chelyadyn ◽  
Andrii Hrubiak ◽  
Bogdan Ostafiychuk ◽  
Volodymyr Kotsyubynsky ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Hydrothermal Treatment ◽  
Classical Method ◽  
Hydrolysis Product ◽  
Photocatalytic Properties ◽  
Average Particle ◽  
Oxide Material ◽  
Buffer Solution ◽  
Vis Spectroscopy

Anatase/brookite nanocomposites were fabricated by the classical method of hydrolysis, additionally using hydrothermal treatment of preformed titanium dioxide sol with tetrabutyl orthotitanate. The influence of hydrothermal processing the buffer solution of TiO2 synthesis on the average particle sizes, specific surface area, pore sizes distributions, optical and photocatalytic properties investigated by X-ray diffraction, low-temperature nitrogen adsorption and UV-Vis spectroscopy. It has been determined that the hydrothermal treatment of pre-prepared titania sol as hydrolysis product leads to rutile formation after annealing at 400°C. Respective model of forming anatase/brookite/rutile nanocomposites was proposed. The changes of bang gap energy of TiO2 were observed and explained by effect of change phase composition and particles size of nanocomposite particles. Methylene blue (MB) photo-oxidation reactions using titanium dioxide nanocomposite were analyzed. Maximal photocatalytic activity of MB oxidation was detected for material with the ratio of the titania phases (anatase : brookite : rutile – 2 : 2 : 1). Synergistic effect between crystallinity, phase ratio, morphology of oxide material, band gap and photocatalytic activity in the anatase/brookite nanocomposites was established.

UV photocatalytic activity of Au@ZnO core–shell nanostructure with enhanced UV emission

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65595-65599 ◽  
Author(s):  
Tingting Jiang ◽  
Xueying Qin ◽  
Ye Sun ◽  
Miao Yu
Keyword(s):  
Electron Transfer ◽  
Photocatalytic Activity ◽  
Photocatalytic Properties ◽  
Core Shell ◽  
Shell Nanostructures ◽  
Uv Emission

Au@ZnO core–shell nanostructures with increased ultraviolet photoluminescence emissions present remarkably enhanced ultraviolet photocatalytic properties, based on bidirectional electron transfer between Au and ZnO.

Photocatalytic properties of Bi/BiOCl heterojunctions synthesized using an in situ reduction method

2014 ◽  
Vol 38 (10) ◽  
pp. 4913-4921 ◽  
Author(s):  
Jiajia Hu ◽  
Guangqing Xu ◽  
Jinwen Wang ◽  
Jun Lv ◽  
Xinyi Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Reduction Method ◽  
Uv Light ◽  
Photocatalytic Properties ◽  
In Situ Reduction ◽  
Light Activity ◽  
Bi Nanoparticles

Bi nanoparticles on BiOCl nanosheets, synthesized via in situ reduction, enhance the UV light photocatalytic activity and achieve visible light activity.

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