Highly UV light driven WOx@ZnO nanocomposites synthesized by liquid impregnation method

2017 ◽  
Vol 46 ◽  
pp. 119-129 ◽  
Author(s):  
Myo Thuya Thein ◽  
Jia Ern Chim ◽  
Swee-Yong Pung ◽  
Yuh-Fen Pung
Keyword(s):  
Uv Light ◽  
Impregnation Method ◽  
Liquid Impregnation

scholarly journals The Puncture and Water Resistance of Polyurethane- Impregnated Fabrics after UV Weathering

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 15
Author(s):  
Antonella Patti ◽  
Domenico Acierno
Keyword(s):  
Experimental Data ◽  
Uv Radiation ◽  
Water Resistance ◽  
Uv Light ◽  
Crosslinking Agent ◽  
Waterborne Polyurethane ◽  
Impregnation Method ◽  
Polyurethane Dispersion ◽  
Spectroscopic Analyses ◽  
Before And After

Polyurethane is a polymer adaptable to different scientific and industrial requirements; nevertheless it is also extremely susceptible to UV radiation, which compromises the physical and mechanical functionality. In this framework, our study investigated the effect of waterborne polyurethane dispersion (WPUD) applied to a polyester (PET)-based fabric, through the impregnation method, on the puncturing and water resistance of the pristine material, before and after UV weathering. Results confirmed an increment of both features in the prepared fabrics, attributed to the PUR textile treatment; but a partially loss of the gained properties in the samples due to the UV weathering. In order to improve the efficiency of the impregnating dispersions, in protecting the durability of the treated materials, the addition of different UV light stabilizers, or/and of crosslinking agent into WPUD was also tested. From the experimental data, it can be concluded that formulations based on WPUD, containing both the crosslinker and UV organic absorber, have displayed an increment of their perforation and water resistance for the treated samples with respect to the starting textile, and contemporary have preserved the features against the UV light. Finally, microscopic and spectroscopic analyses have been performed as further characterization techniques of the samples surface.

Photocatalytic Removal of 2,4-D Herbicide on Lanthanum Oxide-Modified Titanium Dioxide

2015 ◽  
Vol 1112 ◽  
pp. 168-171
Author(s):  
Wai Ruu Siah ◽  
Nur Azmina Roslan ◽  
Hendrik O. Lintang ◽  
Mustaffa Shamsuddin ◽  
Leny Yuliati
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Inductively Coupled Plasma ◽  
Lanthanum Oxide ◽  
Electrochemical Impedance ◽  
Uv Light ◽  
Photogenerated Electron ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Impregnation Method

Titanium dioxide (TiO2) has been recognized as an active photocatalyst for degradation of various organic pollutants. In this study, in order to improve the photocatalytic activity of TiO2, the effect of lanthanum oxide modification was investigated by using commercial P25 as the benchmark. Lanthanum oxide/P25 TiO2 composites with 0.1, 0.5, 1 and 5 mol% of La loadings were prepared via an impregnation method. The resultant composites were characterized by X-ray diffraction (XRD), UV-Vis absorption spectroscopy, transmission electron microscopy (TEM), inductively coupled plasma optical emission spectrometry (ICP-OES) and electrochemical impedance spectroscopy (EIS). It was confirmed that the addition of lanthanum oxide did not much affect the crystallinity, crystal structure and the morphology of P25 TiO2. The catalytic activities of the lanthanum oxide/P25 TiO2 catalysts were tested by using 2,4-dichlorophenoxyacetic acid (2,4-D) as the test pollutant and UV light as the irradiation source. The reaction was caried out for 1 hour at room temperature and the percentage removal was determined using a UV spectrophotometer. The results showed that La loading was an important factor that influenced the photocatalytic activity of the composites. After 1 hour reaction, the best catalyst with 0.1 mol% of La loading showed 24% higher photocatalytic activity than the unmodified P25 TiO2 catalyst. It is shown by EIS that the enhanced photocatalytic activity of the composites was due to the ability of lanthanum oxide in improving the charge separation of the photogenerated electron-hole pairs in TiO2.

scholarly journals Synthesis of Silver-Doped Titanium TiO2Powder-Coated Surfaces and Its Ability to InactivatePseudomonas aeruginosaandBacillus subtilis

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Saman Khan ◽  
Ishtiaq A. Qazi ◽  
Imran Hashmi ◽  
M. Ali Awan ◽  
Najum-us-Sehar Sadaf Zaidi
Keyword(s):  
Visible Spectrum ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Environmental Surfaces ◽  
Liquid Impregnation ◽  
Doped Titanium Dioxide ◽  
Normal Light ◽  
Nanoparticle Coatings ◽  
Coated Surfaces

Hard, nonporous environmental surfaces in daily life are now receiving due recognition for their role in reducing the spread of several nosocomial infections. In this work, we established the photokilling effects of 1% silver-doped titanium dioxide TiO2. The nanoparticles synthesized by liquid impregnation method were characterized using X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and scanning electron microscopy (SEM). The Ag-TiO2nanoparticle coatings that have been applied on glass and venetian blind surfaces were effective in generating a loss of viability of two bacteria (Pseudomonas aeruginosaandBacillus subtilis) after two hours of illumination under normal light in the visible spectrum. Such surfaces can be applicable to medical and other facilities where the potential for infection should be controlled.

scholarly journals Cobalt Oxide-Modified Titanium Dioxide Nanoparticle Photocatalyst for Degradation of 2,4-Dichlorophenoxyacetic Acid

2017 ◽  
Vol 17 (2) ◽  
pp. 284 ◽  
Author(s):  
Leny Yuliati ◽  
Nur Azmina Roslan ◽  
Wai Ruu Siah ◽  
Hendrik Oktendy Lintang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Cobalt Oxide ◽  
Uv Light ◽  
Dichlorophenoxyacetic Acid ◽  
Photocatalytic Reaction ◽  
Impregnation Method ◽  
Titanium Dioxide Nanoparticle ◽  
2,4 Dichlorophenoxyacetic Acid

2,4-dichlorophenoxyacetic acid (2,4-D) has been recognized as a possibly carcinogenic compound to human, therefore, 2,4-D should be treated before it is discharged to the environment. Photocatalytic degradation of 2,4-D has been proposed as one of the best methods that offer environmentally safe process. In the present research, titanium dioxide (TiO2) was modified with cobalt oxide (CoO) and tested for photocatalytic degradation of 2,4-D under UV light irradiation. Different amounts of CoO (0.1, 0.5, 1 and 5 mol%) were added onto TiO2 by an impregnation method. The photocatalytic reaction was monitored and analyzed by measurement of 2,4-D absorbance using UV spectrophotometer. After 1 h photocatalytic reaction, it was confirmed that the sample with low loading of 0.1 mol% gave the highest photocatalytic activity among the bare and modified TiO2 photocatalysts. The photocatalytic activity was decreased with the increase of CoO loading, suggesting that the optimum amount of CoO was an important factor to improve the performance of TiO2. Based on fluorescence spectroscopy, such addition of CoO resulted in the reduced emission intensity, which showed the successful decrease in the electron-hole recombination.

Synthesis of Hybrid Cu-Doped TiO2 Photocatalyst for Dye Removal

2019 ◽  
Vol 797 ◽  
pp. 84-91 ◽  
Author(s):  
Ying Pei Lim ◽  
Ying Chin Lim
Keyword(s):  
Incubation Time ◽  
Incubation Temperature ◽  
Dye Degradation ◽  
Uv Light ◽  
Light Irradiation ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Wet Impregnation Method

Titanium dioxide (TiO2) photocatalyst is one of the promising semiconductors used for the degradation of commercial dyes. However, it has to be doped with other metals to increase its efficiency, reactivity and stability. This study was carried out to synthesize hybrid Cu-doped TiO2 using wet impregnation method by varying the loading of copper precursor (0.3-1.0 wt%), incubation temperature (50-90°C) and incubation time (1-24 h). The synthesized hybrid Cu-doped TiO2 was characterized using XRD, EDX, FESEM and BET to obtain the structural, elemental, and surface morphological information. The photocatalytic activities of the synthesized Cu-doped TiO2 were investigated for the degradation of methyl orange (MO) under UV-light irradiation. The results revealed that the optimum Cu loading was at 0.5wt% Cu with incubation temperature of 50°C and 2h incubation time. The hybrid Cu-doped TiO2 showed an excellent dye degradation efficiency ranging from 40-82% under UV-light irradiation.

Platinum Reduction Study on Pt/C Electro-catalysts for PEMFC

2013 ◽  
Vol 16 (3) ◽  
pp. 141-145
Author(s):  
M.L. Hernandez-Pichardo ◽  
R. Gonzalez-Huerta ◽  
P. del Angel ◽  
E. Palacios-Gonzalez ◽  
M. Tufiño-Velazquez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Uv Light ◽  
Reducing Agents ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Conditions ◽  
Platinum Species ◽  
Scanning Electron

Platinum reduction on Pt/C catalysts was studied on samples prepared by the impregnation method using different Pt precursors and reducing agents such as ethanol, sodium borohydride and ethanol-UV light (photo-assisted reduction), in order to compare the efficiency of the different reducing agents. The influence of the reduction level of the platinum species on the electrochemical behavior of these catalysts has been determined. The catalysts were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and linear and cyclic voltammetry. The results show that the reduction level depends mainly on the platinum precursor. Moreover, it was found that the higher electrochemical activity was found using catalysts reduced with ethanol, whereas by using NaBH4 as the reducing agent, the total reduction of the platinum precursor is very difficult in same synthesis conditions. The analysis of the XPS results shows that samples reduced with ethanol presented the lower PtOx/Pt reduction ratio.

scholarly journals TiO2Nanocatalysts Supported on a Hybrid Carbon-Covered Alumina Support: Comparison between Visible Light and UV Light Degradation of Rhodamine B

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Mphilisi M. Mahlambi ◽  
Ajay K. Mishra ◽  
Shivani B. Mishra ◽  
Rui W. Krause ◽  
Bhekie B. Mamba ◽  
...  
Keyword(s):  
Visible Light ◽  
Rhodamine B ◽  
Uv Light ◽  
Reaction Rate Constant ◽  
Titania Nanoparticles ◽  
Impregnation Method ◽  
Alumina Support ◽  
Photodegradation Efficiency ◽  
Carbon Covered Alumina ◽  
Hybrid Carbon

Titania nanoparticles were successfully supported on carbon-covered alumina (CCA) supports via the impregnation method to form carbon-covered alumna titania (CCA/TiO2). The CCA supports were synthesised through an equilibrium adsorption of toluene 2,4-diisocyante where the N=C=O irreversibly adsorbs on the alumina and pyrolysis at 700°C affords CCA supports. These CCA/TiO2nanocatalysts were tested for their photocatalytic activity both under UV and visible light using Rhodamine B as a model pollutant. The reaction rate constant of the CCA/TiO2was found to be higher than that of unsupported titania and the reaction kinetics were found to follow an apparent first-order rate law. The CCA/TiO2nanocatalysts had a much larger surface area than the unsupported titania and they exhibited overall higher photodegradation efficiency under both UV and visible light than unsupported TiO2.

scholarly journals Feasibility of Macroporous CeO2 Photocatalysts for Removal of Lead Ions from Water

2018 ◽  
Vol 13 (2) ◽  
pp. 256 ◽  
Author(s):  
Takuya Nozaki ◽  
Ryo Shoji ◽  
Yasukazu Kobayashi ◽  
Kazunori Sato
Keyword(s):  
Uv Light ◽  
Light Irradiation ◽  
Lead Ions ◽  
Bet Surface Area ◽  
Impregnation Method ◽  
Zinc Ions ◽  
Hard Template ◽  
Ion Exchange Reaction ◽  
Uv Light Irradiation ◽  
Coupling Approach

Removal of lead ions from water was conducted by a coupling approach of adsorption and photoelectrodeposition over a macroporous CeO2 photocatalyst loaded with ZnO. The photocatalyst was prepared by the hard template method and the impregnation method. The various size of silica spheres (0.05-0.4 µm) were used as a template for the photocatalyst, and the highest BET surface area (73.8 m2/g) was given in the sample prepared with the smallest silica sphere (0.05 µm). In the removal of lead ions, the porous sample showed a large amount of removal of lead ions. In addition, the ZnO loaded catalysts showed a larger amount of removal for lead ions than an unloaded catalyst under the UV light irradiation. In the reaction, since zinc ions were simultaneously dissolved to the solution, it was suggested that this reaction was the ion-exchange reaction between lead ions and zinc ions and was promoted by the UV light irradiation. Copyright © 2018 BCREC Group. All rights reservedReceived: 21st March 2017; Revised: 31st November 2017; Accepted: 8th December 2017; Available online: 11st June 2018; Published regularly: 1st August 2018How to Cite: Nozaki, T., Shoji, R., Kobayashi, Y., Sato, K. (2018). Feasibility of Macroporous CeO2 Photocatalysts for Removal of Lead Ions from Water. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (2): 256-261 (doi:10.9767/bcrec.13.2.1020.256-261) 

Facile synthesis of a novel nitrogen-doped carbon dot adorned zinc oxide composite for photodegradation of methylene blue

2020 ◽  
Vol 49 (48) ◽  
pp. 17725-17736
Author(s):  
Raji Atchudan ◽  
Thomas Nesakumar Jebakumar Immanuel Edison ◽  
Shanmugam Mani ◽  
Suguna Perumal ◽  
Rajangam Vinodh ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Uv Light ◽  
Blue Dye ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Carbon Dot ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon ◽  
Wet Impregnation Method

Nitrogen-doped carbon dot decorated zinc oxide nanoparticles were successfully fabricated by an economical wet-impregnation method and used as a photocatalyst for the degradation of aqueous methylene blue dye under UV-light at room temperature.

Z-Scheme over all Water Splitting on Rh/K4Nb6O17 Nanosheets Photocatalyst

2016 ◽  
Vol 99 ◽  
pp. 3-8
Author(s):  
Hsin Yu Lin ◽  
Yu Lin Ye
Keyword(s):  
Water Splitting ◽  
Photoelectron Spectroscopy ◽  
Uv Light ◽  
Practical Importance ◽  
Proton Exchange ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray

Developing a photocatalysis system to generate hydrogen from water is a topic of great interest for fundamental and practical importance. In this study, hydrogen production by a new Z-scheme photocatalysis water splitting system was examined over Rh modified K4Nb6O17 nanosheets and Pt/WO3 photocatalysts for H2 evolution and O2 evolution with I-/IO3- electron mediator under UV light irradiation. The H2 evolution photocatalyst, Rh/K4Nb6O17 nanosheets with a slit like framework, was prepared by exfoliation of and proton exchange reaction. Pt/WO3 prepared by incipient-wetness impregnation method was used as O2 evolution photocatalyst. The catalysts were characterized by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy analysis (XPS), and ultraviolet-visible spectroscopy (UV-vis). These catalysts characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible spectroscopy (UV-Vis). In this study, we developed a facile method of preparing K4Nb6O17 nanosheets containing Rh nanoparticles. Our results show that I- concentration and pH of reaction solution significantly influenced the photocatalytic activity. The combination of Rh modified K4Nb6O17 nanosheets with Pt/WO3 achieves a very high photoactivity (H2: 4240 O2: 1622 (μmol g-1 h-1)).

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