Photocatalytic application of lithium doped cerium oxide nanoparticles upon UV light irradiation

2019 ◽  
Author(s):  
Surjeet Chahal ◽  
Neha Rani ◽  
Ashok Kumar ◽  
Parmod Kumar
Keyword(s):  
Cerium Oxide ◽  
Uv Light ◽  
Light Irradiation ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Uv Light Irradiation ◽  
Photocatalytic Application

scholarly journals Poly (Ethylene Glycol) Methyl Ether Methacrylate-Based Hydrogel and Cerium(IV) Oxide Nanoparticles as Ophthalmic Lens Material

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1111
Author(s):  
Min-Jae Lee ◽  
Seon-Young Park ◽  
A-Young Sung
Keyword(s):  
Ethylene Glycol ◽  
Physical Properties ◽  
Cerium Oxide ◽  
Methyl Ether ◽  
Uv Light ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Glycol Methyl Ether

The functional hydrogel lens containing 2-hydroxyethylmethacrylate (HEMA) was manufactured by thermal polymerization. The physical properties of the produced hydrogel lens were measured and analyzed. In this study, HEMA, ethylene glycol dimethacrylate (EGDMA), and azobisisobutyronitrile (AIBN) were used for thermal copolymerization. Additionally, poly (ethylene glycol) methyl ether methacrylate (PEGMEMA), 3-(Triethoxysilyl) propyl isocyanate (TEPI), and cerium(Ⅳ) oxide nanoparticles were used as additives to make a functional hydrogel lens. The mixture was heated at 100 °C for 90 min to produce the hydrogel ophthalmic lens by the cast mold method. The resulting physical properties showed that the water content and refractive index of the sample were in the ranges of 38.06~42.11% and 1.426~1.436, respectively. The addition of cerium oxide nanoparticles lowered the contact angle and allowed the hydrogel lens to block UV light. The tensile strength was also improved by 52.13% through cerium oxide nanoparticles, and up to 123.4% by using TEPI. Based on the results of this study, the produced ophthalmic lens is suitable for durable, UV-blocking high-performance lenses.

scholarly journals Fabrication and Characterization of Cobalt-Pigmented Anodized Zinc for Photocatalytic Application

2021 ◽  
Author(s):  
Judith Chebwogen ◽  
Christopher Mkirema Maghanga
Keyword(s):  
Methylene Blue ◽  
Water Treatment ◽  
Uv Light ◽  
Health Hazard ◽  
Solar Spectrum ◽  
Light Irradiation ◽  
Small Scale ◽  
Uv Light Irradiation ◽  
Photocatalytic Application ◽  
Blue Solution

Population growth and urbanization have led to water scarcity and pollution, which is a health hazard not only to humans but also to the ecosystem in general. This has necessitated coming up with ways of treating water before consumption. Photocatalysis has proved to be one of the most promising cheap techniques that involve chemical utilization of solar energy. TiO2 widely used in photocatalysis absorbs a narrow range of the solar spectrum compared to ZnO. In this regard, this study aimed at preparing and optimizing cobalt-pigmented ZnO, which is applicable in photocatalytic water treatment. The objectives in this study were to fabricate zinc oxide (ZnO) thin films by anodization, pigment the fabricated films with varying cobalt concentrations, characterize the fabricated films optically, and investigate the cobalt-pigmented ZnO’s performance in the methylene blue degradation under UV light irradiation. Mirror-polished zinc plates were sonicated in ethanol and rinsed. Anodization was done at room temperature in 0.5 M oxalic acid at a constant voltage of 10 V for 60 min, and cobalt electrodeposited in the films. Post-deposition treatment was done at 250°C. Optical properties of the films were studied using a UV-VIS- NIR spectrophotometer in the solar range of 300–2500 nm. The photocatalytic activity of the fabricated films was studied in methylene blue solution degradation in the presence of UV light irradiation for 5 h. Cobalt pigmenting was observed to reduce reflectance and optical band gap from 3.34 to 3.10 eV indicating good photocatalytic properties. In this study, ZnO film pigmented with cobalt for 20 s was found to be the most photocatalytic with a rate constant of 0.0317 h−1 and hence had the optimum cobalt concentration for photocatalytic water treatment. This can be applied in small-scale water purification.

Photoreductive dissolution of cerium oxide nanoparticles and their size-dependent absorption properties

2020 ◽  
Vol 22 (10) ◽  
pp. 5756-5764
Author(s):  
Natasha W. Pettinger ◽  
Jennifer M. Empey ◽  
Sascha Fröbel ◽  
Bern Kohler
Keyword(s):  
Cerium Oxide ◽  
Uv Light ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Absorption Properties ◽  
Size Dependent ◽  
Redox Active ◽  
Dependent Absorption

Changing the size of cerium oxide nanoparticles with UV light provides insights into the absorption properties of this redox-active photocatalyst.

scholarly journals Auto-combustion Fabrication and Optical Properties of Zinc Oxide Nanoparticles for Degradation of Reactive Red 195 and Methyl Orange Dyes

2021 ◽  
Author(s):  
Ayman Awad Ali Abdelrazik ◽  
Ibrahim S. Ahmed ◽  
Alaa S. Amin ◽  
Mai M. Gneidy
Keyword(s):  
Zinc Oxide ◽  
Methyl Orange ◽  
Zinc Oxide Nanoparticles ◽  
Uv Light ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Oxide Nanoparticles ◽  
Uv Light Irradiation ◽  
Auto Combustion ◽  
Reactive Red 195

Abstract A new preparation method has been successfully utilized for the fabrication of zinc oxide nanoparticles using the auto-combustion method and fuels (tartaric acid: TA and citric acid: CA) with molar ratio (Zn:TA:CA=1:1:0, 1:0:0.55 and 1:0.5:0.275). The as-fabricated ZTA, ZCA and ZCTA samples annealed at 500 oC for two hours. The calcined zinc oxide nanoparticles were investigated by various tools such as XRD, DRS, FT-IR, and HR-TEM. The average crystallite size of the fabricated zinc oxide was determined to be 24-39 nm. The direct band gap, lattice parameters, unit cell volume (V), the dislocation density (D) and the Zn-O bond length (L) of the synthesized ZTA, ZCA and ZCTA samples were determined. The synthesized zinc oxide nanoparticles are used as nanocatalyst for photodegradation of reactive red 195 and methyl orange dyes under UV light irradiation. The degradation of reactive red 195 dye was 91-94 % after 70 min over the synthesized zinc oxide and the values of degradation increased to be 99-99.8 % in 50 min with H2O2 under UV light irradiation. Also, the degradation of methyl orange dye was 57.55-70.57 % after 300 min over the synthesized zinc oxide (ZTA, ZCA and ZCTA samples) and the values of degradation increased to be 81-95 % in 70 min with H2O2 under UV light irradiation. Finally, the appeared rate constant (Kapp) is determined and the mechanism of the photocatalysis process is suggested for the degradation of the dyes over the synthesized zinc oxide nanoparticles.

Cobalt-doped cerium oxide nanoparticles: Enhanced photocatalytic activity under UV and visible light irradiation

2014 ◽  
Vol 26 ◽  
pp. 218-224 ◽  
Author(s):  
Jayapalan Saranya ◽  
Kugalur Shanmugam Ranjith ◽  
Padmanaban Saravanan ◽  
Devanesan Mangalaraj ◽  
Ramasamy Thangavelu Rajendra Kumar
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Cerium Oxide ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles

Polyacrylic Acid Modified Cerium Oxide Nanoparticles: Synthesis and Characterization as a Peroxidase Mimic for Non-Enzymatic H2O2 Sensor

2020 ◽  
Vol 16 (5) ◽  
pp. 816-828
Author(s):  
Gurdeep Rattu ◽  
Nishtha Khansili ◽  
Prayaga M. Krishna
Keyword(s):  
Hydrogen Peroxide ◽  
Cerium Oxide ◽  
Polyacrylic Acid ◽  
Spectroscopic Analysis ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Peroxidase Mimic ◽  
Ft Ir ◽  
H2o2 Sensing ◽  
Fluorescence Spectrometer

Background: Cerium oxide nanoparticles (nanoceria) are efficient free-radical scavengers due to their dual valence state and thus exhibit optical and catalytic properties. Therefore, the main purpose of this work was to understand the peroxidase mimic activity of polymer-stabilized nanoceria for enzyme-less H2O2 sensing by fluorescence spectrometer. Objective: This research revealed the development of fluorescence hydrogen peroxide nanosensor based on the peroxidase-like activity of polyacrylic acid stabilized nanoceria (PAA-CeO2 Nps). Methods: PAA-CeO2 Nps were synthesized by simple cross-linking reaction at a low temperature and characterized by XRD, SEM, Zeta potential, TGA, FT-IR and UV-VIS spectroscopic analysis. H2O2 sensing was performed by a fluorescence spectrometer. Results:: The synthesized polymer nanocomposite was characterized by XRD, SEM, TGA, FT-IR and UV-VIS spectroscopic analysis. The XRD diffraction patterns confirmed the polycrystalline nature and SEM micrograph showed nanoparticles having hexagonal symmetry and crystallite size of 32 nm. The broad peak of Ce–O bond appeared at 508 cm-1. UV-VIS measurements revealed a welldefined absorbance peak around 315 nm and an optical band-gap of 3.17 eV. As synthesized PAACeO2 Nps effectively catalysed the decomposition of hydrogen peroxide (H2O2) into hydroxyl radicals. Then terephthalic acid was oxidized by hydroxyl radical to form a highly fluorescent product. Under optimized conditions, the linear range for determination of hydrogen peroxide was 0.01 - 0.2 mM with a limit of detection (LOD) of 1.2 μM. Conclusion: The proposed method is ideally suited for the sensing of H2O2 at a low cost and this detection system enabled the sensing of analytes (sugars), which can enzymatically generate hydrogen peroxide.

Radiosensitizing Effect of Cerium Oxide Nanoparticles on Human Leukemia Cells

2018 ◽  
Vol 6 (2) ◽  
pp. 111-115 ◽  
Author(s):  
Azadeh Montazeri ◽  
Zohreh Zal ◽  
Arash Ghasemi ◽  
Hooman Yazdannejat ◽  
Hossein Asgarian-Omran ◽  
...  
Keyword(s):  
Cerium Oxide ◽  
Leukemia Cells ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Human Leukemia ◽  
Radiosensitizing Effect ◽  
Human Leukemia Cells
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