scholarly journals Fabrication, Characterization and Photocatalytic Activity of Copper Oxide Nanowires Formed by Anodization of Copper Foams

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5030
Author(s):  
Alaa M. Abd-Elnaiem ◽  
M. A. Abdel-Rahim ◽  
A. Y. Abdel-Latief ◽  
Ahmed Abdel-Rahim Mohamed ◽  
Kristina Mojsilović ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Organic Compound ◽  
Organic Dye ◽  
Photocatalytic Efficiency ◽  
Voltage Range ◽  
Oxide Nanowires ◽  
Dye Decomposition ◽  
Photocatalytic Decolorization ◽  
Developed Surface

In recent paper anodization of copper foams in 0.1 M K2CO3 is reported. Anodization was performed in the voltage range of 5–25 V and in all the cases oxides with a developed surface area were obtained. However, anodizing only at 20 and 25 V resulted in the formation of nanostruc-tures. In all the cases, the products of anodizing consisted of crystalline phases like cuprite (Cu2O), tenorite (CuO), parameconite (Cu4O3) as well as spertiniite (Cu(OH)2). Copper foams after ano-dizing were applied as catalysts in the photocatalytic decolorization of a model organic compound such as methylene blue. The highest photocatalytic activity was observed for samples anodized at 25 V and closely followed by samples anodized at 5 V. The anodized copper foams proved to be a useful material in enhancing the photocatalytic efficiency of organic dye decomposition.

scholarly journals Fabrication, N-doping Mechanism and Evaluation of N-doped TiO2 Thin Films Based on Laser Ablation Method

2009 ◽  
Vol 2 (1) ◽  
pp. 17-23 ◽  
Author(s):  
S. Somekawa ◽  
Y. Kusumoto ◽  
H. Yang ◽  
M. Abdulla-Al-Mamun ◽  
B. Ahmmad
Keyword(s):  
Crystal Structure ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Laser Ablation ◽  
Anatase Phase ◽  
Rutile Phase ◽  
Laser Ablation Method ◽  
Dye Decomposition ◽  
N Doping ◽  
Keywords Laser

The relation among the change of the crystal structure, the amount of doped N and the photocatalytic activity for the decomposition of methylene blue was studied. The N-doping was promoted by the change of the crystal structure from the rutile phase to the anatase phase. The photocatalytic activity for the decomposition of methylene blue was enhanced by an increase in the amount of anatase crystals and doped N. Keywords: Laser ablation; N-doping process; Crystal change; N-doped TiO2 thin film; Dye decomposition. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i1.2992        J. Sci. Res. 2 (1), 17-23 (2010) 

scholarly journals Multitarget Evaluation of the Photocatalytic Activity of P25-SiO2 Prepared by Atomic Layer Deposition

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 450 ◽  
Author(s):  
Miguel Martín-Sómer ◽  
Dominik Benz ◽  
J. Ruud van Ommen ◽  
Javier Marugán
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Atomic Layer Deposition ◽  
Photocatalytic Oxidation ◽  
Atomic Layer ◽  
Bacterial Inactivation ◽  
Photocatalytic Efficiency ◽  
Term Operation ◽  
Oxidation Of Methanol ◽  
Layer Deposition

This work presents the evaluation of the photocatalytic activity of P25 TiO2 particles, coated with SiO2, using atomic layer deposition (ALD) for the photocatalytic removal of methylene blue, oxidation of methanol and inactivation of Escherichia coli bacteria in water and its comparative evaluation with bare P25 TiO2. Two different reactor configurations were used, a slurry reactor with the catalyst in suspension, and a structured reactor with the catalyst immobilized in macroporous foams, that enables the long-term operation of the process in continuous mode, without the necessity of separation of the particles. The results show that the incorporation of SiO2 decreases the efficiency of the photocatalytic oxidation of methanol, whereas a significant improvement in the removal of methylene blue is achieved, and no significant changes are observed in the photocatalytic inactivation of bacteria. Adsorption tests showed that the improvements, observed in the removal of methylene blue by the incorporation of SiO2, was mainly due to an increase in its adsorption. The improvement in the adsorption step as part of the global photocatalytic process led to a significant increase in its removal efficiency. Similar conclusions were reached for bacterial inactivation where the loss of photocatalytic efficiency, suggested by the methanol oxidation tests, was counteracted with a better adherence of bacteria to the catalyst that improved its elimination. With respect to the use of macroporous foams as support, a reduction in the photocatalytic efficiency is observed, as expected from the decrease in the available surface area. Nevertheless, this lower efficiency can be counteracted by the operational improvement derived from the easy catalyst reuse.

Efficient Sunlight Active Nanocomposite Photocatalyst for Degradation of Pollutant Organic Dyes

2013 ◽  
Vol 726-731 ◽  
pp. 650-653
Author(s):  
Li Mei Duan ◽  
Jing Hai Liu ◽  
Qing Yu Pang ◽  
Ling Xu ◽  
Zong Rui Liu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Treatment Process ◽  
Organic Dyes ◽  
Environmental Pollutants ◽  
Organic Dye ◽  
Water Treatment Process ◽  
One Step ◽  
Pollutants Removal ◽  
The One

The sunlight activated photocatalysts are urgently needed for the applications of photocatalytic techniques to environmental pollutants removal. Herein, we report the one-step hydrothermally prepared CdS/TiO2 nanocomposite photocatalyst that is active in the degradation of pollutant organic dyes under solar light. The morphology and components are confirmed by TEM, SEM and XRD. With methylene blue (MB) as the model pollutant organic dye, the photocatalytic activity of CdS/TiO2 nanocomposite photocatalyst under sunlight is demonstrated, and 80% MB is removed after 120 minutes sunlight illumination. Besides, the influences of pH, the amount of photocatalyst and the addition of H2O2 on photocatalytic activity for the degradation of MB are also investigated to mimic water treatment process.

ZnS:Mn2+ Quantum Dots as Efficient Photocatalyst for Organic Dye Decolorization

2018 ◽  
Vol 386 ◽  
pp. 207-213
Author(s):  
Ksenia A. Sergeeva ◽  
Alexander A. Sergeev ◽  
Yulia V. Kuznetsova ◽  
Sergey S. Voznesenskiy
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Room Temperature ◽  
Dye Decolorization ◽  
Organic Dye ◽  
Intrinsic Defect ◽  
Zinc Blende ◽  
Decolorization Efficiency ◽  
Uv Excitation

Fluorescent zinc blende structured pure and Mn2+ doped ZnS quantum dots were prepared by simple aqueous based technique at room temperature. Under UV-excitation the quantum dots show photoluminescence bands at 2.1 and 3.0 eV corresponded to Mn2+ and ZnS intrinsic defect emission, respectively. The photocatalytic activity was tested for the photodegradation of methylene blue in aqueous solution. The influence of the Mn2+ concentration on the dye decolorization efficiency was studied. The highest photocatalytic degradation rate of methylene blue was obtained for ZnS quantum dots in glutathione shell doped with 0.5 at.% of Mn2+. The mechanisms of photoluminescence and photocatalytic activity were discussed.

scholarly journals Superparamagnetic and photocatalytic activity of CoCe0.02Dy0.02Fe1.96O4 nanoparticles synthesized by citrate-gel autocombustion technique

2019 ◽  
Vol 9 (4) ◽  
pp. 4164-4167 ◽  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Analytical Techniques ◽  
Photocatalytic Efficiency ◽  
Semiconducting Materials ◽  
Light Utilization ◽  
Spin Glass Behaviour ◽  
Degussa P25

Mitigating organic pollutants by employing semiconducting materials is considered to be green and sustainable route to tackle the environmental problems. Herein, citrate-gel autocombustion method was adopted to synthesize Ce and Dy doped CoFe2O4 and characterized by various analytical techniques. The efficacy of prepared CoCexDyxFe2-2xO4 (x=0-0.04) samples were tested for degradation of Methylene blue (MB) under visible light irradiation. The photocatalytic efficiency of CoCe0.02Dy0.02Fe1.96O4 for degradation of MB was found to be larger than pure CoFe2O4, Degussa P25 and other modified CoFe2O4. The enhanced photocatalytic activity was attributed to improved charge separation and visible light utilization by Ce and Dy into CoFe2O4 system. The super-spin glass behaviour of CoCexDyxFe2-2xO4 confirmed from flat nature of magnetization of FC curve below TB.

Effect of Several Reagents on Photocatalytic Decolorization of Methyl Orange in Bi2O3 Suspension Systems

2011 ◽  
Vol 399-401 ◽  
pp. 1443-1446
Author(s):  
Feng Chun Zeng ◽  
Jun Bo Zhong ◽  
Jun Zeng ◽  
Jian Zhang Li
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photocatalytic Efficiency ◽  
Suspension Systems ◽  
Photocatalytic Decolorization ◽  
Decolorization Efficiency

The photocatalytic activity of Bi2O3 photocatalyst towards decolorization of Methyl Orange (MO) was studied by employing several reagents. The influence of H2O2 on the decolorization efficiency was investigated in detail. Addition of ions such as CO32−, Cl−, and SO42- inhibits the photocatalytic efficiency.

scholarly journals New photocatalytic nano additives based on titanium dioxide and silica for self-cleaning concrete.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 145-151
Author(s):  
K. A. Pozhivina ◽  
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Photocatalytic Performance ◽  
Industrial Wastes ◽  
Developed Surface ◽  
Nano Additives ◽  
Self Cleaning ◽  
Photocatalytic Concrete

In this article powdered composites of titanium dioxide and silica with high-developed surface(183–534 m2 / g), synthesized from industrial wastes, are considered as photocatalytic concrete additives. Their composition was studied, and the photocatalytic performance was evaluated by decomposition of the dye “Methylene blue” under UV-irradiation. The surfactant’s concentration at which the photocatalytic activity reaches its highest values was determined.

scholarly journals Formation and Photocatalytic Activity of BaTiO3Nanocubes via Hydrothermal Process

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Xinrun Xiong ◽  
Ruoming Tian ◽  
Xi Lin ◽  
Dewei Chu ◽  
Sean Li
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Photocatalytic Activity ◽  
Reaction Time ◽  
Hydrothermal Process ◽  
Photocatalytic Decomposition ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Methylene Orange ◽  
Hydrothermal Approach

We reported a facile hydrothermal approach to synthesize BaTiO3nanocubes with controlled sizes for degradation of methylene blue (MB). The nanocubes with reaction time of 48 hours exhibited the highest photocatalytic efficiency, owing to their narrower size distribution and better crystallinity compared to those of 24 hours and, at the meantime, smaller particle size than those of 72 hours. This work also demonstrated the degradation of methylene orange (MO) using BaTiO3nanocubes synthesized for 48 hours. Compared with the removal of MB, BaTiO3had lower photocatalytic activity on MO, mainly due to the poorer absorption behavior of MO on the surface of BaTiO3nanocubes. The degradation efficiency for each photocatalytic reaction was calculated. The possible mechanism of the photocatalytic decomposition on MB has been addressed as well.

scholarly journals Determination of the photocatalytic activity of TiO2 coatings on clay roofing tile substrates methylene blue as model pollutant

2009 ◽  
pp. 125-133 ◽  
Author(s):  
Eva Loncar ◽  
Miroslava Radeka ◽  
Snezana Petrovic ◽  
Andrea Skapin ◽  
Ognjen Rudic ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Photocatalytic Efficiency ◽  
Poly Ethylene Glycol ◽  
Spray Technique ◽  
Tio2 Coatings ◽  
Poly Ethylene

The photocatalytically active mesoporous coatings, based on titanium dioxide sols (Degussa), of the fired clay roofing tiles substrate were prepared by using poly(ethylene glycol) (PEG) M-600 and M-4000, as the structure directing agents. The coatings were deposited using spray technique followed by thermal treatment. Photocatalytic activity of the TiO2 coatings was evaluated by aqueous solution of methylene blue as model dye, deposited on the top of the coatings, after irradiation with UV light. The results were compared with the photocatalytic efficiency of some commercial self-cleaning products (clay roofing tiles, glass). The newly design coatings showed an interesting decolourisation performance (over 30 % after 24 h). It appeared that the procedure of photocatalytic activity determination, in the case of porous substrates, should be renewed by a preadsorption process.

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