scholarly journals Decolorization of Methylene Blue withTiO2Sol via UV Irradiation Photocatalytic Degradation

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Jun Yao ◽  
Chaoxia Wang
Keyword(s):  
Methylene Blue ◽  
Uv Irradiation ◽  
Anatase Phase ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Initial Concentration ◽  
X Ray ◽  
Photodegradation Efficiency ◽  
Degradation Ratio ◽  
Catalyst Load

TiO2sol was prepared for the degradation of methylene blue (MB) solution under ultraviolet (UV) irradiation. The absorption spectra of MB indicated that the maximum wavelength, 663 nm, almost kept the same. The performance of 92.3% for color removal was reached after 160 min. The particle size ofTiO2sol was about 22.5 nm. X-ray diffraction showed thatTiO2consisted of a single anatase phase. The small size and anatase phase probably resulted in high photocatalytic activity ofTiO2sol. The degradation ratio decreased as the initial concentration of MB increased. The photodegradation efficiency decreased in the order ofpH 2>pH 9>pH 7. Regarding catalyst load, the degradation increased with the mass of catalyst up to an amount of 1.5 g⋅L−1then decreased as the mass continued to increase. The addition ofH2O2toTiO2sol resulted in an increase on the degradation ratio.

scholarly journals High efficient photocatalytic activity of Zn-Al-Ti layered double hydroxides nanocomposite

2018 ◽  
Vol 149 ◽  
pp. 01087 ◽  
Author(s):  
F. Amor ◽  
A. Diouri ◽  
I. Ellouzi ◽  
F. Ouanji ◽  
M. Kacimi
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Layered Double Hydroxides ◽  
Removal Rate ◽  
X Ray Diffraction ◽  
Simple Method ◽  
X Ray ◽  
High Efficient ◽  
Double Hydroxides

This work establishes a simple method for synthesising layered double hydroxides (LDHs) powders with coprecipitation. The characteristics of the samples were investigated y X-ray diffraction (XRD), scanning electron microscopy (SEM) and spectrophotometer UV–Vis (DRS). Non-uniform distribution was shown for LDHs samples by SEM. Photocatalytic efficiencies were tested using methylene blue (MB) dye as a model contaminant under UV irradiation. In particular, Zn–Al-Ti LDH exhibited an excellent performance towards MB degradation compared with commercial TiO2 nanoparticles. Methylene blue removal percentage was reached at almost 100%, whereas commercial TiO2 reached a removal rate of only 66% under the same conditions within 20 min. The aim of the current work is to prepare Zn-Al-Ti layered double hydroxides nanocomposite and to evaluate their photocatalytic activity in the removal of methylene blue under UV irradiation.

scholarly journals Synthesis of copper oxide nano-rice structures for enhancement of photocatalytic activity under natural sunlight

2019 ◽  
Vol 20 (5) ◽  
pp. 253-262
Author(s):  
Roonak Abdul Salam A.Alkareem
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Electron Microscope ◽  
Copper Oxide ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Methylene Blue Degradation ◽  
X Ray ◽  
Uv Visible ◽  
Scanning Electron

In this work, copper oxide (CuO) nano-rice structure was prepared by hydrothermal method. The prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and UV-visible spectrophotometer. CuO nano-rice structure showed high photocatalytic activity towards degradation of methylene blue (MB). Hydrothermally growth of CuO provided uniformly distributed nano-rice structures with high degradation efficiency (90.41%) and rate constant (kt) 16.6 × 10-2 min-1 for methylene blue degradation.

scholarly journals Influence of Ag Photodeposition Conditions over SERS Intensity of Ag/ZnO Microspheres for Nanomolar Detection of Methylene Blue

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3414
Author(s):  
Luis Zamora-Peredo ◽  
Josué Ismael García-Ramirez ◽  
Amado Carlos García-Velasco ◽  
Julián Hernández-Torres ◽  
Leandro García-González ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Raman Spectroscopy ◽  
Uv Irradiation ◽  
Irradiation Time ◽  
Molar Concentration ◽  
Sers Substrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nanomolar Detection ◽  
Ag Deposition

Surface enhanced Raman spectroscopy (SERS) is considered a versatile and multifunctional technique with the ability to detect molecules of different species at very low molar concentration. In this work, hierarchical ZnO microspheres (ZnO MSs) and Ag/ZnO MSs were fabricated and decorated by hydrothermal and photodeposition methods, respectively. For Ag deposition, precursor molar concentration (1.9 and 9.8 mM) and UV irradiation time (5, 15, and 30 min) were evaluated by SEM, TEM, X-ray diffraction and Raman spectroscopy. X-ray diffraction showed a peak at 37.9° corresponding to the (111) plane of Ag, whose intensity increases as precursor concentration and UV irradiation time increases. SEM images confirmed the formation of ZnO MSs (from 2.5 to 4.5 µm) building by radially aligned two-dimensional ZnO nanosheets with thicknesses below 30 nm. The Raman spectra of Ag/ZnO MSs exhibited a vibration mode at 486 cm−1 which can be directly associated to Ag deposition on ZnO MSs surface. The performance of SERS substrate was evaluated using rhodamine 6G. The SERS substrate grown at 9.8 mM during 30 min showed the best SERS activity and the ability to detect methylene blue at 10−9 M.

scholarly journals Co/TiO2 nanoparticles: preparation, characterization and its application for photocatalytic degradation of methylene blue

2018 ◽  
Author(s):  
azadeh ebrahimian pirbazari ◽  
Pejman Monazzam ◽  
Behnam Fakhari Kisomi
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Anatase Phase ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Cobalt Doping ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir

In this work, TiO2 nanoparticles containing different amounts of cobalt were synthesized by sol-gel method using titanium (IV) isopropoxide and cobalt chloride as titanium and cobalt precursors, respectively. X-ray diffraction (XRD) results showed prepared samples include 100% anatase phase. The presence of cobalt in TiO2 nanoparticle network was established by XRD, scanning electron microscopy equipped with energy dispersive X-ray microanalysis (SEM-EDX), Fourier transform infrared (FT-IR) and N2 physisorption techniques. The increase of cobalt doping enhanced redshif in the diffuse reflectance spectra. The photocatalytic activity of the prepared samples was tested for degradation of methylene blue (MB) as a model of dye. Although the photocatalytic activity of pure TiO2 was found to be higher than that of Co/TiO2 samples under UV irradiation, the presence of 0.24% cobalt dopant in TiO2 nanoparticles resulted in a photocatalyst with the highest activity under visible light

Application of Fibrous TiO2 as a Photocatalyst in Aqueous Media

2006 ◽  
Vol 45 ◽  
pp. 951-956
Author(s):  
Hidekazu Tanaka ◽  
Ikuyo Higashio ◽  
Keiichi Watanabe ◽  
Yoko Suyama
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Uv Irradiation ◽  
Anatase Phase ◽  
Aqueous Media ◽  
Rutile Phase ◽  
High Photocatalytic Activity

Fibrous TiO2 with ca. 0.16 mm in width and 5 - 6 cm in length was prepared by drying a suspension of monodispersed anatase particles at 363 K in air. The TiO2 fibers thus obtained were thermally treated at the temperatures ranging from 363 to 1273 K for 1 h in air. Elevating the treating temperature increases the crystallinity of anatase phase and reduces the specific surface area from 98 to 5 m2/g due to the sintering of particles. The rutile phase appears at 1273 K by transformation of anatase phase. A photocatalytic activity of the fibers was examined by decomposition of methylene blue (MB) in water under UV irradiation centered at 365 nm. The fibers decomposed the MB in aqueous media under UV irradiation, indicating that the fibers possess a high photocatalytic activity. The catalytic activity is considered to be enhanced on increasing the crystallinity of anatase phase, nevertheless, that decreased with generation of rutile phase.

scholarly journals Synthesis of Ag decorated TiO2 nanoneedles for photocatalytic degradation of methylene blue dye

2021 ◽  
Author(s):  
Noor J. Ridha ◽  
Firas K Alosfur ◽  
Hiba Basim Abbas Kadhim ◽  
Luma Majeed Ahmed
Keyword(s):  
Uv Irradiation ◽  
Ag Nanoparticles ◽  
Anatase Phase ◽  
Industrial Effluents ◽  
Blue Dye ◽  
High Catalytic Activity ◽  
X Ray Diffraction ◽  
Photodegradation Efficiency ◽  
Novel Approach ◽  
Potential Remedy

Abstract Water pollution due to the discharge of industrial effluents such as dyes is a serious concern that requires a potential remedy. In this context, photocatalysis is a potent and ecofriendly strategy to degrade these toxic water effluents. In this study, a novel approach to prepare TiO2 nanoneedles decorated with Ag nanoparticles is reported. The sample was prepared using modified photodeposition and was annealed at 400 °C. The X-ray diffraction (XRD) revealed that TiO2 in anatase phase with the presence of Ag were prepared successfully. The corresponding crystalline size of TiO2 and Ag were 6.86 nm and 3.94 nm, respectively. The scanning electron microscopy (SEM) showed that the prepared TiO2 exhibited nanoneedles structure decorated with Ag nanoparticles. The prepared sample exhibited impressive photocatalytic performance toward degrading of 50 ppm Methyl Blue (MB) in the presence of UV irradiation. Using catalyst dose of 4 mg the photodegradation efficiency (PDE) reached to 98.7% after 50 min of UV irradiation. This improved photocatalytic activity is attributed to high catalytic activity and surface area of the synthesized Ag decorated TiO2 nanoneedles.

scholarly journals Hydrothermal Synthesis of TiO2/Al2O3 Nanocomposite and its Application as Improved Sonocatalyst

2018 ◽  
Vol 7 (4.37) ◽  
pp. 22 ◽  
Author(s):  
Assist. Prof. Ali S. Ali ◽  
Alaa J. Mohammed ◽  
Haider R. Saud
Keyword(s):  
Methylene Blue ◽  
Crystal Size ◽  
Anatase Phase ◽  
Al2o3 Nanoparticles ◽  
Average Crystal Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blue Solution ◽  
Ft Ir ◽  
Α Al2o3

The powder of TiO2/α-Al2O3 nanocomposite for Sonocatalysis decolorisation was successfully achieved in the Hydrothermal autoclave reaction for 6 hours and completely crystallized into Anatase phase at temperature of 220oC which more lower than normal required calcination temperature 500oC. The TiO2/α-Al2O3 nanoparticles examined using FT-IR, SEM, TGA, X-ray diffraction studies( XRD), The results indicate the formation of nanocomposite with tetragonal Anatase phase and average crystal size of 21.4nm for TiO2/α-Al2O3 while the average crystal size of 8.1nm for Al2O3, which are calculated according to Scherrer’s equation. This powder was mixed with methylene blue to study the effect of nanocomposite on it, the prepared nanocomposite show highly decolorisation percentage of methylene blue solution. 

scholarly journals Influence of the number of layers on photocatalysis activity of TiO2 thin films

2018 ◽  
Vol 7 (2) ◽  
pp. 88-97
Author(s):  
Abderhamane Boutelala ◽  
Fouzia Bourfaa ◽  
Mohamed Mahtali
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Anatase Phase ◽  
Sol Gel ◽  
Blue Dye ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
X Ray ◽  
Force Microscopy ◽  
Number Of Layers

Titanium oxide (TiO2) is one of the most important semiconductors because of their properties. This study was carried out to investigate the influence of the number of layers of Co -doped TiO2 thin films obtained by sol–gel method on the photocatalytic activity. The crystalline structure of films is characterised by means of X-ray diffraction and Raman spectroscopy. All the films were of anatase phase and the particle size was in nanoscale. The surface morphology was studied by atomic force microscopy. The optical properties were investigated by UV-visible spectroscopy. The photocatalytic properties of the samples were tested on the degradation of methylene blue dye solution. The results indicated that photocatalysis is more important when the number of dipping of films increases.Keywords: Photocatalysis, X-ray diffraction, TiO2, thin films, methylene blue.

Preparation of CuO Microspheres Consisting of Nanosheets and their Catalytic Activity in Degradation of Methylene Blue with Hydrogen Peroxide

2013 ◽  
Vol 838-841 ◽  
pp. 2310-2313
Author(s):  
Jin Yun Liao ◽  
Hao Li
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Monoclinic Phase ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Degradation Ratio ◽  
Microscope Images ◽  
Cuo Microspheres ◽  
Scanning Electron

In this study, CuO microspheres were synthesized by a facile hydrothermal method. X-ray diffraction pattern indicated that the as-prepared CuO sample is presented in monoclinic phase and field emission scanning electron microscope images demonstrated that CuO were composed of CuO nanoplatelets. The catalytic activity of CuO microspheres in the degradation of methylene blue (MB) with H2O2 was investigated. It was found that the degradation ratio of MB was less than 7% in the absence of CuO catalyst, while the degradation ratio can reach about 88% in the presence of CuO catalysts. It was revealed that the degradation efficiency of MB was the highest when the dose of CuO catalysts was 20 mg.

scholarly journals Synthesis of Magnetic Ferrocene-Containing Polymer with Photothermal Effects for Rapid Degradation of Methylene Blue

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 558
Author(s):  
Wenhui Zhu ◽  
Caiyun Zhang ◽  
Yali Chen ◽  
Qiliang Deng
Keyword(s):  
Methylene Blue ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Degradation Rate ◽  
Model Compound ◽  
Vibrating Sample Magnetometer ◽  
Simulated Sunlight ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir

Photothermal materials are attracting more and more attention. In this research, we synthesized a ferrocene-containing polymer with magnetism and photothermal properties. The resulting polymer was characterized by Fourier-transform infrared (FT-IR), vibrating sample magnetometer (VSM), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Its photo-thermocatalytic activity was investigated by choosing methylene blue (MB) as a model compound. The degradation percent of MB under an irradiated 808 nm laser reaches 99.5% within 15 min, and the degradation rate is 0.5517 min−1, which is 145 times more than that of room temperature degradation. Under irradiation with simulated sunlight, the degradation rate is 0.0092 min−1, which is approximately 2.5 times more than that of room temperature degradation. The present study may open up a feasible route to degrade organic pollutants.

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