scholarly journals Effect of the Morphology of Tungsten Oxide Embedded in Sodium Alginate/Polyvinylpyrrolidone Composite Beads on the Photocatalytic Degradation of Methylene Blue Dye Solution

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1905 ◽  
Author(s):  
Eman M. Elsayed ◽  
Mohamed S. Elnouby ◽  
M. H. Gouda ◽  
Noha A. Elessawy ◽  
D. M. F. Santos
Keyword(s):  
Methylene Blue ◽  
Acid Solution ◽  
Tungsten Oxide ◽  
Sodium Alginate ◽  
Hydrothermal Treatment ◽  
Dye Degradation ◽  
Tungstic Acid ◽  
Blue Dye ◽  
Spherical Form ◽  
Illumination Time

Tungsten oxide nanostructures were modified by oxygen vacancies through hydrothermal treatment. Both the crystalline structure and morphological appearance were completely changed. Spherical WO3·H2O was prepared from tungstic acid solution by aging at room temperature, while rod-like WO3·0.33H2O was prepared by hydrothermal treatment of tungstic acid solution at 120 °C. These structures embedded in sodium alginate (SA)/polyvinylpyrrolidone (PVP) were synthesized as novel porous beads by gelation method into calcium chloride solution. The performance of the prepared materials as photocatalysts is examined for methylene blue (MB) degradation in aqueous solutions. Different operation parameters affecting the dye degradation process, such as light intensity, illumination time, and photocatalyst dosage are investigated. Results revealed that the photocatalytic activity of novel nanocomposite changed with the change in WO3 morphology. Namely, the beads with rod nanostructure of WO3 have shown better effectiveness in MB removal than the beads containing WO3 in spherical form. The maximum degradation efficiency was found to be 98% for WO3 nanorods structure embedded beads, while the maximum removal of WO3 nanospheres structure embedded beads was 91%. The cycling-ability and reuse results recommend both prepared structures to be used as effective tools for treating MB dye-contaminated wastewaters. The results show that the novel SA/PVP/WO3 nanocomposite beads are eco-friendly nanocomposite materials that can be applied as photocatalysts for the degradation of cationic dyes in contaminated water.

scholarly journals Novel Sodium Alginate/Polyvinylpyrrolidone/TiO2 Nanocomposite for Efficient Removal of Cationic Dye from Aqueous Solution

2021 ◽  
Vol 11 (19) ◽  
pp. 9186
Author(s):  
Noha A. Elessawy ◽  
Marwa H. Gouda ◽  
Mohamed S. Elnouby ◽  
Hoda F. Zahran ◽  
Aly Hashim ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Sodium Alginate ◽  
Weight Ratio ◽  
Calcium Chloride Solution ◽  
Blue Dye ◽  
Efficient Removal ◽  
Effective Technique ◽  
Illumination Time ◽  
Dye Decomposition ◽  
Porous Beads

The combination of adsorption and photodegradation processes is an effective technique for the removal of dye contaminants from water, which is motivating the development of novel adsorbent-photocatalyst materials for wastewater treatment. Herein, novel nanocomposite porous beads were developed using titanium dioxide (TiO2) nanotubes embedded in a sodium alginate (SA)/polyvinylpyrrolidone (PVP) matrix using calcium chloride solution as a crosslinker. The prepared nanocomposite beads’ performance was examined as an adsorbent-photocatalyst for the breakdown of methylene blue in aqueous solutions. Several operation factors influencing the dye decomposition process, including photocatalyst dosage, illumination time, light intensity, and stability were investigated. The findings demonstrated that the removal activity of the beads changed with the TiO2 weight ratio in the composite. It was found that SA/PVP/TiO2-3 nanocomposite beads presented the greatest deterioration efficiency for methylene blue dye (98.9%). The cycling ability and reusability of the prepared SA/PVP/TiO2 nanocomposite beads recommend their use as efficient, eco-friendly materials for the treatment of wastewaters contaminated with cationic dyes.

Photo Catalytic Activity of Anatase TiO2/PVA Film Coated Glass Plate

2012 ◽  
Vol 584 ◽  
pp. 396-400 ◽  
Author(s):  
Aravind Naga Revuru ◽  
Nagarajan Padmavathy ◽  
Angappan Sheela ◽  
Swamiappan Sasikumar
Keyword(s):  
Methylene Blue ◽  
Dye Degradation ◽  
Anatase Phase ◽  
Glass Plate ◽  
Photocatalytic Decomposition ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Contributing Factors ◽  
Tio2 Sample ◽  
Tlc Plates

The major cause of surface and ground water contamination is due to effluent from dyeing industries. The discharged effluent chemicals inhibit light penetration into water bodies and some are considered to be carcinogenic. In this study, the photocatalytic decomposition of the synthetic dye, methylene blue was investigated in the presence of activated TiO2. The TiO2 sample was characterized by using XRD to analyze the presence of anatase and rutile phases. The dye degradation was monitored as a change in absorbance by UV-Visible spectrophotometer. The contributing factors towards dye degradation include both the dye concentration as well as the quantity of TiO2 used. Different quantities of TiO2 in anatase phase was taken and activated under UV radiation for 15 min. and subsequently coated on to TLC plates using 5% polyvinyl alcohol as a binding agent. This photocatalytic plate was kept in the methylene blue dye solution and exposed to sunlight. The results shows that 57% of the 30ppm methylene blue dye gets degraded within 75min., when exposed to UV activated TiO2 in presence of natural sunlight.

Two pure MOF-photocatalysts readily prepared for the degradation of methylene blue dye under visible light

2018 ◽  
Vol 47 (12) ◽  
pp. 4251-4258 ◽  
Author(s):  
Ming Zhang ◽  
Liwen Wang ◽  
Tianyu Zeng ◽  
Qigao Shang ◽  
Hong Zhou ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Coordination Polymers ◽  
Dye Degradation ◽  
Blue Dye ◽  
Methylene Blue Dye

Two 3D coordination polymers, bridged by 4,4′-bipyridine, were readily synthesized and fully characterized. As efficient photocatalysts in dye degradation under visible light, the mechanism and stability were studied.

Synergetic photocatalytic effect of high purity ZnO pod shaped nanostructures with H2O2 on methylene blue dye degradation

2020 ◽  
Vol 845 ◽  
pp. 156333 ◽  
Author(s):  
Ahad Mohammadzadeh ◽  
Mohammad Khoshghadam-Pireyousefan ◽  
Bahram Shokrianfard-Ravasjan ◽  
Maziyar Azadbeh ◽  
Hadi Rashedi ◽  
...  
Keyword(s):  
Methylene Blue ◽  
High Purity ◽  
Dye Degradation ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Photocatalytic Effect

scholarly journals Enhanced Performance of Electrospun Nanofibrous TiO2/g-C3N4 Photocatalyst in Photocatalytic Degradation of Methylene Blue

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 880 ◽  
Author(s):  
Feidias Bairamis ◽  
Ioannis Konstantinou ◽  
Dimitrios Petrakis ◽  
Tiverios Vaimakis
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Performance ◽  
Dye Degradation ◽  
Rutile Phase ◽  
Blue Dye ◽  
Oh Radicals ◽  
Environmental Technology ◽  
Light Region ◽  
Technology Applications ◽  
One Step

TiO2/g-C3N4 (GNT) fibers with 1%, 2.5% and 5% (wt%) ratios have been synthesized via one-step electrospinning using polyvinylpyrrolidone (PVP) polymer. Results showed mesoporous fibrous catalysts consisted of anatase (80.0–85.1%) and rutile phase (14.9–20.0%), with diameter between 200–300 nm and band gap lower than 3.0 eV confirming the absorption shift to visible-light region. The formation of •OH radicals and methylene blue dye degradation increases as the g-C3N4 doping percent also increases, following the trend ΤiO2 < GNT1% ≈ GNT2.5% < GNT5%. A z-scheme mechanism is attributed to the photocatalytic performance confirming the potential for green chemistry and environmental technology applications.

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