Noble metal modified titania catalysts in the degradation of Reactive Black 5: a kinetic approach

2011 ◽  
Vol 64 (5) ◽  
pp. 1040-1045 ◽  
Author(s):  
A. Valentine Rupa ◽  
R. Vaithiyanathan ◽  
T. Sivakumar
Keyword(s):  
Visible Light ◽  
Metal Salt ◽  
Sol Gel ◽  
Industrial Effluent ◽  
Kinetic Studies ◽  
Economic Feasibility ◽  
Reactive Black 5 ◽  
Tio2 Catalyst ◽  
Degussa P25 ◽  
Gel Technique

The photocatalytic degradation of Reactive Black 5 (RB 5), a di-azo dye was investigated over M/TiO2 (M = Ag, Au and Pt) photocatalysts irradiated with UV and visible light. TiO2 was prepared by sol–gel technique (Syn-TiO2). Photodeposition of metal salt precursors over Syn-TiO2 was carried out so as to obtain 1 wt% of M/TiO2 catalysts. The photodecolourization and photodegradation reactions were also compared with commercial TiO2 (Degussa P25) catalyst. Kinetic studies for the decolourization of RB 5 showed that it followed pseudo first order. Recycling of catalysts was performed to check the economic feasibility of the photocatalytic process. In order to check the applicability of M/TiO2 catalyst in the treatment of industrial effluent, real textile effluent was collected from an industry and subjected to photodegradation and the results are presented. Enhanced activity of M/TiO2 catalyst under visible light irradiation highlights its importance in the field of photocatalysis.

Photocatalytic Activity of Bismuth Ferrite Nanoparticles Synthesized via Sol-Gel Route

2019 ◽  
Vol 233 (5) ◽  
pp. 595-607 ◽  
Author(s):  
Mohsin Siddique ◽  
Noor Muhammad Khan ◽  
Muhammad Saeed
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Bismuth Ferrite ◽  
Sol Gel ◽  
Reaction System ◽  
Light Conditions ◽  
X Ray Diffraction ◽  
Light Region ◽  
Gel Technique

Abstract Nanosized, magnetically separable bismuth ferrite (BFO) nanoparticles, pertaining a crystallite size in the range of 14–15 nm were prepared via facile sol-gel technique. The product was characterized by scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The product was explored for the photocatalytic mineralization of rhodamine B (RB) dye in aqueous medium. The effect of different investigational parameters such as amount of photocatalyst, initial dye concentration and irradiation time on the photocatalytic degradation of RB was studied. The results reveal that the catalyst shows good degrading ability under normal pH and visible light conditions. BFO nanoparticles demonstrated a strong absorption ability in the visible-light region, which lead to efficient photocatalytic degradation of RB dye The reaction system was heterogeneous in nature in which the catalyst can be separated by a normal magnet.

scholarly journals Photocatalytic efficiency of titanium dioxide immobilized on PVP/AAc hydrogel membranes: A comparative study for safe disposal of wastewater of Remazol Red RB-133 textile dye

2005 ◽  
Vol 7 (4) ◽  
pp. 181-185 ◽  
Author(s):  
Hoda S. Hafez ◽  
A. El-Hag Ali ◽  
M. S. A. Abdel-Mottaleb
Keyword(s):  
Sol Gel ◽  
Textile Wastewater ◽  
Textile Dye ◽  
Photocatalytic Efficiency ◽  
Safe Disposal ◽  
Hydrogel Membranes ◽  
Different Types ◽  
Degussa P25 ◽  
Gel Technique ◽  
Remazol Red

The paper reports on the photocatalytic efficiency ofTiO2nanoparticles immobilized on polyvinyl pyrrolidone/acrylic acid (PVP/AAc) copolymer hydrogels, which are prepared by means ofγ-rays induced homo- and copolymerization. The efficiency of immobilized photocatalyst is tested on a commercial textile dye namely Remazol Red RB-133. The results are compared with photocatalytic efficiencies of different types of non supportedTiO2photocatalysts such as aqueous slurries of colloidalTiO2prepared by sol-gel technique, and commercially available Degussa P25. Although less efficient than nonsupported ones, the hydrogel supportedTiO2photocatalyst has the practical advantages of easy separation and removal from the reactors. This makes it a viable technique for the safe disposal of textile wastewater into the water streams.

Studies of MnO2/g-C3N4 hetrostructure efficient of visible light photocatalyst for pollutants degradation by sol-gel technique

2020 ◽  
Vol 20 ◽  
pp. 100512 ◽  
Author(s):  
S. Panimalar ◽  
R. Uthrakumar ◽  
E.Tamil Selvi ◽  
P. Gomathy ◽  
C. Inmozhi ◽  
...  
Keyword(s):  
Visible Light ◽  
Sol Gel ◽  
Visible Light Photocatalyst ◽  
Gel Technique

scholarly journals Surface-Plasmon-Induced Visible Light Photocatalytic Activity of Fe3O4/TiO2 Nanocomposite

2020 ◽  
Author(s):  
Narjes Esmaeili ◽  
Azadeh Ebrahimian Pirbazari ◽  
Ziba Khodaee
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Plasmon ◽  
Resonance Effect ◽  
Sol Gel ◽  
Analytical Techniques ◽  
Visible Light Photocatalytic Activity ◽  
Structure Morphology ◽  
Gel Technique ◽  
Visible Light Photocatalytic

In this research, first a binary nanocomposite of magnetic recyclable photocatalyst Fe3O4/TiO2, was synthesized by sol gel technique. Then, in order to enhance the photocatalytic activity of the synthesized nanocomposite, it was deposited by silver nanoparticles for using in degradation of organic pollutants 2, 4-dichlorophenol (2, 4-DCP) under visible light. A range of analytical techniques including XRD, FESEM/EDX, DRS, VSM and N2 physisorption were employed to reveal the crystal structure, morphology and property of the nanocomposites. We obtained 32% and 55% degradation of 2, 4-DCP under visible light after 180 min irradiation in the presence of Fe3O4/TiO2 and Fe3O4/TiO2/Ag respectively. Thus, the excellent visible light photocatalytic activity of Fe3O4/TiO2/Ag sample can be attributed to the surface plasmon resonance effect of Ag nanoparticles deposited on Fe3O4/TiO2 nanocomposite.

scholarly journals Photocatalytic degradation of VOCs from air stream using Mo:TiO2/GAC nanocomposites

2022 ◽  
Author(s):  
Kamaladdin Abedi ◽  
Behzad Shahmoradi ◽  
Ebrahim Mohammadi ◽  
Kitirote Wantala ◽  
Afshin Maleki ◽  
...  
Keyword(s):  
Visible Light ◽  
Sol Gel ◽  
Operational Parameters ◽  
Photodegradation Efficiency ◽  
Air Stream ◽  
Bet Analysis ◽  
Visible Light Active ◽  
Gel Technique ◽  
Active Composite ◽  
By Products

Abstract Modification of TiO2 is one of the techniques used to enhance its photodegradation efficiency and to make it visible-light-active. In this study, Mo-doped TiO2 nanoparticles were synthesized using a fast sol-gel technique, and then coated on granular activated carbon (GAC) as both substrate and adsorbent to obtain Mo:TiO2/GAC composite. The fabricated composite was characterized using powder XRD, SEM, EDAX, FTIR, and BET analysis. Then the composite was applied to photodegrade volatile organic compounds (VOCs) under both UV and visible light irradiation. The characterization results showed high crystallinity and purity. Mo:TiO2/GAC composite had higher photodegradation efficiency compared with bare TiO2 and bare GAC. Moreover, studying operational parameters showed that the optimum condition for photodegradation efficiency of VOCs was at flowrate of 1 l/min, VOCs concentration of 20 ppm, and light intensity of 400 and 600 W/m2 for UV and visible light respectively. The results suggest that Mo:TiO2/GAC is a visible-light-active composite and can be acceptably used to decompose VOCs under visible light with adequate efficiency and without the generation of harmful by-products such as O3 as compared with UV.

Nonporous Nitrogen and Ruthenium Co-Doped Titania Films for Photocatalysis

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940043 ◽  
Author(s):  
O. Linnik ◽  
L. Khoroshko
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Structural Properties ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Gel Technique ◽  
Titania Films ◽  
Doped Titania ◽  
Co Doped

Nitrogen and ruthenium co-doped titania films synthesized by sol–gel technique exhibit high photocatalytic activity under both UV and visible light. Incorporation of nitrogen and ruthenium ions in titania lattice is proven by XPS. Both doping agents affected the structural properties of the films.

scholarly journals Surface-Plasmon-Induced Visible Light Photocatalytic Activity of Fe3O4/TiO2 Nanocomposite

2020 ◽  
Author(s):  
narjes esmaeili ◽  
azadeh ebrahimian pirbazari ◽  
Ziba Khodaee
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Plasmon ◽  
Resonance Effect ◽  
Sol Gel ◽  
Analytical Techniques ◽  
Visible Light Photocatalytic Activity ◽  
Structure Morphology ◽  
Gel Technique ◽  
Visible Light Photocatalytic

In this research, first a binary nanocomposite of magnetic recyclable photocatalyst Fe3O4/TiO2, was synthesized by sol gel technique. Then, in order to enhance the photocatalytic activity of the synthesized nanocomposite, it was deposited by silver nanoparticles for using in degradation of organic pollutants 2, 4-dichlorophenol (2, 4-DCP) under visible light. A range of analytical techniques including XRD, FESEM/EDX, DRS, VSM and N2 physisorption were employed to reveal the crystal structure, morphology and property of the nanocomposites. We obtained 32% and 55% degradation of 2, 4-DCP under visible light after 180 min irradiation in the presence of Fe3O4/TiO2 and Fe3O4/TiO2/Ag respectively. Thus, the excellent visible light photocatalytic activity of Fe3O4/TiO2/Ag sample can be attributed to the surface plasmon resonance effect of Ag nanoparticles deposited on Fe3O4/TiO2 nanocomposite.

Visible light photocatalytic activity of Fe3+-doped ZnO nanoparticle prepared via sol–gel technique

Chemosphere ◽  
2013 ◽  
Vol 91 (11) ◽  
pp. 1604-1611 ◽  
Author(s):  
Muneer M. Ba-Abbad ◽  
Abdul Amir H. Kadhum ◽  
Abu Bakar Mohamad ◽  
Mohd S. Takriff ◽  
Kamaruzzaman Sopian
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Zno Nanoparticle ◽  
Visible Light Photocatalytic Activity ◽  
Gel Technique ◽  
Doped Zno ◽  
Visible Light Photocatalytic

Synthesis, Characterization, and Comparison of Sol–Gel TiO2 Immobilized Photocatalysts

2013 ◽  
Vol 11 (2) ◽  
pp. 633-639
Author(s):  
Clara Duca ◽  
Gustavo E. Imoberdorf ◽  
Madjid Mohseni
Keyword(s):  
Photocatalytic Activity ◽  
Composite Coatings ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Dichlorophenoxyacetic Acid ◽  
Titanium Tetraisopropoxide ◽  
Vis Spectroscopy ◽  
Degussa P25 ◽  
Gel Technique ◽  
2,4 Dichlorophenoxyacetic Acid

Abstract This study was focused on the synthesis of titania-based photocatalytic coatings with high photocatalytic activity, attrition resistance, and stability. Five different photocatalytic coatings were synthesized using the sol–gel technique. Three coatings were prepared using aqueous sols of TiO2 nanoparticles with different amounts of titanium tetraisopropoxide and different quantities and types of acids. The other two photocatalysts were composite sol–gel coatings which were prepared by incorporating commercial Degussa P25 into the TiO2 synthesized through sol–gel technique. The physical and optical properties of the immobilized photocatalysts were characterized with UV–vis spectroscopy, X-ray diffraction, scanning electron microscopy, and light scattering. The photocatalytic activity of each coating was determined using a lab-scale differential photoreactor by measuring the degradation rate of a model micropollutant, the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). The conversions of 2,4-D obtained with the TiO2 coatings without Degussa P25 were in the order of 7–23%, whereas the two composite coatings provided conversions in the range of 66–69%. In addition, one of the composite coatings showed a more homogeneous morphology and less cracking, and for this reason, it was more durable and showed lower attrition.

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