scholarly journals Efficient photocatalytic degradation of dyes using photo-deposited Ag nanoparticles on ZnO structures: simple morphological control of ZnO

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8709-8717
Author(s):  
Hyeonhan Lim ◽  
Mohammad Yusuf ◽  
Sehwan Song ◽  
Sungkyun Park ◽  
Kang Hyun Park
Keyword(s):  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Ag Nanoparticles ◽  
Morphology Control ◽  
Morphological Control ◽  
Degradation Of Dyes

Morphology control of ZnO structures were fabricated by hydrothermal method with simple adjustments of NaOH concentration and Ag–ZnO composite showed superior photoactivity and recyclability for the degradation of MO and RhB.

scholarly journals Application of Green Synthesized Metal Nanoparticles in the Photocatalytic Degradation of Dyes and Its Mathematical Modelling Using the Caputo–Fabrizio Fractional Derivative without the Singular Kernel

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
S. Dave ◽  
A. M. Khan ◽  
S. D. Purohit ◽  
D. L. Suthar
Keyword(s):  
Methyl Orange ◽  
Mathematical Modelling ◽  
Fractional Derivative ◽  
Photocatalytic Degradation ◽  
Ag Nanoparticles ◽  
Iron Nanoparticles ◽  
Experimental Results ◽  
Singular Kernel ◽  
Biological Synthesis ◽  
Degradation Of Dyes

Textile dyes are untreated discharge into the environment which results in a significant increase in water pollution levels worldwide. Due to the continuous addition of toxic organic dyes, a necessary strategic model is required for the complete degradation of dyes in textile effluent. This paper considers the possibility of biological synthesis of silver and iron nanoparticles and their use in photocatalytic degradation. The immediate change of silver nitrate solution occurring from colorless to brown is observed after the addition of the aqueous leaf extract, indicating the successive reduction of Ag+ ions to the Ag nanoparticles. These formed Ag nanoparticles were subjected to examine the photocatalytic activity under the solar radiation for the degradation of methyl orange. Green synthesized Ag nanoparticles were found to successfully degrade methyl orange up to 95% between 70 hours than the initial exposure time. The absorbance of methyl orange was measured at 465 nm. The present paper is focused on fractional mathematical modelling of dye degradation in textile effluents using the Caputo–Fabrizio fractional derivative without the singular kernel. The iterative Laplace transform method is employed to obtain an analytic solution for the absorption transport equation. The obtained experimental results showing significant removal of dyes from textile wastewater are compared using modelling results. The innovative approach is in outstanding agreement with the findings of the experiment. The mathematical modelling for the dye removal process helps to design suitable environmental management studies to reduce the adverse effect caused by toxic wastewater. Model validation has been shown by comparing analytical simulated solutions with experimental results for photocatalytic degradation using silver and iron nanoparticles as eco-friendly and low-cost agents.

Photocatalytic degradation of organic dyes by La3+/Ce3+-H3PW12O40 under different light irradiation

2014 ◽  
Vol 43 (24) ◽  
pp. 9061-9069 ◽  
Author(s):  
Taohai Li ◽  
Quanguo Li ◽  
Jing Yan ◽  
Feng Li
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Visible Light Irradiation ◽  
Organic Dyes ◽  
Light Irradiation ◽  
Highly Efficient ◽  
Degradation Of Dyes

La3+-H3PW12O40 and Ce3+-H3PW12O40 photocatalysts were synthesized by the PEG-1000 assisted hydrothermal method. These prepared photocatalysts exhibited highly efficient light-driven photocatalytic activity for the degradation of dyes (MO and RhB) under UV- and visible light irradiation.

Microstructure Characterization of Ag Nanoparticles Prepared by Hydrothermal Method

2012 ◽  
Vol 476-478 ◽  
pp. 1138-1141
Author(s):  
Zhi Qiang Wei ◽  
Qiang Wei ◽  
Li Gang Liu ◽  
Hua Yang ◽  
Xiao Juan Wu
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Hydrothermal Method ◽  
Ag Nanoparticles ◽  
Average Particle Size ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Face Centered

Ag nanoparticles were successfully synthesized by hydrothermal method under the polyol system combined with traces of sodium chloride, Silver nitrate(AgNO3) and polyvinylpyrrolidone (PVP) acted as the silver source and dispersant respectively. The samples by this process were characterized via X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption equation, transmission electron microscopy (TEM) and the corresponding selected area electron diffraction (SAED) to determine the chemical composition, particle size, crystal structure and morphology. The experiment results indicate that the crystal structure of the samples is face centered cubic (FCC) structure as same as the bulk materials, The specific surface area is 24 m2/g, the particle size distribution ranging from10 to 50 nm, with an average particle size about 26 nm obtained by TEM and confirmed by XRD and BET results.

scholarly journals Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

2015 ◽  
Vol 7 (4) ◽  
pp. 1569-1578 ◽  
Author(s):  
Khan Mamun Reza ◽  
ASW Kurny ◽  
Fahmida Gulshan
Keyword(s):  
Photocatalytic Degradation ◽  
Degradation Of Dyes

Visible light driven 3D hierarchical CoTiO3/BiOBr direct Z-scheme heterostructure with enhanced photocatalytic degradation performance

2021 ◽  
Author(s):  
Lijie Wang ◽  
Qiang Li ◽  
Xiaoxiao Lu ◽  
Zhenfei Tian ◽  
Shiwu He ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Three Dimensional ◽  
Simple Hydrothermal Method ◽  
Visible Light Driven

A series of novel three-dimensional (3D) CoTiO3/BiOBr (CTBB) hierarchical heterostructures were prepared via a simple hydrothermal method. In comparison with pure CoTiO3 and BiOBr, all the CTBB nanocomposites display enhanced...

scholarly journals Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 604 ◽  
Author(s):  
Robert Arthur ◽  
John Ahern ◽  
Howard Patterson
Keyword(s):  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Radical Scavenging ◽  
Flow Chemistry ◽  
Active Species ◽  
Effective Strategies ◽  
Degradation Of Dyes ◽  
Bismuth Oxyhalides ◽  
Electron Holes

Bismuth oxyhalides have recently gained attention for their promise as photocatalysts. Due to their layered structure, these materials present fascinating and highly desirable physicochemical properties including visible light photocatalytic capability and improved charge separation. While bismuth oxyhalides have been rigorously evaluated for the photocatalytic degradation of dyes and many synthesis strategies have been employed to enhance this property, relatively little work has been done to test them against pharmaceuticals and pesticides. These persistent organic pollutants are identified as emerging concerns by the EPA and effective strategies must be developed to combat them. Here, we review recent work directed at characterizing the nature of the interactions between bismuth oxyhalides and persistent organic pollutants using techniques including LC-MS/MS for the determination of photocatalytic degradation intermediates and radical scavenging to determine active species during photocatalytic degradation. The reported investigations indicate that the high activity of bismuth oxyhalides for the breakdown of persistent organic pollutants from water can be largely attributed to the strong oxidizing power of electron holes in the valence band. Unlike conventional catalysts like TiO2, these catalysts can also function in ambient solar conditions. This suggests a much wider potential use for these materials as green catalysts for industrial photocatalytic transformation, particularly in flow chemistry applications.

Comparison of photocatalytic degradation of dyes in relation to their structure

2013 ◽  
Vol 20 (6) ◽  
pp. 3570-3581 ◽  
Author(s):  
R. Byberg ◽  
J. Cobb ◽  
L. Diez Martin ◽  
R. W. Thompson ◽  
T. A. Camesano ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Degradation Of Dyes
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