Metolachlor Photodegradation Study in Aqueous Media under Natural and Simulated Solar Irradiation

2005 ◽  
Vol 53 (3) ◽  
pp. 694-701 ◽  
Author(s):  
Aikaterini D. Dimou ◽  
Vasilios A. Sakkas ◽  
Triantafyllos A. Albanis
Keyword(s):  
Aqueous Media ◽  
Solar Irradiation ◽  
Simulated Solar Irradiation

scholarly journals Influence of Hydroxypropyl-β-Cyclodextrin on the Photostability of Fungicide Pyrimethanil

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Carlos Fernandes ◽  
Igor Encarnação ◽  
Alexandra Gaspar ◽  
Jorge Garrido ◽  
Fernanda Borges ◽  
...  
Keyword(s):  
Inclusion Complex ◽  
Aqueous Media ◽  
Aqueous Solubility ◽  
Solar Irradiation ◽  
Proton Nuclear Magnetic Resonance ◽  
Resonance Spectroscopy ◽  
Photochemical Degradation ◽  
Pesticide Application ◽  
Negative Effects ◽  
Simulated Solar Irradiation

Pesticides continue to play an important role in pest management. However, the intensive pesticide application has triggered several environment negative effects that cannot be disregarded. In this study, the inclusion complex of pyrimethanil with HP-β-CD has been prepared and characterized by proton nuclear magnetic resonance spectroscopy. The formation of the pyrimethanil/HP-β-CD inclusion complex increased the aqueous solubility of this fungicide around five times. To assess the influence of microencapsulation on the environmental photostability of the fungicide, the photochemical degradation of pyrimethanil and pyrimethanil/HP-β-CD inclusion complex has been investigated in different aqueous media such as ultrapure and river water under simulated solar irradiation. The studies allow concluding that pyrimethanil/HP-β-CD inclusion complex increases significantly the photostability of the fungicide in aqueous solutions, especially in natural water. Actually, the half-life of pyrimethanil/HP-β-CD inclusion complex was increased approximately by a factor of four when compared to the free fungicide. The overall results point out that pyrimethanil can be successfully encapsulated by HP-β-CD, a process that can improve its solubility and photostability properties.

A Thorough Investigation of Photo-catalytic Degradation of ortho and para-Nitro Phenols in binary mixtures: New Insights into Evaluating Degradations Progress Using Chemometrics Approaches

2021 ◽  
Author(s):  
S. Maryam Sajjadi ◽  
Zeinab Asadollah-pour ◽  
S. Hashem Sajjadi ◽  
S. Nasrin Nabavi ◽  
Zahra Abed ◽  
...  
Keyword(s):  
Binary Mixtures ◽  
Zno Nanoparticles ◽  
Catalytic Degradation ◽  
Solar Irradiation ◽  
Photo Catalyst ◽  
Decomposition Processes ◽  
Simulated Solar Irradiation ◽  
Photo Decomposition

In this study, photocatalytic degradations of 2-nitrophenol and 4-nitrophenol were carried out efficiently using ZnO nanoparticles photo-catalyst under simulated solar irradiation. The photo-decomposition processes were optimized simultaneously by employing central...

Photolytic degradation of quinalphos in natural waters and on soil matrices under simulated solar irradiation

Chemosphere ◽  
2006 ◽  
Vol 64 (8) ◽  
pp. 1375-1382 ◽  
Author(s):  
C. Gonçalves ◽  
A. Dimou ◽  
V. Sakkas ◽  
M.F. Alpendurada ◽  
T.A. Albanis
Keyword(s):  
Natural Waters ◽  
Solar Irradiation ◽  
Photolytic Degradation ◽  
Simulated Solar Irradiation

Rapid Degradation of Rhodamine B over Cyclodextrin Modified TiO2

2011 ◽  
Vol 694 ◽  
pp. 764-768
Author(s):  
Xu Zhang ◽  
Nan Sheng Deng
Keyword(s):  
Electron Transfer ◽  
Excited States ◽  
Rhodamine B ◽  
Self Assembly ◽  
Initial Rate ◽  
Solar Irradiation ◽  
Pollutant Degradation ◽  
Rapid Degradation ◽  
Hybrid Nanomaterial ◽  
Simulated Solar Irradiation

A novel β-cyclodextrin (β-CD) grafted titanium dioxide (TiO2/β-CD) was synthesized through photo-induced self assembly methods, and its structure was characterized. The TiO2/β-CD hybrid nanomaterial showed high photoactivity under visible light irradiation (λ  400 nm and/or λ  420 nm) and simulated solar irradiation (λ  365 nm). Photodegradation of rhodamine B followed the Langmuir–Hinshelwood kinetics model. The initial rate R0 of rhodamine B degradation increased by 4.6, 2.4 and 1.5 times in the irradiation conditions of λ  420 nm, λ  400 nm and λ  365 nm, respectively. β-CD increased the lifetimes of the excited states of the unreactive guests and facilitated the electron transfer from the excited dye to the TiO2 conduction band, which enhanced the dye pollutant degradation.

Red-emitting Ca1-xSrxS:Eu2+ Phosphors as Light Converters for Plant-growth Applications

2011 ◽  
Vol 1342 ◽  
Author(s):  
Qi Xia ◽  
Miroslaw Batentschuk ◽  
Andres Osvet ◽  
Peter Richter ◽  
Donat P. Häder ◽  
...  
Keyword(s):  
Broad Band ◽  
Solar Spectrum ◽  
Solar Irradiation ◽  
Solid State Reactions ◽  
Photon Flux ◽  
Spectral Modification ◽  
Simulated Solar Irradiation ◽  
Photosynthetic Activities ◽  
The Eu ◽  
Spinach Leaves

ABSTRACTA series of Ca1-xSrxS:Eu2+y mol% phosphors were synthesized with solid state reactions and with various Ca/Sr ratio and Eu2+ doping concentrations. The influences of the lattice composition and the Eu2+ doping level on photoluminescent properties were analyzed. With doping concentrations between 0.1 to 3 mol%, concentration quenching takes place leading to the decrease of luminance; the emission maxima are also red-shifted. Further, this work reports enhanced photosynthetic activities of intact spinach leaves due to spectral modification of simulated solar irradiation by one synthesized phosphor (Ca0.4Sr0.6S:Eu1 mol%). The CO2 assimilation rates of intact spinach leaves were monitored with an effective homemade photosynthesis measurement system with controlled light conditions. The phosphor could efficiently convert the photosynthetically less active green part of the solar spectrum into the red, with a broad-band red emission centered at 650 nm and a halfband-width of 68 nm, giving an excellent match with the absorption spectrum of spinach chloroplasts. By careful referencing the photon flux, we found an enhanced photosynthetic activities by about 30 % due to the emission of the phosphor.

g-C3N4 nanosheets decorated with carbon dots and CdS nanoparticles: Novel nanocomposites with excellent nitrogen photofixation ability under simulated solar irradiation

2019 ◽  
Vol 45 (2) ◽  
pp. 2542-2555 ◽  
Author(s):  
Hadi Diarmand-Khalilabad ◽  
Aziz Habibi-Yangjeh ◽  
Davod Seifzadeh ◽  
Soheila Asadzadeh-Khaneghah ◽  
Elham Vesali-Kermani
Keyword(s):  
Carbon Dots ◽  
Solar Irradiation ◽  
Cds Nanoparticles ◽  
Simulated Solar Irradiation

The critical role of light in moderating microbial stress due to mixtures of engineered nanomaterials

2018 ◽  
Vol 5 (1) ◽  
pp. 96-102 ◽  
Author(s):  
Carolyn M. Wilke ◽  
Jean-François Gaillard ◽  
Kimberly A. Gray
Keyword(s):  
Critical Role ◽  
Engineered Nanomaterials ◽  
Metal Nanoparticle ◽  
Toxic Effects ◽  
Solar Irradiation ◽  
Localized Surface Plasmon ◽  
E Coli ◽  
Simulated Solar Irradiation ◽  
Role Of Light

Light influences chemical interactions of engineered nanomaterials and their toxic effects. Under simulated solar irradiation, we observed that binary mixtures of n-Ag, n-Au, or n-Pt with n-TiO2cause synergistic toxic effects inE. colidue to photochemical interactions governed by metal nanoparticle stability and localized surface plasmon resonance.

Boosting photocatalytic H2O2 production by coupling of sulfuric acid and 5-sulfosalicylic acid incorporated polyaniline with g-C3N4

2020 ◽  
Vol 4 (8) ◽  
pp. 4186-4195 ◽  
Author(s):  
Hao-Dong Yang ◽  
Jun-Hao Huang ◽  
Kengo Shibata ◽  
Daling Lu ◽  
Kazuhiko Maeda ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Solar Irradiation ◽  
H2o2 Production ◽  
Sulfosalicylic Acid ◽  
Simulated Solar Irradiation

In this study, graphitic carbon nitride (g-C3N4, CN) was decorated with polyaniline (PANI), which was incorporated with inorganic (H2SO4) and organic (5-sulfosalicylic acid, SSA) acids for photocatalytic H2O2 production under simulated solar irradiation.

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