Effect of the concentration on the kinetic model of the photo-degradation of 5-hydroxymethylfurfural by UV irradiation

2016 ◽  
Vol 191 ◽  
pp. 67-76 ◽  
Author(s):  
Karla Aguilar ◽  
Alfonso Garvín ◽  
Albert Ibarz
Keyword(s):  
Kinetic Model ◽  
Uv Irradiation ◽  
Photo Degradation

CaFe2O4–ZnO magnetic nanostructures: photo-degradation of toxic azo-dyes under UV irradiation

2017 ◽  
Vol 28 (17) ◽  
pp. 12823-12838 ◽  
Author(s):  
Mojtaba Goodarzi ◽  
Sedighe Joukar ◽  
Davood Ghanbari ◽  
Kambiz Hedayati
Keyword(s):  
Uv Irradiation ◽  
Azo Dyes ◽  
Magnetic Nanostructures ◽  
Photo Degradation

scholarly journals Formation of stable Si–O–C submonolayers on hydrogen-terminated silicon(111) under low-temperature conditions

2015 ◽  
Vol 6 ◽  
pp. 19-26 ◽  
Author(s):  
Yit Lung Khung ◽  
Siti Hawa Ngalim ◽  
Andrea Scaccabarozzi ◽  
Dario Narducci
Keyword(s):  
Thermal Treatment ◽  
Kinetic Model ◽  
Uv Irradiation ◽  
Photoelectron Spectroscopy ◽  
Hydrogen Abstraction ◽  
Thermal Conditions ◽  
Terminal Group ◽  
Alcohol Solution ◽  
Bifunctional Molecules ◽  
Photochemical Route

In this letter, we report results of a hydrosilylation carried out on bifunctional molecules by using two different approaches, namely through thermal treatment and photochemical treatment through UV irradiation. Previously, our group also demonstrated that in a mixed alkyne/alcohol solution, surface coupling is biased towards the formation of Si–O–C linkages instead of Si–C linkages, thus indirectly supporting the kinetic model of hydrogen abstraction from the Si–H surface (Khung, Y. L. et al. Chem. – Eur. J. 2014, 20, 15151–15158). To further examine the probability of this kinetic model we compare the results from reactions with bifunctional alkynes carried out under thermal treatment (<130 °C) and under UV irradiation, respectively. X-ray photoelectron spectroscopy and contact angle measurements showed that under thermal conditions, the Si–H surface predominately reacts to form Si–O–C bonds from ethynylbenzyl alcohol solution while the UV photochemical route ensures that the alcohol-based alkyne may also form Si–C bonds, thus producing a monolayer of mixed linkages. The results suggested the importance of surface radicals as well as the type of terminal group as being essential towards directing the nature of surface linkage.

Photo-Degradation of C.I. Disperse Blue 56 by UV Irradiation Combined with Manganese Minerals

2010 ◽  
Vol 82 (7) ◽  
pp. 610-616 ◽  
Author(s):  
Jie Fu ◽  
Sheng Sheng ◽  
Yin Luo ◽  
Hui Zhao ◽  
Qing-Fu Zeng ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Photo Degradation ◽  
Manganese Minerals

Thermo-photo degradation of 2-propanol using a composite ceria-titania catalyst: Physico-chemical interpretation from a kinetic model

2018 ◽  
Vol 225 ◽  
pp. 298-306 ◽  
Author(s):  
Mario J. Muñoz-Batista ◽  
Ana M. Eslava-Castillo ◽  
Anna Kubacka ◽  
Marcos Fernández-García
Keyword(s):  
Kinetic Model ◽  
Photo Degradation ◽  
Physico Chemical

Degradation of Low Concentration Benzyl Butyl Phthalate (μg•L-1 range) in the Tail Water of Municipal Sewage Plant by UV/H2O2

2012 ◽  
Vol 518-523 ◽  
pp. 3131-3137
Author(s):  
Yan Yan Zeng ◽  
Qi Wu ◽  
Hong Bo Fan ◽  
Si Hao Lv
Keyword(s):  
Uv Irradiation ◽  
Municipal Sewage ◽  
Solution Ph ◽  
Photo Degradation ◽  
Low Concentration ◽  
Benzyl Butyl Phthalate ◽  
Sewage Plant ◽  
Advance Oxidation Process ◽  
Butyl Phthalate ◽  
Tail Water

The degradation of Benzyl butyl phthalate (BBP) at low concentration (μg•L-1 range) by the direct UV irradiation, H2O2 oxidation and UV/H2O2 advance oxidation process was investigated in this study. The experiment results showed that the decomposition efficiency of UV or H2O2 was worse than that of UV/H2O2. Under the condition of 24.26μw•cm-2 UV irradiation and 2.49 mM H2O2, the degradation efficiency of BBP at low concentration was over 90% after 30 min. In addition, the solution pH was found to have no significant effect on the photo-degradation of BBP. The degradation of low concentration BBP in the tail water of municipal sewage plant was 84.23% with UV/H2O2 at the UV irradiation (24.26μw•cm-2) and H2O2 (2.49 mM) without adjusting pH.

Fabrication and Photocatalytic Decolorization Performance of ZnO

2011 ◽  
Vol 396-398 ◽  
pp. 823-826
Author(s):  
Jie Cheng ◽  
Jian Zhang Li ◽  
Jun Bo Zhong ◽  
Wei Hu
Keyword(s):  
Methyl Orange ◽  
Kinetic Model ◽  
Uv Irradiation ◽  
Precipitation Method ◽  
Order Kinetic ◽  
First Order ◽  
Photocatalytic Decolorization ◽  
Langmuir Hinshelwood Mechanism ◽  
Order Kinetic Model ◽  
Pseudo First Order

Paralled flaw precipitation method has been employed to synthesize nanostructured ZnO. The prepared photocatalyst was characterized by BET, XRD. The paper reveals that Methyl Orange (MO) can be decolorized effectively in ZnO suspension system under UV irradiation. The optimal loading of photocatalyst in our experimental condition for the decolorization of MO is 1g/L. The present study, on the base of Langmuir-Hinshelwood mechanism, illustrates that the decolorization reaction is a pseudo first order kinetic model with the limiting rate constant of 8.48×10-2 mgL-1min-1 and equilibrium adsorption constant 0.335 L/mg, respectively.

scholarly journals Photocatalytic removal of cefazolin from aqueous solution by AC prepared from mango seed+ZnO under UV irradiation

2018 ◽  
Vol 20 (2) ◽  
pp. 399-407 ◽  
Keyword(s):  
Activated Carbon ◽  
Kinetic Model ◽  
Uv Irradiation ◽  
Advanced Oxidation ◽  
Beam Radiation ◽  
Initial Concentration ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order ◽  
Mango Seed

Presence of antibiotics in the environment specially in aqueous environments is considered a major warning about health and environment. Thus, this study aims the efficiency of coupled process of Activated Carbon (AC) prepared from mango seed+ZnO under UV irradiation as an advanced oxidation process in removing cefazolin antibiotic from aqueous solutions. This experimental study was carried out in a discontinuous reaction chamber with volume of one liter. In this process, the effect of initial pH parameters of the environment (3– 9), initial concentration of cefazolin (20 – 200 mg/L), concentration of modified, photocatalyzer (20 – 100 mg/L) and reaction time (10 – 60 min) were studied. The pilot used consisted of a low pressure mercury lamp with a 55-watt beam radiation power inside the steel chamber. The kinetic of the process was studied based on pseudo first order kinetics. Results showed that the highest removal efficiency of cefazolin antibiotics in the reaction of UV/AC + ZnO, at optimal conditions of pH= 3, contact time of 60 min, initial concentration of 100 mg/L and modified photocatalyzer of 0.1 g/L was equal to 96%. The kinetic model determined for the process followed kinetic model of pseudo- first order kinetics with high correlation of (R2 = 0.99). Results of present study revealed that photocatalyzer process of nanoparticles oxidation on synthetic activated carbon can be effectively used as an advanced oxidation reaction to remove cefazolin and similar pollutants.

scholarly journals Kinetic model of photoinitiated copolymerization of monofunctional monomers till high conversions

2009 ◽  
Vol 3 (1) ◽  
pp. 1-6
Author(s):  
Yuriy Medvedevskikh ◽  
◽  
Galyna Khovanets’ ◽  
Iryna Yevchuk ◽  
◽  
...  
Keyword(s):  
Kinetic Model ◽  
Uv Irradiation ◽  
Glycidyl Methacrylate ◽  
Laser Interferometry ◽  
Polymerization Process ◽  
Molar Ratio ◽  
Hydroxyethyl Methacrylate ◽  
Wide Range ◽  
Kinetics Of

Regularities of kinetics of photoinitiated copolymerization till high conversions in the systems of monofunctional methacrylate comonomers (hydroxyethyl methacrylate (HEMA), glycidyl methacrylate (GMA)) have been investigated by laser interferometry in a wide range of experimental factors (molar ratio of comonomers, photoinitiator concentration, intensity of UV-irradiation). Kinetic model of photoinitiated copolymerization of methacrylates till high conversions has been proposed on the basis of microheterogeneity conception of the polymerization process.

scholarly journals Evaluation of the photo-degradation of Alzheimer's amyloid fibrils with a label-free approach

2018 ◽  
Vol 54 (93) ◽  
pp. 13084-13087 ◽  
Author(s):  
Tianke Wang ◽  
Liwei Zhang ◽  
Jie Wang ◽  
Yonghai Feng ◽  
Enquan Xu ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Uv Irradiation ◽  
Quartz Crystal ◽  
Amyloid Fibrils ◽  
Label Free ◽  
Photo Degradation ◽  
Aβ Fibrils

Quartz crystal microbalance is a useful method to quantitatively evaluate the degradation of Aβ fibrils by porphyrin under UV irradiation.

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