UV-visible diffuse reflectance spectroscopic study of platinum, palladium, and ruthenium catalysts supported on silica

1991 ◽  
Vol 95 (4) ◽  
pp. 1690-1693 ◽  
Author(s):  
T. Lopez ◽  
M. Villa ◽  
R. Gomez
Keyword(s):  
Spectroscopic Study ◽  
Diffuse Reflectance ◽  
Ruthenium Catalysts ◽  
Uv Visible

The inclusion of diflunisal by ?-cyclodextrin and permethylated?-cyclodextrin. A UV-visible and19F nuclear magnetic resonance spectroscopic study

1988 ◽  
Vol 6 (2) ◽  
pp. 183-191 ◽  
Author(s):  
Stephen F. Lincoln ◽  
Andrea M. Hounslow ◽  
John H. Coates ◽  
Rosa P. Villani ◽  
Robert L. Schiller
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Spectroscopic Study ◽  
Uv Visible ◽  
Nuclear Magnetic

scholarly journals Reaction of a satirically hindered iron(III) porphyrin with peroxyacetic acid: Degradation kinetics

2005 ◽  
Vol 70 (8-9) ◽  
pp. 1105-1111 ◽  
Author(s):  
P. Prakash ◽  
Mary Francisca
Keyword(s):  
Reaction Mechanism ◽  
Spectroscopic Study ◽  
Kinetic Analysis ◽  
Peracetic Acid ◽  
Degradation Kinetics ◽  
Oxidative Degradation ◽  
Peroxyacetic Acid ◽  
Porphyrin Ligand ◽  
Uv Visible ◽  
Reversible Formation

A kinetic analysis of the reaction between peracetic acid (AcOOH), and tetrakis (pentafluorophenyl) - 21H, 23H-porphine iron(III) chloride Fe(F20TPP)Cl, in acetonitrile showed that the peracetic acid oxidatively destroys Fe(F20TPP)Cl. This is in contrast to an assumption that the oxidative degradation of metalloporphyrins can be prevented by the introduction of electron-withdrawing substituents into the phenyl groups of the porphyrin ligand. A UV-visible spectroscopic study showed a degree of macro cycle destruction of the tetrapyrrole conjucation of the metalloporphyrin. The degradation takes place via oxoperferryl species. The first step of the reaction mechanism is the reversible formation of an adduct ?X? (k1/k-1) between Fe(F20TPP)Cl and peracetic acid, followed by an irreversible step (k2) for the formation of oxoperferryl species.

Responses of Azospirillum brasilense to Nitrogen Deficiency and to Wheat Lectin: A Diffuse Reflectance Infrared Fourier Transform (DRIFT) Spectroscopic Study

2008 ◽  
Vol 56 (4) ◽  
pp. 615-624 ◽  
Author(s):  
Alexander A. Kamnev ◽  
Julia N. Sadovnikova ◽  
Petros A. Tarantilis ◽  
Moschos G. Polissiou ◽  
Lyudmila P. Antonyuk
Keyword(s):  
Fourier Transform ◽  
Spectroscopic Study ◽  
Azospirillum Brasilense ◽  
Diffuse Reflectance ◽  
Nitrogen Deficiency ◽  
Diffuse Reflectance Infrared

scholarly journals Preparation and Characterizations of In0.1SnxZn0.85-2xS Powder Photocatalysts for Hydrogen Production under Visible Light Irradiation

2011 ◽  
Vol 364 ◽  
pp. 238-242 ◽  
Author(s):  
Kimi Melody ◽  
Yuliati Leny ◽  
Mustaffa Shamsuddin
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Solid Solutions ◽  
Visible Light Irradiation ◽  
Diffuse Reflectance ◽  
Average Rate ◽  
Light Irradiation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible

A series of In0.1SnxZn0.85-2xS solid solutions was synthesized by hydrothermal method and employed as photocatalyst for photocatalytic hydrogen evolution under visible light irradiation. The structures, optical properties and morphologies of the solid solutions were studied by X-ray diffraction, diffuse reflectance UV–visible spectroscopy and field emission scanning electron microscopy. From the characterizations, it was confirmed that In0.1SnxZn0.85-2xS solid solution can be obtained and they have nanosized particles. The highest photocatalytic activity was observed on In0.1Sn0.03Zn0.79S photocatalyst, with average rate of hydrogen production 3.05 mmol/h, which was 1.2 times higher than the In0.1Zn0.85S photocatalyst.

Sensing Nanoparticulate ZnO with Benzimidazole Derivative by Fluorescence

2013 ◽  
Vol 543 ◽  
pp. 63-67
Author(s):  
Jayabharathi Jayaraman ◽  
Jayamoorthy Karunamoorthy
Keyword(s):  
Diffuse Reflectance ◽  
Electrochemical Impedance ◽  
Fluorescent Sensor ◽  
Sol Gel ◽  
Benzimidazole Derivative ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible ◽  
Doped Zno ◽  
Scanning Electron

A sensitive benzimidazole derivative fluorescent sensor for nanoparticulate ZnO has been designed and synthesized. The nanocrystalline ZnO, Ag doped ZnO and Cu doped ZnO have been synthesised by sol-gel method and characterized by powder X-ray diffraction, scanning electron microscopy (SEM) and UV-visible diffuse reflectance, photoluminescence and electrochemical impedance spectroscopies. The synthesized sensor emits fluorescence at 360 nm and this fluorescence is selectively enhanced by nanocrystalline ZnO. This technique is sensitive to detect and estimate ZnO at micro molar level. Impurities such as Ag and Cu do not hamper the sensitivity of this technique significantly. Keywords: Sensor, SEM, EDX, Impedance, Fluorescence

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