The main challenge in the oxygen delignification process is the improvement of selectivity. To further understand the effect of the amount of hydroxyl radicals on the selectivity of oxygen delignification, in this work, the hydroxyl radicals were generated by the improved Fenton reaction system and were quantified by UV spectrophotometry. Antioxidants such as ascorbic acid were applied for the ...

The effectiveness and usability of a diffusion tube for air quality sampling were assessed at 14 sites throughout an oil gas production area in Atrush sub-district measurement Sulfur dioxide (SO2) nitrogen (NO2) ambient by Palmes tubes during autumn winter season 2021-2022. Using triethanolamine as trapping agent, the passive sampler collects SO2 NO2, which are then proven to be sulphate nitrit...

The interaction between felodipine and bovine serum protein was studied, the optimal experimental conditions were selected, fluorescence quenching mechanism discussed. filodipine determined by UV spectrophotometry, selected control variable method. of in system explored spectrophotometry. intensity most obvious under buffer solution pH 7.4, concentration 8.0*10 -4 mol/L, reaction time 30min 25°...

The present work aims to study the influence of some physicochemical parameters (light, temperature, ethanol, bile salts, potassium hydroxide, hydrogen peroxide) on content Metronidazole (MTZ) contained in reference substance (SR) and a pharmaceutical specialty Flagyl® 250 mg tablet (FLG). method developed was linear accurate accordance with USP 38 MTZ contents were obtained by UV-visible spect...

The visible (532 and 442 nm) and UV (325 nm) Raman spectra of bulk mixed metal oxides (metal molybdates and metal vanadates) were compared on the same spectrometer, for the first time, to allow examination of how varying the excitation energy from visible to UV affects the resulting Raman spectra. The quality of the Raman spectra was found to be a strong function of the absorption properties of...

Structural and UV/Visible optical properties can be useful to describe a material for the CIGS solar cell active layer, therefore, this work demonstrates the properties like surface morphology, X-ray Photoelectron Spectroscopy (XPS) bonding energy (EB) core level spectra, UV/Visible absorption spectra, refractive index (n), optical energy band (Eg), reflection spectra for the Cu25 (In16Ga9) Se4...

a novel zinc oxide - agar nanocomposite was successfully synthesized using zinc chloride as a precursor. the nanocomposite was prepared using a domestic microwave oven. the prepared nanocomposites have been characterized by fourier transform infrared (ftir) spectroscopy, x-ray diffraction (xrd) analysis, scanning electron microscopy (sem) and uv- visible spectroscopy. the crystalline properties...

In the present work, the ZnFe2O4 nanoparticle has been successfully synthesized. The obtained sample was characterized by X-ray diffraction (XRD), emission scanning electron microscopy (FE-SEM) and its optical property was examined by UV-Vis spectrophotometer. FE-SEM revealed that the particle size of the ZnFe2O4 of about 47 nm was synthesized. The photocatalytic performance under UV-Vis and vi...