The superiority of silver-doped titania for photocatalytic oxidation (PCO) of organic compounds inspired us to
investigate PCO of 1,2-cyclohexanediol. Ag/TiO2 was prepared, characterized (nanosize 19–24 nm) and used for
oxidation of 1,2-cyclohexanediol (1) in acetonitrile. The photolysate was analyzed using GC and GC/MS techniques.
The PCO products are 2-hydroxylcyclohexanone (2), 1,2-cyclohexandione (3), 2-cyclohexenone(4), cyclohexanone
(5), and adipic acid (6).The formation of electron–hole pair at the surface of the catalyst followed by oxidation
reactions was the suggested mechanism. Kinetic studies revealed first-order mechanism for PCO of 1 and rate
constant (k) =
0.145 h–1. Copyright © 2012 John Wiley & Sons, Ltd.

LaBr3:Ce scintillating detectors exhibit excellent properties for γ-ray spectroscopy such as high energy resolution and operation under room temperature as well as MHz counting rates. On the other hand, sever background radiations exist due to the internal contamination of radioactive materials that are very difficult to be avoided during the manufacture. To decrease the effect of these background levels, some analytical techniques, e.g. background subtraction, should be applied. In the present work, we investigate the efficiency of the sensitive nonlinear iterative clipping peak (SNIP) method for background estimation and subtraction. Optimization of the clipping window is discussed for range of energy up to 3 MeV. Enhancement of energy resolution up to 50% was obtained.

LaBr3:Ce scintillating detectors exhibit excellent properties for γ-ray spectroscopy such as high energy resolution and operation under room temperature as well as MHz counting rates. On the other hand, sever background radiations exist due to the internal contamination of radioactive materials that are very difficult to be avoided during the manufacture. To decrease the effect of these background levels, some analytical techniques, e.g. background subtraction, should be applied. In the present work, we investigate the efficiency of the sensitive nonlinear iterative clipping peak (SNIP) method for background estimation and subtraction. Optimization of the clipping window is discussed for range of energy up to 3 MeV. Enhancement of energy resolution up to 50% was obtained.

Active interrogation in 235U was demonstrated with LaBr3:Ce scintillation detectors using the nuclear resonance fluorescence (NRF) technique. An NRF experiment was performed at the High Intensity y-ray Source (HlyS) facility using quasi-monochromatic circularly or linearly polarized y-ray beams. Photons scattered at 90o relative to the incident beam were detected with two different sizes of cylindrical LaBr3:Ce detectors. Clear NRF peaks at 1733 and 1815 keV corresponding to de-excitations to the ground state and/or low-lying levels in 235U were observed within 77 minutes of beam time even under the high background due to the self-activity of LaBr3:Ce and the radioactive decay of 214Bi nuclei existing in the 235U target. The present study shows a possibility of using LaBr3:Ce detector to perform NRF experiments, promoting many options for inspection of special nuclear materials.

Active interrogation in 235U was demonstrated with LaBr3:Ce scintillation detectors using the nuclear resonance fluorescence (NRF) technique. An NRF experiment was performed at the High Intensity y-ray Source (HlyS) facility using quasi-monochromatic circularly or linearly polarized y-ray beams. Photons scattered at 90o relative to the incident beam were detected with two different sizes of cylindrical LaBr3:Ce detectors. Clear NRF peaks at 1733 and 1815 keV corresponding to de-excitations to the ground state and/or low-lying levels in 235U were observed within 77 minutes of beam time even under the high background due to the self-activity of LaBr3:Ce and the radioactive decay of 214Bi nuclei existing in the 235U target. The present study shows a possibility of using LaBr3:Ce detector to perform NRF experiments, promoting many options for inspection of special nuclear materials.

A nuclear resonance fluorescence (NRF) experiment was performed on a 235U target with quasi-monochromatic γ-rays at the High Intensity γ-ray Source (HIγS) facility using a 1733 keV resonant energy. A LaBr3(Ce) detector array consisting of eight cylindrical detectors, each with a length of 7.62 cm and a diameter of 3.81 cm, was implemented in this measurement. Moreover, a high-purity germanium (HPGe) detector array consisting of four detectors, each of which has a relative efficiency of 60%, was used as the benchmark for the measurement taken using the LaBr3(Ce) detector array. The integrated cross section of the NRF level, measured with LaBr3(Ce) detectors, showed good agreement with the available data.

A nuclear resonance fluorescence (NRF) experiment was performed on a 235U target with quasi-monochromatic γ-rays at the High Intensity γ-ray Source (HIγS) facility using a 1733 keV resonant energy. A LaBr3(Ce) detector array consisting of eight cylindrical detectors, each with a length of 7.62 cm and a diameter of 3.81 cm, was implemented in this measurement. Moreover, a high-purity germanium (HPGe) detector array consisting of four detectors, each of which has a relative efficiency of 60%, was used as the benchmark for the measurement taken using the LaBr3(Ce) detector array. The integrated cross section of the NRF level, measured with LaBr3(Ce) detectors, showed good agreement with the available data.

Malathion is one of the most commonly used
organophosphorous pesticides worldwide. Gold nanoparticles
can be used for the degradation and removal of
10 ppm malathion. The morphology of the prepared gold
nanoparticle is characterized by transmission electron microscopy.
Photodegradation of malathion on irradiation to
different light sources was monitored using different tools
such as UV–visible spectra and high-performance liquid
chromatography. Photodegradation rate of malathion was
enhanced in the presence of gold nanoparticles as a result
of surface plasmon phenomena.

Um método versátil e com rápida sensibilidade para a determinação individual e simultânea
das drogas anticancerígenas emodina (Em) e irinotecano (Irino) em fluidos biológicos baseados
na voltametria de onda quadrada (SWV) utilizando um eletrodo de grafite de lápis renovável
(PGE), foi investigado. A acumulação adsortiva controlada de Em e Irino na superfície PGE foi
explorada para a determinação de traços de drogas anticancerígenas em fluidos biológicos. Sob
as condições experimentais otimizadas como o pH do eletrólito suporte, potencial e tempo de
acumulação e parâmetros eletroquímicos, curvas de calibração para análise de traços de Em e
Irino individualmente e simultaneamente, mostraram uma excelente resposta linear. Os limites
de detecção 5,17 × 10-10 e 1,68 × 10-9 mol L-1 de Em e Irino foram obtidos usando SWV em um
PGE, respectivamente. Os resultados obtidos mostraram boa estabilidade, reprodutibilidade,
repetibilidade e alta recuperação para a determinação de traços das duas drogas em fluidos
biológicos. A análise estatística e os dados da curva de calibração para determinação de traços de
Em e Irino individualmente, bem como, simultaneamente, são relatados.
A rapid sensitive and versatile method for the individual and simultaneous determination of
the anticancer drugs emodin (Em) and irinotecan (Irino) in biological fluids based on the square
wave voltammetry (SWV) using a renewable pencil graphite electrode (PGE) was investigated.
Controlled adsorptive accumulation of both Em and Irino on the PGE surface was exploited for
trace determination of the anticancer drugs in biological fluids. Under the optimized experimental
conditions such as supporting electrolyte pH, accumulation potential and time and electrochemical
parameters, calibration curves for trace assay of Em and Irino individually and simultaneously
showed an excellent linear response. Limits of detection of 5.17 × 10-10 and 1.68 × 10-9 mol L-1
Em and Irino in bulk form were achieved using SWV at a PGE, respectively. The obtained results
showed good stability, reproducibility, repeatability and high recovery to assay of two drugs in
biological fluids. The statistical analysis and the calibration curve data for trace determination of
Em and Irino individually as well as simultaneously are reported.