Herein, the synthesis of pure and modified mesoporous nanocrystalline NiO is reported. The catalyst was with different wt % F-ions or K2O used to produce Methyl ethyl ketone (MEK) as a potential fuel/solvent. XRD analysis promoted catalysts confirmed formation Ni-metal covered by host oxide, compared NiO, especially for x F-ions. CO2-TPD results demonstrated existence basic sites over these var...

Humans are frequently exposed to mixtures of environmental pollutants at low levels over prolonged periods of time yet most toxicity studies deal with acute exposure to high concentrations of single chemicals. Investigation of the biological effects and possible toxic interactions during long-term exposure to such mixtures is warranted. Here Jurkat T-cells were exposed to toluene, n-hexane and ...

Background: Volatile organic compounds (VOCs), including carcinogens and toxic compounds, are produced in petrochemical industries. We undertook this study in order to study workers’ respiratory exposure to different VOC concentrations and compare the results with the urinary levels of its metabolites and study the correlation between them in petrochemical industries. Materials and Met...

A relatively simple, automated system for the rapid, efficient and safe routine production of 9'l"'TcM from "Mo03 by the methyl-ethyl-ketone (MEK) extraction technique is described. The 4 phases of the extraction process bubbling of air, phase separation, drawing off of 9'lTc in MEK, and evaporation to dryness, are controlled by an automatic timer, suction-pressure pump and solenoid switches. T...

This computational and theoretical study deals with chain transfer to solvent (CTS) reactions of methyl acrylate (MA), ethyl acrylate (EA), and n-butyl acrylate (n-BA) self-initiated homopolymerization in solvents such as butanol (polar, protic), methyl ethyl ketone (MEK) (polar, aprotic), and p-xylene (nonpolar). The results indicate that abstraction of a hydrogen atom from the methylene group...

Herein we demonstrate the preparation and characterization of nanocrystalline ZnO, either pure or promoted with 1–10 wt.% K2O. All catalysts calcined at 400°C were in nano-crystallite scale as confirmed by X-ray powder diffraction analysis 22.9–28.0 nm range. According to CO2-temperature-programmed desorption study using thermogravimetric differential scanning calorimetry techniques, they have ...

background: volatile organic compounds (vocs), including carcinogens and toxic compounds, are produced in petrochemical industries. we undertook this study in order to study workers’ respiratory exposure to different voc concentrations and compare the results with the urinary levels of its metabolites and study the correlation between them in petrochemical industries. materials and methods: exp...