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- SourceAvailable from: Muhammad Yaseen[Show abstract] [Hide abstract]
ABSTRACT: The present research work focuses on a novel ultraclean desulfurization process of model oil by adsorption method using untreated, acid activated and magnetite nanoparticles loaded bentonite as adsorbents. The parameters investigated are effect of contact time, adsorbent dose, initial dibenzothiophene (DBT) concentration and temperature. Experimental tests were conducted in batch process. Pseudo first and second order kinetic equations were used to examine the experimental data. It was found that pseudo second order kinetic equation described the data of the DBT adsorption onto all types of adsorbents very well. . The isotherm data was analyzed using Langmuir and Freundlich isotherm models. The Langmuir isotherm model fit the data very well for the adsorption of DBT onto all three forms of adsorbents. The adsorption of DBT was also investigated at different adsorbent dose and was found that the percentage adsorption of DBT was increased with increasing the adsorbent dose, while the adsorption in mg/g was decreased with increasing the adsorbent dose. The prepared adsorbents were analyzed by scanning electron microscopy (SEM), Energy dispersive X ray spectrometry (EDX) and X-ray diffraction (XRD).Journal of Saudi Chemical Society 02/2015; 91. DOI:10.1016/j.jscs.2015.02.003
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ABSTRACT: Monodispersed powders of copper oxide precursor were produced in spherical and bipyramidal particle morphologies by the urea-based homogenous precipitation method. Composition of the starting reactant mixtures and synthesis conditions had significant effect on the morphology of the precipitated particles. Extensive optimization of these parameters was thus performed, in order to explore the key factors responsible for the production of monodispersed systems of the precipitated powders. It was observed that the particles obtained from the copper nitrate urea system were spherical and amorphous copper (II) basic carbonate, while those produced in copper chloride urea solution were bi-pyramidal and crystalline copper (II) basic chloride. On controlled calcination at the elevated temperatures both of these compounds transformed into crystalline copper oxide powders with identical crystal structures, though with different crystallite sizes. In both cases, the particles retained their original shape integrity to a maximum extent and showed no sign of sintering. (C) 2014 Published by Elsevier Ltd.Materials Research Bulletin 09/2014; 57:121–126. DOI:10.1016/j.materresbull.2014.05.028
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ABSTRACT: A simple and sensitive chemiluminescence (CL) method was developed for the determination of citalopram in pharmaceutical preparations and human plasma. The method is based on the enhancement of the weak CL signal of the luminol-H2 O2 system. It was found that the CL signal arising from the reaction between alkaline luminol and H2 O2 was greatly increased by the addition of silver nanoparticles in the presence of citalopram. Prepared silver nanoparticles (AgNPs) were characterized by UV-visible spectroscopy and transmission electron microscopy (TEM). Various experimental parameters affecting CL intensity were studied and optimized for the determination of citalopram. Under optimized experimental conditions, CL intensity was found to be proportional to the concentration of citalopram in the range 40-2500 ng/mL, with a correlation coefficient of 0.9997. The limit of detection (LOD) and limit of quantification (LOQ) of the devised method were 3.78 and 12.62 ng/mL, respectively. Furthermore, the developed method was found to have excellent reproducibility with a relative standard deviation (RSD) of 3.65% (n = 7). Potential interference by common excipients was also studied. The method was validated statistically using recovery studies and was successfully applied to the determination of citalopram in the pure form, in pharmaceutical preparations and in spiked human plasma samples. Percentage recoveries were found to range from 97.71 to 101.99% for the pure form, from 97.84 to 102.78% for pharmaceutical preparations and from 95.65 to 100.35% for spiked human plasma. Copyright © 2013 John Wiley & Sons, Ltd.Luminescence 05/2014; 29(3). DOI:10.1002/bio.2539
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