In this research, the clinoptilolite (clin) ore from Mianeh in East Azarbaijan was used for the preparation of nanocomposites. MoO3 and Mn2O3-MoO3 oxides were loaded on acid-washed zeolites by impregnation method and MoO3/Clin and Mn2O3-MoO3/Clin composites with 18 wt. More
In this research, the clinoptilolite (clin) ore from Mianeh in East Azarbaijan was used for the preparation of nanocomposites. MoO3 and Mn2O3-MoO3 oxides were loaded on acid-washed zeolites by impregnation method and MoO3/Clin and Mn2O3-MoO3/Clin composites with 18 wt. % of oxides were prepared. The prepared composites were characterized by XRD, FT-IR, FESEM, and EDX techniques. The presence of peaks related to the MoO3 and Mn2O3 oxides in the XRD pattern of composites and the existence of approximately spherical nanoparticles with sizes lower than 100 nm in their SEM images confirmed the preparation of composites. The catalytic activity of nanocomposites for removing thiophene was studied by the adsorption/oxidation method and the effect of solvent type, temperature, and oxidant on removal efficiency of thiophene was investigated. The results showed that Mn2O3-MoO3/Clin composite has better catalytic activity than MoO3/Clin in removing thiophene. Moreover, the increasing of temperature and applying NaClO as an oxidant improved the thiophene's degradation efficiency by this composite. The highest removal efficiency was obtained at 298 K in water-ethanol solvent by using oxidant for Mn2O3-MoO3/Clin composite which was about 66%. By changing the solvent from a polar solution (water and ethanol) to a nonpolar solvent (n-hexane) the removal efficiency decreased.
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A new biodesulfurization method has been considered using Pseudomonas aeruginosa supported on polyethylene (PE) for biodesulfurization (BDS) of dibenzothiophene (DBT) as heavy fuel oil sulphur compound model. The obtained results according to Spectrophotometric analysis More
A new biodesulfurization method has been considered using Pseudomonas aeruginosa supported on polyethylene (PE) for biodesulfurization (BDS) of dibenzothiophene (DBT) as heavy fuel oil sulphur compound model. The obtained results according to Spectrophotometric analysis at 325 nm showed that 90.54 % of DBT at the primary concentration about 5 (mg.L-1), pH=7, biocatalyst dosage of 0.1 g, in 37 °C and after 90 min of contact time has been removed. These optimum conditions have been applied for heavy fuel oil (mazut) samples and the biodegradation of their total sulphur content (TSC) has been investigated by X- ray fluorescence spectrometer (XRF). The obtained results revealed that 33.075 % of total sulphur content from mazut sample has been removed. Kinetic study predicted the chemisorption process as the rate determining step, as it followed the pseudo-second-order rate equation. The data for DBT adsorption on biocatalyst fitted to the Freundlich isotherm model. Morphology and surface functional groups of the biocatalyst have been investigated by SEM and FT-IR, respectively.
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In this study, we aimed to enhance the electrical conductivity of polymeric layers for potential applications in organic electronics such as sensors and capacitors. Electrically conductive polythiophene (PTh) and polypyrrole (PPy) layers were deposited on a poly methyl More
In this study, we aimed to enhance the electrical conductivity of polymeric layers for potential applications in organic electronics such as sensors and capacitors. Electrically conductive polythiophene (PTh) and polypyrrole (PPy) layers were deposited on a poly methyl methacrylate (PMMA) substrate using an in-situ chemical oxidative deposition method with FeCl3 as a catalyst and acetonitrile and deionized water as solvents. To further improve conductivity, multi-layer PTh and PPy, in the presence of carbon nanotubes (CNT), were applied on the PMMA substrate. The reaction times for synthesizing PTh and PPy were optimized to be 12 and 20 minutes, respectively, based on electrical properties. Fourier-transform infrared spectroscopy (FTIR) was used to identify the different components of the conductive polymers on the PMMA substrate. The morphology and thickness of the layers were investigated using scanning electron microscopy (SEM). The electrical conductivity of the layers was measured using a four-point probe device. The highest electrical conductivity of 100.93 S/cm was achieved for the two-layer poly pyrrole-polythiophene/CNT coating on the PMMA substrate. These findings demonstrate the potential of this multi-layer conductive coating for various organic electronic applications.
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Background & Objectives: Today, soils and waters polluted by petroleum compounds are major environmental problems. A major part of the harmful effects of oil is due to thiophenic compounds such as dibenzothiophene and other sulfur derivatives, with increasing eviden More
Background & Objectives: Today, soils and waters polluted by petroleum compounds are major environmental problems. A major part of the harmful effects of oil is due to thiophenic compounds such as dibenzothiophene and other sulfur derivatives, with increasing evidence of toxicity, carcinogenicity and their relative sustainability in nature. The purpose of this study was to investigate the possibility of biodegradation of these pollutants by microorganisms that have spread over the years in the presence of gas oil.Materials & Methods: In order to study the feasibility of dibenzothiophene usage by isolated microbial consortia, firstly, appropriate growth medium with dibenzothiophene as the sole sulfur source was made and the biomass of the microorganisms was chased for 10 days. In order to estimate the metabolic degenerative pathway of this compound, 2-Hydroxybiphenyl was tracked in the selective consortium growth medium. Finally, the effect of the consortium on thiophene, 2-methylthiophene and thiophene-2-carboxylic acid was investigated, as well.Results: Increasing biomass and eliminating dibenzothiophene in the presence of a microbial consortium and the absence of 2-Hydroxybiphenyl showed the consortium's ability to degrade this compound, but with a biochemical pathway other than 4S. The consortium was able to take thiophene and 2-methylthiophene, as well.Conclusion: The biodegradation activity and the scope of the substrates in comparison with conventional microorganisms suggest this consortium as a valuable biocatalyst for the decontamination of thiophenic contaminants.
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