فهرست مطالب abdollah fallah shojaei

This research aims to synthesize a novel adsorbent and reduce the contact time in removing methylene blue dye. Copper ferrite nanoparticles were prepared by solvothermal method and CuFe2O4/PVA/AG magnetic nanocomposite by freeze-thaw method and drying at room temperature. The structure and morphology of magnetic nanocomposite were investigated using FTIR, XRD, SEM, and EDX methods. CuFe2O4/PVA/AG adsorbent under optimal conditions of pH = 7, contact time 60 min, amount of adsorbent 40 mg, dye concentration 5ppm and temperature 25 ᵒC was investigated. The maximum absorption and absorption capacity were obtained as 81.1 % and 14.93 mg/g, respectively. In addition to investigating the recovery effect of the adsorbent for comparison, the PVA/AG adsorbent was investigated under the aforementioned optimal conditions, and the maximum removal efficiency was 63.5 %. Examining the isotherm of the equilibrium state of dye removal matches well with the Freundlich isotherm. The kinetics of surface adsorption were investigated, and observed that the adsorption process on the magnetic nanocomposite follows pseudo-second-order kinetic equations.

In this work, polyvinylidene fluoride membranes were modified by introducing nanostructure TiO2/SiO2/POM hybrid fibers in the polymeric dope, to endow them with photocatalytic properties. For this purpose, initially, hybrid fibers were synthesized by electrospinning and calcination technique, and then these additives were incorporated into the membrane matrix. FT-IR and XRD analysis were used for the characterization of synthesized compounds. The FESEM manifests that the average diameter of the hybrid composite fibers is about 500 nm, and investigated membrane morphology. The properties of the prepared photocatalytic membrane were examined by several investigations such as pure water flux, contact angle, salt, and heavy metal rejection. Photocatalytic experiments confirm that membranes display a highly efficient and durable activity for the photodegradation of Methylene Bue (MB) and Humic Acid (HA). Experiments show that the prepared membranes have excellent stability under UV irradiation and can be used potentially for the separation of different components from water. The measurement accuracy and repeatability were determined by calculating the Standard Deviation and entered into Tables.

QSAR investigations of some platinum (IV) derivatives were conducted using multiple linear regression (MLR) and artificial neural network (ANN) as modelling tools, along with simulated annealing (SA) and genetic algorithm (GA) optimization algorithms. In addition, CORAL software was used to correlate the biological activity to the structural parameters of the drugs. The obtained results from different approaches were compared and GA-ANN combination showed the best performance according to its correlation coefficient (R2) and mean sum square errors (RMSE). From the GA-ANN method, it was revealed that MTAS8e, ESpm05d, BElv3, MWC09, ESpm14u, BEHe2, RDF125e, and S3K are the most important descriptors. From Monte Carlo simulations, it was found that the presence of double bond, present of Platinum, number of chlorine connected to Pt, branching in molecular skeleton and presence of N and O atoms are the most important molecular features affecting the biological activity of the drug. It was concluded that simultaneous utilization of QSAR and Monte Carlo method can lead to a more comprehensive understanding of the relation between physico-chemical, structural or theoretical molecular descriptors of drugs to their biological activities.

In this study at first, in laboratory, three types of vanadium oxide were produced by using porous graphene and amine framework in hydrothermal method nanostructures such as: vanadium oxide - octadecyl amine - graphene, vanadium oxide - dodecyl amine - graphene and vanadium oxide – aniline - graphene (V-ODA-G، V-DDA-G، V-A-G). Then their structures and functions in propane dehydrogenation reactions were studied and productivity and efficiency of these catalysts in mentioned reactions were compared with each other. In order to notice and compare the structures and properties of synthesized catalysts, some methods such as Field Emission Scanning Electron Microscope (FE-SEM), X Ray Diffraction (XRD), Thermo Gravimetric Analysis (TGA), Fourier Transform Infrared Spectrometry (FTIR), Gas Chromatography (GC) have been used. The obtained results show that vanadium oxide nanostructures have great opportunities to be oxidatively dehydrogenation (ODH) and make sciences explore the use of porous grapheme as catalysts for propane oxidative dehydrogenation

Phenolic compounds are among of current pollutants of water resources. Photodegradation by using semiconductor nano photocatalyst is an effective and practicable method for the removal of these compounds. In this research, Sb/TiO2-Fe3O4 nano photocatalyst with 0 to 10 %w/w Sb was successfully synthesized and their structure was characterized by FT-IR, XRD, SEM methods. The size of synthesized particles was calculated using the XRD pattern and Scherrer equation which is accordant to the average size of nanoparticles observed in SEM images that were about 50 nm. Furthermore, the effects of various parameters including the initial pollutant and antimony concentrations, temperature, pH and the amount of catalyst were investigated. The phenol and 4-nitrophenol were degraded 70.1% and 95% with Sb/TiO2-Fe3O4 (5 %w/w Sb), respectively.

In this study we suggested a new strategy for drug delivery of 6-thioguanine (6-TG) as a cancer drug by loading of this thiolic drug at a surface of Au nanoparticles. For this goal, we synthesized Au nanoparticle (Au/NPs) by reduction of tetrachloroauric (III) acid solutions by sodium borohydride and characterized Au/NPs by X-ray powder diffraction (XRD), dynamic light scattering (DLS), Ultraviolet–visible spectroscopy (UV-Vis) and transmission electron microscopy (TEM) methods. Results showed good distribution of synthesized Au nanoparticle with diameter ~ 5 nm. In the second step, we loaded 6-thioguanine with strong Au-S bond by addition of this drug to Au nanoparticle suspension and characterized it by UV-Vis method. Furthermore, Au nanoparticle loaded with 6-thioguanine was utilized as a new system against breast cancer cell line (MCF7). IC50 for free 6-thioguanine, unloaded Au nanoparticle and 6-thioguanine loaded Au nanoparticle (6-TG/Au/NPs) were >15.0, 80.0 and 3.5 μg/ml, respectively. The results obtained revealed high cytotoxicity effect of 6-TG/Au/NPs on breast cancer cell line.

Metal-organic framework 5 (MOF-5) and bimetallic MOF-5s (Co/Zn and Ni/Zn) were prepared via a simple solvothermal method. Samples were characterized by various techniques such as powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS), inductively coupled plasma (ICP) and elemental analysis (EA). Photocatalytic decolorization of methylene blue (MB) dye in the aqueous solutions was examined under UV and visible light irradiation. The degradation of MB solutions was calculated by changes in the UV–Vis absorbencies of the aqueous solutions at λmax = 664 nm. The influence of various parameters such as the catalyst loading, dye concentration, initial pH of the dye solution and adding electron acceptors (H2O2, tert-Butyl hydroperoxide (TBHP), KBrO3, KIO4 and (NH4)2S2O8) on the degradation reaction was studied. Moreover, metal doping can improve the photocatalytic activity of MOF-5 due to the synergistic effect, narrow band gap and so on. The results show that Co/Zn-MOF-5 photocatalyst exhibited better photocatalytic activity than Ni/Zn-MOF-5 and raw MOF-5 for MB decolorization under UV and visible light irradiation. Furthermore, adding different electron acceptors, except TBHP, enhanced the photocatalytic performance of photocatalysts with a different rate. Also, kinetic studies revealed that the reactions follow pseudo-first-order. Additionally, bimetallic MOF-5s did not show obvious activity reduction in MB decolorization during five recycling usages.

In this study, the adsorption of methylene blue (MB) dye has been studied with modified Fe-MOF-5 and MOF-5, synthesized at room temperature by direct mixing approach. The morphology and physicochemical properties of prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The removal rate of Fe-MOF-5 was considerably greater MOF-5 which shows the adsorption performance of MOF-5 can be improved through the modification. The influences of various parameters on the adsorption interaction of the prepared compounds were considered in pH value, contact time, temperature, adsorbent dosage and concentration of MB. Consequently, the adsorption kinetics, thermodynamics and isotherms were consistently explored. To predict the adsorption isotherms and to specify the characteristic parameters for process design, four isotherm models such as Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) were applied. The experimental isotherm data were found to fit the Langmuir model properly. Additionally, adsorption kinetic data were tested using pseudo-first-order, pseudo-second-order and Elovich model and were found to be fitted into pseudo-second-order model. The thermodynamic parameters illustrated that the adsorption was a spontaneous and endothermic process.