جستجوی مقالات مرتبط با کلیدواژه « یون مس » در نشریات گروه « علوم پایه »

In this study, the two novel modified structures of MCM-41 with furan ring were synthesized for the removal of Cu(II) ions from water. These novel adsorbents were synthesized by amination of MCM-41 using 3-Amino-propyltrimethoxy-silane and 3- (2-aminoethylamino) propyltrimethoxy-silane in the first step, and then using a furfural compound And the condensation reaction, the MCM-41 modified with furan groups, abbreviated as MCM-41@NO and [email protected] and investigation of the adsorbent structure was performed using XRD, FT-IR, and BET. The concentration of soluble ions with Flame Atomic Absorption Spectrometry (FAAS) was determined. The adsorbent efficiency in removing copper ions was studied by examining variables such as adsorbent dose, pH, contact time, and soluble temperature. The equilibrium of adsorption of both absorbents fits into the Freundlich isotherm model. The kinetics study of adsorption shows the second order of kinetics for both absorbents. The study of the adsorption of Cu2+(aq) on the MCM-41@NO by using Monte Carlo molecular mechanics is the innovation of this work. The results of these calculations are compared to experimental results. The results of calculations show that the Cu2+ ions at 1.63Å from the surface of absorbent with 0.75 kcal/mol energy have the maximum probability of distribution.

A novel ethylenediaminetetraacetic acid (EDTA) supported on Fe₃O₄@SiO₂ nanocomposite with a core-shell structure was developed, aiming to remove of copper ions from aqueous media. During the first step, Fe3O4@SiO2 nanosphere core-shell is synthesized using nano-Fe3O4 as the core, TEOS as the silica source and PVA as the surfactant. Then, Fe3O4@SiO2 was coated with ethylenediaminetetraacetic acid. The properties of surface functional groups, crystal structure, magnetism and surface morphology of magnetic nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), dynamic light scattering (DLS) and vibration sample magnetometry (VSM). The effect of parameters influencing adsorption efficiency including adsorbent dosage and contact time of adsorbent on the sorption behavior was assessed and discussed. The adsorption kinetics studies of the novel adsorbent in removing copper ions from waste water showed that the maximum absorption amounts of Cu(П) were 95% at 25⁰C. Desorption and reusability of Fe₃O₄@SiO₂-EDTA was also investigated for tested copper ions based on sequential adsorption desorption cycles. Therefore, all the studied results indicated that Fe₃O₄@SiO₂-EDTA nanocomposites were an efficient and reusable adsorbent for removal of copper ions from aqueous solutions.

The aim of this study was to prepare freeze-dried silk fibroin nanocomposite containing ion copper loaded silk fibroin nanoparticles to induce angiogenesis.

Here, the silk fibroin nanocomposite scaffold containing ion copper was used to induce angiogenesis in endothelial cells. To prepare the silk fibroin nanoparticles containing ion copper, identified amounts of ion copper were added to the fibroin solution. Then, the nanoparticles were embedded in the freeze-dried silk fibroin scaffold. The size and zeta potential, morphology, and the chemical structure of the nanoparticles were measured by dynamic light scattering (DLS), scanning electron microscopy (SEM), and fourier transform infrared spectroscopy (FTIR). Moreover, the release of ion copper from the scaffold and the biocompatibility of the scaffold were evaluated by atomic absorption spectroscopy (AAS) and MTT assay.

The obtained results showed that adding different concentrations of ion copper to fibroin nanoparticles increased the size of the nanoparticles from 128 nm to 185, 220, and 282 nm. Moreover, the growth and proliferation of HUVEC cells on nanocomposites was increased (140%) compared to the control.

It should be concluded that copper ion doped SFNPs could appropriately induce the proliferation of endothelial cells which consequently influence the angiogenesis.

As a result of mining activities in Sungun copper mine at the north of Iran acid mine drainage enters into Pakhirchay river a subbasin of Aras borderline river. In this study using laboratory and modeling studies, optimal method is provided for treating acid mine drainage. First dynamics laboratory model was employed to evaluate zeolite efficiency to remove the copper and then using a static tests the maximum absorption potential was estimated 2.85 mg/L. Thus a zeolite filter with a length of 250 m was considered for removal of copper from the acidic drainage. For simulation copper ion transport HYDRUS 2D model was employed to investigate behavior of contaminants in porous media with a body of zeolite and also evaluate efficiency of zeolite on reducing of copper concentration under various scenarios. First scenario showed for the present condition of the drainage zeolite will decrease Cu concentration down to sub-standard copper concentration (5 mg/L) for two months. In the second scenario, as the worst case scenario, it was assumed that the concentration of copper ion increase 50% of the initial value. The model revealed that filter is able to keep the copper level below the standard level only for a month. Finally, under the last scenario and also the most optimistic one that the entering copper is ceased a month after the implementation of the model, zeolite filter will absorb copper ions for two months, without needing to change the filter material.

α-crystallin is a member of small heat shock protein family (sHSP) which shows both structural and chaperone functions. This protein plays important role in eye lens transparency and indicates protective function in the other tissues. The lenticular levels of copper ions significantly enhance in diabetic patients, aged and cataractous lenses. In eye lenses, the free copper ions induce ascorbic acid auto-oxidation, leading to formation of dehydroascorbic acid and other oxidative products as well as reactive oxygen species. The oxidized forms of ascorbic acid along with the reducing sugars enter into pathological reactions with the eye lens proteins, forming toxic advanced glycation end-products (AGEs). As one of the main components of eye lens antioxidant defense mechanism, glutathione could scavenge the copper ions, inhibiting the formation of reactive oxygen species in eye lenses. In the current study, the structural and functional properties of human αB-crystallin were assessed using different spectroscopic methods. In the presence of copper ions, αB-crystallin exhibited important alterations in both structure and chaperone activity which upturned in the presence of glutathione. Moreover, incubation of human αB-crystallin with copper resulted in significant increase in the protein oligomeric size distribution which largely prevented upon simultaneous incubation with glutathione. Overall, glutathione may scavenge free copper ions in the lenticular tissue, inhibiting their damaging effects on crystallin proteins and other redox-sensitive molecular targets such as ascorbic acid. Our results may introduce a new protective role for glutathione which is highly important in diabetic and aged lenses showing increased levels of copper ions.