فهرست مطالب

Journal of Applied Organometallic Chemistry
Volume:2 Issue: 4, Oct 2022

  • تاریخ انتشار: 1401/07/09
  • تعداد عناوین: 5
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  • Vahid Safari Fard *, Yeganeh Davoudabadi Farahani Pages 165-179
    Nowadays metal-organic frameworks with multiple luminescent centers are very fascinating as multifunctional luminescent material because of their luminescence properties, which could be systematically tuned by deliberate use of organic ligands and metal ions. In this research, we explored a microporous mixed-ligand MOF for highly selective and sensitive detection of metal ions. A two-fold interpenetration pillared-layer amine/imine-functionalized MOF known as TMU-16-NH2, [Zn2(NH2-BDC)2(4-bpdh)]·3DMF, have been synthesized via a mixed ligand approach using amino-1,4-benzenedicarboxylate (NH2-BDC) and 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene (4-bpdh) under solvothermal condition. Sensor TMU-16-NH2 exhibits Al3+-selective TURN-ON and Fe3+-selective TURN-OFF type fluorescence emission responses, for which the electrostatic interaction between Fe3+ and Al3+ ions and the inner surface of the micropores may play a critical role. Moreover, the sensor TMU-16-NH2 shows significantly color change from light yellow to orange and colorless with the addition of Fe3+ and Al3+ ions, respectively, which is distinguished by naked-eye. More significantly, the remarkable quenching and enhancing effects of TMU-16-NH2 for Fe3+ and Al3+ possess the advantages of good selectivity, fast response time (<1min), low-cost, as well as very low detection limits of 0.7 and 0.09 µM for Fe3+ and Al3+, respectively. Interestingly, the probe exhibits high sensitivity for Fe3+ and Al3+ ions, which is far below WHO's acceptable limit in drinking water.
    Keywords: Metal-organic Frameworks, Fluorescence, Sensing, Fe3+, AL3+
  • Elahe Ghiasbeigi, Mohammad Soleiman-Beigi * Pages 180-187
    We have introduced a selective synthesis of tertiary amines using alkyl halide and ammonium salts as the amine sources in water. This green process has outstanding superiorities, such as being eco-friendly, possessing ammonium salts, and using water as a green solvent in the absence of organic ligands or catalysts. It is worth mentioning that the presence of t-Butyl alcohol and potassium hydroxide leads to synthesize tertiary amines, while under other conditions we witnessed the formation of byproducts. Other factors affecting the synthesis of various tertiary amines are temperature ranges. Note that various tertiary amines and the process of scale-up were synthesized in moderate to high yields.
    Keywords: N-alkylation, tertiary amine, ammonium salts, t-Butyl alcohol, Potassium hydroxide
  • Robab Mohammadi * Pages 188-197
    TiO2-SiO2/chitosan nanocomposite was synthesized using simple sonochemical technique. The characteristics of the synthesized nanocomposite were examined by TEM, SEM and EDX analysis. The performance of the prepared TiO2-SiO2/chitosan nanocomposite as efficient sonocatalyst was investigated for the degradation of methyl red. Sonocatalytic degradation of methyl red in the presence of TiO2-SiO2/chitosan nanocomposite could be described via the mechanisms of hot spots and sonoluminescence. The optimized values for main operational parameters were detected as pH of 3, TiO2-SiO2/chitosan dosage of 450 mg/L, methyl red initial concentration of 20 mg/L and ultrasonic power of 300 W. Under optimal conditions, the sonocatalytic degradation of methyl red was 99.1 %. Based on the obtained results, TiO2-SiO2/chitosan nanocomposite could be an excellent selectivity for sonocatalytic degradation of anionic dyes such as methyl red.
    Keywords: TiO2-SiO2, chitosan nanocomposite, sonochemical technique, Sonocatalytic Degradation, Methyl Red
  • Kamal Alizadeh *, Esmail Khaledyan, Yagoub Mansourpanah Pages 198-208
    This reaserch aims at functionalizing magnetic mesoporous silica with methacrylic acid-3-aminopropyltriethoxysilane (Fe3O4@MCM-41@MAA-APTES) applied for removal of methylene blue from aqueous solution. Several variables (such as pH, dye concentration, adsorbent amount and contact time) have been investigated. Under optimum conditions, maximum capacity of 87.71 mg g-1 of MB was obtained for the sorbent. The magnetic mesoporous silica was characterized by SEM, FT-IR, XRD and VSM analyses. The adsorption isotherms were also studied for the sorbent and Langmuir model was found to be more applicable in interpreting MB adsorption on the magnetic nanocomposite silica. The pseudo-second order kinetic model adequately described the kinetic data.
    Keywords: Methylene blue, magnetic mesoporous silica sorbent, Adsorption, Removal, Fe3O4@MCM-41@ MAA-APTES
  • Fatemeh Tavakoli, Hadi Shafiei *, Reza Ghasemikhah Pages 209-217
    The purpose of the present study was investigating kinetic and thermodynamic analysis using eudragit (EUD) polymer as controller to drug release mebendazole. nanofibers containing various proportions of EUD polymer, that were prepared with electrospinning technique.  In this study, the amount of drug mebendazole release was investigated using nanofibers containing EUD at concentrations 50, 250, 500 ppm as controller at 0 -312 time by a Spectrophotometry (UV) method Measured.    For every Nanofiber at 25 °C, 31 °C, 37 °C, and 43 °C, drug release studies were performed for 72 h. The nanofibers of EUD 500ppm, EUD 250 ppm and EUD 50ppm had the highest resistance to drug release, respectively. The results showed that EUD plays a very good role in controlling drug release at the nanofiber. Experimental data were done fitted better with the Sahlin-Peppas model. Kinetic studies have shown that due to the hydrophilic nature of EUD, both diffusion and swelling mechanisms contribute to the drug release process. Thermodynamic analysis showed that drug release leading to increased disorder (ΔS<0) is also an endothermic process (ΔH>0) and at all controlling concentrations is not spontaneous (ΔG>0). As the amount of the controller increases, activation energy increases.
    Keywords: Drug release, Thermodynamics, Kinetic, Electrospinning, eudragit, Mebendazole