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Khoobi, Mehdi,Ramazani, Ali,Foroumadi, Alireza,Souldozi, Ali,Ś,lepokura, Katarzyna,Lis, Tadeusz,Mahyari, Amir,Shafiee, Abbas,Joo, Sang Woo WILEY‐VCH Verlag 2013 Helvetica chimica acta Vol.96 No.5
<P><B>Abstract</B></P><P>Dialkylammonium dicyano(7‐methyl‐6‐oxo‐6<I>H</I>‐dibenzo[<I>b</I>,<I>d</I>]pyran‐9‐yl)methanides <B>4a</B>–<B>4j</B> are obtained in good yields <I>via</I> a simple reaction between 3‐acetylcoumarins (=3‐acetyl‐2<I>H</I>‐1‐benzopyran‐2‐ones) <B>1</B> and malononitrile (<B>2</B>) in EtOH (<I>Table 1</I>). In this reaction, a charge‐separated zwitterionic salt is formed.</P>
New PLA/PEI-functionalized Fe3O4 nanocomposite: Preparation and characterization
Meisam Shabanian,Mehdi Khoobi,Farideh Hemati,Hossein Ali Khonakdar,Seyed esmaeil Sadat ebrahimi,Udo Wagenknecht,Abbas Shafiee 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
In this work, Fe3O4 nanoparticles were functionalized with hyperbranched polyethylenimine (PEI). The neat Fe3O4 nanoparticles (MNP) and functionalized Fe3O4 (MNP@PEI) were separately incorporated into a polylactic acid (PLA). Compared to the neat MNP, the functionalized nanoparticles (MNP@PEI) had better dispersion in the PLA matrix. The properties of the nanocomposites were strongly related to the dispersion and interaction between the nanoparticles and PLA matrix. The heat barrier effect and high nitrogen content of the MNP@PEI nanoparticles were found to be responsible for the improvement of the thermal and flame resistance properties.
Fariba Sadri,Ali Ramazani,Abdolhossain Massoudi,Mehdi Khoobi,Vahid Azizkhani,Roghayeh Tarasi,Leila Dolatyari,Bong-Ki Min 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
Magnetically nano-CoFe2O4 efficiently catalyzes oxidation of primary and secondary benzylic and aliphatic alcohols to give the corresponding carbonyl products in good yields. The reactions were carried out in an aqueous medium at room temperature in the presence of oxone (potassium hydrogen monopersulfate) as an oxidant. In addition, the catalysts could be reused up to 6 runs without significant loss of activities. Catalyst was characterized by SEM, XRD and IR.
Roghayeh Tarasi,Ali Ramazani,Massomeh Ghorbanloo,Mehdi Khoobi,Hamideh Aghahosseini,주상우,Abbas Shafiee 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.4
The manganese-containing mesoporous nanomaterial (MCM-41@PEIMn) was synthesized and used as a catalyst for the oxidation of cyclohexene, ethyl benzene, and toluene. The mesoporous MCM-41 was prepared via hydrothermal method and then polyethylenimine as a reactive surface modifier was grafted on its surface in the presence of ([3-(2,3-epoxypropoxy)propyl] trimethoxysilane) as a grafting agent. Manganese(ii) acetate was loaded onto the prepared MCM-41@PEI. The MCM-41, MCM-41@PEI, and MCM-41@PEI.Mn were characterized and elucidated by Fourier transform infrared, powder X-ray diffraction, thermogravimetric, N2 adsorption–desorption, energy-dispersive X-ray spectroscopy, scanning electron microscopy, and transmission electron microscopy techniques. The catalytic activity and selectivity of the MCM-41@PEI.Mn in the oxidation of cyclohexene, ethyl benzene, and toluene with 30% aqueous H2O2 as an oxidant were studied. Furthermore, the influences of various parameters such as temperature, oxidant amount, catalyst reusability, and kinds of solvents have been studied. The results showed that the manganese-containing mesoporous nanomaterial was easily separated from the reaction mixture and reused at least five times without noticeable loss of activity.
Farnaz Tahmasebi,Mahmood Alimohammadi,Ramin Nabizadeh,Mehdi Khoobi,Kamaledin Karimian,Ahmad Zarei 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.6
We investigated the removal efficiency of humic acid from aqueous solutions by cotton coated with graphene oxide. This research has been conducted as batch on an experimental scale. A self-arrangement approach was introduced in fabrication of the cotton adsorbent coated with graphene oxide. To determine the effect of parameters, including initial concentration, pH, adsorbent dosage and contact time, central composite design (CCD) was employed in response surface method (RSM). The adsorption kinetics were determined based on different times of adsorption of humic acid. Further, the adsorption isotherms were also examined using different concentrations of humic acid. The results obtained showed that with increasing adsorbent dosage and contact time, the removal efficiency increased, while with increasing pH and initial concentration of humic acid, the removal efficiency decreased. The optimal values based on RSM method were obtained as the following: humic acid initial concentration=13.61mg/L, pH=3.87, adsorbent dosage=0.61 g, and contact time=168.43min. Langmuir isotherm with R2=0.9987 has been the most suitable model for explaining the adsorption process. Investigation of the adsorption kinetics indicated that humic acid adsorption follows pseudo-second-order model (R2=0.9822). The results indicated that the cotton adsorbent coated with graphene oxide has a good potential for removal of humic acid from aqueous solutions. Mechanical flexibility, availability, and low operational energy costs are among the advantages of this method for fabrication of this adsorbent, which can be developed and used for reducing environmental contaminants.
Sadri, Fariba,Ramazani, Ali,Massoudi, Abdolhossain,Khoobi, Mehdi,Azizkhani, Vahid,Tarasi, Roghayeh,Dolatyari, Leila,Min, Bong-Ki Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.7
Magnetically nano-$CoFe_2O_4$ efficiently catalyzes oxidation of primary and secondary benzylic and aliphatic alcohols to give the corresponding carbonyl products in good yields. The reactions were carried out in an aqueous medium at room temperature in the presence of oxone (potassium hydrogen monopersulfate) as an oxidant. In addition, the catalysts could be reused up to 6 runs without significant loss of activities. Catalyst was characterized by SEM, XRD and IR.
Nader Yousefi,Ramin Nabizadeh,Simin Nasseri,Mehdi Khoobi,Shahrokh Nazmara,Amir Hossein Mahvi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
The objective of this research was to use tannic acid (TA) as polyphenol monomer and trimesoyl chloride (TMC) to synthesize the nano-composite membranes and its application for dye removal from water. The combined effects of factors were studied by response surface methodology (RSM). Synthesized membrane was characterized by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and water contact angle measurement. The results showed that monomer concentrations and post treatment (time and temperature) had a significant effect on the membrane synthesis. The predicted optimum operational conditions were initial direct blue 71 concentration of 30.31mg/L; time of 16.96 min, applied pressure of 1.16 bar. Fouling mechanism was pore sealing (n=1.96). The excellent antifouling properties and resistance ability to organic and chemical reagents of the prepared composite nanofiltration membranes caused to suggest this membrane for water treatment.
Farzaneh Haghighian,Sayed Mehdi Ghoreishi,Abdolmohammad Attaran,Fahimeh Zeraatkar Kashani,Asma Khoobi 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.3
Procaine belongs to a type of medicine that excessive dosage creates cardiac arrest and also several allergenic reactions. Thus, continuous monitoring of the drug and its metabolite is necessary for sustainable health management during treatment. The innovative aspect of nanostructure materials has great importance in the advancement of research on modified sensors. In the present study, the electrocatalytic performance of multi-walled carbon nanotubes modified carbon paste electrode was investigated for the simultaneous analysis of procaine hydrochloride and p-aminobenzoic acid with high accuracy and sensitivity. The nanostructured sensor is characterized by microscopic and electrochemical techniques, such as scanning electron microscopy and electrochemical impedance spectroscopy using [Fe(CN)6]3−/4− as the redox probes. The modified sensor shows an improved voltammetric peak current than the unmodified carbon paste electrode. The electrochemical behavior of the modified sensor was studied by cyclic voltammetry and differential pulse voltammetry. The sensor kinetic parameters containing electron transfer rate constant (ks=0.47 s−1) and charge transfer coefficient (α=0.23) were calculated using cyclic voltammetry. The differential pulse voltammetry technique was also investigated in terms of linearity, lower limit of detection, lower limit of quantitation, accuracy and precision, which indicate acceptable results. Under optimized experimental conditions, the concentration linear range for procaine and PABA was obtained in the range of 2.4 to 100.0 µM. The limit of detection values (S/N=3) were calculated to be 62.0 and 49.0 nM for detection of procaine and p-aminobenzoic acid, respectively. Also, the effects of interfering materials, repeatability and stability of the modified sensor were studied. Finally, the proposed sensor was applied for simultaneous and sensitive detection of p-aminobenzoic acid and procaine in real media such as plasma and pharmaceutical products with satisfactory results.
Seyedeh Mahtab Pormazar,Mohammad Hassan Ehrampoush,Mohammad Taghi Ghaneian,Mehdi Khoobi,Parvaneh Talebi,Arash Dalvand 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.1
Humic acids are one type of natural organic matter and precursors of chloro organic compounds that cause a major problematic issue for water treatment plants. In the present study, Hyperbranched polyethylenimine (HPEI) was grafted onto Fe3O4 nanoparticles for HA adsorption from aqueous solution. Fe3O4@HPEI nanoparticles were characterized via TEM, SEM, FTIR, XRD, VSM, and BET analysis. The effects of various operational parameters including initial HA concentration, pH, adsorbent dose, contact time and ionic strength on the HA removal were assessed. According to the obtained statistical model, the optimal condition was acquired at the initial HA concentration 79mg/L, adsorbent dose 0.128 g/L, pH 3 and contact time 29 min, which up to 97.27% HA were adsorbed by Fe3O4@HPEI that was close to the predicted result by the model (95.6%) that confirmed the validity of the selected model. The adsorption data were fitted to the pseudo-second-order kinetic and Freundlich isotherm. Thermodynamic parameters indicated that the adsorption process was spontaneous and endothermic. The fabricated Fe3O4@HPEI nanoparticles could be repeatedly utilized as a suitable adsorbent to remove HA from the aqueous environment.
Roghayeh Tarasi,Masoumeh Alipour,Lena Gorgannezhad,Somaye Imanparast,Aliakbar Yousefi-Ahmadipour,Ali Ramezani,Mohammad Reza Ganjali,Abbas Shafiee,Mohammad Ali Faramarzi,Mehdi Khoobi 한국고분자학회 2018 Macromolecular Research Vol.26 No.8
Three types of improved Fe3O4 magnetic nanoparticles (MNPs), including poly(amidoisophthalicacid) coated magnetite nanoparticles (Fe@PA), cyclodextrin (CD) anchored Fe@PA (Fe@PA-CD), and chitosan (Cs) coated Fe@PA-CD (Fe@PACD- Cs) were successfully developed and characterized. Laccase immobilization onto MNPs was carried out via physical adsorption. The maximal and minimal loading capacity were obtained for Fe@PA and Fe@PA-CD-Cs, respectively. Fe@PA-CDCs- laccase exhibited around 100% of the maximum activity at pH 4 and maintained 70% of its initial activity within the temperature range of 15-55 °C; and Cs coated nanoparticles were more efficient than non-coated. Fe@PA-CD-Cs-laccase maintained 70% of its initial activity up to 12 d from the first day of storage at 25 °C whereas the free laccase, Fe@PA-laccase, and Fe@PA-CD-laccase kept 10%, 28%, and 33% of initial activity, respectively. Furthermore, bio-removal of phenolic compounds was performed by the free and immobilized enzyme. Fe@PA-CD-Cs-laccase showed maximal removal with 96.4% and 85.5% for phenol and bisphenol A, respectively. It seems that Fe@PA-CD-Cs could be an appropriate support for immobilization of other enzymes in various industrial application especially bioremoval of phenolic compounds.