排序方式: 共有14条查询结果,搜索用时 309 毫秒
1.
Mohammad Zaman Kassaee Hassan Masrouri Farnaz Movahedi Reza Mohammadi 《Helvetica chimica acta》2010,93(2):261-264
An efficient solvent‐free method for the synthesis of various 3,4‐dihydropyrimidin‐2(1H)‐ones using TiO2 as a recyclable heterogeneous catalyst is described. Compared to known methods, satisfactory results are obtained with excellent yields, short reaction times, and simplicity in the experimental procedure. 相似文献
2.
Mohammad Ali Karimi Hassan Masrouri Hassan Karami Saeed Andishgar Mehrnaz Alsadat Mirbagheri Tayebe Pourshamsi 《中国化学会会志》2019,66(10):1327-1335
A magnetic metal‐organic framework (MOF) nanocomposite was successfully prepared by a new and green strategy through reasonable design. Magnetic MOF of Fe3O4‐NHSO3H@HKUST‐1 nanocomposite use for removal of lead ions as an environmental pollutant. The experimental results indicated that the nano adsorbent of Fe3O4‐NHSO3H@HKUST‐1 can removed lead ions under optimum operational conditions. The dosage of the nanocomposite, pH of the sample solution, and contact time were obtained to be 10 mg, 7.0, and 90 min, respectively, while the initial concentration of Pb(II) ions of 400 mg/L was used. A kinetic study indicated that a pseudo‐second‐order model agreed well with the experimental data. The isotherm experiments revealed that the Langmuir model attained better fits to the equilibrium data than the Freundlich model. The maximum adsorption capacity of the adsorbent for the removal of lead under the optimum operational conditions of pH 7.0 and temperature 25°C was found to be 384.6 mg/g. The thermodynamic parameters indicate that the adsorption of lead is spontaneous and endothermic. The magnetic MOF nanocomposite could be recovered easily and reused many times without significant loss of its nano‐adsorbent activity. The proposed method is simple, eco‐friendly, low cost, and efficient in the removal of lead ions from aqueous solutions. 相似文献
3.
4.
M. Z. Kassaee Hassan Masrouri Farnaz Movahedi 《Monatshefte für Chemie / Chemical Monthly》2010,36(1):317-322
Abstract
Zinc oxide nanoparticles are used as an effective and reusable catalyst for one-pot, four-component couplings of aldehydes, dimedone, active methylene compounds, and ammonium acetate to produce polyhydroquinoline derivatives under solvent-free conditions at room temperature. Compared with other methods, satisfactory results are obtained with high yields, short reaction times, and simplicity in the experimental procedure. The catalyst could easily be recycled and reused four times without noticeable decrease in catalytic activity. 相似文献5.
6.
Movahedi Farnaz Masrouri Hassan Tayyebi Hanieh 《Research on Chemical Intermediates》2018,44(9):5419-5438
Research on Chemical Intermediates - Graphene oxide (GO) was successfully functionalized with benzoylthiourea groups through a silanization reaction between hydroxyl groups on the surface of GO and... 相似文献
7.
M. Z. Kassaee Hassan Masrouri Farnaz Movahedi Tayyebeh Partovi 《Helvetica chimica acta》2008,91(2):227-231
A convenient one‐pot four‐component synthesis of tetrasubstituted pyrroles was carried out through the reaction of butane‐2,3‐dione with α‐aminophosphorous ylides, obtained in situ from the 1 : 1 : 1 addition reaction between triphenylphosphine, dialkyl acetylenedicarboxylate, and ammonium acetate. 相似文献
8.
TiO2 nanoparticles(TiO2 NPs) worked as an efficient heterogeneous catalyst in a one-pot,three-component,and solvent free Mannich reaction;producing variousβ-aminocarbonyls in good yields,and with good stereoselectivities.The catalyst was easily separated from the reaction mixture and was recycled four times with no significant loss of its catalytic activity. 相似文献
9.
Alireza Amirteimoori Simin Masrouri Feng Yang Sohrab Kordrostami 《The Journal of the Operational Research Society》2017,68(11):1461-1469
In the prior literature on performance measurement of firms with fixed-sum outputs, an equilibrium-efficient frontier is constructed. This paper shows that a single equilibrium-efficient frontier needs a significant trade-off between efficient and inefficient firms, and this may be impossible in practical applications. We develop a data envelopment analysis (DEA) model to construct multiple equilibrium-efficient frontiers in the presence of fixed-sum outputs. The approach uses context-dependent DEA that refers to a DEA approach where a set of firms are assessed against a particular assessment context. Numerical examples are used to illustrate the applicability of the approach. 相似文献
10.