Islamic Azad University North Tehran Branch

About: Islamic Azad University North Tehran Branch is a education organization based out in Tehran, Iran. It is known for research contribution in the topics: Adsorption & Catalysis. The organization has 868 authors who have published 968 publications receiving 9987 citations.

Catalyzed Schiff Base synthesis over Bifunctinalized Cobalt/Zinc-Incorporated Mesoporous Silica Nanoparticles under UV irradiation

Abstract: A novel series of the Co/Zn-MSN catalysts with Si/Zn molar ratio of 10 and 1, 3, 5 and 7 wt% Cobalt (denoted by CZ-X-MSN) were synthesized using post-synthesis methods. The samples were characterized by XRD, SEM, FTIR, TEM and nitrogen sorption methods. With a constant Si/Zn ratio, the increase of cobalt species from 1 to 7 wt% led to decrease the catalysts surface area from 408 m2g-1 for CZ-1-MSN to 322 m2g-1 for CZ-7-MSN. The catalyst activities were investigated for Schiff base synthesis by the reaction of cyclohexanone with 2,4-dinitrophenylhydrazine under UV irradiation. The activity of the catalysts in the Schiff base synthesis followed the order of Zn-MSN-10 < CZ-1-MSN < CZ-7-MSN < CZ-3-MSN < CZ-5-MSN. The CZ-5-MSN sample exhibited the highest performance with the conversion and selectivity of cyclohexanone to the Schiff base product were 98 and 97%, respectively, under UV light at 298 K for 10 min. The superior catalytic performance of CZ-5-MSN includes high yield, low reaction temperature, short reaction time and friendly environment. This probably was related to stronger metal-support interaction and metals dispersion. This study provides the new perspective on the synthesis of CZ-X-MSN towards an excellent performance of Schiff base structure under UV irradiation.

A study on effective factors influencing on equity risk in banking industry

Abstract: Article history: Received May 4, 2014 Accepted 24 September 2014 Available online September 27 2014 Measuring the effects of various factors influencing on risk of return in banking system plays essential role on making managerial decisions. This paper investigates the effects of seven factors including equities, leverage, dividend, size, growth domestic products, bank concentration and market return on risk of return in selected banks listed on Tehran Stock Exchange. The study selects the necessary data through financial statements announced on exchange as well as macro-economic figures reported by central bank of Iran to examine the hypotheses of the survey. Using some regression technique, the study has determined that only bank size and growth domestic product influence significantly on risk of return on Tehran Stock Exchange. © 2014 Growing Science Ltd. All rights reserved. Banking industry Risk Stock return

Taguchi Method Approach on Preconcentration and Speciation of Trace Amounts of Inorganic and Organic Selenium in Mushroom Samples with Cloud Point Extraction and Uv-Vis Spectrophotomety

Abstract: A micelle-mediate extraction method was developed for the speciation of selenium in mushroom samples with cloud point extraction (CPE) as a separation and preconcentration method, and determination by UV-visible spectrophotometry. The CPE is based on the complex of Se(IV) with 2,3-diaminonaphthalene (DAN) and then entrapped in non-ionic surfactant, Triton X-114.Taguchi method was used to optimize the main factors affecting CPE efficiency, such as pH of sample solution, concentration of Triton X-114 and DAN, equilibration temperature and time. Under the optimal conditions, the detection limit of this method for Se(IV) is 9 ����� �� , and

A dft study of molybdate-phosphonic acid complex

Abstract: The relative stability of Molybdate-Phosphonic Acid (MPA) Complex in gas phase has been carried out using Density Functional Theory (DFT) methods The methods used for calculations are B3LYP, BP86 and B3PW91, with three series of basis sets: D95**, 6-31+G (d,p) and 6-31++G (d,p) for hydrogen and oxygen atoms; LANL2DZ for Mo and Phosphorus Predicted geometry and relative stability are discussed Equilibrium geometry in the ground electronic state energy has been calculated for 1:1 complex The best result for energetic and geometrical ground state was obtained with Becke3LYP calculations The Basis Set Superposition Error (BSSE) begins to converge for all methods/basis sets For this complex, most levels of theory seem to give reasonable estimates of the known binding energies, but here, too, the BSSE overwhelms the reliability of the binding energies for these basis sets