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Silver and copper nanoparticles stabilized on ionic liquids-functionalized polyhedral oligomeric silsesquioxane (POSS): Highly active and recyclable hybrid catalysts
, Article Polyhedron ; Volume 171 , 2019 , Pages 228-236 ; 02775387 (ISSN) ; Naderahmadian, A ; Eftekhari Sis, B ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Two novel heterogeneous hybrid catalysts were successfully synthesized using octa-aminopropyl polyhedral oligomeric silsesquioxane hydrochloride salt (OA-POSS) and ionic liquids, followed by immobilization of Cu and Ag nanoparticles. The obtained hybrid catalysts, Cu@POSS-ILs and Ag@POSS-ILs, were characterized using FT-IR, SEM, EDX, TEM, XRD and TGA. Catalytic studies demonstrated that Cu@POSS-ILs was an excellent catalyst for click reaction in aqueous medium. Furthermore, Ag@POSS-ILs was also exhibited to be an active catalyst for 4-nitrophenol (4-NP) reduction. Simple preparation and easy catalysts recovery and recyclability of Cu@POSS-ILs and Ag@POSS-ILs for at least 3 and 6 runs,...
Double network hydrogel of sodium alginate/polyacrylamide cross-linked with POSS: Swelling, dye removal and mechanical properties
, Article International Journal of Biological Macromolecules ; Volume 129 , 2019 , Pages 187-197 ; 01418130 (ISSN) ; Akbari, A ; Eftekhari Sis, B ; Sharif University of Technology
Elsevier B.V
2019
Abstract
In this work, for the first time, we presented a novel design strategy to fabricate a new type of Octa-aminopropyl polyhedral oligomeric silsesquioxane hydrochloride salt (OA-POSS)-based Alg/PAAm DN gels, consisting of PAAm gel as the first chemical network and Alg/OA-POSS gel as the second chemical-physical network. Incorporation of OA-POSS nanoparticles with various feed ratio into the second network not only led to form strong coordination interactions but also in comparison to the other Alg/PAAm gels demonstrated superior mechanical properties. pH, temperature, contact time and salt effects parameters were studied on the swelling and dye removal properties of the synthesized DN hybrid...
Silica sulfuric acid as a reusable catalyst for efficient and simple silylation of hydroxyl groups using hexamethyldisilazane (HMDS)
, Article Phosphorus, Sulfur and Silicon and the Related Elements ; Volume 182, Issue 7 , 2007 , Pages 1645-1651 ; 10426507 (ISSN) ; Eftekhari-Sis, B ; Hashemi, M. M ; Sharif University of Technology
2007
Abstract
At room temperature, alcohols and phenols are efficiently protected with hexamethyldisilazane (HMDS) in the presence of silica sulfuric acid in good to excellent yields. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency. Copyright © Taylor and Francis Group, LLC
Solid state oxidation of phenols to quinones with ammonium persulfate/wet SiO2
, Article Journal of Chemical Research ; Issue 3 , 2005 , Pages 160-161 ; 03082342 (ISSN) ; Karimi Jaberi, Z ; Eftekhari Sis, B ; Sharif University of Technology
Scientific Reviews Ltd
2005
Abstract
A solid state method for the oxidation of phenols to quinones is described using ammonium persulfate/wet silica gel as oxidant
Oxidation of benzylic alcohols to carbonyl compounds with hydrogen peroxide catalysed by manganeses chloride supported on montmorillonite K10
, Article Journal of Chemical Research ; Issue 8 , 2005 , Pages 484-485 ; 03082342 (ISSN) ; Khalili, B ; Eftekhari-sis, B ; Sharif University of Technology
Scientific Reviews Ltd
2005
Abstract
Manganeses(II) chloride supported on montmorillonite K10 was found to be an efficient catalysts for the oxidation of alcohols to carbonyl compounds with hydrogen peroxide as oxidant
Catalytic efficacy of an oxido-peroxido tungsten(VI) complex: Synthesis, X-ray structure and oxidation of sulfides and olefins
, Article Journal of Coordination Chemistry ; Volume 66, Issue 11 , Jan , 2013 , Pages 1897-1905 ; 00958972 (ISSN) ; Bagherzadeh, M ; Eftekhari Sis, B ; Ellern, A ; Woo, L. K ; Sharif University of Technology
2013
Abstract
An oxido-peroxido tungsten(VI) complex [WO(O2)L(CH 30H)] using salicylidene benzoyl hydrazine as a tridentate ONO donor Schiff base (H2L) has been synthesized and characterized by elemental analysis, IR, 1H NMR, molar conductance data, and single-crystal X-ray analysis. The complex was used as a catalyst for epoxidation of olefins and oxidation of sulfides. The results show that epoxides and sulfoxides were produced in high yield, turnover number, and selectivity
Stereoselective synthesis ofβ-Amino ketones via direct mannich-type reaction catalyzed with SO 2- 4/TiO 2 and SO 2- 4/nano TiO 2
, Article Synthetic Communications ; Volume 39, Issue 24 , 2009 , Pages 4441-4453 ; 00397911 (ISSN) ; Eftekhari Sis, B ; Mahmodi Hashemi, M ; Farmad, F ; Sharif University of Technology
2009
Abstract
At room temperature, SO 2- 4/nano-TiO 2 efficiently catalyze the direct Mannich-type reaction of varieties of in situ-generated aldimines using aldehydes and anilines with ketones in a three-component reaction under solvent-free conditions. The reaction proceeds rapidly and affords the correspondingβ-amino ketones in good to high yields with good to excellent stereoselectivity. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency
Hexagonal core–shell SiO2[–MOYI]Cl–]Ag nanoframeworks for efficient photodegradation of the environmental pollutants and pathogenic bacteria
, Article Journal of Inorganic and Organometallic Polymers and Materials ; Volume 29, Issue 4 , 2019 , Pages 1314-1323 ; 15741443 (ISSN) ; Asgarpour, F ; Akbari, A ; Eftekhari Sis, B ; Lammel, G ; Sharif University of Technology
Springer New York LLC
2019
Abstract
Hexagonal core–shell SiO2[–MOYI]Cl–]Ag nanoframeworks were synthesized via surface modification of hexagonal silica nanoparticles prepared from perlite (EP) as a cheap and abundant raw material. The prepared samples were well characterized by X-ray diffraction powder (XRD), energy dispersive X-ray (EDX), diffuse reflectance spectroscopy (DRS), Brunauer–Emmett–Teller (BET) specific surface area analysis, fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The XRD patterns confirmed that Ag and AgCl crystalline phases were successfully loaded on the surface. The TEM images were also implied that the...
Novel one-pot, three-component synthesis of new 2-alkyl-5-aryl-(1H)- pyrrole-4-ol in water
, Article Journal of Organic Chemistry ; Volume 73, Issue 6 , 2008 , Pages 2090-2095 ; 00223263 (ISSN) ; Jajarmi, P ; Eftekhari Sis, B ; Hashemi, M. M ; Sharif University of Technology
2008
Abstract
(Chemical Equation Presented) New 2-alkyl-5-aryl-(1H)-pyrrole-4-ol derivatives were synthesized via three-component reaction of β-dicarbonyl compounds with arylglyoxals in the presence of ammonium acetate in water at room temperature. © 2008 American Chemical Society
A novel polymeric catalyst for one-pot synthesis of 3,4-dihydropyrimidin-2- (1h)-ones via biginelli reaction
, Article Acta Chimica Slovenica ; Volume 54, Issue 1 , 2007 , Pages 140-143 ; 13180207 (ISSN) ; Salimi, H ; Barzegar, S ; Eftekhari Sis, B ; Sharif University of Technology
2007
Abstract
Poly(2-acrylamido-2-methyl propane sulphonic acid) crosslinked with N,N′-methylene bisacrylamide catalyses efficiently the three component condensation reaction of an aromatic aldehyde, β-ketoester and urea in refluxing ethanol to afford the corresponding dihydropyrimidinones in high yield
ZrOCl2·8H2O on montmorillonite K10 accelerated conjugate addition of amines to α,β-unsaturated alkenes under solvent-free conditions
, Article Tetrahedron ; Volume 62, Issue 4 , 2006 , Pages 672-677 ; 00404020 (ISSN) ; Eftekhari-Sis, B ; Abdollahifar, A ; Khalili, B ; Sharif University of Technology
2006
Abstract
At room temperature, ZrOCl2·8H2O on montmorillonite K10 efficiently catalyzes conjugate addition of amines to a variety of conjugated alkenes such as α,β-unsaturated carbonyl compounds, carboxylic esters, nitriles and amides under solvent-free conditions. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency. © 2005 Elsevier Ltd. All rights reserved
Solid state oxidation of phenols to quinones with sodium perborate on wet montmorillonite K10
, Article Journal of the Brazilian Chemical Society ; Volume 16, Issue 5 , 2005 , Pages 1082-1084 ; 01035053 (ISSN) ; Eftekhari Sis, B ; Khalili, B ; Karimi Jaberi, Z ; Sharif University of Technology
Sociedade Brasileira de Quimica
2005
Abstract
Phenols were oxidized to quinones using sodium perborate (SPB) on wet montmorillonite as oxidant. The reaction was carried out at ambient temperature on the solid phase under solvent free conditions. ©2005 Sociedade Brasileira de Química
Biocompatible magnetic N-rich activated carbon from egg white biomass and sucrose: Preparation, characterization and investigation of dye adsorption capacity from aqueous solution
, Article Surfaces and Interfaces ; Volume 15 , 2019 , Pages 157-165 ; 24680230 (ISSN) ; Zirak, M ; Zooghi Tejrag, R ; Fathi, A ; Lamei, K ; Eftekhari Sis, B ; Sharif University of Technology
Elsevier B.V
2019
Abstract
In the present work, N-rich activated carbon was synthesized using hydrothermal carbonization of egg white biomass in the presence of sucrose, followed by chemical activation and magnetization of hydrochar in the presence of iron (II) and (III) at NaOH solution. The results showed that the sucrose has a critical role in hydrochar yield by increasing of sucrose content. This claim also proved by SEM analysis, which hydrochar morphology was changed from the layered to fused carbon spheres morphology that confirmed the increasing of nucleation site. The materials were characterized with VSM, SEM, CHN, FTIR, Raman spectroscopy and XRD techniques. Capacity of prepared magnetic activated carbon...
Red mud catalyzed one-pot synthesis of nitriles from aldehydes and hydroxylamine hydrochloride under microwave irradiation
, Article Arkivoc ; Volume 2007, Issue 15 , 2007 , Pages 162-170 ; 1551-7012 (ISSN) ; Azimi, N ; Mohammed Vali, M ; Eftekhari Sis, B ; Hashemi, M. M ; Baniasadi, M. H ; Teimouri, F ; Sharif University of Technology
Arkat
2007
Abstract
Red mud (RM) which emerges as a by-product from the alumina producing process has been used as an efficient catalyst for one-pot direct synthesis of nitrile compounds from aldehydes and hydroxylamine hydrochloride under microwave irradiation. ©ARKAT USA, Inc
The efficient synthesis of carbon–carbon double bonds via Knoevenagel condensation using red mud packed in a column
, Article Green Chemistry Letters and Reviews ; Volume 1, Issue 1 , 2007 , Pages 61-64 ; 17518253 (ISSN) ; Mohammad Vali, M ; Eftekhari Sis, B ; Mahmoodi Hashemi, M ; Baniasadi, M. H ; Sharif University of Technology
2007
Abstract
Red mud (RM) is generated as a by-product during the production of alumina from bauxite ore. In this study, RM packing in a column is used as a catalyst for carbon–carbon double bond formation via Knoevenagel condensation. The reactants are added to the top of the column and then eluted with solvent. The products are collected in high yields and short time. RM packed in a column eliminates a catalyst separation step from the reaction mixture in this work. © 2007 Taylor & Francis Group, LLC