soleiman Rahmani - Academia.edu (original) (raw)
Uploads
Papers by soleiman Rahmani
arXiv: Chemical Physics, 2017
The present paper describes in situ preparation of Ni{\deg} nanoparticles immobilized on acid act... more The present paper describes in situ preparation of Ni{\deg} nanoparticles immobilized on acid activated montmorillonite K10 (Ni{\deg}-Mont) by impregnation of Ni(OAc)2 into nanopores of acid activated montmorillonite K10 followed by polyol reduction. Ni{\deg} NPs was highly dispersed into the initiated mesopores on the surface or inside swelled-interlayers of the examined clay with average size of 10-20 nm. Acid treatment of montmorillonite was carried out with HCl (4 M) under controlled conditions for generation of the desired pore sizes as a host of Ni{\deg} NPs. The prepared Ni{\deg}-Mont was used as a highly efficient heterogeneous catalyst for one-pot synthesis of biscoumarins in 85-95% yields. The reactions were carried out via Knoevenagel condensation of aromatic aldehydes with 4-hydroxycoumarin under microwave irradiation. The Ni{\deg}-Mont catalyst was reused at least for seven times without significant loss of its catalytic activity.
Applied Clay Science, 2020
In this study, the synthesis of new class of the modified montmorillonite with magnetic nanoparti... more In this study, the synthesis of new class of the modified montmorillonite with magnetic nanoparticles and surfactants was studied. The synthesis was carried out via intercalation of a mixture of sodium eicosenoate (SEIA, anionic surfactant) and cetyltrimethylammonium chloride (CTMAC, cationic surfactant) on the surface or within interlamellar spaces of montmorillonite (Mt) and thereafter the immobilization of Fe 3 O 4 MNPs (magnetic nanoparticles) to afford Fe 3 O 4-CTMAC/SEIA-Mt system. Next, the nanocomposite of CTMAC-Mt, SEIA-Mt, CTMAC/SEIA-Mt and CTMAC/SEIA-Fe 3 O 4-Mt (In this case, magnetic montmorillonite was primarily prepared and then modified with a mixture of CTMAC/SEIA surfactants) were also synthesized. The prepared nanocomposite systems were characterized using FT-IR, XRD, SEM, EDX, TGA and VSM analyses and then utilized for the removal of cationic methylene blue (MB) dye from aqueous solutions. Among the examined composite systems, Fe 3 O 4-CTMAC/SEIA-Mt showed a superior adsorption capacity. In this area, the influence of adsorbent dosage, contact time, initial concentration of MB and temperature towards the adsorption of MB on Fe 3 O 4-CTMAC/SEIA-Mt system was also investigated. The obtained results exhibited that the kinetic of adsorption and the model of isotherm obeyed from the pseudo-second order and Langmuir model, respectively. Moreover, Fe 3 O 4-CTMAC/SEIA-Mt system showed an extraordinary adsorption capacity for MB (246 mg g-1). Because of superparamagnetic characteristic of magnetite, the adsorbent of Fe 3 O 4-CTMAC/SEIA-Mt can be easily separated from the reaction mixture by an external magnetic field. Thermodynamic studies also represented that the adsorption of MB on Fe 3 O 4-CTMAC/SEIA-Mt was endothermic and it was carried out as a spontaneous process.
Polyhedron, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Polyhedron, 2019
In this study, synthesis of micro/meso porous acid-activated montmorillonite K10 (H +-Mont) was c... more In this study, synthesis of micro/meso porous acid-activated montmorillonite K10 (H +-Mont) was carried out by the activation of Na +-montmorillonite with HCl (4 M) at the controlled conditions. The prepared H +-Mont clay was then characterized using FT-IR, SEM, EDX, XRD and BET analyses. SEM and BET surface analyses represented that by the acid-activation, adjacent layers of montmorillonite K10 (Mont K10) were exfoliated to tiny segments leading to raise of surface area and total pore volume in H +-Mont system rather than the alone Mont K10. Catalytic activity of the prepared H +-Mont clay was further studied as a potent solid acid catalyst for synthesis of biscoumarin materials via tandem Knoevenagel-Michael reaction of 4-hydroxycoumarin with aromatic aldehydes. All reactions were carried out in a mixture of H 2 O-EtOH (1:1) at room temperature to afford the products in high to excellent yields within 25─50 min.
Current Organic Synthesis, 2019
Aim and Objective: Nowadays, bisdimedones and 1,8-dioxo-octahydroxanthenes are considered as biol... more Aim and Objective: Nowadays, bisdimedones and 1,8-dioxo-octahydroxanthenes are considered as biologically active materials. Due to this, the synthesis of the mentioned materials is the subject of more interest. Although most of the reported methods have their own merits, however, they generally require the use of expensive reagents, hazardous organic solvents, a tedious workup procedure and reduced recyclability of the applied catalyst system. Overcoming of the above mentioned drawbacks, therefore, encouraged us to investigate the capability of nanostructured NiFe2O4@Cu towards the synthesis of bisdimedones and 1,8- dioxo-octahydroxanthenes under green reaction conditions. Materials and Methods: Nanoparticles of NiFe2O4@Cu were prepared via a two-step procedure including the preparation of NiFe2O4 by solid-state grinding of Ni(OAc)2·4H2O and Fe(NO3)3·9H2O in the presence of NaOH followed by the immobilization of Cu(0) on the surface of NiFe2O4 nucleus via hydrazine hydrate reduction...
![Research paper thumbnail of Sulfonyl-bridged (copper-immobilized nickel ferrite) with activated montmorillonite, [(NiFe2O4@Cu)SO2(MMT)]: a new class of magnetically separable clay nanocomposite systems towards Hantzsch synthesis of coumarin-based 1,4-dihydropyridines](https://attachments.academia-assets.com/101953782/thumbnails/1.jpg)
](RSC Advances, 2019
In this study, the synthesis of a new class of magnetic clay-based nanocomposites by bridging of ... more In this study, the synthesis of a new class of magnetic clay-based nanocomposites by bridging of sulfonyl groups between copper-immobilized nickel ferrite (NiFe2O4@Cu) and activated montmorillonite is described.
Research on Chemical Intermediates, 2018
Ni 0 nanoparticles were immobilized on acid-activated montmorillonite (Ni 0-Mont) by anchoring Ni... more Ni 0 nanoparticles were immobilized on acid-activated montmorillonite (Ni 0-Mont) by anchoring Ni(OAc) 2 •4H 2 O on modified micro/mesoporous montmorillonite followed by reduction with ethylene glycol. The prepared clay composite system was then characterized using Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD) analysis, and Brunauer-Emmett-Teller (BET) analysis. SEM analysis revealed perfect dispersion of metallic nickel nanoparticles with size distribution of 6-41 nm on the clay matrix. Micro/mesoporous montmorillonite was prepared by activation of Na +-montmorillonite with HCl (4 M) under controlled conditions. The catalytic activity of the prepared Ni 0-Mont clay was studied in one-pot microwave-assisted synthesis of biscoumarins and bisdimedones via Knoevenagel reaction of aromatic aldehydes with 4-hydroxycoumarin or dimedone in solventfree conditions. All reactions were carried out at room temperature within 5-15 min (for biscoumarins) and 5-20 min (for bisdimedones) to afford the products in high to excellent yield. The reusability of the Ni 0-Mont catalyst was also investigated in seven consecutive cycles, without significant loss of catalytic activity.
Polyhedron, 2019
In this study, the immobilization of sulfonic acid on silica-layered nickel ferrite, NiFe2O4@SiO2... more In this study, the immobilization of sulfonic acid on silica-layered nickel ferrite, NiFe2O4@SiO2@SO3H, was investigated. The sulfonated Ni-nanocatalyst was then characterized using FT-IR, SEM, EDX, XRD and VSM analyses. Catalytic activity of the Ni-nanocomposite was also studied towards Hantzsch synthesis of 1,4-dihydropyridines via one-pot condensation reaction of 1,3-diketones (ethyl acetoacetate or 4-hydroxycoumarin), aromatic aldehydes and aqueous ammonia in H2O (70 °C) as a green solvent. All reactions were carried out within 10-100 min to afford the products in high to excellent yields. The green aspect of this synthetic protocol was more studied by examining the reusability of NiFe2O4@SiO2@SO3H MNPs for seven consecutive cycles without the significant loss of catalytic activity. The current method represents remarkable advantages in terms of mild reaction conditions, using H2O as an environmental-friendly solvent, stability and easy separation of the magnetic nanocatalyst, high yield of products, wide tolerance of starting materials and the perfect reusability of the applied Ni-nanocatalyst.
arXiv: Chemical Physics, 2017
The present paper describes in situ preparation of Ni{\deg} nanoparticles immobilized on acid act... more The present paper describes in situ preparation of Ni{\deg} nanoparticles immobilized on acid activated montmorillonite K10 (Ni{\deg}-Mont) by impregnation of Ni(OAc)2 into nanopores of acid activated montmorillonite K10 followed by polyol reduction. Ni{\deg} NPs was highly dispersed into the initiated mesopores on the surface or inside swelled-interlayers of the examined clay with average size of 10-20 nm. Acid treatment of montmorillonite was carried out with HCl (4 M) under controlled conditions for generation of the desired pore sizes as a host of Ni{\deg} NPs. The prepared Ni{\deg}-Mont was used as a highly efficient heterogeneous catalyst for one-pot synthesis of biscoumarins in 85-95% yields. The reactions were carried out via Knoevenagel condensation of aromatic aldehydes with 4-hydroxycoumarin under microwave irradiation. The Ni{\deg}-Mont catalyst was reused at least for seven times without significant loss of its catalytic activity.
Applied Clay Science, 2020
In this study, the synthesis of new class of the modified montmorillonite with magnetic nanoparti... more In this study, the synthesis of new class of the modified montmorillonite with magnetic nanoparticles and surfactants was studied. The synthesis was carried out via intercalation of a mixture of sodium eicosenoate (SEIA, anionic surfactant) and cetyltrimethylammonium chloride (CTMAC, cationic surfactant) on the surface or within interlamellar spaces of montmorillonite (Mt) and thereafter the immobilization of Fe 3 O 4 MNPs (magnetic nanoparticles) to afford Fe 3 O 4-CTMAC/SEIA-Mt system. Next, the nanocomposite of CTMAC-Mt, SEIA-Mt, CTMAC/SEIA-Mt and CTMAC/SEIA-Fe 3 O 4-Mt (In this case, magnetic montmorillonite was primarily prepared and then modified with a mixture of CTMAC/SEIA surfactants) were also synthesized. The prepared nanocomposite systems were characterized using FT-IR, XRD, SEM, EDX, TGA and VSM analyses and then utilized for the removal of cationic methylene blue (MB) dye from aqueous solutions. Among the examined composite systems, Fe 3 O 4-CTMAC/SEIA-Mt showed a superior adsorption capacity. In this area, the influence of adsorbent dosage, contact time, initial concentration of MB and temperature towards the adsorption of MB on Fe 3 O 4-CTMAC/SEIA-Mt system was also investigated. The obtained results exhibited that the kinetic of adsorption and the model of isotherm obeyed from the pseudo-second order and Langmuir model, respectively. Moreover, Fe 3 O 4-CTMAC/SEIA-Mt system showed an extraordinary adsorption capacity for MB (246 mg g-1). Because of superparamagnetic characteristic of magnetite, the adsorbent of Fe 3 O 4-CTMAC/SEIA-Mt can be easily separated from the reaction mixture by an external magnetic field. Thermodynamic studies also represented that the adsorption of MB on Fe 3 O 4-CTMAC/SEIA-Mt was endothermic and it was carried out as a spontaneous process.
Polyhedron, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Polyhedron, 2019
In this study, synthesis of micro/meso porous acid-activated montmorillonite K10 (H +-Mont) was c... more In this study, synthesis of micro/meso porous acid-activated montmorillonite K10 (H +-Mont) was carried out by the activation of Na +-montmorillonite with HCl (4 M) at the controlled conditions. The prepared H +-Mont clay was then characterized using FT-IR, SEM, EDX, XRD and BET analyses. SEM and BET surface analyses represented that by the acid-activation, adjacent layers of montmorillonite K10 (Mont K10) were exfoliated to tiny segments leading to raise of surface area and total pore volume in H +-Mont system rather than the alone Mont K10. Catalytic activity of the prepared H +-Mont clay was further studied as a potent solid acid catalyst for synthesis of biscoumarin materials via tandem Knoevenagel-Michael reaction of 4-hydroxycoumarin with aromatic aldehydes. All reactions were carried out in a mixture of H 2 O-EtOH (1:1) at room temperature to afford the products in high to excellent yields within 25─50 min.
Current Organic Synthesis, 2019
Aim and Objective: Nowadays, bisdimedones and 1,8-dioxo-octahydroxanthenes are considered as biol... more Aim and Objective: Nowadays, bisdimedones and 1,8-dioxo-octahydroxanthenes are considered as biologically active materials. Due to this, the synthesis of the mentioned materials is the subject of more interest. Although most of the reported methods have their own merits, however, they generally require the use of expensive reagents, hazardous organic solvents, a tedious workup procedure and reduced recyclability of the applied catalyst system. Overcoming of the above mentioned drawbacks, therefore, encouraged us to investigate the capability of nanostructured NiFe2O4@Cu towards the synthesis of bisdimedones and 1,8- dioxo-octahydroxanthenes under green reaction conditions. Materials and Methods: Nanoparticles of NiFe2O4@Cu were prepared via a two-step procedure including the preparation of NiFe2O4 by solid-state grinding of Ni(OAc)2·4H2O and Fe(NO3)3·9H2O in the presence of NaOH followed by the immobilization of Cu(0) on the surface of NiFe2O4 nucleus via hydrazine hydrate reduction...
RSC Advances, 2019
In this study, the synthesis of a new class of magnetic clay-based nanocomposites by bridging of ... more In this study, the synthesis of a new class of magnetic clay-based nanocomposites by bridging of sulfonyl groups between copper-immobilized nickel ferrite (NiFe2O4@Cu) and activated montmorillonite is described.
Research on Chemical Intermediates, 2018
Ni 0 nanoparticles were immobilized on acid-activated montmorillonite (Ni 0-Mont) by anchoring Ni... more Ni 0 nanoparticles were immobilized on acid-activated montmorillonite (Ni 0-Mont) by anchoring Ni(OAc) 2 •4H 2 O on modified micro/mesoporous montmorillonite followed by reduction with ethylene glycol. The prepared clay composite system was then characterized using Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD) analysis, and Brunauer-Emmett-Teller (BET) analysis. SEM analysis revealed perfect dispersion of metallic nickel nanoparticles with size distribution of 6-41 nm on the clay matrix. Micro/mesoporous montmorillonite was prepared by activation of Na +-montmorillonite with HCl (4 M) under controlled conditions. The catalytic activity of the prepared Ni 0-Mont clay was studied in one-pot microwave-assisted synthesis of biscoumarins and bisdimedones via Knoevenagel reaction of aromatic aldehydes with 4-hydroxycoumarin or dimedone in solventfree conditions. All reactions were carried out at room temperature within 5-15 min (for biscoumarins) and 5-20 min (for bisdimedones) to afford the products in high to excellent yield. The reusability of the Ni 0-Mont catalyst was also investigated in seven consecutive cycles, without significant loss of catalytic activity.
Polyhedron, 2019
In this study, the immobilization of sulfonic acid on silica-layered nickel ferrite, NiFe2O4@SiO2... more In this study, the immobilization of sulfonic acid on silica-layered nickel ferrite, NiFe2O4@SiO2@SO3H, was investigated. The sulfonated Ni-nanocatalyst was then characterized using FT-IR, SEM, EDX, XRD and VSM analyses. Catalytic activity of the Ni-nanocomposite was also studied towards Hantzsch synthesis of 1,4-dihydropyridines via one-pot condensation reaction of 1,3-diketones (ethyl acetoacetate or 4-hydroxycoumarin), aromatic aldehydes and aqueous ammonia in H2O (70 °C) as a green solvent. All reactions were carried out within 10-100 min to afford the products in high to excellent yields. The green aspect of this synthetic protocol was more studied by examining the reusability of NiFe2O4@SiO2@SO3H MNPs for seven consecutive cycles without the significant loss of catalytic activity. The current method represents remarkable advantages in terms of mild reaction conditions, using H2O as an environmental-friendly solvent, stability and easy separation of the magnetic nanocatalyst, high yield of products, wide tolerance of starting materials and the perfect reusability of the applied Ni-nanocatalyst.