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A rapid method for the extraction and monitoring of picogram level of silver ions using uniform silanized mesopor (MCM-41) modified by a thiocompound and inductively coupled plasma atomic emission spectrometry (ICP-AES) is presented. The preconcentration factor of the method is 500, and detection limit of the technique for silver is 6.5 pg/ml. The time and the efficiency of the extraction, pH and...
Surface tailoring control was studied using new concept surface-protector (SP) group that can covered a part of surface. In micelle templated silica, cationic surfactant had the role of SP group. Various methods of silylation on the surface coverage was done on the hexagonal micelle templated silicas and the samples was characterized using BET surface measurement, pore size distribution, FT-IR and...
This study introduces the design of an anodic stripping voltammetric (ASV) method for the silver ion determination at a carbon paste electrode (CPE), chemically modified with phenylthiourea-nanoporous silica gel (Tu-SBA-15-CPE). The electroanalytical pro includes two steps: preconcentration of metal ions at an electrode surface, followed by quantification of the accumulated species by differential...
The CaWO 4 :Ln 3+ @SiO 2 (Ln=Tb, Dy and Ho) nanoparticles were synthesized via a combustion process at 800°C, using citric acid as chelating agent and fuel, ammonium nitrate as fuel, boric acid as flux material and silica as supports. The persistent phosphor nanoparticles were characterized by X-ray diffraction (XRD), reflectance UV–vis and fluorescence spectroscopy (PL) and...
Fe 3 O 4 /CMK-3 was prepared by impregnation and used as a catalyst for the direct hydroxylation of benzene to phenol with hydrogen peroxide. The iron species in the prepared catalyst was Fe 3 O 4 because of the partial reduction of iron(III) to iron(II) on the surface of CMK-3. The high catalytic activity of the catalyst arises from the formation of Fe 3 O...
This study investigated the potential use of ethylenediamine functionalized SBA-15 (en-SBA) nanoporous silica compound, in removal and preconcentration of lead and cadmium cations from aqueous solutions. en-SBA was synthesized according to procedure in the literature and the presence of organic groups in the silica framework was demonstrated by FTIR spectrum. The functionalized product showed the...
8-Hydroxyquinoline (8-HQ) was attached to mesoporous silica by sulfonamide bond formation between 8-hydroxyquinoline-5-sulfonyl chloride (8-HQ-SO 2 Cl) and aminopropyl functionalized SBA-15 (designated as SBA-SPS-Q) and then aluminum complexes of 8-HQ was covalently bonded to SBA-SPS-Q using coordinating ability of grafted 8-HQ.The prepared materials were characterized by powder X-ray diffraction...
A novel functionalized SBA-15 mesoporous material was prepared through co-condensation of tetraethylorthosilicate with an 8-hydroxyquinoline-5-sulfonamide-modified organosilane precursor in the presence of P123 as structure-directing agent. After removal of template, the obtained material was characterized by powder X-ray diffraction (XRD), nitrogen adsorption–desorption, Fourier transform infrared...
Silica gel as an accessible substrate with high surface area can be modified by propyl sulfonic acid. Silica-functionalized sulfonic acid (SiO 2 -Pr-SO 3 H) as a highly efficient heterogeneous solid acid catalyst catalyzes various organic reactions and can be removed easily, recovered and reused without significant loss of activity. In this review, preparation and application of SiO...
The present study deals with the functionalization of mesoporous silica nanoparticles as drug delivery systems. Mono, di, and tri amino-functionalized SBA-15 nanorods were synthesized by post-grafting method using (3-aminopropyl) triethoxysilane, N -(2-aminoethyl-)3- aminopropyltrimethoxysilane, and 3-[2-(2-aminoethylamino) ethylamino] propyl trimethoxysilane, respectively. The...
Sulfonic acid functionalized SBA-15 (SBA-Pr-SO3H) with a pore size of 6nm was proven to be an efficient heterogeneous nanoporous solid acid catalyst in the green one-pot synthesis of triazoloquinazolinones and benzimidazoquinazolinones from the reaction of aromatic aldehydes with 3-amino-1,2,4-triazole (or 2-aminobenzimidazole) and dimedone under solvent free conditions.
A series of 2,5-dioxo-1,2,3,4,5,6,7,8-octahydroquinolines were synthesized through a rapid one-pot four-component reaction in the presence of heterogeneous silica-based sulfonic acid (SiO2–Pr–SO3H) under solvent-free conditions.
The corrosion inhibition of 7-hydroxyphenoxazone was investigated on mild steel (MS) in 1.0 M HCl solution using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) methods. Results obtained reveal that 7-hydroxyphenoxazone is a good inhibitor for MS in 1.0 M HCl solution and its inhibition efficiency is significantly increased by increasing...
Amino-functionalized SBA-15 (SBA-Pr-NH2) with a pore size of 6 nm has been used as an efficient and reusable heterogeneous solid-base catalyst for preparation of 2H-indazolo[2,1-b]phthalazinetrione derivatives. The procedure involves three-component condensation of aromatic aldehydes, dimedone, and phthalhydrazide under solvent-free conditions. The catalyst can be easily removed from the reaction...
For the first time, spironaphthopyrano[1,2-b]indeno-7,3′-indolines were prepared by cyclo-condensation of 1,3-indandione, isatin, and 2-naphthol under solvent-free and catalyst-free conditions. This procedure is not only environmentally benign but is also a simple, one-pot, three-component procedure with the advantages of easy work-up and mild reaction conditions. The same reaction was investigated...
A novel organic-inorganic hybrid optical sensor (SBA-NCO) was designed and synthesized through immobilization of isocyanatopropyl-triethoxysilane and 1-amino-naphthalene onto the surface of SBA-15 by post-grafting method. The characterization of materials using XRD, TEM, N2 adsorption-desorption, and FT-IR techniques confirmed the successful attachment of organic moieties and preserving original structure...
SBA-Pr-NH2 was found to be a sui table and efficient catalyst for the condensation of acenaphthenequinone, malononitrile/ethylcyanoacetate, and α-methylencarbonyl compounds via a simple, facile, efficient and three-component procedure. The corresponding product was found to have a surprising antimicrobial activity. Graphical Abstract
One-pot reaction for the synthesis of symmetrical 2,2-bis(1H-indol-3-yl)-2H-acenaphthen-1-one is reported by condensing acenaphthenequinone and indoles in the presence of catalytic amount of amino-functionalized silica (SBA-Pr-NH2) under solvent-free conditions at 100 °C. Graphical Abstract
In this work, amino-functionalized SBA-15 (SBA-Pr-NH 2 ) has been used as a basic nano-catalyst in the one-pot synthesis of 2-aryloxazolo[4,5- b ]pyridines by the condensation reaction of 2-amino-3-hydroxypyridine and benzoyl chlorides under microwave irradiation in solvent free conditions. Among the advantages of this work are short reaction times, high yields and simple...
Mesoporous silica SBA-15 has been functionalized with sulfonic acid to create highly powerful heterogeneous solid acid catalysts (SBA-Pr-SO 3 H). The catalyst can be easily removed from the reaction mixture by simple filtration, recovered and reused without significant loss of activity. In this review, the catalytic activity of sulfonic acid-functionalized SBA-15 has been widely studied.