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Anbiaa M.,Iran University of Science and Technology | Kadkhodazade S.,Research Laboratory of Advanced Materials
Scientia Iranica | Year: 2016

LiCl-doped mesoporous silica MCM-48 with cubic mesostructure, using a different doping concentration of LiCl, has been prepared. The LiCl-MCM-48 type materials were characterized employing XRD, FT-IR, SEM, and nitrogen adsorptiondesorption isotherm. We had the humidity sensors on a ceramic substrate with two Ag-Pd interdigital electrodes with five fingers. The sample with 15 wt% LiCl-doped MCM-48 shows an excellent linearity in the whole humidity range of 11%-97%. It has very good response and recovery time, about 22 and 30 sec, respectively. © 2016 Sharif University of Technology.

Anbia M.,Iran University of Science and Technology | Derakhshan M.,Iran University of Science and Technology | Dehghan R.,Iran University of Science and Technology | Bandarchian F.,Research Laboratory of Advanced Materials
International Journal of Environmental Research | Year: 2015

Ordered mesoporous carbon CMK-3 (OMC) have been synthesized using mesoporous SBA- 15 silica as template and modified with cobalt carbonate. Morphologies and surface texturing of materials were characterized by X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM) and N2 adsorption-desorption isotherms. The cobalt modified ordered mesoporous carbon were found to have a surface area of 490.06m2/g and pore volume of 0.42cm3/g. The adsorption behavior of 1, 10-Phenanthroline (OP) and 2, 2'-bipyridine (BP) on cobalt modified ordered mesoporous carbon (Co+2-OMC) were studied in aqueous system. The parameter such as temperature, contact time and initial OP and BP concentrations was investigated. Batch adsorption studies demonstrate that the cobalt containing CMK-3 has significant capacity for adsorption of OP and BP from aqueous solution. The adsorption processes of OP and BP are tested with langmuir and freundlich isotherm models. According to the langmuir isotherms, the maximum adsorption capacities of OP and BP on Co+2-OMC were 595 and 500 mg/g, respectively. © 2015, University of Tehran. All Rights Reserved.

Anbia M.,Iran University of Science and Technology | Kargosha K.,Research Laboratory of Spectroscopy | Khoshbooei S.,Research Laboratory of Advanced Materials
Chemical Engineering Research and Design | Year: 2014

A novel magnetic functionalized MCM-48 mesoporous silica with amine ({single bond}NH2) and melamine-based dendrimer amines (MDA) were synthesized that can be easily separated from aqueous solutions by applying a magnetic field. The synthesis adsorbent (MDA-magMCM-48) was characterized by low angle XRD, TEM, FT-IR, TGA and N2 adsorption-desorption isotherm techniques. Batch adsorption experiments were carried out to study the sorption behavior of MDA-magMCM-48 toward Pb(II), Cu(II), Cr(VI) and Cd(II) metal ions. The adsorption of metal ions was well modeled by pseudo-second-order model and Langmuir sorption isotherm with maximum adsorption capacities of 127.24, 125.80, 115.60 and 114.08 mg g-1 Pb(II), Cu(II), Cr(VI) and Cd(II) metal ions, respectively. MDA-magMCM-48 was regenerated and found to be suitable for reuse in successive adsorption-desorption cycles for three times without significant loss in adsorption capacity. © 2014 The Institution of Chemical Engineers.

Bandarchian F.,Research Laboratory of Advanced Materials | Anbia M.,Iran University of Science and Technology
Journal of Natural Gas Science and Engineering | Year: 2015

Nanoporous molecular sieve 13X was successfully synthesized through the conventional hydrothermal method by using sodium aluminates as Al source and water-glass solution as an economic reagent for Si source. The hydrothermal reaction was performed under a static condition in an air oven maintained at 90 ± 5 °C for 24 h. Nano molecular sieve was characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and nitrogen adsorption desorption tests. The adsorption capacity of molecular sieve 13X for trace amount of hydrogen sulfide (72 ppm) mixed with propane was investigated using the volumetric method by two different detectors. After adsorption process the amount of H2S in output gas was about 27 ppm and this confirms approximately more than 62% adsorption at 25 bar and 298 K. As compare CO2 adsorption capacity was measured by the same method. The high adsorption capacity of CO2 is attributed to the high micropore volume on 13X sample. Therefore a cost-effective adsorbent was synthesized successfully to separate the small amounts of acidic and corrosive gas (H2S) from propane. © 2015 Elsevier B.V.

Anbia M.,Iran University of Science and Technology | Dehghan R.,Research Laboratory of Advanced Materials
Journal of Environmental Sciences (China) | Year: 2014

Ordered mesoporous carbon (CMK-3) was synthesized and functionalized with 2-amino-5-mercapto-1,3,4-thiadiazole groups (AMT-OCMK-3) for Hg(II) removal from aqueous solution. The modified CMK-3 was characterized by X-ray diffraction, N2 adsorption-desorption isotherm, scanning electron microscopy and Fourier transform infrared spectroscopy. The effects of solution pH, contact time, initial Hg(II) concentration and matrix effect were studied. The adsorption data were successfully fitted with the Langmuir model, exhibiting high adsorption capacity of 450.45mg/g of AMT-OCMK-3. In the solid-phase extraction system a series of experimental parameters such as sample flow rate, sample volume, eluent volume and concentration of the eluent solution have been investigated and established for preconcentration of Hg(II) in aqueous solution. The results showed that the enrichment factor for Hg(II) was 250, the precision (relative standard deviation (RSD), %) for six replicate measurements was 2.05% and the limit of detection for Hg(II) was achieved at 0.17μg/L. © 2014.

Raoof J.B.,University of Mazandaran | Chekin F.,Islamic Azad University at Āmol | Ojani R.,University of Mazandaran | Barari S.,University of Mazandaran | And 2 more authors.
Journal of Solid State Electrochemistry | Year: 2012

In this research, we report an easy method for synthesis of ordered mesoporous carbon (OMC) with hexagonal arrays of tubes (CMK-5). The synthesized OMC was characterized using X-ray diffraction (XRD), scanning electronic microscopy (SEM) and nitrogen sorption isotherms techniques. Due to the large surface area and high conductivity of OMC, OMC-modified glassy carbon (OMCs/GC) electrode was prepared. The unique electrochemical activity of OMCs/GC electrode was illustrated using cyclic voltammetry (CV) and electron impedance spectroscopy (EIS) in which OMC showed a faster electron transfer rate, as compared with glassy carbon electrode. The electrochemical behavior of epinephrine (EN) and acetaminophen (AP) at OMC/GC electrode was also investigated using cyclic voltammetry. The OMC/GC electrode exhibited high electrocatalytic activities toward oxidation of EN and AP and displayed good voltammetric peak separation between them. In differential pulse voltammetry technique, both EN and AP give sensitive oxidation peaks at 120 mV and 320 mV, respectively. Therefore, investigated method was applied for simultaneous determination of EN and AP. AP and EN give linear response over the range of 0.2-15 μM and 4-100 μM, respectively. The lower detection limits were found to be 0.07 μM for AP and 0.94 μM for EN. © Springer-Verlag 2012.

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