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Open Access Article
1 - Removal of Humic Acids (HAs) in Drinking Water by Adsorption onto Polysulfone/Fe2O3 Mixed Matrix Membrane: Study kinetics and Isotherm Analysis
Moslem Rahmani piani Maryam Abrishamkar Bijan Mombini Godajdar Mina HossieniThe present study delineates the applicability of polysulfone/ X% Fe2O3 mixed matrix membranes as a low-cost and non-toxic natural adsorbent. It was used to remove humic acids (HAs) rapidly from aqueous solutions. The polysulfone/ X% Fe2O3 mixed matrix membranes were ch MoreThe present study delineates the applicability of polysulfone/ X% Fe2O3 mixed matrix membranes as a low-cost and non-toxic natural adsorbent. It was used to remove humic acids (HAs) rapidly from aqueous solutions. The polysulfone/ X% Fe2O3 mixed matrix membranes were characterized by BET, FT-IR, XRD, and SEM. The humic acids (HAs) removal by the developed adsorbent was investigated using the batch adsorption technique and all parameters influencing the removal efficiency such as dose of adsorbent and pH were considered. The optimal conditions for the humicacids (HAs) removal were found to be 5, 120-160 min, 10 mg/L, and 0.1 g for pH, contact time and adsorbent dosage respectively. The rapid adsorption of the humic acids (HAs) is an advantage of this adsorbent. The adsorption capacity of humic acids (HAs) onto polysulfone/ X% Fe2O3 mixed matrix membrane was reasonably constant in the pH range of 5–7 but decreased as the pH exceeded 5. Various isotherm models were used to fit the experimental equilibrium data. Equilibrium data obtained have been fitted to the Langmuir, Freundlich, and Dubinin–Radushkevich adsorptionisotherms. Langmuir's model best fits the experimental results. Kinetic modeling showed that the pseudo-second-order equation was the most appropriate for the description of humic acids (HAs) for PSF, PSF/5% Fe2O3, and PSF/10% Fe2O3 mixed matrix membrane were found to be 13.333, 10.309, and 7.874 mg/g, respectively. The overall results confirmed that polysulfone/ X% Fe2O3 mixed matrix membrane could be a promising adsorbent material for humic acids (HAs) removal from aqueous solutions. Manuscript profile -
Open Access Article
2 - Design and Evaluation an Origanum majorana-Capped AgNPs Sensor: Determination of Trace Megestrol Drug in Urine and Blood Samples using Kinetic Spectrophotometric Method
Zahra Kazemi Farzaneh Marahel Touba Hamoule Bijan Mombeni GoodajdarMegestrol drug is a synthetic steroid progesterone, and it is used as an anti-plasma agent to treat advanced breast cancer or endometriosis. In this study, for determination of megestrol drug in solution using kinetic spectrophotometric method, we prepared a solution of MoreMegestrol drug is a synthetic steroid progesterone, and it is used as an anti-plasma agent to treat advanced breast cancer or endometriosis. In this study, for determination of megestrol drug in solution using kinetic spectrophotometric method, we prepared a solution of Origanum majoranacapped AgNPs utilizing sodium borohydride as a stabilizer sensor. The calibration curve was linear in the range of (0.01 to 10.0 µg L−1). The standard deviation of (1.8%), and detection limit of the method (0.023 µg L−1 in time 8 min, 345 nm) were obtained for Sensor level response Origanum majorana-capped AgNPs with (95%) confidence evaluated. The observed outcomes confirmed the suitability recovery and a very low detection limit for measuring the megestrol drug. The method introduced to measure megestrol drug in real samples such as urine and blood was used and can be used for other drugs and hospital samples. Manuscript profile -
Open Access Article
3 - Choline Chloride-Oxalic Acid as a Deep Eutectic Solvent Promoted Synthesis of Aroylamido Coumarin Derivatives in Excellent Yields
Hamed Asadi Hossein Anaraki-Ardakani Parviz Torabi Narges TaheriAn efficient and green protocol for synthesis of title compounds has been achieved via a one pot, three component reaction of 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one, aryl glyoxals and amides in choline chloride/oxalic acid as a deep eutectic solvent (DES) ha MoreAn efficient and green protocol for synthesis of title compounds has been achieved via a one pot, three component reaction of 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one, aryl glyoxals and amides in choline chloride/oxalic acid as a deep eutectic solvent (DES) has been described. The DES system offers advantages in terms of environmentally benign, biodegradable, short reaction times, high yield and the use of safe and inexpensive components. DES can be easily recovered and can be reused for other runs without any reduction in the activity. Manuscript profile -
Open Access Article
4 - Synthesis and Characterization of New Poly(ether sulfones) from 4,4'-(arylpyridine-2,6-diyl)diphenol and Bis(fluorophenyl)sulfone
Kamran Mahooti Masoud Mokhtary Hassan KefayatiIn this research, a series of new poly(ether sulfone) derivatives were prepared by the direct condensation of 4,4'-(arylpyridine-2,6-diyl)diphenols with bis(fluorophenyl)sulfone in the presence of K2CO3 in DMSO/toluene at 180°C. The synthetic polymers show good solu MoreIn this research, a series of new poly(ether sulfone) derivatives were prepared by the direct condensation of 4,4'-(arylpyridine-2,6-diyl)diphenols with bis(fluorophenyl)sulfone in the presence of K2CO3 in DMSO/toluene at 180°C. The synthetic polymers show good solubility in polar aprotic solvents, such as DMSO, NMP, DMF, as well as in THF. The resulting gel permeation chromatography (GPC) analysis of poly (ether sulfones) indicates moderate molecular weights (Mw) in the range of 1625-4185 g/mol. Using differential scanning calorimetry, the glass transition temperatures of the poly (ether sulfones) were determined to be within the range of 157–181°C.Thermogravimetric analysis data for these polymers showed the 10% weight loss temperatures to be within the range of 177–377°C. The char yields of the polymers at 600°C ranged from about 43–62%. This method provides a simple polymerization process for the convenient preparation of poly(ether sulfones). Manuscript profile -
Open Access Article
5 - Dispersive Micro-Solid-Phase Extraction using Graphene Oxide/Polydopamine-Polyacrylamide Nanocomposite Coupled with HPLC-UV for Determination of Phenobarbital in Plasma Samples
Sima Khiltash Rouhollah Heydari Majid Ramezani Tahereh Momeni IsfahaniGraphene oxide/polydopamine-polyacrylamide nanocomposite was synthesized by a simple method and used as adsorbent for dispersive micro-solid-phase extraction of phenobarbital in plasma samples. The adsorbent was characterized by Fourier-transform infrared spectroscopy, MoreGraphene oxide/polydopamine-polyacrylamide nanocomposite was synthesized by a simple method and used as adsorbent for dispersive micro-solid-phase extraction of phenobarbital in plasma samples. The adsorbent was characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy–energy dispersive spectroscopy and thermal gravimetric analysis. The results show that functionalization of graphene oxide by polymeric materials can enhance the sorption properties and thermal stability of the prepared adsorbent. Influential parameters on the extraction efficiency of Phenobarbital including adsorbent amount, elution solvent and its volume, sorption and desorption times and pH of sample solution were investigated and optimized. Under the optimized conditions, limits of detection and quantitation values were 1.4 and 5ng/mL, respectively. Relative recovery data for several real samples were obtained within the range of 84.0-98.0% with a relative standard deviation less than 7.2%. The proposed method was successfully applied to quantitative determination of phenobarbital in plasma samples. Manuscript profile -
Open Access Article
6 - Preparation Electroanalysis Based on Sensor Nanosheets G-C3N4/CPE for Determination of Amount Hg2+ ion in Water Samples by Square Wave Anodic Stripping Voltammetry (SWASV) Method
Shahnaz Davoudi Mohammad Reza Asghari GanjehThis study describes the construction of a new electrochemical sensor and applies it for the determination of Hg2+ ion. This sensor was prepared using new nanographene on G-C3N4 nanosheets. Although the other methods (gas or liquid chromatographic, electrophoresis, flow MoreThis study describes the construction of a new electrochemical sensor and applies it for the determination of Hg2+ ion. This sensor was prepared using new nanographene on G-C3N4 nanosheets. Although the other methods (gas or liquid chromatographic, electrophoresis, flow injection) for measuring Hg2+ ion have advantages such as excellent accuracy and reproducibility, it has limitations such as long-time measure, high equipment cost. Here, we report the use of an electrochemical approach for analytical determination of Hg2+ ion that takes 120 s. The calibration curve was linear in the range of (0.03 to 33.0 nM). The current response was linearly proportional to the Hg2+ion concentration with a R2~ 0.999. We demonstrated a sensitivity a limit of detection of (0.093 nM). Finally, Sensor nanosheets G-C3N4/CPE has been successfully applied for the determination of Hg2+ ion in different kind of water samples. The method introduced to measure Hg2+ ion in real samples such as water samples was used and can be used for other samples. Manuscript profile
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