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Elham Moniri,Homayon Ahmad Panahi,Meghdad Karimi,Nasir Ahmad Rajabi,Mohammad Faridi,Mahboobeh Manoochehri 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.7
A chelating resin is produced by coupling a dye calcein blue to Amberlite XAD-2 through an azo spacer. The resulting resin has been characterized by FT-IR, elemental analysis, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) studied for the preconcentration and determination of trace Cu(II) from solution samples. The optimum pH for adsorption of copper ions was 6. The sorption capacity of functionalized resin is 27 mg·g^(−1). The chelating resin can be reused for 10 cycles without any significant changes in sorption capacity. A recovery of 100%was obtained for Cu(II) when eluted with 0.5M nitric acid. Scatchard analysis revealed that homogeneous binding sites were formed in the resin. The equilibrium adsorption data of Cu(II) on modified resin were analyzed by Langmuir,Freundlich and Temkin models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants were determined 0.036, 2.196 and 0.348 at pH 6 and 20℃ , respectively. The method was applied for Cu(II) assay in environmental samples.
Samane Karimidost,Elham Moniri,Mahsasadat Miralinaghi 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.7
Single-walled carbon nanotubes (SWCNTs) were functionalized by chitosan and their application was examined in adsorbing an anti-cancer drug, 5-fluorouracil (5Fu). Surface, physical and morphological characteristics of raw SWCNTs and Chitosan-functionalized SWCNTs (Ch-SWCNTs) were extensively characterized by Fourier transform spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), Brunauer-Emmet-Teller (BET) and X-ray diffraction (XRD). The effects of various variables such as pH, initial drug concentration, temperature, and contact time on adsorption capacity were also investigated. Thermodynamic parameters such as So, Ho, and Go were estimated. Isotherm and kinetic studies of drug adsorption indicated that the adsorption process followed Langmuir isotherm model and pseudo-second-order kinetic, respectively. The maximum adsorption capacity (qm) of 5Fu on Ch-SWCNTs was 31.77mg g1 at 298 K, pH 4.0, and 120 min, which is higher than adsorption capacity of SWCNTs (4.12mg g1) in the same conditions. The adsorption was spontaneous and exothermic process in nature, with a slight decreasing in entropy.
( Mahsa Pourshaban ),( Elham Moniri ),( Raheleh Safaeijavan ),( Homayon Ahmad Panahi ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.4
We prepared and investigated a biosynthesized nanoparticulate system with high adsorption and release capacity of letrozole. Silver nanoparticles (AgNPs) were biosynthesized using olive leaf extract. Cysteine was capped AgNPs to increase the adsorption capacity and suitable interaction between nanoparticles and drug. Morphology and size of nanoparticles were confirmed using transmission electron microscopy (TEM). Nanoparticles were spherical with an average diameter of less than 100 nm. Cysteine capping was successfully confirmed by Fourier transform infrared resonance (FTIR) spectroscopy and elemental analysis (CHN). Also, the factors of letrozole adsorption were optimized and the linear and non-linear forms of isotherms and kinetics were studied. Confirmation of the adsorption data of letrozole by cysteine capped nanoparticles in the Langmuir isotherm model indicated the homogeneous binding site of modified nanoparticles surface. Furthermore, the adsorption rate was kinetically adjusted to the pseudo-second-order model, and a high adsorption rate was observed, indicating that cysteine coated nanoparticles are a promising adsorbent for letrozole delivery. Finally, the kinetic release profile of letrozole loaded modified nanoparticles in simulated gastric and intestinal buffers was studied. Nearly 40% of letrozole was released in simulated gastric fluid with pH 1.2, in 30 min and the rest of it (60%) was released in simulated intestinal fluid with pH 7.4 in 10 h. These results indicate the efficiency of the cysteine capped AgNPs for adsorption and release of drug letrozole for breast cancer therapy.
Arsalan Ashuri,Mahsasadat Miralinaghi,Elham Moniri 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
A pH-responsive system was prepared by using a magnetic nanocomposite, folic acid-conjugated chitosan(FA-CS) grafted Fe3O4/GO, and then used for loading and controlled release of an anti-cancer drug, gemcitabine (GEM). The successful synthesis of FA-CS/Fe3O4/GO was confirmed by various characterization techniques such as FE-SEM/EDX, TEM, FT-IR, XRD, TGA, VSM, and BET. The nanocomposite had a mesoporous structure with the specific surfacearea of 68.96m2 g1, the pore volume of 0.25 cm3 g1, and the mean pore size of 14.78 nm. The optimum conditionsfor drug loading through adsorption were found to be pH=4, adsorbent dosage of 0.5 g L1, temperature of298 K, and contact time of 45 min. Experimental data indicated that GEM adsorption onto FA-CS/Fe3O4/GO has a satisfactorycorrelation with the pseudo-second-order kinetic and Freundlich isotherm equations. The maximum adsorptioncapacity of GEM was 221.17mg g1 for FA-CS/Fe3O4/GO, which was quite higher than the non-functionalizedFe3O4/GO with the value of 33.99mg g1. Furthermore, the in-vitro drug release profile of GEM from drug-loaded FACS/Fe3O4/GO was studied within 48 hours at 37 oC, and the results indicated a higher drug cumulative release amountin simulated cancer fluid (pH 5.6) compared to simulated human blood fluid (pH 7.4). Also, the Peppas-Sahlin kineticmodel best fitted the release kinetics data. The result of drug release implied that FA-CS/Fe3O4/GO magnetic biocompositecould be a potential carrier for the sustained and controlled release of GEM.
High capacity polymer for nickel determination in environmental samples
Panahi, Homayon Ahmad,Feizbakhsh, Alireza,Dadjoo, Fatemeh,Moniri, Elham Techno-Press 2013 Advances in environmental research Vol.2 No.4
High AA new high capacity sorbent for preconcentration and determination of nickel in environmental samples was synthesized. The sorbent was synthesized by copolymerization of allyl glaycidyl ether / imminodiacetic acid with N,N-dimethylacrylamide as functional monomers in the presence of N,N-bismethylenacryl amid as cross linker and characterized by Fourier transform infra red spectroscopy, elemental analysis, thermogravimetric analysis and scanning electron microscopy. A recovery of 93.6% was obtained for the metal ion with 0.1 M, sulfuric acid as the eluting agent. The sorption capacity of the functionalized sorbent was 55.9 $mgg^{-1}$. The equilibrium sorption data of Ni(II) on polymeric sorbent were analyzed using Langmuir, Freundlich, Temkin and Redlich.Peterson models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants were determined 0.87 (L mg-1), 25.87 ($mgg^{-1}$) $(Lmg^{-1})^{1/n}$ and 171.4 ($Jmol^{-1}$) respectively at pH 4.5 and $20^{\circ}C$.
( Sahar Kamari ),( Homayon Ahmad Panahi ),( Nasim Baimani ),( Elham Moniri ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.3
Using nanotechnology, magnetic nanoparticles of iron oxide were produced via co-precipitation method and followed modification with organic compounds. In the next step, functionalized monomer was provided via coupling β-cyclodextrine and allylamine onto modified magnetic nanoparticles. These nanoparticles were used to establish the adsorption rate of celecoxib. Magnetic nanoparticles are modified by (3-mercaptopropyl)trimethoxysilane. Nano-adsorbent was characterized by analytical and spectroscopic methods, such as Fourier transform infrared spectroscopy, elemental analysis, thermo-gravimetric analysis, and transmission electron microscopy (TEM). Laboratory parameters, such as the kinetics of adsorption isotherms, pH, reaction temperature and capacity were optimized. Finally, by using this nanoadsorbent in the optimized condition, extraction of celecoxib from biological samples as urine, drug matrix and blood plasma was carried out by high performance liquid chromatography with sensitivity and high accuracy.
Homayon Ahmad Panahi,Mahshid Nikpour Nezhati,Elham Moniri,Somayeh Rangbar Kelahrodi,Farah Assadian,Meghdad Karimi 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4
A new chelating resin was prepared by coupling Amberlite XAD-4 with phenol through an azo spacer,then modified by allyl bromide and characterized (by elemental analysis and IR) and studied for preconcentration of Cu(II) using flame atomic absorption spectrometry (FAAS) for metal monitoring. The optimum pH value for sorption of the above mentioned metal ion was 4.5. The resin was subjected to chemical evaluation through batch binding and column chromatography of Cu(II). The chelating resin can be reused for 15 cycles of sorption-desorption without any significant change in sorption capacity. A recovery of 98% was obtained for the metal ion with 0.5M HNO3 as eluting agent. The equilibrium adsorption data of Cu(II) on modified resin were analyzed by Langmuir, Freundlich and Temkin models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants were determined to be 0.061, 0.193 and 0.045 at pH 4.5 and 25 oC. The method was applied for the copper determination from industrial waste water sample.
Mahshid Nikpour Nezhati,Gholam Hossein Riazi,Homayon Ahmad Panahi,Elham Moniri,Nasir Ahmad Rajabi,Mohammad Mehdi Sadughi,Natasha Rahmani Zaker,Robab Ardekani,Reihaneh Kooshkestani 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
The sodium salt of di ((1-hydroxy-2-benzothiazolium-1-yl) ethyliden-1,1-H-bisphosphonic acid) orthophosphate was synthesized and its toxicity and viability effects screened on two different human neuroblastoma cell lines. This novel derivative of benzothiazole provides a new compound in connection with research and therapeutic application for tumor cell growth inhibition. Benzothiazole was alkylated in reaction with bromoacetic acid and then converted to its H-bisphosphonic acid derivative in presence of H3PO3/POCl3. The procedure led to formation of two molecules of corresponding H-bisphosphonic acid which attached together via a phosphate bridge. The investigated compound exhibits activities (IC50 value) ranging from 14-23 μM (corresponding to human neuroblastoma SK-BE (2)and SK-NM-C cells).
Homayon Ahmad Panahi,Mahshid Nikpour Nezhati,Rohollah Abedini Kashkoieh,Elham Moniri,Igor Yu. Galaev 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
A chelating matrix prepared by surface grafting of polymer containing a functional monomer, poly[1-(N,Nbis-carboxymethyl)amino-3-allylglycerol-co-methylacrylamide] (poly(AGE/IDA-co-DMAA) onto a modified silica. The silica surface was modified by silylation with 3-mercaptopropyltrimethoxysilane followed by graft polymerization. Monomer of allyl glycidyl ether-iminodiacetic acid was synthesized by reaction of allyl glycidyl ether with iminodiacetic acid. The chelating sorbent can be reused for 15 cycles of sorption-desorption without any significant change in sorption capacity. The profile of cobalt uptake on the sorbent reflects good accessibility of chelating sites in poly(AGE/IDA-co-DMAA)-grafted silica gel. The equilibrium adsorption data of Co(II) on modified sorbent were analyzed by Langmuir, Freundlich, Temkin and Redlich-Peterson models. The method was applied for cobalt ions determination in human plasma and sea water sample with satisfactory results.
Homayon Ahmad Panahi,Amir Abdollah Mehrdad Sharif,Mehrnaz Bigonah,Elham Moniri 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6
Thiourea-formaldehyde chelating resin is synthesized simply and rapidly from thiourea and formaldehyde by condensation polymerization and characterized by IR spectra and studied for the preconcentration and determination of trace Cr(Ⅲ) ion from solution samples. The optimum pH value for sorption of the metal ion was 6.5. The sorption capacity of resin for Cr(Ⅲ) was determined. The chelating resin can be reused for 20 cycles of sorption-desorption without any significant change in sorption capacity. A recovery of 96% was obtained for the metal ion with 0.5M HNO3 as eluting agent. The equilibrium adsorption data of Cr(Ⅲ) on modified resin were analyzed by Langmuir, Freundlich and Temkin models. Based on equilibrium adsorption data the Langmuir, Freundlich and Temkin constants were determined as 0.016, 0.040 and 0.074 at pH 6.5 and 20℃. The method was applied for chromium ion determination from river water sample.