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Reza Darvishi Cheshmeh Soltani,Masumeh Mashayekhi,Alireza Khataee,Mohammad-Javad Ghanadzadeh,Mika Sillanpää 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
In the present study, amoxicillin (AMX) solution was treated by the combination of sonocatalysis (ultrasound/MgO nanoparticles) with electrolysis (Pt anode/graphite cathode). The reaction rate of the combined process (5.29 × 10−2 min−1) was over two orders of magnitude higher than that of the sonocatalysis (2.45 × 10−2 min−1). AMX was decomposed synergistically by the hybrid process (synergy percent of about 16%). On the basis of the applied mathematical modeling, an AMX removal efficiency (%) of more than 93% was achieved at Na2SO4 concentration of 0.13 M, current intensity of 0.04 A, MgO nanoparticles dosage of 1.8 g/L and AMX concentration of 11 mg/L.
Preparation and characterization of a novel calcium-conducting polymer inclusion membrane: Part I
Reza Darvishi,Javad karimi Sabet,Mohsen Nasr Esfahany 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.10
The preparation and characterization of a novel type of castor oil-based polymer inclusion membrane (PIM) was investigated, focusing on its flux and selective recovery of Ca2+ over competitive ions such as K+, Na+, and Mg2+. The PIM contains a cross-linked high-molecular-weight green polyol (GPO) as a polymer base, benzene-18crown-6 as a carrier, and an ionic liquid called 1-Butyl-3-methylimidazolium chloride as a plasticizer. GPO was first synthesized by a reaction between an epoxidized castor oil and a cellulose acetate, thereafter, cross-linked by isophorene isocyanate. The base polymer and the prepared PIM were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The FTIR results indicate that oxirane groups in the epoxidized castor oil molecules reacted with the primary hydroxyl groups of cellulose acetate chains. The contact angle measurement hints at the hydrophobic characteristics of the prepared membrane. Compared to the PVC-, CA-, and PVDF-based polymer inclusion membrane, the cured GPO-based PIM, showed higher selectivity and flux of calcium ions with the same composition. The greater stability and significantly higher surface roughness are further favorable features of the novel PIM.
Reza Darvishi Cheshmeh Soltani,Mansoureh Mahmoudi,Grzegorz Boczkaj,Alireza Khataee 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.91 No.-
Herein, we focused on the degradation of acetaminophen (ACT) drug in liquid phase byperoxymonosulfate (PMS) activated by carbon black nano-spheres (CBNS). The nanostructured activatorwas immobilized into calcium alginate hydrogel matrix (CAHM) to avoid the washout of thefinenanostructures. The Langmuir modeling showed an insignificant contribution to the adsorption processin the removal of ACT. The basic pH conditions favored the decomposition of ACT. Among nutrients, thepresence of nitrogenous compounds including nitrite, nitrate and ammonium caused a little decrease inthe reactor performance, while the addition of phosphate ion improved the efficiency from 76.8% to81.9%. The results demonstrated the involvement of both SO4and OH radicals in the degradation ofACT and domination of SO4radicals in the degradation process. Co-immobilization of the CBNS withelectro-synthesized magnetite nanoparticles resulted in not only the enhanced reusability potential butalso improved the efficiency of the treatment process to 95.6%. Mineralization efficiency of the processwas not remarkable; however, the process produced an effluent with lower toxicity toward the microbialcommunity of the activated sludge.
Oxidized gum arabic cross-linked pectin/O-carboxymethyl chitosan: An antibiotic adsorbent hydrogel
Reza Darvishi,Hajar Moghadas,Ali Moshkriz 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5
The current work investigated the synthesis possibility of oxidized gum arabic cross-linked pectin/O-carboxymethylchitosan hydrogels (OGA-Pc-O-CMCS) as a pH-sensitive adsorbent vehicle. During the hydrogel fabrication,the cross-linker oxidized gum arabic (OGA) plays an important role in the enhancement of mechanical stabilityand the structural compactness of the hydrogel. The effect of OGA content, reaction time, reaction temperature, andreaction pH on the hydrogel swelling and crosslink degree was evaluated, modeled, and optimized statistically usingresponse surface methodology (RSM) based on central composite design (CCD). As the pH of pectin/O-Carboxymethylchitosan (Pc-O-CMCS) complexation increased up to 6.0, the swelling degree of the hydrogels decreased regardless ofthe concentration of the OGA. The swelling indices of 101.35% and 70.552% showed the optimum RSM results in theacidic and neutral medium, respectively. The adsorption efficiency of two conventional fluoroquinolones antibiotics(Levofloxacin (LVX) and Delafloxacin (DLX)) in the optimized hydrogel formulations was investigated. The obtainedresults confirmed that OGA concentration was an important parameter in the swelling processes. The adsorptioncapacity of the hydrogels was higher in acidic medium (pH 3.9) compared to natural medium (pH 7.1), which indicatesthe pH-sensitive adsorption behavior of the prepared hydrogel. The maximum antibiotic adsorption occurredafter 12 hours: (66.3-87.5%) and (45-53%) for pH 3.9 and 7.1, respectively. The shape and morphological analysis ofthe beads before and after adsorption was performed using field emission scanning electron microscopy (FE-SEM). The FE-SEM analysis revealed that the shape of the beads changed significantly because of erosion and swelling activityafter antibiotics adsorption. Experimental results exhibited that SIP model fitted best to the isotherm adsorption ofLVX and DLX onto OGA-Pc-O-CMCS hydrogel.
Cyclic behavior of DCFP isolators with elliptical surfaces and different frictions
Gholamreza Abdollahzadeh,Reza Darvishi 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.6
Friction Pendulum isolators are tools developed in the past few decades. The simplest form of these isolators, are FPS whose main disadvantages are having a constant frequency independent of the frequency of the structure. For this reason, researchers have invented VFPI isolator whose frequency is variable and depends on displacement. Another friction pendulum isolator is DCFP isolator which is a combination of two FPS isolators. In this article, first by changing the geometry of DCFP isolator plates from spherical to elliptical, the motion and frequency equations of DVFPI isolators are defined, and then the seismic behavior of DVFPI isolators are analyzed in various geometric and plate friction settings using motion equations, and confirmed using ABAQUS software. The most important results of this study are that the hysteresis behavior of DVFPI isolators are severely nonlinear, its curve follows two distinct curvatures, and that the restoring force is faced with softening mechanism that limits the seismic force transmitted to the structure, whereas the restoring force in DCFP isolators increases linearly with increasing displacement.
( Elham Goodarzi ),( Reza Beiranvand ),( Hasan Naemi ),( Isan Darvishi ),( Zaher Khazaei ) 대한산부인과학회 2020 Obstetrics & Gynecology Science Vol.63 No.4
Objective Anemia is a major problem in developing countries, the purpose of the present study was to investigate the relationship between the human development index (HDI) and the prevalence of anemia among Asian women. Methods This was a descriptive-analytic ecological study. The study analyzed data including HDI and prevalence of anemia extracted from the World Bank. The correlation coefficient and analysis of variance were used for data analysis. The significance level was considered to be less than 0.05. Analyses were performed using Stata-14 software. Results The results revealed that the prevalence of anemia in women of reproductive age (R=-0.626, P<0.001), pregnant women (R=-0.576, P<0.001) and non-pregnant women (R=-0.623, P<0.0001) was significantly negatively correlated with HDI index. In the analysis of HDI components and the prevalence of anemia, a significant negative correlation was observed between the prevalence of anemia and the mean years of schooling, life expectancy at birth, and expected years of schooling indices in all 3 groups of women (non-pregnant, pregnant, and of reproductive age) (P<0.05). Conclusion Since there was a negative correlation between the prevalence of anemia in women and HDI, paying greater attention to factors which influence anemia may contribute to the prevention of anemia in developing countries.
Aydin Hassani,Reza Darvishi Cheshmeh Soltani,Semra Karaca,Alireza Khataee 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
In the present work, adsorption of basic red 46 (BR46) by nano-sized montmorillonite (MMT)/calciumalginate (CA) composite was optimized using central composite design. The maximum dye removal of85.07% was obtained at an initial dye concentration of 30 mg L 1, adsorbent dosage of 2 g L 1, contacttime of 60 min and temperature of 25 8C. The adsorption capacity decreased with decreasing both initialpH and mixing speed. The pseudo-second order kinetic model had the highest correlation coefficient(R2 = 1.00). Based on the Langmuir isotherm model, the maximum adsorption capacity of MMT/CA wasabout 35 mg g 1.
Khataee, Alireza,Darvishi Cheshmeh Soltani, Reza,Hanifehpour, Younes,Safarpour, Mahdie,Gholipour Ranjbar, Habib,Joo, Sang Woo American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.5
<P>Dy-doped ZnO nanoparticles were synthesized with a sonochemical method. X-ray diffraction, inductively coupled plasma, Fourier transform infrared spectroscopy, UV–vis diffuse reflectance spectroscopy, and scanning electron microscopy analyses confirmed the successfully synthesis and nanometric diameter of the samples. Dy-doped ZnO nanoparticles were used for photocatalytic decolorization of C. I. Acid Red 17 solution under visible light irradiation. Among different amounts of dopant agent, 3% Dy-doped ZnO nanoparticles indicated the highest decolorization. Decolorization efficiency increased from 14.3 to 57.0% with an increase in catalyst dosage from 0.25 to 1 g/L, while further increment in the catalyst dosage up to 2 g/L caused an obvious decrease in decolorization efficiency. The addition of 0.1 mM peroxydisulfate (S<SUB>2</SUB>O<SUB>8</SUB><SUP>2–</SUP>) resulted in a decolorization efficiency of nearly 100% after irradiation for 180 min. The trend of inhibitory effect in the presence of different radical scavengers was Cl<SUP>–</SUP> > C<SUB>2</SUB>H<SUB>5</SUB>OH > HCO<SUB>3</SUB><SUP>–</SUP> > CO<SUB>3</SUB><SUP>2–</SUP>.</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie402743u'>ACS Electronic Supporting Info</A></P>
Alireza Khataee,Aydin Hassani,Reza Darvishi Cheshmeh Soltani,Murat Kıranşan,Semra Karaca,Canan Karaca 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.1
The removal of two anionic dyes, C.I. Acid Orange 7 (AO7) and C.I. Acid Red 17 (AR17), by ultrasoundassisted adsorption on the modified nanoclay in aqueous solutions was studied. The modified nanoclay was characterized by SEM/EDX, BET, XRD and FT-IR techniques. The average crystal size for the interlayer spacing of the modified nanoclay was about 14.3 nm. Central composite design (CCD) was used for the optimization of the operational parameters, including the initial dye concentration, sonication time, adsorbent dosage and temperature. The results demonstrated a good agreement between the predicted values obtained by the model and the experimental values for both AO7 (R2= 0.959) and AR17 (R2=0.971).
Saeed Sajjadi,Alireza Khataee,Reza Darvishi Cheshmeh Soltani,Nafiseh Bagheri,Afzal Karimi,Amirali Ebadi Fard Azar 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Here, as-synthesized Fe3O4 nanoparticles were incorporated into the zeolitic imidazolate framework (ZIF-8) lattice to activate sodium percarbonate (SPC) for degradation of methylene blue (MB). The reaction rate constant of Fe3O4@ZIF-8/SPC process (0.0632 min−1) at acidic conditions (pH = 3) was more than six times that of the Fe3O4/SPC system (0.009 min−1). Decreasing the solute concentration, along with increasing SPC concentration and Fe3O4@ZIF-8 nanocomposite (NC) dosage, favored the catalytic degradation of MB. The Fe3O4@ZIF-8 NC after fifteen consecutive treatment processes showed the excellent stability with a negligible drop in the efficiency of the system (<10%). The reaction pathway was obtained via GC–MS analysis.