http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Mohammadreza Eskandarian,Mohammadreza Eskandarian,Javad Zabarjadi,Ali Ehsani,Amirhossein Afshar 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
The recovery of silver from X-ray film processing effluents by precipitation using hydrogen peroxide as the precipitating agent was studied. Response surface methodology (RSM) and central composite design (CCD) were applied to achieve optimum conditions. Linear, square and interactions effects between parameters to study of a second order polynomial equation were obtained. Optimum condition included the volume of H2O2 0.8 ml/min, pH=5.5, ethylene glycol 9 ml in the experimental condition. In these conditions silver recovery percentage was predicted as 92.8%. The experiment was conducted in triplicate under optimized conditions. Silver recovery percentage and average of precipitate were obtained as 91.5% and 423.19mg, respectively, which were close to the predicted amount achieved by the model.
Fatemeh Mahdizadeh,Mohammadreza Eskandarian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Nanoporous SiO2 was synthesized by sol–gel method using dry yeast cells as a template. Additionally, characterization of the biosynthesized nanoporous SiO2 was investigated. Bio-synthesized nanoporous SiO2 has the specific surface area of 460 m2/g and total pore volume of 0.36 cm3/g. Co-immobilization of glucose oxidase and catalase by adsorption method was done on biosynthesized nanoporous SiO2 and immobilized enzymes were used for removal of water dissolved oxygen. Additionally, modeling and optimization for removal of water dissolved oxygen was performed using rotatable response surface methodology (RSM). Experimental values were in good agreement with the predicated ones and the model was highly significant.
Mohammadhossein Rasoulifard,Mostafa Fazli,Mohammadreza Eskandarian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Present work involves the prospects of the kinetic study for photocatalytic degradation of Direct Red 23 using UV–LED/nano-TiO2/S2O8 2 procedure. Advantageously usages of UV–LEDs as illumination sources were collected to the advanced oxidation process in presence of immobilized nano-TiO2. Additionally, kinetic approach for various parameters in different conditions for decolorization has been studied. Results demonstrated that kinetic model of UV–LED/nano-TiO2/S2O8 2 process can effectively degrade DR23 dye with optimum conditions. A new kinetic model was suggested on the basis of intrinsic element reactions. The proposed kinetic model fairly resembled that dye decolorization was followed by the first order reaction.
Shahrzad Arshadi,Javad Moghaddam,Mohammadreza Eskandarian 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
Uptake to cuprous oxide (Cu2O) nanoparticle synthesis with various particle sizes and shapes via supersatu-ration chemistry approach (LaMer model) has been conducted. Ascorbic acid and maltodextrine as reducing agentsand polyvinylpyrrolidone (PVP) as a surfactant were utilized for synthesis of Cu2O nanoparticles in aqueous solution. The narrow particle size range was achieved by controlling the kinetics of nucleation and growth of particles to satisfyLaMer theory. This mean was performed utilizing different reducing agents (ascorbic acid and maltodextrin) and also,changing the reducing agent addition condition. The results showed the reducing agent addition condition, varyingthe size of Cu2O nanoparticles from 89 nm to 74 nm for drop-wisely and at-once routes, respectively. The samples werecharacterized by XRD, SEM, and UV-Vis spectroscopy. The results indicate the shape of as-prepared cuprous oxidenanoparticles have close relationship with thermodynamic and kinetic conditions, and also reducing addition condition.
Saeideh Kamali Moghaddam,Mohammadhossein Rasoulifard,Morteza Vahedpour,Mohammadreza Eskandarian 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.9
The present work deals with the photooxidative degradation of tylosin antibiotic (TYL) in the presenceof potassium peroxydisulfate (K2S2O8) irradiated by UV-C in the presence of immobilized nano silver. Effects of pH,temperature, peroxydisulfate concentration and immobilized nano silver dosage on the degradation efficiency of TYLwere examined. Degradation efficiency was small when the oxidation was carried out in the absence of UV irradiation. Results showed that degradation of TYL increases with temperature, nano Ag and peroxydisulfate initial concentra-tion and decreases with pH. Due to UV/nano Ag/S2O82−processes, more than 90% of TYL can be degraded at roomtemperature in 35 min at an initial concentration of 50 mgl−1. Degradation reaction order of TYL by UV/nano Ag/S2O82−process is 1.89. Meanwhile, the initial rates of degradation in UV/nano Ag/S2O82−processes can be described well bythe Langmuir-Hinshelwood kinetic model.
Shahrzad Arshadi-Rastabidam,Javad Moghaddam,Mohammadreza Eskandarian 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Cuprous oxide (Cu2O) nanoparticles have been successfully synthesized using copper acetate asprecursor via supersaturation theory as a facile rout. Synthesis parameters, such as the reducing agentconcentration, reaction temperature, reaction time, type of the reducing agent and rate of addingreducing agent were investigated. The experimental results indicated that size of the Cu2O nanoparticlesis dependent on the above mentioned parameters. The Cu2O samples were characterized by X-raydiffraction (XRD), scanning electron microscopy (SEM) and also by ultra violet visible spectroscopy(UV–vis). Results showed that temperature has unique influence on to the fabrication of Cu2Onanoparticles which illustrate the higher the temperature of the synthesis the smaller the particleswould be. Rate of reduction was specified as an influential factor in determining the particle sizedistribution. Particles with crystallite size of 74.01 nm were obtained among this study.
Polypyrrole-polyaniline/Fe3O4 magnetic nanocomposite for the removal of Pb(II) from aqueous solution
Seyed Abolfazl Seyed Sadjadi,Amirhossein Afshar,Afsaneh Mollahosseini,Mohammadreza Eskandarian 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2
Lead ion which is engaged in aqueous solution has been successfully removed. A novel technique was utilized for the separation and absorption of Pb(II) ions from aqueous solution. Magnetic Fe3O4 coated with newly investigated polypyrrole-polyaniline nanocomposite was used for the removal of extremely noxious Pb(II). Characteristic of the prepared magnetic nanocomposite was done using X-ray diffraction pattern, Field emission scanning electron microscopy (FE-SEM), Fourier transform-infra red spectroscopy (FT-IR) and energy dispersive x-ray spectroscopy (EDX). Up to 100% adsorption was found with 20mg/L Pb(II) aqueous solution in the range of pH=8-10. Adsorption results illustrated that Pb(II) removal efficiency by the nanocomposite increased with an enhance in pH. Adsorption kinetics was best expressed by the pseudo-second-order rate form. Isotherm data fitted well to the Freundlich isotherm model. Upon using HCl and HNO3, 75% PPy-PAn/Fe3O4 nanocomposite, desorption experiment showed that regenerated adsorbent can be reused successfully for two successive adsorption-desorption cycles without appreciable loss of its original capacity.