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Afkhami, Abbas,Sarlak, Nahid,Zarei, Ali Reza,Madrakian, Tayyebeh Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.6
The partial least squares (PLS-1) calibration model based on spectrophotometric measurement, for the simultaneous determination of sulfite and sulfide is described. This method is based on the difference between the rate of the reaction of sulfide and sulfite with Malachite Green in pH 7.0 buffer solution and at 25 ${^{\circ}C}$. The absorption kinetic profiles of the solutions were monitored by measuring the decrease in the absorbance of Malachite Green at 617 nm in the time range 10-180 s after initiation of the reactions with 2 s intervals. The experimental calibration matrix for partial least squares (PLS-1) calibration was designed with 24 samples. The cross-validation method was used for selecting the number of factors. The results showed that simultaneous determination could be performed in the range 0.030-1.5 and 0.030-1.2 $\mu$g m$L ^{-1}$ for sulfite and sulfide, respectively. The proposed method was successfully applied to simultaneous determination of sulfite and sulfide in water samples and whole human blood.
Afkhami, Abbas,Masahi, Shokofeh,Bahram, Morteza Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.7
In the present work a very simple, sensitive and selective spectrophotometric method for the determination of nitrite in micellar media is described. The method is based on the color reaction of nitrite with p-nitroaniline in the presence of diphenylamine in acid media. In order to remove the extraction step, Triton X-100, a non-ionic surfactant was used as micellar media. The optimum reaction conditions such as acid concentration, reagents concentration and effect of time have been studied and the analytical characteristics of the method such as limit of detection, linear range and molar absorptivity have been obtained. The interference of some anions and cations was also tested. The method was applied to the determination of nitrite in real samples.
Abbas Afkhami,Shadieh Sayari,Razieh Moosavi,Tayyebeh Madrakian 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Nickel zinc ferrite nanocomposite was synthesized and characterized by X-ray diffraction (XRD) analysisand scanning electron microscopy (SEM). The XRD patterns confirmed the synthesis of a singlecrystalline Ni0.5Zn0.5Fe2O4 magnetic nanocomposite. Size of the nanocomposite according to SEM wasobtained around 27 nm. Various anionic and cationic dyes were removed from water solutions using thesynthesized sorbent. The Langmuir adsorption capacities (qmax) was found to be 250.0 mg g 1 forAlizarin, 333.3 mg g 1 for reactive blue and Janus green B, 500 mg g 1 for Congo red, crystal violet andmethyl violet.
Madrakian, Tayyebeh,Afkhami, Abbas,Mohammadnejad, Masoumeh Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.6
A simple, selective and sensitive fluorescence quenching method was developed to the determination Cr(VI). The method is based on the oxidation of $I^-\;to\;{{I_3}^-}$ by Cr(VI) in sulfuric acid solution followed by immediate formation of ion association compound between I3 − and rhodamine 6G in Tween-80 micellar media at room temperature. The influence of several surfactants on rhodamine 6G fluorescence signal was studied; particular attention was paid in the aggregation behavior of rhodamine 6G–Tween-80 system. The experimental parameters (e.g., type of surfactant, reagent concentration) were studied and the optimal conditions were established. The linear calibration graph was obtained in the range 2.0 - 100.0 ng m$L^{-1}$ Cr(VI). The detection limit of the method was 0.37 ng m$L^{-1}$. The relative standard deviation (R.S.D.) is less than 5% (n = 5). The efficiency of the method for the determination of Cr(VI) in the presence of Cr(III) in the sample was investigated. The method was applied successfully to the determination of Cr(VI) and total Cr in water, and liver tissue samples.
Tayyebeh Madrakian,Abbas Afkhami,Masoumeh Mohammadnejad 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.6
A simple, selective and sensitive fluorescence quenching method was developed to the determination Cr(VI). The method is based on the oxidation of I− to I3− by Cr(VI) in sulfuric acid solution followed by immediate formation of ion association compound between I3− and rhodamine 6G in Tween-80 micellar media at room temperature. The influence of several surfactants on rhodamine 6G fluorescence signal was studied; particular attention was paid in the aggregation behavior of rhodamine 6G–Tween-80 system. The experimental parameters (e.g., type of surfactant,reagent concentration) were studied and the optimal conditions were established. The linear calibration graph was obtained in the range 2.0 - 100.0 ng mL-1 Cr(VI). The detection limit of the method was 0.37 ng mL-1. The relative standard deviation (R.S.D.) is less than 5% (n = 5). The efficiency of the method for the determination of Cr(VI) in the presence of Cr(III) in the sample was investigated. The method was applied successfully to the determination of Cr(VI) and total Cr in water, and liver tissue samples
Tayyebeh Madrakian,Abbas Afkhami,Borhan Zadpour,Mazaher Ahmadi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
A maghemite nanoparticles modified with homopolymers of a new mercaptoethylamino monomer(MAMNPs) have been prepared. The MAMNPs nanoparticles were fully characterized by FT-IR, XRD, BETand TEM measurements. The influences of parameters including pH, dosage of adsorbent and contacttime have been investigated in order to find the optimum adsorption conditions. Metal ions adsorptionprocess was thoroughly studied from both kinetic and equilibrium points of view. MAMNPs showed hightendency to investigated metal ions, in this order: Ag(I) > Hg(II) > Pb(II) > Cd(II), owing to the strongcontribution of surface loaded polymer.
Pakzad, Peyman,Mofarahi, Masoud,Izadpanah, Amir Abbas,Afkhamipour, Morteza,Lee, Chang-Ha Elsevier 2018 Chemical engineering science Vol.175 No.-
<P><B>Abstract</B></P> <P>In this study, an experimental setup based on the static-synthetic method was used to measure the new experimental data of CO<SUB>2</SUB> solubility in an aqueous solution of 2-amino-2-methyl-1-propanol (AMP) + N-methyl-2-pyrrolidone (NMP) solution. For the static-synthetic method, the mass balance of compositions and the pressure–volume–temperature conditions were used for measuring the amount of absorbed CO<SUB>2</SUB> by the AMP+NMP solution. The measurements were performed over a temperature range of 313.15–353.15 K, CO<SUB>2</SUB> partial pressure up to 316.7 kPa, and in different concentrations of the AMP+NMP solution. Two models, modified Kent–Eisenberg, and Deshmukh–Mather, based on the empirical correlations and activity-fugacity approach, respectively, were used for the prediction of experimental data. The parameters of the equilibrium constants of the protonation and carbamate reactions for the modified Kent–Eisenberg model and the interaction parameters for Deshmukh–Mather model were obtained. For validation of our setup, a new set of experimental data for the solubility of CO<SUB>2</SUB> in an aqueous solution of AMP, methyldiethanolamine (MDEA) and diethanolamine (DEA) were measured and compared with existing experimental data in the literature, and good results were obtained. The results of the modeling study showed that the Deshmukh–Mather model gave a better prediction of experimental CO<SUB>2</SUB> loadings data than the modified Kent–Eisenberg. Also, the results showed that the solubility of CO<SUB>2</SUB> in an aqueous solution of AMP+NMP increases as the CO<SUB>2</SUB> partial pressure increases while the temperature decreases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> New experimental data for CO<SUB>2</SUB> solubility in AMP+NMP+H<SUB>2</SUB>O system was presented. </LI> <LI> Experimental data predicted by modified Kent–Eisenberg and Deshmukh–Mather models. </LI> <LI> Clausius–Clapeyron equation was used for calculation of the absorption heat. </LI> <LI> Deshmukh–Mather model predicted the experimental data with an AARD% of 3.08. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Modeling study on CO2 and H2S simultaneous removal using MDEA solution
Tohid Nejad Ghaffar Borhani,Morteza Afkhamipour,Abbas Azarpour,Vahid Akbari,Seyed Hossein Emadi,Zainuddin A. Manan 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
This study presents a rate-based model of an absorber packed column for simultaneous absorptions ofacid gases into methyldiethanolamine (MDEA) aqueous solution. The model is in good agreement withexperimental data. The parametric study showed that the concentration of acid gases in the sweet gasstream increases by decrease in the specific surface area of packing. The peak of selectivity factordecreases with the increase in the mole ratio of CO2/H2S in the gas feed along the packed column. Thesensitivity analysis reveals that selecting the accurate correlations of the gas-side mass transfercoefficient and specific surface area is vital.