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Giahi, M.,Badalpoor, N.,Habibi, S.,Taghavi, H. Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.7
A novel sol-gel method was implied to prepare CuO-doped ZnO nanoparticles. XRD and SEM techniques were used to characterize the CuO-doped ZnO sample. The photocatalytic degradation of Lidocaine HCl was investigated by two methods. The degradation was studied under different conditions such as the amount of photocatalyst, pH of the system, initial concentration, presence of electron acceptor, and presence of anions. The results showed that they strongly affected the photocatalytic degradation of Lidocaine HCl. The photodegradation efficiency of drug increased with the increase of the irradiation time. After 6 h irradiation with 400-W mercury lamp, about 93% removal of Lidocaine HCl was achieved. The degree of photodegradation obtained by Taguchi method compatible with the trial-and-error method showed reliable results.
M. Giahi,N. Badalpoor,S. Habibi,H. Taghavi 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.7
A novel sol-gel method was implied to prepare CuO-doped ZnO nanoparticles. XRD and SEM techniques were used to characterize the CuO-doped ZnO sample. The photocatalytic degradation of Lidocaine HCl was investigated by two methods. The degradation was studied under different conditions such as the amount of photocatalyst, pH of the system, initial concentration, presence of electron acceptor, and presence of anions. The results showed that they strongly affected the photocatalytic degradation of Lidocaine HCl. The photodegradation efficiency of drug increased with the increase of the irradiation time. After 6 h irradiation with 400-W mercury lamp, about 93% removal of Lidocaine HCl was achieved. The degree of photodegradation obtained by Taguchi method compatible with the trial-and-error method showed reliable results.
Aghaie, M.,Giahi, M.,Zawari, M. Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
A new poly (vinyl chloride) (PVC) membrane electrode that is highly selective to $Mn^{+2}$ ions was prepared using N,N'-bis(2'-pyridinecarboxamide)-1,2-ethane ($bpenH_2$) as a suitable neutral carrier. This concentration range ($1.0{\times}10^{-5}$ to $1.0{\times}10^{-1}\;M$) with Nernstian slope of $29.3{\pm}0.5\;mV$ per decade. The detection limit and the response time of electrode were $8.0{\times}10^{-6}\;M$ and (${\leq}15\;s$) respectively. The membrane can be used for more than two months without observing any divergence. The electrodes exhibited excellent selectivity for $Mn^{+2}$ ion over other mono-, di- and trivalent cations. Selectivity coefficients were determined by the matched potential method (MPM). The electrode can be used in the pH range from 4.0 - 9.0. The isothermal coefficient of this electrode amounted to 0.00023 V/$^{\circ}C$. The stability constant (log $K_s$) of the $Mn^{+2}$ - $bpenH_2$ complex was determined at $25^{\circ}C$ by potentiometric titration in mixed aqueous solution. The proposed electrode was applied to the determination of $Mn^{+2}$ ions in real samples.
Marvi, Omid,Giahi, Masoud Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
Various indan-1,3-dione derivatives were synthesized from the reaction of different phthalic anhydrides with diethylmalonate using montmorillonite KSF clay as a recyclable heterogeneous acidic catalyst and microwave irradiation in good yields and short reaction times.
Omid Marvi,Masoud Giahi 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
Various indan-1,3-dione derivatives were synthesized from the reaction of different phthalic anhydrides with diethylmalonate using montmorillonite KSF clay as a recyclable heterogeneous acidic catalyst and microwave irradiation in good yields and short reaction times.
M. Aghaie,M. Giahi,M. Zawari 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
A new poly (vinyl chloride) (PVC) membrane electrode that is highly selective to Mn+2 ions was prepared using N,N'-bis(2'-pyridinecarboxamide)-1,2-ethane (bpenH2) as a suitable neutral carrier. This concentration range (1.0 × 10‒5 to 1.0 × 10‒1 M) with Nernstian slope of 29.3 ± 0.5 mV per decade. The detection limit and the response time of electrode were 8.0 × 10‒6 M and (≤ 15 s) respectively. The membrane can be used for more than two months without observing any divergence. The electrodes exhibited excellent selectivity for Mn+2 ion over other mono-, di- and trivalent cations. Selectivity coefficients were determined by the matched potential method (MPM). The electrode can be used in the pH range from 4.0 - 9.0. The isothermal coefficient of this electrode amounted to 0.00023 V/oC. The stability constant (log Ks) of the Mn+2 - bpenH2 complex was determined at 25 oC by potentiometric titration in mixed aqueous solution. The proposed electrode was applied to the determination of Mn+2 ions in real samples.
Numerical optimization of a vertical axis wind turbine: case study at TMU campus
Seyed Kourosh Mirfazli,Mohammad Hossein Giahi,Ali Jafarian Dehkordi 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.28 No.3
In this paper, the aerodynamic analysis of a vertical axis wind turbine was carried out by CFD approach to optimize the turbine performance. To perform numerical simulation, SST-Transition turbulence model was used, which demonstrated more precise results compared to non-transition models. A parametric study was conducted to optimize the VAWT performance based on the selected model. The investigation of pitch angle changes showed that the highest power produced by the turbine occurs at 2º angle. Considering the effect of the rotor’s arm junction to the airfoil showed that by increasing the distance of the junction from the edge of the airfoil from 25 cm to 40 cm, the power of the turbine increases by 60%. However, further increase in this distance results in power decrease. Based on the proposed numerical model, a case study was conducted to consider the installation of four VAWTs in the southwest corner of the medical science building at TMU campus with a height of 42m. The results of the simulation showed that 8.27 MWh energy is obtainable annually.
A. Almasian,M. Mirjalili,L. Maleknia,M. Giahi 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
For the first time, the ability of dyeing the montmorillonite (Mt) mineral with reactive dye aiming to prepare a newnanopigment was investigated and the optimum conditions were determined. The prepared nanopigment was characterizedby Fourier-transform infrared spectra (FTIR), transmission electron microscope (TEM), Brunauer-Emmett-Teller (BET),reflectance spectrophotometer (RS) and colorimetry analyses. The results showed that the dye molecules were attached to thehydroxyl groups of Mt plates through a covalent linkage. Also, the BET surface area values slightly increased after the dyeingprocess due to the separation of Mt plates and the reduction of particle size because of penetration of dye molecules amongthe plates. Colorimetry analysis revealed that the intercalation of dye molecules was depended on dye concentration andnumber of reactive sites on the Mt surface. The prepared nanopigment was used for dyeing the polyester fabric in highpressure and temperature conditions. The SEM, colorimetry, electromagnetic reflectance, flammability, and TGA tests wereperformed to investigate the properties of fabrics. Results indicated that intercalation of Mt nanopigment in the polyester fiberenhances the flame retardant, electromagnetic reflection and breathability of fabrics. Also, the optimum amount ofnanopigment in the dyeing process was reported. It can be suggested that the prepared fabric can be a good candidate forutilizing in military and electronic aspects.
Removal of acid blue 113 and reactive black 5 dye from aqueous solutions by activated red mud
Mehdi Shirzad-Siboni,양재규,Seyed-Javad Jafari,Omid Giahi,김임순,이승목 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Removal of acid blue 113 (AB113) and reactive black 5 (RB5) dyes from aqueous solutions by activated red mud was investigated at different reaction parameters. Activated red mud has higher removal efficiency for AB113 than that for RB5. This can be explained by a greater molecular size of RB5 than that of AB113 and by different binding affinity with the surface of the activated red mud. Equilibrium data was fitted well with Freundlich isotherm and the kinetic data followed a pseudo second-order model. Maximum adsorption capacity was 83.33 mg/g and 35.58 mg/g at pH 3 for AB113 and RB5, respectively.
Roya Ebrahimi,Afshin Maleki,Yahya Zandsalimi,Reza Ghanbari,Behzad Shahmoradi,Reza Rezaee,Mahdi Safari,주상우,Hiua Daraei,Shivaraju Harikaranahalli Puttaiah,Omid Giahi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
The present study aimed at evaluating the application of tungsten oxide-doped zinc oxide nanoparticlesfor the photocatalytic degradation of Direct Blue 15 dye in a sequencing batch reactor. ZnO nanoparticleswere doped with WO3 through hydrothermal synthesis method. To characterize the synthesizednanoparticles scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy,atomic force microscopy, zeta potential analysis, and ultraviolet–visible spectroscopy were used. Theradiation source in this study wasfive 6 W UV lamps. Operational parameters affecting the process,namely pH, light intensity, dopant percentage, dye concentration, and contact time, were evaluated. Theresults of the present study revealed that the efficiency of the photocatalytic process for the degradationof organic dyes was higher at acidic pH values than neutral or basic values. In addition, upon increasingthe light intensity from 172 to 505 W/m2, the efficacy of dye degradation was enhanced from 27.8 to73.5%. Increasing the concentration of the dopant percentage from 1 to 5% w/v increased the degradationefficacy from 30.69 to 73.1%. Increasing the initial dye concentration from 20 to 100 mg/L decreased thedegradation efficacy from 86.9 to 37.5%. Photocatalytic process using WO3-doped ZnO nanoparticlesfixedon a glass surface thus was proven to show a good efficiency for the degradation of organic dye in aquaticsolutions.