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RISS 인기검색어
- 검색키워드
- 저자 : Hossein Eisazadeh (검색결과 5 건)
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Hossein Eisazadeh,Bahareh Ghobadi Bistouni 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.1
Aniline/acrylonitrile nanocomposites were prepared in aqueous media by using a mixture of K-2Cr_2O_7/K_2S_2O_8as an oxidant in the presence of various surfactants such as poly(vinyl alcohol), hydroxypropylcellulose, and surfactive dopant sodium dodecylbenzenesulfonate. The products were characterized in terms of conductivity, morphology, particle size and chemical structure. The results indicate that the type of surfactant influences the electrical conductivity, size and homogeneity of particles. The FTIR spectra show that the intensity of peaks is related to the type of surfactant.
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Comparison between Various Adsorbents for Direct Blue Dye 14 Removal from Aqueous Solution
Neda Eisazadeh,Hossein Eisazadeh,Moein Ghadakpour 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
In this work, the adsorption potential of various adsorbents was investigated in batch mode study. Polyaniline(PAn) and its nanocomposites were prepared using a novel synthesis method and then used as an adsorbent for removal ofdirect blue dye 14 (DB14). The results were compared with frequently used adsorbents granular activated carbon (GAC) andpowder activated carbon (PAC). Furthermore, the combination of PAn and porous carbon adsorbents was examined. Adsorbents that stand out for high removal efficiency are PAn, polyaniline/hydroxypropylcellulose (PAn-HPC), andpolyaniline/polystyrene (PAn-PS). The results indicate that PAn-PS was an attractive candidate for direct blue dye removal. Therefore, present work focuses on utilization of PAn-PS nanocomposite as an efficient adsorbent for DB14 removal in abatch adsorption system. PS core particles were prepared in microemulsion system and further coated with PAn by in situpolymerization method. The core-shell structure of PAn-PS was confirmed with a field emission scanning electronmicroscope (FESEM). Experiments were carried out as a function of pH, contact time, initial dye concentration, andadsorbent dosage. The adsorption kinetics was found to follow the pseudo-second-order model. The applicability of theFreundlich and Langmuir models was investigated and the equilibrium data were fitted well with the Langmuir model. Design of experiment was used in order to evaluate the interaction effects of all the parameters and analysis of variance(ANOVA) test was used to check the significance of the model. The results demonstrated that PAn-PS can act as anappropriate adsorbent for DB14 removal from aqueous solution.
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Adsorption of manganese ion using polyaniline and it’s nanocomposite: Kinetics and isotherm studies
Milad Hallajiqomi,Hossein Eisazadeh 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-
In this research, the preparation of polyaniline (PAn) nanocomposite as adsorbent and it’s capability in manganese removal was investigated. The PAn nanocomposites were prepared using different kind of surfactants such as hydroxypropylcellulose (HPC), poly (vinyl pyrrolidone) (PVP), poly (vinyl alcohol) (PVA) and poly (ethylene glycol) (PEG) in the presence of KIO3 as an oxidant. The products were characterized in terms of morphology and chemical structure with scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Batch studies were performed to evaluate the influence of various experimental parameters including pH, adsorbent dosage, and contact time. Optimum conditions for manganese removal were found to be pH 10, adsorbent dosage of 10 g/L and equilibrium time 30 min. Also, the kinetic of adsorption system have been studied based on the assumption of pseudo-second order rate law. The experimental results have been analyzed using a pseudo-Langmuir adsorption isotherm and a pseudo-Freundlich adsorption isotherm models. The Freundlich adsorption isotherm model was found to represent the measured sorption data better than Langmuir adsorption isotherm. According to the evaluation using the pseudo-Freundlich model, the monolayer adsorption capacity (qmax) of PAn for manganese ions was obtained to be 50.251 mg/g.
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Removal of arsenic from aqueous solution using polyaniline/rice husk nanocomposite
Mohammad Soleimani Lashkenari,Hossein Eisazadeh,Behzad Davodi 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.7
The present study deals with the adsorption of arsenic ions from aqueous solution on polyaniline/rice husk (PAn/RH) nanocomposite. Batch studies were performed to evaluate the influence of various experimental parameters like pH, adsorbent dosage, contact time and the effect of temperature. Optimum conditions for arsenic removal were found to be pH 10, adsorbent dosage of 10 g/L and equilibrium time 30 minutes. Adsorption of arsenic followed pseudo-second-order kinetics. The equilibrium adsorption isotherm was better described by Freundlich adsorption isotherm model. The adsorption capacity (q_max) of PAn/RH for arsenic ions in terms of monolayer adsorption was 34.48mg/g. The change of entropy (ΔS^0) and enthalpy (ΔH^0) was estimated at −0.066 kJ/(mol K) and −22.49 kJ/mol, respectively. The negative value of the Gibbs free energy (ΔG0) indicates feasible and spontaneous adsorption of arsenic on PAn/RH.
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