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Ali Akbar Safekordi

Bio: Ali Akbar Safekordi is an academic researcher from Islamic Azad University. The author has contributed to research in topics: Adsorption & Solubility. The author has an hindex of 13, co-authored 41 publications receiving 714 citations. Previous affiliations of Ali Akbar Safekordi include Sharif University of Technology & Research Institute of Petroleum Industry.

Papers
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TL;DR: In this article, the authors measured the amount of oil to be sorbed onto the adsorbents used in this study using both static and dynamic methods, and the results obtained were correlated with the first order, second order and intra-particle diffusion models.

164 citations

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TL;DR: In this article, the authors measured the solubility of hydrogen sulfide gas in ionic liquids (ILs) at temperatures from (333.15 to 363.15) K and pressures up to about 2.0 MPa using a volumetric based static apparatus.
Abstract: The solubility of hydrogen sulfide gas in ionic liquids (ILs) 1-ethyl-3-methylimidazolium hexafluorophosphate ([emim][PF6]) at temperatures from (333.15 to 363.15) K and 1-ethyl-3-methylimidazolium bis(trifluoromethyl)sulfonylimide ([emim][Tf2N]) at temperatures ranging from (303.15 to 353.15) K and pressures up to about 2.0 MPa was measured using a volumetric based static apparatus. The solubility data were correlated using two models: the Krichevsky−Kasarnovsky (KK) equation, and the extended Henry’s law combined with the Pitzer’s virial expansion for the excess Gibbs energy. Henry’s law constants (at zero pressure) were obtained at different temperatures from the obtained experimental solubility data. Using the solubility data, the partial molar thermodynamic functions of solution, that is, Gibbs energy, enthalpy, and entropy were calculated. A comparison showed that the solubility of H2S in [emim][Tf2N] is greater than [emim][PF6].

116 citations

Journal ArticleDOI
TL;DR: In this paper, the solubility of hydrogen sulfide in a series of 1-(2-hydroxyethyl)-3-methylimidazolium ([HOemim]+)-based ionic liquids (ILs) containing different anions was measured by a volumetric based static apparatus.

111 citations

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TL;DR: Paenibacillus polymyxa ATCC 21830 was used for the production of curdlan gum for first time and the results showed that the ANN model is much more accurate in prediction as compared to the RSM.

69 citations

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TL;DR: In this article, the experimental data on the sorption capacity of expanded perlite to crude oil were correlated with the equilibrium isotherm of Langmuir, Freudlich, Tempkin and the three parameter Redlich-Peterson isotherms.
Abstract: During the past decades, a significant increase occurred in accidental oil spill in the aquatic environments. In this regard, oil spill in Marine freshwater is still considered as a major environmental hazard. In this research, the experimental data on the sorption capacity of expanded perlite to crude oil were correlated with the equilibrium isotherm of Langmuir, Freudlich, Tempkin and the three parameter Redlich-Peterson isotherms. The results obtained from each specified isotherms were compared and accuracy of the models were favorably discussed. Accuracy of each model using the error function were evaluated. Moreover, the effect of type of objective function on the final results was investigated. To bring up the idea; the sum of square of the average squares of the errors, the sum of the squares of the errors, the hybrid fractional error function, Marquardt’s percent standard deviation and Chi-Square objective function were used and the accuracy was obtained using each objective function. The results showed that the Redlich-Peterson model can better represent the equilibrium isotherm data for the crude oil to be up taken on the expanded perlite.

44 citations


Cited by
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TL;DR: A comprehensive review about the most recent progress in synthesis, characterization, fundamental understanding, and performance of graphene and graphene oxide sponges can be found in this paper, where the technical challenges are discussed, and several future research directions are also suggested.
Abstract: This paper gives a comprehensive review about the most recent progress in synthesis, characterization, fundamental understanding, and the performance of graphene and graphene oxide sponges. Practical applications are considered including use in composite materials, as the electrode materials for electrochemical sensors, as absorbers for both gases and liquids, and as electrode materials for devices involved in electrochemical energy storage and conversion. Several advantages of both graphene and graphene oxide sponges such as three dimensional graphene networks, high surface area, high electro/thermo conductivities, high chemical/electrochemical stability, high flexibility and elasticity, and extremely high surface hydrophobicity are emphasized. To facilitate further research and development, the technical challenges are discussed, and several future research directions are also suggested in this paper.

966 citations

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TL;DR: In this article, spongy graphene (SG), a shape-mouldable and nanoporous material with a high specific surface area used as a versatile and recyclable sorbent material, is proposed and studied.
Abstract: In this work, spongy graphene (SG), a shape-mouldable and nanoporous material with a high specific surface area used as a versatile and recyclable sorbent material, is proposed and studied. SG shows highly efficient absorption of not only petroleum products and fats, but also toxic solvents such as toluene and chloroform (up to 86 times of its own weight), requiring no further pretreatment, which is tens of times higher than that of conventional absorbers. Moreover, SG can be regenerated (>10 times) by heat treatment, yielding the full release of adsorbates (>99%). The present work suggests SG a widespread potential for applications in industry as well as topics regarding environmental protection.

915 citations

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TL;DR: TCF aerogel shows highly efficient sorption of organic liquids and could be regenerated many times without decrease of sorption capacity by distillation, combustion or squeezing, which depends on the type of pollutants.
Abstract: Twisted carbon fiber (TCF) aerogel with good selective sorption is produced in large scale by using raw cotton as the precursor. TCF aerogel shows highly efficient sorption of organic liquids (pump oil: up to 192 times its own weight; chloroform: up to 115 times its own weight). Moreover, it could be regenerated many times without decrease of sorption capacity by distillation, combustion or squeezing, which depends on the type of pollutants.

579 citations

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TL;DR: In this paper, the performance of different types (designs) of MFCs in terms of electric current and power outputs together with the wastewater treatment efficiency, including chemical oxygen demand (COD) removal and columbic efficiency (CE), is presented.

569 citations