Liquid–Liquid Equilibrium and Thermodynamic Modeling of Aqueous Two-Phase System Containing Polypropylene Glycol and NaClO4 at T = (288.15 and 298.15) K

Hamta, Afshin; Mohammadi, Asma; Dehghani, Mohammad Reza; Feyzi, Farzaneh

doi:10.1007/s10953-017-0704-x

Cited by 12 publications

(6 citation statements)

References 49 publications

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“…One of the methods to achieve the ternary phase diagram for polymer solutions is cloud‐point method (CPM). In this method, the polymer solution is mixed with a nonsolvent until it reaches cloud point 13,14 . Cloud point is defined as a condition in which the solution is between a clear solution with the highest percentage of nonsolvent and a cloudy solution with the lowest percentage of nonsolvent 15 …”

Section: Introductionmentioning

confidence: 99%

Manipulating of polyacrylonitrile membrane porosity via SiO₂ and TiO₂ nanoparticles: Thermodynamic and experimental point of view

Hamta

Ashtiani

Karimi

et al. 2020

Polymers for Advanced Techs

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In this work, the membrane formation of the polyacrylonitrile (PAN) was investigated in the presence of different solvents named N‐methyl‐2‐pyrrolidone (NMP) and dimethylformamide (DMF). In this way, two ternary systems water/NMP/PAN and water/DMF/PAN were studied and compared both experimentally and thermodynamically. According to the binodal data, changing the solvent from NMP to DMF could expand the two‐phase region, which was proved by Hansen solubility parameters. The binodal data were predicted and the results showed that the Flory‐Huggins results are in good agreement with experimental data with less than 2% deviation, which is important to have a rational design of porous membrane and appropriate prediction of its morphology. Furthermore, the effects of TiO2 and SiO2 nanoparticles were investigated on dope solution viscosity, thickness, porosity and contact angle of the membranes in both solvents. The results showed that the pattern of changes in characteristics was similar using each nanoparticle. Lower concentrations of nanoparticles enhance the porosity of the membranes and above the optimum amount, adding the NPs leads to decrement the porosity of the nanocomposite membranes. Finally, the fluxes of the manufactured membranes in both cases were examined using distilled water or oil‐in‐water emulsion as feed. The initial permeate flux of oil‐in‐water emulsion was increased from 62 to 73 L m−2 hr−1 using the membrane fabricated by DMF instead of NMP and this fact showed that the PAN membranes potentially can be used for oil/water separation due to the low fouling and hence, the low flux drop during the time.

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Section: Introductionmentioning

confidence: 99%

Manipulating of polyacrylonitrile membrane porosity via SiO₂ and TiO₂ nanoparticles: Thermodynamic and experimental point of view

Hamta

Ashtiani

Karimi

et al. 2020

Polymers for Advanced Techs

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“…Several methods are used for treating methylene blue (MB) in wastewater, including adsorption, liquid–liquid extraction 15 , microbiological or enzymatic decomposition 16 , chemical oxidation 17 , and membrane filtration 18 . Among these, the adsorption method is the most commonly used due to its simplicity, low cost, and high operational life 19 – 21 .…”

Section: Introductionmentioning

confidence: 99%

Isotherms, kinetics and thermodynamic mechanism of methylene blue dye adsorption on synthesized activated carbon

El Jery,

Alawamleh,

Sami

et al. 2024

Sci Rep

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The treatment of methylene blue (MB) dye wastewater through the adsorption process has been a subject of extensive research. However, a comprehensive understanding of the thermodynamic aspects of dye solution adsorption is lacking. Previous studies have primarily focused on enhancing the adsorption capacity of methylene blue dye. This study aimed to develop an environmentally friendly and cost-effective method for treating methylene blue dye wastewater and to gain insights into the thermodynamics and kinetics of the adsorption process for optimization. An adsorbent with selective methylene blue dye adsorption capabilities was synthesized using rice straw as the precursor. Experimental studies were conducted to investigate the adsorption isotherms and models under various process conditions, aiming to bridge gaps in previous research and enhance the understanding of adsorption mechanisms. Several adsorption isotherm models, including Langmuir, Temkin, Freundlich, and Langmuir–Freundlich, were applied to theoretically describe the adsorption mechanism. Equilibrium thermodynamic results demonstrated that the calculated equilibrium adsorption capacity (qe) aligned well with the experimentally obtained data. These findings of the study provide valuable insights into the thermodynamics and kinetics of methylene blue dye adsorption, with potential applications beyond this specific dye type. The utilization of rice straw as an adsorbent material presents a novel and cost-effective approach for MB dye removal from wastewater.

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“…It is worth noting that solving this environmental problem has also caused many economic problems. So far, many methods have been used to remove this type of pollution, including biological (including biological cleaning) [ 3 ], chemical (such as burning in place and using gelling agents) [ 4 ] and physical (including adsorbents, and skimmers) [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and structural investigation of oily wastewater treatment using peach kernel and walnut shell based activated carbon

El Jery,

Khedher,

Mahmood Salman

et al. 2024

PLoS ONE

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Despite the many articles about activated carbon with different precursors in adsorption process, no in-depth research has been carried out to understand the causes of the difference in surface adsorption characteristics of activated carbon with different precursors and different activation processes. In this work, the ability of two active carbon adsorbents made of walnut shell and peach kernel by two chemical and physical methods (totally 4 different types of activated carbon) in treatment of oily wastewater including diesel, gasoline, used oil or engine lubricant has been compared. The results show that the chemical activated peach carbon active with 97% hardness has provided the highest hardness and physical activated walnut carbon active has obtained the lowest hardness value (87%). It is also found that peach activated carbon has a higher iodine number than walnut activated carbon, and this amount can be increased using chemical methods; Therefore, the highest amount of Iodine Number is related to Peach activated carbon that is made by chemical method (1230 mg/g), and the lowest amount of iodine number is seen in walnut activated carbon that is made by physical method (1020 mg/g). moreover, the pore diameter of physical activated carbon is lower than chemical activated carbon in all cases. So that the pore diameter of chemical activated peach carbon active is equal to 22.08 μm and the measured pore diameter of physical activated peach carbon active is equal to 20.42 μm. These values for walnut are obtained as 22.74 μm and 21.86 μm, respectively. Furthermore, the temperature and pH effects on the adsorption of different synthesized oily wastewater was studied and it was found that a decrease in adsorption can be seen with an increase in temperature or decreasing the pH value, which can be referred to this fact that the process of adsorption is an exothermic process. Finally, to analyze the compatibility of adsorption isotherms with experimental data and to predict the adsorption process, three different isotherms named Langmuir, Temkin, and Freundlich isotherms were applied and their parameters were correlated. The correlation results show that the Langmuir isotherm had the best correlation in all cases compared to the Freundlich and Temkin isotherms, based on the correlation coefficient, and the calculated R2 values which was greater than 0.99 in all the studied cases.

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Liquid–Liquid Equilibrium and Thermodynamic Modeling of Aqueous Two-Phase System Containing Polypropylene Glycol and NaClO4 at T = (288.15 and 298.15) K

Cited by 12 publications

References 49 publications

Manipulating of polyacrylonitrile membrane porosity via SiO₂ and TiO₂ nanoparticles: Thermodynamic and experimental point of view

Manipulating of polyacrylonitrile membrane porosity via SiO₂ and TiO₂ nanoparticles: Thermodynamic and experimental point of view

Isotherms, kinetics and thermodynamic mechanism of methylene blue dye adsorption on synthesized activated carbon

Thermodynamic and structural investigation of oily wastewater treatment using peach kernel and walnut shell based activated carbon

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Liquid–Liquid Equilibrium and Thermodynamic Modeling of Aqueous Two-Phase System Containing Polypropylene Glycol and NaClO4 at T = (288.15 and 298.15) K

Cited by 12 publications

References 49 publications

Manipulating of polyacrylonitrile membrane porosity via SiO2 and TiO2 nanoparticles: Thermodynamic and experimental point of view

Manipulating of polyacrylonitrile membrane porosity via SiO2 and TiO2 nanoparticles: Thermodynamic and experimental point of view

Isotherms, kinetics and thermodynamic mechanism of methylene blue dye adsorption on synthesized activated carbon

Thermodynamic and structural investigation of oily wastewater treatment using peach kernel and walnut shell based activated carbon

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Manipulating of polyacrylonitrile membrane porosity via SiO₂ and TiO₂ nanoparticles: Thermodynamic and experimental point of view

Manipulating of polyacrylonitrile membrane porosity via SiO₂ and TiO₂ nanoparticles: Thermodynamic and experimental point of view