Chemical Engineering
Haniyeh Shamsin Beyranvand; Hamid Sarlak
Abstract
In this study, the effect of nanoparticle of graphene oxide and surfactant sodium dodecyl sulfate (sds) 400 ppm on the storage capacity of co2 in hydrate was investigated. A laboratory system was developed for hydrate formation experiments. The experiments were carried out in the range of pressure 36-40 ...
Read More
In this study, the effect of nanoparticle of graphene oxide and surfactant sodium dodecyl sulfate (sds) 400 ppm on the storage capacity of co2 in hydrate was investigated. A laboratory system was developed for hydrate formation experiments. The experiments were carried out in the range of pressure 36-40 bar, temperature range from 273.35 k to 278.65 k, in the presence of graphene oxide and sodium dodecyl sulfate. Experimental results showed that by increasing the pressure at constant temperature for net water, storage capacity increased by 11%, and the storage capacity increased by 14% by decreasing the temperature at the constant pressure (36 bar). Adding sds increased storage capacity by 26%, while adding graphene oxide increased 4.2% of storage capacity. For this purpose, design expert software and response surface test method and historical method were used. Also, a mathematical equation was proposed to estimate the co2 storage capacity in hydrate.
Ayub Parchebaf; Gasem Nojameh
Abstract
In the presented study, a new and efficient sorbent for the removal of Everzol Red 3BS dye from aqueous solutions was prepared by immobilization of 2,4-dinitrophenyl hydrazine (DNPH) on γ-alumina (γ-Al2O3) nanoparticles coated with sodium dodecyl sulfate (DNPH-γ-alumina). ...
Read More
In the presented study, a new and efficient sorbent for the removal of Everzol Red 3BS dye from aqueous solutions was prepared by immobilization of 2,4-dinitrophenyl hydrazine (DNPH) on γ-alumina (γ-Al2O3) nanoparticles coated with sodium dodecyl sulfate (DNPH-γ-alumina). The structure and morphology of the produced sorbents were characterized by Fourier Transform Infrared (FT-IR) and Scanning electron microscopy (SEM). Batch studies were performed to study the effect of various experimental parameters such as contact time, initial dye concentration, adsorbent dose and solution pH on the adsorption process. The experimental data were analyzed using the Langmuir and Freundlich isotherm models. The isotherm studies showed that the adsorption experimental data were fitted by Langmuir isotherm model. The maximum monolayer adsorption capacity (qmax) obtained from the Langmuir model was 10.21 and 86.96 mg/g for Everzol Red 3BS dye on nano-γ-alumina and DNPH modified γ-alumina nanoparticles (DNPH-γ-alumina), respectively. Meanwhile, thermodynamic parameters such as Gibbs free energy (∆G°), enthalpy (∆H°) and entropy (∆S°) were evaluated. We found out that ∆G°, ∆H°, and ∆S° for nano-γ-alumina and DNPH modified γ-alumina nanoparticles (DNPH-γ-alumina) are -11.07 and -4.84 kJ/mol, 1.40and 3.55 kJ/mol, and 0.037 and 0.025 kJ/molK, respectively. The negative values of Gibbs free energy change (∆G°) show that the adsorption was feasible as the spontaneous and positive values of enthalpy change (∆H°) confirm the endothermic adsorption. The obtained results indicate that γ-alumina (γ-Al2O3) nanoparticles modified with 2, 4-dinitrophenyl hydrazine (DNPH- γ-alumina) can be used as an efficient adsorbent material for the adsorption of anionic dyes from aqueous solutions.
Ayub Parchebaf Jadid; Gasem Nojameh
Abstract
In the presented study, a new and efficient sorbent for the removal of Everzol Red 3BS dye from aqueous solutions was prepared by immobilization of 2,4-dinitrophenyl hydrazine (DNPH) on γ-alumina (γ-Al2O3) nanoparticles coated with sodium dodecyl sulfate (DNPH-γ-alumina). ...
Read More
In the presented study, a new and efficient sorbent for the removal of Everzol Red 3BS dye from aqueous solutions was prepared by immobilization of 2,4-dinitrophenyl hydrazine (DNPH) on γ-alumina (γ-Al2O3) nanoparticles coated with sodium dodecyl sulfate (DNPH-γ-alumina). The structure and morphology of the produced sorbents were characterized by Fourier Transform Infrared (FT-IR) and Scanning electron microscopy (SEM). Batch studies were performed to study the effect of various experimental parameters such as contact time, initial dye concentration, adsorbent dose and solution pH on the adsorption process. The experimental data were analyzed using the Langmuir and Freundlich isotherm models. The isotherm studies showed that the adsorption experimental data were fitted by Langmuir isotherm model. The maximum monolayer adsorption capacity (qmax) obtained from the Langmuir model was 10.21 and 86.96 mg/g for Everzol Red 3BS dye on nano-γ-alumina and DNPH modified γ-alumina nanoparticles (DNPH-γ-alumina), respectively. Meanwhile, thermodynamic parameters such as Gibbs free energy (∆G°), enthalpy (∆H°) and entropy (∆S°) were evaluated. We found out that ∆G°, ∆H°, and ∆S° for nano-γ-alumina and DNPH modified γ-alumina nanoparticles (DNPH-γ-alumina) are -11.07 and -4.84 kJ/mol, 1.40and 3.55 kJ/mol, and 0.037 and 0.025 kJ/molK, respectively. The negative values of Gibbs free energy change (∆G°) show that the adsorption was feasible as the spontaneous and positive values of enthalpy change (∆H°) confirm the endothermic adsorption. The obtained results indicate that γ-alumina (γ-Al2O3) nanoparticles modified with 2, 4-dinitrophenyl hydrazine (DNPH- γ-alumina) can be used as an efficient adsorbent material for the adsorption of anionic dyes from aqueous solutions.
 nanoparticle and SD ... ', 'data/ecc/coversheet/41617346624.jpg'))
)
)