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RISS 인기검색어
- 검색키워드
- 저자 : Soodabeh Khalili (검색결과 4 건)
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Selective CO2 adsorption using N-rich porous carbon derived from KOH-activated polyaniline
Soodabeh Khalili,Mohsen Jahanshahi 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.4
The adsorption of pure gases of carbon dioxide, methane and nitrogen was examined on nitrogen-doped porous carbon (NDC) prepared from polyaniline (PANI) as precursor by chemical activation with KOH (T=650o, IR=2, t=1 h) to determine the potential for the separation of CO2 gas from flue gas or natural gas. Adsorption equilibrium of all gases was determined in a temperature range of 298-318 K and pressure up to 14 bar. Results demonstrated an excellent CO2 adsorption capacity of 3.09mmol·g-1 owing to high CO2 interaction affinity with NDC surface compared to CH4 (1.43mmol·g-1) and N2 (0.64mmol·g-1) under ambient condition (298 K and 1 bar). The ideal adsorbed solution theory (IAST) was used to determine the adsorption selectivity of NDC for CO2/CH4 and CO2/N2 mixtures at different compositions. The NDC had CO2/CH4 (4.42 and 4.08 for CO2/CH4=10/90 and 50/50, respectively) and CO2/ N2 (12.81 and 12.08 for CO2/N2=15/85 and 50/50, respectively) IAST selectivity at temperature of 298 K and pressure of 1bar. The moderate CO2 adsorption enthalpy indicates that N-doped activated carbon is a promising material in gas separation such as natural gas and flue gas processing.
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Sublayer assisted by hydrophilic and hydrophobic ZnO nanoparticles toward engineered osmosis process
Sina Mansouri,Soodabeh Khalili,Majid Peyravi,Mohsen Jahanshahi,Rezvaneh Ramezani Darabi,Fatemeh Ardeshiri,Ali Shokuhi Rad 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.11
Hydrophilic and hydrophobic polyethersulfone (PES)-zinc oxide (ZnO) sublayers were prepared by loading of ZnO nanoparticles into PES matrix. Both porosity and hydrophilicity of the hydrophilic sublayer were increased upon addition of hydrophilic ZnO, while these were decreased for the hydrophobic sublayer. In addition, the results demonstrated that the hydrophilic membrane exhibited smaller structural parameter (S value or S parameter or S), which is beneficial for improving pure water permeability and decreasing mass transfer resistance. In contrast, a higher S parameter was obtained for the hydrophobic membrane. With a 2M NaCl as DS and DI water as FS, the pure water flux of hydrophilic TFN0.5 membrane was increased from 21.02L/m2 h to 30.06L/m2 h and decreased for hydrophobic TFN0.5 membrane to 14.98L/m2 h, while the salt flux of hydrophilic membrane increased from 10.12g/m2 h to 17.31g/m2 h and decreased for hydrophobic TFN0.5 membrane to 3.12g/m2 h. The increment in pure water permeability can be ascribed to reduction in S parameter, which resulted in reduced internal concentration polarization (ICP). The current study provides a feasible and low cost procedure to decrease the ICP in FO processes.
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Behnam Khoshandam,Soodabeh Khalili,Mohsen Jahanshahi 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.10
Adsorption of pure carbon dioxide and methane was examined on activated carbon prepared from pine cone by chemical activation with H3PO4 to determine the potential for the separation of CO2 from CH4. The prepared adsorbent was characterized by N2 adsorption-desorption, elemental analysis, FTIR, SEM and TEM. The equilibrium adsorption of CO2 and CH4 on AC was determined at 298, 308 and 318 K and pressure range of 1-16 bar. The experimental data of both gases were analyzed using Langmuir and Freundlich models. For CO2, the Langmuir isotherm presented a perfect fit, whereas the isotherm of CH4 was well described by Freundlich model. The selectivity of CO2 over CH4 by AC (CO2 : CH4=50 : 50, 298K, 5 bar), predicted by ideal adsorbed solution theory (IAST) model, was achieved at 1.68. These data demonstrated that pine cone-based AC prepared in this study can be successfully used in separation of CO2 from CH4.
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Maryam Darzipour,Mohsen Jahanshahi,Majid Peyravi,Soodabeh Khalili 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.12
Novel antibacterial dynamic membranes loaded by cephalexin/amine functionalized SBA_15 were fabricated for heavy metal removal from aqueous solution. The mesoporous CPX/NH2-SBA_15 nanocomposite was formed as a uniform adsorptive and hydrophilic layer on the ultrafiltration polymeric membrane (PVDF). The modified adsorbent and membranes were characterized by SEM, XRD, N2 adsorption-desorption analysis, FT-IR, TGA, DSC and contact angle. A number of qualitative (well diffusion, disk diffusion) antibacterial assays were conducted against grampositive S. aureus and gram-negative E. coli. In addition, to evaluate its anti-biofouling performance, the model concentrated bacteria suspension in liquid medium was used as a feed solution. 100% bacteria mortality for certain concentration and suitable inhibition zones up to 3.5cm were attained. An increment in the flux recovery from 55% (for UF) to 87% (for self-forming dynamic membrane (DM)) and 91% (for pre-coated DM) indicated that the dynamic layer improved the anti-biofouling property of the support membrane. High Pb(II) removal efficiency (99.8%) was achieved for the modified membrane during dynamic filtration test. CPX/NH2/SBA-15 dynamic membrane showed higher Pb2+ rejection than SBA-15 dynamic membrane because of amine groups located on the adsorbent surface. In general, membranes provide good performance like better flux and rejection besides antibacterial and anti-biofouling behavior.
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