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- 저자 : Leila Roshanfekr Rad (검색결과 2 건)
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Leila Roshanfekr Rad,Mohammad Irani,Roya Barzegar 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
The adsorption of acetaminophen (ATP) and diclofenac (DCF) from aqueous systems was investigated using NaX nanozeolites synthesized by microwave heating method. The synthesized nanoparticles were characterized by powder X-ray diffraction (XRD), scanning electronic microscopy (SEM), Brunauer-Emmet-Teller (BET), X-ray fluorescence (XRF) and dynamic light scattering (DLS) analysis. The effect of sorption parameters including adsorbent dosage, contact time, initial concentration and temperature on the removal of ATP and DCF was studied in a batch system. The kinetic data were analyzed using pseudo-first-order, pseudo-second-order and double-exponential kinetic models. The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models were used to describe the equilibrium data of ATP and DCF. Thermodynamic parameters were determined to evaluate the nature of ATP and DCF sorption by NaX nanozeolites. The results showed that both ATP and DCF sorption processes were endothermic and spontaneous in the studied conditions. The reusability of NaX nanozeolites was also evaluated after four sorptiondesorption cycles. Moreover, this study provides a promising adsorbent with higher efficiency for adsorption of pharmaceutical compounds.
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Sayyed Sadroddin Qavamnia,Leila Roshanfekr Rad,Mohammad Irani 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
In the present study, the doxorubicin-hydroxyapatite (DOX-HAp) has been loaded into the chitosan/PVA/PUsingle layer and core-shell nanofibers. The potential of synthesized nanofibers was evaluated for controlled release of DOXand bone cancer treatment in vitro. The synthesized DOX-HAp nanohybrid was characterized using XRD, SEM, and UV-Visanalysis. The morphology of synthesized nanofibers was examined by SEM and TEM analysis. For single layer nanofibers,some DOX-HAp nanohybrids were observed on the nanofibers surface. The fiber diameter was increased by increasing shellflow rate and no DOX-HAp nanohybrids were detected on the core-shell fibers surface. The DOX encapsulation efficiency ofsingle layer and core-shell layer fibers was higher than 90 %. The initial burst release from single layer fiber at initial hoursand the continuous release of DOX was observed from single layer nanofibers during 7 and 10 days under acidic andphysiological pH. The sustained release of DOX was obtained within 10 and 14 days, 15 and 18 days, 21 and 25 days fromcore-shell fibers with flow rates of 0.3, 0.5 and 0.8 ml/h under acidic and physiological pH. The non-Fickian diffusion andFickian diffusion were achieved from single layer and core-shell nanofibers. The cell attachment and cell death resultsindicated the high potential of DOX loaded-core-shell fibers for bone cancer treatment.
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