Yazar "Emik, Serkan" seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Boric acid-impregnated silk fibroin/gelatin/hyaluronic acid-based films for improving the wound healing process(Wiley, 2021) Özen, Nurten; Özbaş, Zehra; İzbudak, Burçin; Emik, Serkan; Özkahraman, Bengi; Bal Öztürk, AyçaRecently, with the progression in wound dressings, the importance of the biocompatible material with enhanced features for potential applications in the biomedical field has been more developed. Current strategies focus on the acceleration of the wound healing by systematically designed dressing materials. In this study, biocompatible hydrogel films with the combination of silk fibroin, hyaluronic acid and gelatin biopolymers were fabricated. To gain the enhanced wound healing behavior of wound dressings, boric acid (BA) was formulated in various ratios. The prepared hydrogel films were characterized in terms of FTIR, TGA, DSC, and SEM analysis. Following to the swelling and mechanical tests, in vitro biocompatibility and wound healing tests were performed against L929 fibroblast cell line. Results suggest that the presence of 1% (wt/vol) BA in the formulation of silk fibroin/gelatin/hyaluronic acid based hydrogel films is the key in providing such an enhanced mechanical and wound healing feature and may offer an alternative approach for wound healing treatment.Öğe Functionalized 2-(hydroxyethyl) methacrylate (HEMA)-co-acrylamide (AAm) hydrogels: Kinetic and Isotherm Modelling Analysis on the Removal of Cu(II) Ions(Prints Publications Pvt Ltd, 2019) Bal Öztürk, Ayça; Özbaş, Zehra; Özkahraman, Bengi; Emik, SerkanA functionalized hydrogel composed of 2-(hydroxyethyl) methacrylate (HEMA) and acrylamide (AAm) was synthesized by amination and saponification reactions, respectively, and its functionality was examined for the elimination of copper(II) ions. The maximum adsorption capacity for copper(II) ions was 0.617 mmol g(-1) before saponification, whereas it was 1.2225 mmol g(-1) after saponification. The adsorption data was analyzed with pseudo-first-order (r(2) =0.8867), intra-particle diffusion (r(2) =0.9453), Elovich (r(2) =0.9489) and pseudo-second-order(r(2) =0.9999) kinetic models. Based on the adsorption equilibrium experimental data Freundlich(r(2) =0.9964), Langmuir(r(2) =0.998) and Dubinin-Radushkevich (D-R) (r(2) =0.9960) adsorption isotherms provided good fits for all of experimental results. Finally, the datas of kinetic experiments obtained in this study showed the applicability of the functionalized gel for Copper(II) ion removal.Öğe Removal of Cu 2+ and Pb 2+ Ions Using CMC Based Thermoresponsive Nanocomposite Hydrogel(2011) Özkahraman, Bengi; Acar, Işıl; Emik, SerkanIn this study, carboxymethylcellulose (CMC) based thermoresponsive nanocomposite hydrogel was synthesized for the removal of Cu 2+ and Pb 2+ ions from aqueous solutions. To prepare nanocomposite hydrogel, graft copolymerization of N-isopropyl acrylamide (NIPAm) and acrylic acid (AA) onto CMC was carried out in Na-montmorillonite (MMT)/water suspension media and ammonium persulfate (APS) used as initiator. The chemical structures of hydrogels were characterized by Fourier transform infrared (FT-IR) and X-ray diffraction spectroscopy (XRD). Lower critical solution temperature (LCST), pH responsivity, swelling, and deswelling properties of the hydrogels were also examined. In addition competitive and non-competitive removal of Cu 2+ and Pb 2+ studies were carried out. According to heavy metal sorption studies results, removal capacities of nanocomposite hydrogel for both metal ions were found to be higher than those of pure hydrogel. The analyzed adsorption data showed that the adsorption process of Cu 2+ and Pb 2+ could be explained by pseudo-second order kinetic model. Moreover, according to competitive sorption studies, it is found to be that both hydrogels are more selective to Cu 2+ ion rather than Pb 2+. A carboxymethylcellulose-g-poly(NIPAm-co-AA)/MMT hydrogel was synthesized and the potential use as a Cu 2+ and Pb 2+ adsorbent from aqueous solutions was studied. It could be shown that both hydrogels adsorb relatively high amounts of metal ions in 48h and the presence of MMT in the hydrogel nanocomposite causes a slight increase in the sorption capacity compared to the pure hydrogel. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Öğe The removal of Cu(II) and Pb(II) ions from aqueous solutions by temperature-sensitive hydrogels based on N-isopropylacrylamide and itaconic acid(Ios Press, 2021) Özkahraman, Bengi; Yıldırım, Eren; Emik, Serkan; Acar, IşılThis study deals with the potential use of poly(N-isopropylacrylamide-co-itaconic acid) temperature-sensitive hydrogels as an adsorbent for the removal of Cu(II) and Pb(II) ions from aqueous solutions. For this aim, the adsorption properties of hydrogels were examined by adsorption capacities, adsorption isotherm, and adsorption kinetics experiments. To describe the adsorption characteristics of hydrogels, the obtained experimental data were evaluated by Langmuir, Freundlich, Redlich-Peterson, and Dubinin-Radushkevich isotherm models. Adsorption kinetics experiments were carried out not only in single systems but also in binary systems where both ions were at equal initial concentrations for competitive adsorption studies. To predict the behaviors of the competitive and non-competitive adsorption process of ions onto hydrogels, the experimental adsorption data were analyzed by the pseudo-first-order model and the pseudo-second-order model. According to non-competitive ion removal findings, the adsorption capacities followed order Cu(II) > Pb(II) for all hydrogels, and the pseudo-second-order kinetic model explained the adsorption properties of the hydrogels. Competitive ion removal studies showed that all hydrogels were selective to Cu(II) ion. Furthermore, in the case of comparative investigations both of competitive Cu(II) and competitive Pb(II) removal by hydrogels, the metal ion removal capacity of N10 hydrogel was found as a bit higher than that of N7.5 and N5 in 48 h. That is, as the acidic group content increased in the hydrogel network, the adsorption capacity values also increased. In addition, the reusability of temperature-sensitive hydrogels seems possible without regeneration or after regenerating with acid, in case the temperature is increased above the LCST. Furthermore, even if it cannot be reused, these hydrogels that retain metal ions reach very small volumes by shrinking when the LSCT is exceeded, and thus they can be eliminated more easily than other conventional gels due to their small size. As a result, this temperature-sensitive hydrogel may propose as an alternative environmentally friendly adsorbent candidate for can be used for water purification and wastewater treatment.
