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    Fabrication of hydrophobic waste based-microfibers ıncorporated with green synthesized metal oxides for oil/water separation applications
    (Springer Science and Business Media B.V., 2025) Dilber, Abdülkadir; Hussaini, Ali Akbar; Durmaz, Fatih; Ulukus, Deniz; Yıldırım, Murat
    Developing affordable, long-lasting, and effective membranes is essential for the treatment of oily wastewater, which has become a substantial problem. In this study, an affordable and environmentally-friendly hydrophobic microfibers were designed. Polystyrene wastes were recycled into a functional hydrophobic microfiber. ZnO, CuO, and CuO-ZnO nanoparticles were synthesized using pine pollen waste via green approach. Thereafter, green synthesized nanoparticles were incorporated into recycled polystyrene to fabricated an efficient microfiber. Fabricated microfibers were characterized via FT-IR and XRD, SEM and SEM–EDS. Water contact angle of the polystyrene nanofibers were increased from 123.5° to 139.1° by metal oxide incorporation. Separation efficiency of the polystyrene microfiber was also improved by addition of green synthesized CuO to 81.84%. Notably, these environmentally-friendly membrane nanocomposites can be used in water–oil separation applications successfully.
  • Küçük Resim
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    Removal and preconcentration of cobalt ions from aqueous media using ImHA packed column by on-line SPE system
    (Springer International Publishing Ag, 2012) Ayyıldız, H. Filiz; Topkafa, Mustafa; Arslan, Fatma Nur; Durmaz, Fatih; Kücükkolbaşı, Semahat; Tarhan, İsmail; Kara, Hüseyin
    This work assesses the use of immobilized humic acid (ImHA) onto aminopropyl silica (APS) as a sorbent for the removal and preconcentration of trace amounts of cobalt ions by on-line solid phase extraction (SPE) technique in the column system prepared in our laboratory. Different parameters, such as the effect of the pH, concentration, and flow rate, were studied and throughput was observed by a UV detector. All SPE steps were monitored by breakthrough curves used to visualize distribution of cobalt concentration between mobile and solid phase. The solutions collected from stripping steps were analyzed in atomic absorption spectrometer (AAS) and the amount of sorbed ions was calculated. Sorption characteristics were evaluated by using common adsorption isotherms and Scatchard plot analysis. From the obtained results, it was seen that sorption mechanism of cobalt ions were fitted to Langmuir model on a large scale and thought to be localized. Mean free energy (E = 40.82 kJ mol(-1)) calculated from D-R isotherm showed that chemical interactions are more effective than physical interactions. This investigation reveals a new, simple, environmentally friendly, and cost-effective method for removal and preconcentration of cobalt ions from aqueous solutions by a new aminopropyl silica-immobilized humic acid material.