Browsing by Author "Atar N."

Now showing 1 - 3 of 3

Erratum to: Recovery of Cr(VI) by using a novel calix[4]arene polymeric membrane with modified graphene quantum dots (International Journal of Environmental Science and Technology, (2017), 10.1007/s13762-017-1328-9)
(2017-10-01) Onac C.; Kaya A.; Alpoguz H.K.; Yola M.L.; Eriskin S.; Atar N.; Şener I.
The correspondence author in the original article was wrong. The correct correspondence author is Professor Dr. H. Korkmaz Alpoguz.
Recovery of Cr(VI) by using a novel calix[4]arene polymeric membrane with modified graphene quantum dots
(2017-11-01) Onaç C.; Kaya A.; Alpoğuz H.K.; Yola M.L.; Eriskin S.; Atar N.; Şener I.
Abstract: In this report, the recovery of Cr(VI) from chrome plating water by using a novel calix[4]arene-functionalized graphene quantum dots (GQDs) involved polymer inclusion membrane was investigated. The polymeric membrane supported by GQDs was characterized by using Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The SEM and AFM results clearly show that there are much larger visible pores on the membrane surface after modification of polymer inclusion membrane with GQDs and the micropores in the membrane surface were vanished and performed with GQDs after modification of membrane. The transport efficiency of chromium was found to be 97.23% through the modified membrane from 0.1 M HCl as donor phase to pH 5 as an acceptor phase. The system is available for long-term usage. The highly selective and mechanical strength of membrane is developed by adding GQDs. Modified membrane exhibits significant stability and selectivity, and the system is used for the real samples. Graphical Abstract: [Figure not available: see fulltext.].
Superiority of Modified Polymeric Membrane with Nanomaterial on Temperature and Mechanical Stability and Application in Industrial Waste Water
(2020-01-08) Onac C.; Kaya A.; Atar N.; Sener I.; Alpoguz H.K.
In this paper, we investigated the superiotires of carbon-based nanomaterial polymer inclusion membrane (PIM-GO) against to polymer inclusion membrane and removed Cr(VI), a highly toxic element typically used in chromate conversion coating in the plating industry, from the chrome plating water by using a PIM-GO modified with graphene oxide (GO), which strengthens the mechanical structure and permeability of PIMs. We performed experiments to investigate the membrance performance and structural ability ofthe PIM-GO, and lastly compared its performance to that of the PIM. We observed the PIM-GO's high selectivity and recovery (96.83%) in the removal of Cr(VI). GO added to the membrane structure caused a visible increase in the rate constant, permeability and flux.The PIM-GO affords opportunities to work with a wider range of pH levels, changes of which in membrane-based experiments with unmodified PIM shave caused significant decreases in flux and permeability. The ease of use, applicability, high permeability of the PIM-GO at high temperatures afford significant advantages over the unmodified membrane as well. The results of this study can aid the development of next-generation membranes with increased mechanical stability, the resistance to multilayered GO membranes, and the use of the membranes in industrial applications. Moreover, the high transport efficiency of the PIM-GO at temperatures exceeding room temperature is evidence of the improved thermal stability of the PIM-GO. In effect, our findings can inform the production of new membranes with increased mechanical stability, membrane lifetime, and usability in industrial applications.