Browsing by Author "Boyraz, Evren"
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- ItemA Review on Membrane Technology and Chemical Surface Modification for the Oily Wastewater Treatment(MDPI, 2020-03-11) Yalcinkaya, Fatma; Boyraz, Evren; Maryška, Jiří; Kučerová, KláraCleaning of wastewater for the environment is an emerging issue for the living organism. The separation of oily wastewater, especially emulsified mixtures, is quite challenged due to a large amount of wastewater produced in daily life. In this review, the membrane technology for oily wastewater treatment is presented. In the first part, the global membrane market, the oil spill accidents and their results are discussed. In the second and third parts, the source of oily wastewater and conventional treatment methods are represented. Among all methods, membrane technology is considered the most efficient method in terms of high separation performance and easy to operation process. In the fourth part, we provide an overview of membrane technology, fouling problem, and how to improve the self-cleaning surface using functional groups for effectively treating oily wastewater. The recent development of surface-modified membranes for oily wastewater separation is investigated. It is believed that this review will promote understanding of membrane technology and the development of surface modification strategies for anti-fouling membranes.
- ItemPreparation of Nanofibrous Membranes for Oil/ Water SeparationBoyraz, Evren; Yalcinkaya Fatma, MSc. Ph.D. : 66770Kvůli zvýšenému povědomí o životním prostředí a přísným předpisům je nutné aplikovat nové metody separace olejů z průmyslových odpadních vod, mořských, oceánských vod a ropných směsí. V této práci je prezentována komplexní studie o separaci olejové odpadní vody nanovlákennou membránou včetně povrchové úpravy. Výzkumný vývoj, separace olejové odpadní vody, zlepšení pevnosti membrány, výkonnost propustnosti, samočisticí vlastnosti a membránové vlastnosti jsou také diskutovány.
- ItemSurface-modified nanofibrous PVDF membranes for liquid separation technology(2019) Boyraz, Evren; Yalcinkaya, Fatma; Hrůza, Jakub; Maryška, JiříPreparing easily scaledup, cost-effective, andrecyclablemembranes for separation technology is challenging. In the present study, a unique and newtype ofmodified polyvinylidene fluoride (PVDF) nanofibrous membrane was prepared for the separation of oil-water emulsions. Surface modification was done in two steps. In the first step, dehydrofluorination of PVDF membranes was done using an alkaline solution. After the first step, oil removal and permeability of themembraneswere dramatically improved. In the second step, TiO2 nanoparticles were grafted onto the surface of the membranes. After adding TiO2 nanoparticles, membranes exhibited outstanding anti-fouling and self-cleaning performance. The as-prepared membranes can be of great use in new green separation technology and have great potential to deal with the separation of oil-water emulsions in the near future.