Person: YALÇIN, BAHATTİN
Loading...
Email Address
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
YALÇIN
First Name
BAHATTİN
Name
8 results
Search Results
Now showing 1 - 8 of 8
Publication Open Access Preliminary assessment of microfibers amount in textile wastewater(2022-05-20) AKYILDIZ, SİNEM HAZAL; YALÇIN, BAHATTİN; Akyildiz S. H. , Yalçın Eniş I., Sezgin H., Yalçin B.Textile wastewater is a complex mixture of inorganic compounds, polymers, organic products, dyes, and microfibers (MFs), including microplastics (MPs) and natural fibers. The treatment of textile wastewater, which contains a significant share of MFs, is of great importance to prevent the release of MPs in the environment. MPs analysis requires multiple phases of pretreatment (to eliminate the organic compounds), separation of the MFs from the water, and identification of the MPs among the MFs. This work presents the preliminary results of a research aimed at exploring two issues. Firstly, the pretreatment (through Fenton,H2O2, HCl, KOH and NaOH, applied at 25 °C for 5 days and 60 °C for 6 hours) of artificial textile wastewater, evaluating the effect of the different conditions on the MFs and the MPs. Secondly, the separation of MFs from a real textile wastewater sample through different processes (centrifugation, sink-float & filtration, filtration). The results of the pretreatment tests revealed Fenton, HCl, andH2O2at 25 °C for 5 days as the best performing chemicals and conditions. Considering the results of the separation tests, filtration gave back the best removal of the MFs from wastewater compared to centrifugation and sink-float and filtration, which left some MFs in the supernatant/float and in the sediment/sink. In conclusion, these preliminary results may be useful to further explore the detection of MFs and MPs in textile wastewater.Publication Open Access New metallophthalocyanines including benzylphenoxy groups and investigation of their organic-field effect transistor (OFET) features(2022-04-01) ÖZDEMİR, MÜCAHİT; YALÇIN, BAHATTİN; ÖZDEMİR M., ALTINIŞIK S., Koksoy B., Canimkurbey B., KOYUNCU S., Durmus M., Bulut M., YALÇIN B.In this study, metal and metal-free novel phthalocyanines containing peripheral and non-peripheral tetra 2-ben-zylphenoxy groups were synthesized. The compounds were characterized by UV-Vis, FT-IR, H-1 NMR, and MALDI-TOF mass spectrometry as well as elemental analysis. These new phthalocyanines exhibited excellent solubility in most organic solvents, and their redox behavior was investigated in different solvents such as dimethyl sulfoxide (DMSO) and dichloromethane (DCM). The redox behavior of the peripheral and non-peripheral phthalocyanine compounds 1a -c and 2a -c was determined by cyclic voltammetry and in situ spec-troelectrochemistry. According to organic field-effect transistors (OFETs) measurements, the peripheral and non-peripheral phthalocyanine-cobalt complexes which have higher mobility than others were utilized top-gate bottom-contact OFETs fabrication. The output characteristics of the device show that its mobility is approximately 5 x 10(-2) cm(2)/Vs with p-type accumulation.Publication Open Access Detection and analysis of microfibers and microplastics in wastewater from a textile company(2022-10-01) YALÇIN, BAHATTİN; AKYILDIZ, SİNEM HAZAL; Akyildiz S. H. , Yalçın Eniş I., Sezgin H., Yalçin B.Textile wastewater is polluted by inorganic/organic substances, polymers, dyes, and microfibers (MFs), which are microplastics (MPs) and natural fibers. This work is aimed at the preliminary investigation of MFs and MPs in textile industrial wastewater, and at evaluating the removal efficiency of an on-site wastewater treatment plant (WWTP). Ten samples of inflows and outflows of the WWTP of a textile company (applying a physic-chemical process) have been analyzed. Firstly, the samples underwent a pretreatment with 15% hydrogen peroxide at 25◦C for 5 days to remove organic compounds. Secondly, the MFs were recovered from the aqueous phase by pre- screening centrifugation, density separation, and filtration as alternative options. Filtration obtained the best performances, compared to the other recovery processes. Thirdly, the MFs were counted through optical microscopy and the MPs were identified through micro-FTIR. The MFs amount in the inflow samples was in the range of 893–4452 MFs/L. The outflow samples (310–2404 MFs/L) exhibited a 38–65% reduction compared to the inflows, demonstrating that up to 62% of residual MFs can enter the sewer network or the receiving water body. Cotton and wool, and numerous MPs (acrylic, polyester, polypropylene, polyamide, and viscose/rayon) were identified in the inflow and outflow samples (with the only exception of \"dense\" viscose (rayon), not detected in the out- flows, and probably retained by the WWTP with the sludge). This study, even if just preliminary, offers interesting hints for future research on MFs/MPs detection in textile wastewater, and on the performance of a full-scale WWT process for their removal.Publication Open Access The role of electron-donating subunits in cross-linked BODIPY polymer films(2023-01-01) ÖZDEMİR, MÜCAHİT; YALÇIN, BAHATTİN; ÖZDEMİR M., Köksoy B., YALÇIN B., KOYUNCU S.A new method for synthesizing cross-linked 4,4-difluoro-4-bora-3a,4a-diaza-s-indacenes (BODIPYs) using a radical-based thiol-ene click reaction is developed. This method is simple, efficient, and cost-effective, and it produces polymers with unique optical, electrochemical, and surface morphology properties. Significant blue shifts in absorption and photoinduced electron transfer in emissions are observed in the cross-linked BODIPY thin films. Cross-linking also leads to the restriction of conjugation, which results in the breakage of the terminal vinyl group, an increase in the oxidation potential, and a slight upshift in the HOMO position. As a result, the electrochemical band gap is widened from 1.88 to 1.94 eV for polymer bearing N,N-dimethylamino-BODIPY and from 1.97 to 2.02 eV for polymer bearing N,N-diphenylamino-BODIPY moieties. Monomer thin films form planar surfaces due to crystallinity, while amorphous cross-linked BODIPY polymers form more rough surfaces. Additionally, photopatterning on the film surface is successfully performed using different patterned masks. This new method for synthesizing cross-linked BODIPYs has the potential to be used in a variety of applications, including organic electronics, bioimaging, and photocatalysis.Publication Open Access Direct photopatterning of BODIPY-based small Molecules via thiol-ene click chemistry(2022-01-01) ÖZDEMİR, MÜCAHİT; YALÇIN, BAHATTİN; ÖZDEMİR M., ALTINIŞIK S., Ömeroğlu İ., Köksoy B., Durmuş M., YALÇIN B., KOYUNCU S.© 2022 Wiley-VCH GmbH.We demonstrate a BODIPY-based small molecule photopatterned surface by thiol-ene click chemistry at room temperature utilizing only 366 nm UV light. The resulting cross-linked polymer exhibits porous surfaces according to AFM and TEM results. A dramatic blue shift occurred in absorption spectra and the photoluminescence was also intensified as a result of crosslinking. Optical and electrochemical results are compatible with the DFT calculations. The obtained results prove that the photopatterned BODIPY-based material can be easily and inexpensively applied in multilayer optoelectronic devices.Publication Metadata only Separation and identification of microfibers in the wastewaters of textile finishing process(2023-03-16) AKYILDIZ, SİNEM HAZAL; YALÇIN, BAHATTİN; Akyildiz S. H., Yalçın Eniş I., Sezgin H., Yalçin B.Microplastic pollution is a major global issue, with the textile industry responsible for 35% of the microplastics (MPs) released as microfibers (MFs). Due to their small size, MPs can interact with a wide range of organisms and lead to chromosomal mutations that cause obstruction, inflammation, and organ accumulation. This study aims to detect and separate MFs released from the textile finishing machinery, which is used to give a soft touch to fabrics. Before being transferred to the effluent water, the wastewater samples taken from the section were pretreated with 15% H2O2at 25 °C for 5 days, and thenMFs were captured by a filter. Filters with accumulated MFs were observed using a light microscope, and a micro-FTIR was used to detect MFs chemically. The main results showed that acrylic and cotton MFs were detected in wastewater, and wastewater samples from different dates contained0.058 g/L and 0.251 g/LMFs which reveals the seriousness of the MP problem we are facing.Publication Open Access Examining the Importance of Pretreatment to Capture and Analyze Microfibers from Textile Wastewater(2022-09-10) AKYILDIZ, SİNEM HAZAL; YALÇIN, BAHATTİN; Akyildiz S. H., Yalçin B., Yalçın Eniş I., Sezgin H.The textile industry is one of the causes of environmental problems, which have a negative effect on all organisms in the ecosystem. In addition to the textile wastes generated by the textile industry, wet processes (dyeing, rinsing, softening, mechanical/chemical finishing) release inorganic compounds, polymers, organic products, dyes, and microfibers (MFs) into the environment. Microfibers may also accumulate in marine species and be passed to higher trophic levels, including humans, through the food chain. In order to solve this problem, it is first necessary to correctly identify it. These stages are sample pretreatment, microplastic separation, and characterization/quantification. The aim of this research is to assess the significance of sample pretreatment in detecting microfibers in wastewater from various parts of a textile company. For the purpose of observing the effect of organic removal, half of the wastewater from each process was pretreated, while the other half was not. A 6-hour pretreatment at 60 °C with Fenton's reagent was performed. A microscope and FTIR were used to investigate the MFs collected on the filter. In particular, due to the rich amount of organic matter in inflow and outflow wastewater, the lack of pretreatment made the analysis very difficult. Additionally, the FTIR analysis failed to detect some of the distinctive peaks that should have been visible in the materials.Publication Open Access Bioactivity, crystal and molecular structure of vanadyl(III) complex with N-salicyloyl − N’(3,5-ditertbutyl-2-hydroxy)benzylidene hydrazine(2024-07-15) YALÇIN, BAHATTİN; Amrulla Fatullayeva P., Akper Medjidov A., Gennadievna Safronenko M., Nikolaevic Khrustalev V., Huseyn Ismayilov R., Allahverdi Bayramov M., YALÇIN B., Sadeghian N., Taslimi P., TÜZÜN B.N-salicyloyl-N’-(3,5-ditertbutyl-2-hydroxy)benzylidene hydrazine (H3sahz) and its complex with VO(III) have been synthesized. The molecular and crystal structure of the [(VO)2(sahz)2(C2H5O)2(C2H5OH)] complex by X-ray diffraction, as well as IR and electronic spectra, EPR spectrum etc., have been studied. The structure of the investigated VO(III) complex consists of binuclear units in which the monomeric complex molecules are linked to each other through vanadyl oxygen atom. Monomeric complexes differ between themselves in the character of coordination. Both vanadium atoms have a distorted octahedral environment. The biological activity of this compound has been studied. Lastly, the activities of the studied ligand against various enzyme proteins including acetylcholinesterase (AChE), butrylcholinesterase (BChE) and α-glycosidase (α-Gly) enzyme were compared. ChE inhibitory activities of the new complex against α-Gly, AChE and BChE were determined by Tao and Ellman\"s methods. The new complex was shown to have IC50 values of 42.60 µM for BChE, 91.43 µM for AChE, and 196.49 µM for α-glycosidase.