Browsing by Author "Öter, Ç."

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Molecularly Imprinted Polymer Synthesis and Selective Solid Phase Extraction Applications for the Detection of Ziram, a Dithiocarbamate Fungicide
(Elsevier B.V., 2021) Öter, Ç.; Zorer, Ö.S.
It is becoming more and more critical to identify and eliminate pesticide residues that are intended to be used in combating agriculture but pose a threat to all living things due to their unconscious use. In this study, a high-performance molecular imprinted material (MIP) was synthesized to remove ziram, a dithiocarbamate fungicide, from its liquid phase. After characterization studies of the printed polymer synthesized by the suspension polymerization process, the re-bonding ability and the suitability of the adsorption process to kinetic and isothermal models were compared with an non-imprinted reference polymer (NIP). Selectivity of MIP adsorbent prepared by imprinting method against template molecule ziram; their adsorption ability against different dithiocarbamate fungicides (maneb, ferbam, and propineb) was determined by testing. Some extraction parameters were optimized to evaluate the extraction performance of MIPs used as adsorbents in the solid-phase extraction column. It has been found that under optimized conditions, the developed MIP-SPE method provides high recovery for ziram. This method was developed; it was determined that MIP-SPE showed higher extraction efficiency against ziram than commercial C18-SPE and non-print polymer solid-phase extraction (NIP-SPE) processes. Thus, the MIP-SPE method has proven to be an environmentally friendly, sensitive, easy-to-work, time-saving, efficient sample pretreatment method that uses less solvent. These findings will provide a fundamentally technical for the removal of the trace hazardous pollutants. © 2021
Preparation of ZnO Nanoparticle Additive Biocomposites and Investigation of Their Heavy Metal Removal Potential
(Gumushane University, 2025) Öter, Ç.; Gök, Ö.
Recently metalnanoparticles embedded in porous biocomposite materials have played an important role in various fields such as catalyst supports, sensors, energy storage and adsorption applications. In this study, biocomposites synthesized with different proportions of starch, clay and polyethylene glycol (starch/clay/PEG20000) were combined with ZnO particles prepared by green synthesis with Malva sylvestris extract. The ZnO-doped biocomposites synthesized for the first time in this study were characterized by FT-IR, XPS, SEM, TGA and BET analyzes. As a result of the characterization processes, it was found that the thermal stability and surface area increased with increasing clay content in the composites. Accordingly, the KPEG-ZnO composite with the highest surface area and porosity was selected as the adsorbent for the removal of Cr(VI) ions from aqueous solutions. Optimal adsorption conditions (t= 45 min, pH= 2.0, C0= 50 mg/L, adsorbent dose= 1.0 g/L) were determined for the adsorption process. It was also found that the pseudo-second order kinetic model for adsorption kinetics and Langmuir's isothermal model for adsorption equilibrium data were more appropriate. The maximum adsorption capacity of Cr (VI) for KPEG-ZnO was found to be 145.8 mg/g. The experimental results showed that the KPEG-ZnO composite is an environmentally friendly, inexpensive and readily available adsorbent for the removal of Cr (VI) ions from aqueous solutions. © 2025, Gumushane University. All rights reserved.