Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Benzoxazine-Linked Porous Organic Networks for Effective Iodine Capture(Royal Soc Chemistry, 2025) Canturk, Batu Sercan; Erdogmus, Mustafa; Gecalp, Yasmin; Sahin, Hasan; Buyukcakir, OnurThis study presents, for the first time, the investigation of a benzoxazine-linked porous organic network (BPON) for iodine capture. BPON was synthesized through the Mannich condensation of paraformaldehyde, melamine, and phloroglucinol. The porous structure and heteroatom-rich skeleton of BPON make it a promising adsorbent platform for iodine capture. BPON demonstrated an effective iodine capture capability in the vapour phase (3.32 g g-1) and an impressive uptake capacity in the aqueous phase (2.80 g g-1 capacity, 90.4% removal efficiency in 12 hours). To investigate the effect of curing on iodine capture, BPON was thermally cured to prepare thermally cured benzoxazine-linked porous organic networks (cBPONs) at three different temperatures: 200, 250, and 300 degrees C. cBPONs demonstrated an iodine capture capacity of up to 2.20 g g-1 and 1.67 g g-1 for vapour and aqueous phases, respectively. The iodine capture mechanism of BPON was investigated using various ex situ analyses, including Fourier transform infrared (FT-IR), Raman spectra, and X-ray photoelectron spectra (XPS). Structural analysis and theoretical calculations indicated the formation of a charge-transfer complex upon iodine capture, leading to the generation of polyiodide species. This study demonstrates the potential of BPONs for iodine capture and paves the way for developing new polymeric adsorbents for capturing iodine from air and water.Article Citation - WoS: 1Citation - Scopus: 1Monomer-Engineered Quinone-Based Conjugated Polymers for High-Rate Aqueous Zinc-Ion Batteries(Amer Chemical Soc, 2025) Canakci, Utku Cem; Gecalp, Yasmin; Canturk, Batu Sercan; Erdogmus, Mustafa; Erozen, Yaren Naz; Buyukcakir, OnurConjugated polymers (CPs) with their extended pi-conjugated structures have recently attracted tremendous attention as organic cathodes in aqueous zinc-ion batteries (AZIBs). In this study, two quinone-pyrrole conjugated polymers, QpCP-1 (benzoquinone monomer) and QpCP-2 (anthracenetetrone monomer), were synthesized to investigate the impact of monomer engineering on electrochemical performance, aiming to enhance specific capacity without sacrificing rate performance and cycle life. At 0.1 A g-1, QpCP-1 delivered a higher specific capacity (178 mA h g-1) than QpCP-2 (134 mA h g-1). However, while QpCP-1's capacity declined with increased current density, QpCP-2 demonstrated superior rate capability, retaining 78% of its initial capacity when the current density increased 20-fold (from 0.1 to 2.0 A g-1). This enhanced rate performance is attributed to QpCP-2's extended conjugated structure and increased accessible quinone-rich redox-active sites. Furthermore, QpCP-2 underwent gradual activation, resulting in a 30% increase in specific capacity, and demonstrated remarkable cycling stability over 10,000 cycles at 2.0 A g-1. The charge storage mechanism involving the coinsertion of H+ and Zn2+ was investigated through a series of ex situ characterization techniques. This work provides insights into the potential of CPs in AZIBs by elucidating the impact of monomer engineering and structural influences on electrochemical performance.Article Nitrate Sensing With Molecular Cage Ionophores: a Potentiometric Approach(Royal Soc Chemistry, 2025) Onder, Ahmet; Begar, Ferit; Kibris, Erman; Buyukcakir, Onur; Yildiz, Umit HakanNitrate ions are widespread environmental pollutants in water and soil, posing critical risks to both human health and ecosystems. This study introduces a molecular cage as a novel ionophore for potentiometric nitrate-selective ion-selective electrodes (ISEs) designed for enhanced specificity and sensitivity. Among six synthetic candidates, the electrode incorporating a 1,3,5-tri(p-hydroxyphenyl)benzene-based chlorotriazine pillared cage molecule (CAGE-1) exhibited superior performance, characterized by a linear response in the nitrate concentration range of 1.0 x 10-5 to 1.0 x 10-1 M, with a high coefficient of determination (R2 = 0.9971) and a slope of -53.1 +/- 1.4 mV dec-1. The electrode also achieved a limit of detection of 7.5 x 10-6 M. These findings highlight the potential of molecular cages as ionophores for nitrate sensing in environmental applications.Article Citation - WoS: 15Citation - Scopus: 15Synthesis of Triazole-Linked Porous Cage Polymers: Modulating Cage Size for Tailored Iodine Adsorption(Amer Chemical Soc, 2024) Begar, Ferit; Erdogmus, Mustafa; Gecalp, Yasmin; Canakci, Utku Cem; Buyukcakir, OnurWe present the synthesis of two triazole-linked porous cage polymers (pCAGEs) using two D-3h symmetric shape-persistent organic cages of different sizes as monomers. We observed that expanding the size of the cage monomer resulted in an improved surface area, pore volume, and iodine vapor uptake capacity of up to 4.02 g g(-1) at 75 degrees C under ambient pressure. Also, embedding molecular organic cages into pCAGEs boosted their iodine adsorption performances compared to their discrete molecular counterparts, model compounds (mCAGEs), due to their open pore channels, enabling the efficient diffusion of iodine into the binding sites. The pCAGEs showed promising iodine adsorption efficiencies from a concentrated KI/I-2 aqueous solution with a high iodine uptake capacity of up to 3.35 g g(-1). The iodine uptake capacities of pCAGEs differ in vapor and aqueous solutions, which suggests that tuning the cage size allows us not only to control the textural properties of pCAGEs but also to tailor their iodine adsorption performances in vapor and water. Iodine adsorption mechanisms of pCAGEs were investigated using ex situ structural characterization techniques, revealing strong interactions of adsorbed iodine species with nitrogen-rich groups and phenyl rings of the pCAGEs. Notably, pCAGEs demonstrated remarkable regeneration and reusability, maintaining 86% of their initial adsorption capacities over five adsorption/desorption cycles, highlighting their potential for practical applications. These findings contribute to a fundamental understanding of the structure-property relationship for cage-based polymeric materials and provide insights into the development of high-performance adsorbents for iodine capture.