Browsing by Author "Tabakci, Begum"

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Citation - WoS: 2
Citation - Scopus: 2
Calixarene-Based Functional Fabric for Simultaneously Adsorptive Removal of Anionic and Cationic Dyes
(Amer Chemical Soc, 2025) Ozcelik, Egemen; Tabakci, Begum; Karaman, Mustafa; Tabakci, Mustafa
This study investigated the adsorptive properties of functionalized fabric containing dimethylaminomethyl calix[4]arene (DMAM-Calix) to remove anionic methyl orange (MO) and cationic Rhodamine B (RhB) dyes in aqueous media. Adsorption studies were performed using a filtration system packed with DMAM-Calix-functionalized fabric (DCF). The results revealed that the cationic and anionic structures work compatibly in a binary mixture medium. Hydrogen bonding, pi-pi, cation-pi, n-pi and electrostatic interactions between dye molecules and DMAM-Calix units of DCF were the main factors affecting the adsorption process. Experiments on real wastewater samples of unknown composition confirmed that the approach could successfully remove MO and RhB dyes from real water samples with high efficiency, especially for RhB. Isotherm and kinetic data for MO were mainly represented by the Langmuir model and pseudo-second-order kinetic model, respectively. The adsorption capacities of DCF were found to be about 4.7 mg g-1 for MO and 1.0 mg g-1 for RhB at pH 6.0, which were evaluated as satisfactory considering the first use of a calixarene-derived coated fabric as an adsorbent, the anionic-cationic dye selectivity of DCF, and the low cost and ease of application of the method.
Citation - WoS: 1
Upper-Rim Nitro and Lower-Rim Methoxy Functionalized Calix[4]arene Based Colorimetric Sensor for Detection of 2,4,6-Trinitrophenol
(Konya Teknik Univ, 2024) Ngandu, Clever; Tabakci, Begum; Tabakci, Mustafa
The development of effective sensors capable of detecting 2,4,6-trinitrophenol (TNP), or picric acid, at extremely low levels is a very interesting field of study for prevention of environmental contamination and terrorist threats. Therefore, in this study, a colorimetric sensor ( MNC4 ) based on calix[4]arene containing a chromophore group was prepared for the detection of TNP. The photophysical interaction of MNC4 with target nitroaromatic compounds (NACs) was evaluated using UV-Vis. spectroscopy. The initial MNC4 solution was colorless, but a distinct color change was observed in the case of TNP, indicating a stronger binding affinity with MNC4. Spectral investigations also confirmed the relatively strong complexation between MNC4 and TNP. The limit of detection (LOD) value for TNP was found to be 520 nM, indicating that MNC4 can detect TNP down to the nanomolar level, which is significantly lower than the permissible level (2.2 mu M). The stoichiometric ratio of the complex formed between MNC4 and TNP was determined to be 1:2. The developed sensor enables the colorimetric detection of TNP with the naked eye without the need for any instrumentation, highlighting its potential for real-world applications.