Chemical Engineering / Kimya Mühendisliği
Permanent URI for this collectionhttps://hdl.handle.net/11147/14
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Article Citation - WoS: 31Citation - Scopus: 34Insights Into Engineered Graphitic Carbon Nitride Quantum Dots for Hazardous Contaminants Degradation in Wastewater(Elsevier, 2023) Gören, Ayşegül Yağmur; Recepoğlu, Yaşar Kemal; Vatanpour, Vahid; Yoon, Yeojoon; Khataee, AlirezaIncreased environmental pollution is a critical issue that must be addressed. Photocatalytic, adsorption, and membrane filtration methods are suitable in environmental governance because of their high selectivity, low cost, environment-friendly nature, and excellent treatment efficiency. Graphitic carbon nitride (g-C3N4) quantum dots (QDs) have been considered as photocatalysts, adsorbents, and membrane materials for wastewater treatments, owing to their stability, adsorption capacity, photochemical properties, and low toxicity and cost. This review summarizes g-C3N4 QD synthesis techniques, operating parameters affecting the removal performance in the treatment process, modification effects with other semiconductors, and benefits and drawbacks of g-C3N4 QD-based materials. Furthermore, this review discusses the practical applications of g-C3N4 QDs as adsorbents, photocatalysts, and membrane materials for organic and inorganic contaminant treatments and their value-added product formation potential. Modified g-C3N4 QD-based material adsorbents, photocatalysts, and membranes present potentially applicable effects, such as removal of most waterborne contaminants. Excellent results were obtained for the reduction of methyl orange, bisphenol A, tetracycline, ciprofloxacin, phenol, rhodamine B, E. coli, and Hg. Overall, this paper provides comprehensive background on g-C3N4 QD-based materials and their diverse applications in wastewater treatment, and it presents a foundation for the enhancement of similar unique materials in the future.Article Citation - WoS: 4Citation - Scopus: 4Polymer-Bonded Cdte Quantum Dot-Nitroxide Radical Nanoprobes for Fluorescent Sensors(Springer, 2022) Karabıyık, Merve; Ebil, ÖzgençA novel functional polymer-bonded quantum dots (QDs)-nitroxide radical complex was demonstrated. In the first part of the study, the synthesis of polymer thin films via initiated chemical vapor deposition (iCVD), functionalization of polymer thin films with amine functional groups, and attachment of QDs to polymer surface were demonstrated. Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy together with fluorescence spectroscopy studies revealed that aliphatic primary amine (propylamine) was very effective for the functionalization of iCVD deposited poly(glycidyl methacrylate) (pGMA) and its copolymer with diethylaminoethyl methacrylate (p(GMA-co-DEAEMA)) and also QD attachment to functionalized polymer surface. In the second part of the study, the synthesis and attachment of Quantum Dot-4Amino TEMPO (QD-4AT) nanoprobes to functionalized pGMA thin films and feasibility of using them as fluorescent sensor structures were investigated. It was found that high initial 4AT concentration and long (24 h) interaction times are beneficial for nanoprobe synthesis. Electron paramagnetic resonance (EPR) spectroscopy analysis revealed the existence of covalent bond between QD and 4AT when 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide was used during synthesis. EPR analysis together with fluorescence microscopy investigation confirmed the successful attachment of nanoprobes to polymer surface. Time-depended fluorescence quenching analysis revealed that more than 50% reduction in fluorescence intensity within 15 min demonstrating the potential of polymer bonded QD-4AT nanoprobes in various sensor applications.