Mühendislik ve Doğa Bilimleri Fakültesi

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Browsing Mühendislik ve Doğa Bilimleri Fakültesi by Author "Akceylan, Ezgi"

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    Removal of Some Phenolic Pollutions From Aqueous Solutions by Magnetic Nanoparticles Containing Imidazole-Derivatized Calix[4]arene
    (Konya Technical University, 2021) Akceylan, Ezgi; Erdemir, Serkan; Özçelik, Egemen; Tabakci, Begüm
    In this paper, it was aimed to synthesize imidazole-derived calix[4]arenes, immobilize these compounds to [3-(2,3-epoxypropoxy)-propyl]-trimetoxysilane (EPPTMS) modified Fe3O4 nanoparticles and to investigate adsorption properties of the obtained nanoparticles for some phenolic pollutants. For this purpose, firstly, a series of calix[4]arene derivatives (1, 2, 3, 4, 5, 6, 8) were synthesized according to the literature procedures and their structures were verified to synthesize the target compounds. Compound 6 among of these compounds was reacted with imidazole by the Mannich reaction to achieve target 7. On the other hand, calix[4]arene derivative bearing two distal bromo groups 8 was also reacted with imidazole to achive other target compound 9. The structure of both compounds was confirmed by 1H NMR spectroscopy. Thus, two different calix[4]arene derivatives were prepared from both the lower region and the upper region of the calix[4]arene with functional imidazole groups. These compounds were then immobilized to the EPPTMS modified Fe3O4 nanoparticle to obtain calix[4] arene-bonded new magnetic nanoparticles (C-7-BMN and C-9-BMN) bearing the imidazole group. These new nanoparticles were used as adsorbents in the adsorption of phenol (PHE), p-chlorophenol (pCF) and p-nitrophenol (pNP) from the aqueous solution. Concentrations of solution were determined by HPLC and adsorption results were calculated. The results revealed that C-9-BMN performed the highest adsorption for pCF at pH 6, while C-7-BMN showed no remarkable adsorption for any phenolic species. It has been understood that electrostatic interactions and hydrogen bond interactions are particularly important in the adsorption process and they are closely related to the structure of the adsorbent species depending on the ambient conditions. As a result, using the C-9-BMN adsorbent prepared in this study, the adsorption method, pCF, which is a toxic phenolic species, was removed from the aqueous solutions in a remarkable efficiency.