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Adsorption of phenolic compounds onto calix[4]arene-bonded silica gels from aqueous solutions
(ELSEVIER SCIENCE BV, 2018) Dolaksiz, Yasemin Ekin; Temel, Farabi; Tabakci, Mustafa
This article describes the preparation of calix[4]arene-bonded silica gels (C [4] BS and DMC [4] BS), and their application to the removal of some selected phenolic compounds such as phenol (PHE), p-chlorophenol (PCP), m-nitrophenol (MNP) and p-nitrophenol (PNP) from aqueous solutions by adsorption method. In initial adsorption experiments appeared that C [4] BS was much more effective in adsorption of PNP rather than PHE, PCP and MNP, whereas DMC [4] BS exhibited too little adsorption ability towards all phenols. Herein, it was concluded that the hydrogen bonding capacities of both phenols and calix[4]arene based adsorbents played a predominant role in the interactions between adsorbate and adsorbent within the adsorption mechanism. Thus, in subsequent studies, the C [4] BS was employed as an adsorbent in the adsorption of PNP, and adsorption conditions were optimized. Furthermore, isotherm and kinetic studies were performed to clarify the phenomena of PNP adsorption onto C [4] BS.