Yazar "Tabakci, Mustafa" seçeneğine göre listele

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    High-Performance Adsorption of 4-Nitrophenol onto Calix[6]arene-Tethered Silica from Aqueous Solutions
    (Springer, 2020) Dogan, Murat; Temel, Farabi; Tabakci, Mustafa
    The polymeric calix[6]arene-tethered silica (C[6]TS) was prepared by the tethering of p-tert-butylcalix[6]arene onto 3-glycidoxypropyl-bonded stationary phase. The structural and composition analysis of the C[6]TS was performed by FTIR, XRD, TGA, and SEM techniques. C[6]TS was used as an adsorbent for the removal of 4-nitrophenol (4-NP) from aqueous solutions. Initial adsorption experiments demonstrated that C[6]TS showed outstanding performance for the removal of 4-NP. So it exhibited rapid and effective adsorption with a %83 yield within ten minutes. Subsequently, some adsorption criteria such as pH, initial concentration, contact time, sorbent dosage, and temperature were evaluated in detail. Thus, adsorption phenomena of 4-NP onto C[6]TS were clarified in this way.
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    Removal of lindane from an aqueous solution by using aminopropyl silica gel-immobilized calix[6]arene
    (Elsevier Science Bv, 2013) Tor, Ali; Aydin, Mehmet Emin; Aydin, Senar; Tabakci, Mustafa; Beduk, Fatma
    An aminopropyl silica gel-immobilized calix[6]arene (C[6]APS) has been used for the removal of lindane from an aqueous solution in batch sorption technique. The C[6]APS was synthesized with p-tert-butylcalix[6]arene hexacarboxylate derivative and aminopropyl silica gel in the presence of N,N'-diisopropyl carbodiimide coupling reagent. The sorption study was carried out as functions of solution pH, contact time, initial lindane concentration, C[6]APS dosage and ionic strength of solution. The matrix effect of natural water samples on the sorption efficiency of C[6]APS was also investigated. Maximum lindane removal was obtained at a wide pH range of 2-8 and sorption equilibrium was achieved in 2 h. The isotherm analysis indicated that the sorption data can be represented by both Langmuir and Freundlich isotherm models. Increasing ionic strength of the solutions increased the sorption efficiency and matrix of natural water samples had no effect on the sorption of lindane. By using multilinear regression model, regression equation was also developed to explain the effects of the experimental variables. (C) 2013 Elsevier B.V. All rights reserved.