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Immobilization of calix[6]arene bearing carboxylic acid and amide groups on aminopropyl silica gel and its sorption properties for Cr(VI)

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Abstract

An aminopropyl silica gel-immobilized calix[6]arene (C[6]APS) containing both amide and acid moieties was prepared from p-tert-butylcalix[6]arene hexacarboxylate derivative and aminopropyl silica gel in the presence of N,N′-diisopropyl carbodiimide coupling reagent. C[6]APS was used to evaluate the sorption properties of Cr(VI) as a sorbent material. In sorption studies, it was observed that C[6]APS was highly effective at pH 1.5 for Cr(VI). The effect of parameters such as pH, sorbent dosage, contact time, initial Cr(VI) concentration and temperature on Cr(VI) sorption; the sorption isotherms were also studied. Maximum sorption capacity was obtained as 3.1 mg g−1 at pH 1.5 and 25 °C for 1 h and 10.4 mg L−1 initial Cr(VI) concentration. Thermodynamic parameters such as change in free energy, enthalpy, and entropy were also determined. In the isotherm studies, Langmuir and Freundlich isotherm models were applied and it was found that the experimental data confirmed to Freundlich isotherm model, and the batch sorption capacity of C[6]APS was calculated as 37.66 mg g−1.

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Acknowledgements

We thank the Scientific Research Projects Foundation of Selcuk University (SUBAP) for financial support of this work.

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  1. Department of Chemical Engineering, Selçuk University, 42075, Konya, Turkey

    Mustafa Tabakci

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  1. Mustafa Tabakci
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Correspondence to Mustafa Tabakci.

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Tabakci, M. Immobilization of calix[6]arene bearing carboxylic acid and amide groups on aminopropyl silica gel and its sorption properties for Cr(VI). J Incl Phenom Macrocycl Chem 61, 53–60 (2008). https://doi.org/10.1007/s10847-007-9392-2

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  • DOI: https://doi.org/10.1007/s10847-007-9392-2

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