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Preparation and characterization of Cr- and Fe-pillared bentonites by using CrCl3, FeCl3, Cr(acac)3 and Fe(acac)3 as precursors |
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| Authors: | Mürüvvet Yurdako Mehmet Akay Yal&#x;n Tonbul Fatih Ok Kadir Yurdako |
| Affiliation: | aDokuz Eylül University, Faculty of Arts and Sciences, Department of Chemistry, Kaynaklar Kampüsü, 35160 Buca-?zmir, Turkey bDicle University, Faculty of Arts and Sciences, Department of Chemistry, 21280 Diyarbak?r, Turkey |
| Abstract: | Four pillared bentonites (Cr-PILB, Cr(acac)3-PILB, Fe-PILB and Fe(acac)3-PILB were prepared and characterized by X-ray diffraction (XRD), nitrogen sorption measurements and thermogravimetric (TG) analysis. The surface acidities of the samples and their structures were also investigated in the gas phase adsorption data of pyridine by the aid of FT-IR spectroscopic techniques. The XRD data and FT-IR spectra of the samples reflected mainly the structure of bentonite. The nitrogen adsorption–desorption isotherms of the samples were Type II shaped and showed in general mesoporous structures with pore openings of 4 nm. Two steps mass losses were observed in the TGA thermograms of B, Cr-PILB and Fe-PILB, while three steps mass losses were detected in the case of Cr(acac)3-PILB and Fe(acac)3-PILB. IR study by the adsorption of pyridine on the samples showed both Lewis and Brönsted acid sites on their surfaces. |
| Keywords: | Bentonite Pillared bentonite Cr-pillared bentonite Fe-pillared bentonite Surface acidity Cr(acac)3 Fe(acac)3 |
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