Structural Characterization of Aniline-Bentonite Composite by FTIR, DTA/TG, and PXRD Analyses and BET Measurement

ABSTRACT

The aniline species incorporated into the acid-activated bentonite matrices leads to the decay of the skeletal stretches centered at 1041 cm⁻¹ and the rise of new features in the phenyl ring frequency region, 1700–1400 cm⁻¹, demonstrates clearly the influence of the acid activation on the Lewis sites necessary for coordination of aniline to bentonite. The exothermic DTA features at 507, 684, and 725°C indicate the release of both the clusters and the decomposed fragments of the aniline-clay composite, and the highly stable carbonaceous residue, respectively. The basal difference by ∼1.0 nm and the much smaller surface area (33.8 m²/g) than that of the nonintercalated bentonite (129.2 m²/g) prove the presence of the tilted aniline species between the interlamellar grooves of the bentonite framework.

KEYWORDS:

• anline species
• bentonite
• intercalation
• surface properties
• thermal analysis

ACKNOWLEDGMENTS

The authors are grateful to the Research Foundation of Ondokuz Mayis University for the financial support of this work under Project F238. We also thank Professor Ugur Cevik of Karadeniz Technical University for performing the chemical analysis of the activated clay sample.