Akademik Veri Yönetim Sistemi
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, cilt.312, sa.1, ss.56-61, 2008 (SCI-Expanded)
The physicochemical properties of organosmectites prepared with methylammonium (MA(+) : CH3-NH3+) and ethylenediammonium (EDA(2+) : +H3N-(CH2)(2)-NH3+) cations were compared. The content of the MA(+) and EDA(2+) is taken just equivalent to the cation exchange capacity 1.08 eqv kg(-1) of the sodium smectite used. The highly purified sodium smectite (NaS), methylammonium smectite (MAS) and ethylenediammonium smectite (EDAS) were examined by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), differential thermal analysis (DTA) and low temperature N-2 adsorption/desorption (N-2-AD) techniques. The interlayer spacing of the NaS, MAS and EDAS were calculated from XRD data as 0.21, 0.26 and 0.31 mm, respectively. The specific surface area (S) and specific micro-mesopore volume (V) pairs for the NaS, MAS and EDAS extracted from (N-2-AD) data are 61 m(2) g(-1) and 0.11 cm(3) g(-1); 54 m(2) g(-1) and 0.12 cm(3) g(-1) and 177 m(2) g(-1) and 0.19 cm(3) g(-1), respectively. The S and V values do not change considerable by MA(+) intercalation whereas they are tripled and doubled, respectively, by EDA(2+) intercalation. This shows that with EDA(2+) which is large enough to hold the 2:1 layers permanently apart without filling all the interlayer space, a notable number of size-selective micropores were. opened, but it is not the case for the MA(+). (c) 2007 Elsevier B.V. All rights reserved.