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Characterization of Nano‐Porous Bentonite (Montmorillonite) Particles using FTIR and BET‐BJH Analyses
Author(s) -
HayatiAshtiani Majid
Publication year - 2011
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201100030
Subject(s) - bet theory , bentonite , montmorillonite , fourier transform infrared spectroscopy , specific surface area , materials science , mineralogy , porosity , clay minerals , chemical engineering , chemistry , adsorption , composite material , organic chemistry , catalysis , engineering
Bentonite clays find wide industrial application and rich in Montmorillonite which is nano‐structured and nano‐porous member of smectite group and the dominant constituent of a bentonite. The mineralogical and physico‐chemical properties of bentonites are studied by some instrumental analyses such as FTIR, and BET‐BJH method. The FTIR analysis is used to compare the purity of various natural montmorillonite samples, namely S1 and S2. FTIR analysis reveals the absorptions due to Al · O · Si bending (where Al is an octahedral cation) at 524 cm –1 , Si · O · Si Bending at 466 cm –1 , and Al · Al · OH Bending at 917 cm –1 and these absorptions in turn indicate the presence of the dominant montmorillonite. This method shows that the natural bentonites contain non‐smectite phases in both samples. BET (Brunauer‐Emmett‐Teller) specific surface area and PSD (Pore Size Distribution) analyses show that the external surface area of sample S2 measured by BET method ( A BET ) (m 2 /g) is higher than that in S1 (17.4 to 14.4 m 2 /g) but S1 is more nano‐porous than S2. At last but not least, the properties of some bentonites are studied through a combination of instrumental analyses namely FTIR, and BET specific surface area and BJH (Barret‐Johner‐Halenda) pore size distribution analyses (BET‐BJH analyses).