TY - JOUR
T1 - Infrared study of the thermal treatment of sepiolite and palygorskite saturated with organic amines
AU - Shuali, Uri
AU - Bram, Lea
AU - Steinberg, Menachem
AU - Yariv, Shmuel
PY - 1989/8/4
Y1 - 1989/8/4
N2 - Butylamine (BA), pyridine (PY) and 2,4,6-trimethylpyridine (TMP) were adsorbed by sepiolite and palygorskite under reflux. The adsorption and the thermal stability of the organo-clay complexes were studied by IR thermospectrometry. In this technique KBr disks of the organo-clay complexes were heated to 100, 200, 300 and 400°C and IR spectra were recorded after each thermal treatment. The spectra proved that the adsorbed amines were located in the channels, replacing part of the zeolitic and bound water. The three amines were hydrogen bonded to the zeolitic water, Associations were also obtained between BA or PY and bound water in sepiolite but not in palygorskite and not with TMP. Small amounts of adsorbed BA and TMP were protonated. During the thermal treatment of the organo-clay, associations were formed between BA or PY and octahedral Mg exposed to the channel. From the thermal study it can be concluded that hydrophobicity of the clays increases and their thermal stability decreases as a result of the adsorption of the organic bases.
AB - Butylamine (BA), pyridine (PY) and 2,4,6-trimethylpyridine (TMP) were adsorbed by sepiolite and palygorskite under reflux. The adsorption and the thermal stability of the organo-clay complexes were studied by IR thermospectrometry. In this technique KBr disks of the organo-clay complexes were heated to 100, 200, 300 and 400°C and IR spectra were recorded after each thermal treatment. The spectra proved that the adsorbed amines were located in the channels, replacing part of the zeolitic and bound water. The three amines were hydrogen bonded to the zeolitic water, Associations were also obtained between BA or PY and bound water in sepiolite but not in palygorskite and not with TMP. Small amounts of adsorbed BA and TMP were protonated. During the thermal treatment of the organo-clay, associations were formed between BA or PY and octahedral Mg exposed to the channel. From the thermal study it can be concluded that hydrophobicity of the clays increases and their thermal stability decreases as a result of the adsorption of the organic bases.
UR - http://www.scopus.com/inward/record.url?scp=0000266347&partnerID=8YFLogxK
U2 - 10.1016/0040-6031(89)85246-3
DO - 10.1016/0040-6031(89)85246-3
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AN - SCOPUS:0000266347
SN - 0040-6031
VL - 148
SP - 445
EP - 456
JO - Thermochimica Acta
JF - Thermochimica Acta
IS - C
ER -