TY - JOUR
T1 - Study of the structural modifications in activated clays by Mössbauer spectroscopy and X-ray diffractometry
AU - Huaypar, Yezeña
AU - Bravo, Jorge
AU - Gutarra, Abel
AU - Gabriel, Erika
PY - 2007/2/1
Y1 - 2007/2/1
N2 - In this work we study the changes induced on the structure of a smectite clay by chemical acid activation with HCl using X-ray diffractometry (XRD) and transmission Mössbauer spectroscopy (TMS) techniques. By XRD we were able to determine the mineralogical composition of the clay samples and measure the changes in the interplanar distance associated to the structural modifications in the clays. We measured a reduction in the interplanar distance and reflection intensity as the acid concentration in the activation process increased. TMS allowed us identify and characterize the structural sites occupied by ferric and ferrous iron cations. In addition, we were able to monitor the effects caused by the chemical acid activation on the valence state of the iron cations that occupy these structural sites in the clay. For the treatment at low acid concentration, keeping time and temperature of activation constant, our results showed a strong effect on the ferrous and ferric iron sites, reducing and increasing their adsorption relative areas respectively.
AB - In this work we study the changes induced on the structure of a smectite clay by chemical acid activation with HCl using X-ray diffractometry (XRD) and transmission Mössbauer spectroscopy (TMS) techniques. By XRD we were able to determine the mineralogical composition of the clay samples and measure the changes in the interplanar distance associated to the structural modifications in the clays. We measured a reduction in the interplanar distance and reflection intensity as the acid concentration in the activation process increased. TMS allowed us identify and characterize the structural sites occupied by ferric and ferrous iron cations. In addition, we were able to monitor the effects caused by the chemical acid activation on the valence state of the iron cations that occupy these structural sites in the clay. For the treatment at low acid concentration, keeping time and temperature of activation constant, our results showed a strong effect on the ferrous and ferric iron sites, reducing and increasing their adsorption relative areas respectively.
KW - Chemical acid activation
KW - Interplanar distance
KW - Smectite
KW - Transmission Mössbauer spectroscopy
KW - X-ray diffractometry
UR - http://www.scopus.com/inward/record.url?scp=45749126017&partnerID=8YFLogxK
U2 - 10.1007/s10751-008-9583-2
DO - 10.1007/s10751-008-9583-2
M3 - Artículo (Contribución a Revista)
AN - SCOPUS:45749126017
SN - 0304-3843
VL - 175
SP - 23
EP - 28
JO - Hyperfine Interactions
JF - Hyperfine Interactions
IS - 1-3
ER -