Abstract
Natural aluminosilicates have found application as selective ion exchangers for radioactive cations in liquid wastes. Co is a common constituent of liquid radioactive wastes. Two types of zeolites (Y zeolite, and natural mexican erionite), and two types of clays (natural bentonite, and Al-expanded bentonite (Al-B)) were used. First, the zeolites and the natural bentonite were stabilized to their respective Na{sup +} form using 5N NaCl solution. 2Na{sup +}{yields} {sup 60}Co{sup 2+} ion exchange kinetics in zeolites and clays was followed by gamma spectrometry using a NaCl-Co(NO{sub 3}){sub 2} isonormal solution (0.1N) labeled with {sup 60}Co-Co(NO{sub 3}){sub 2} (100 {mu} Ci). Before and after experiments, the structural changes in the cristallinity of aluminosilicates were determined by X-ray diffraction. XRD analyzes show that the crystallinity of the aluminosilicates was not affected by ion exchange. After Co exchange the cell parameters were determined in all samples. The efficiency of zeolites, natual clays and expanded clays to remove cobalt ions from solutions depends on the ion exchange capacity of the material. Results for long contact time, 18 days, show that Co is more effectively removed by Y zeolite ( 4.07 wt %), followed by erionite (3.09 wt %), then bentonite ( 2.36 wt %)
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Citation Formats
Carrera Garcia, L M.
Zeolites and clays behavior in presence of radioactive solutions.; Comportamiento de zeolitas y arcillas en presencia de soluciones radioactivas..
Mexico: N. p.,
1991.
Web.
Carrera Garcia, L M.
Zeolites and clays behavior in presence of radioactive solutions.; Comportamiento de zeolitas y arcillas en presencia de soluciones radioactivas..
Mexico.
Carrera Garcia, L M.
1991.
"Zeolites and clays behavior in presence of radioactive solutions.; Comportamiento de zeolitas y arcillas en presencia de soluciones radioactivas."
Mexico.
@misc{etde_10115946,
title = {Zeolites and clays behavior in presence of radioactive solutions.; Comportamiento de zeolitas y arcillas en presencia de soluciones radioactivas.}
author = {Carrera Garcia, L M}
abstractNote = {Natural aluminosilicates have found application as selective ion exchangers for radioactive cations in liquid wastes. Co is a common constituent of liquid radioactive wastes. Two types of zeolites (Y zeolite, and natural mexican erionite), and two types of clays (natural bentonite, and Al-expanded bentonite (Al-B)) were used. First, the zeolites and the natural bentonite were stabilized to their respective Na{sup +} form using 5N NaCl solution. 2Na{sup +}{yields} {sup 60}Co{sup 2+} ion exchange kinetics in zeolites and clays was followed by gamma spectrometry using a NaCl-Co(NO{sub 3}){sub 2} isonormal solution (0.1N) labeled with {sup 60}Co-Co(NO{sub 3}){sub 2} (100 {mu} Ci). Before and after experiments, the structural changes in the cristallinity of aluminosilicates were determined by X-ray diffraction. XRD analyzes show that the crystallinity of the aluminosilicates was not affected by ion exchange. After Co exchange the cell parameters were determined in all samples. The efficiency of zeolites, natual clays and expanded clays to remove cobalt ions from solutions depends on the ion exchange capacity of the material. Results for long contact time, 18 days, show that Co is more effectively removed by Y zeolite ( 4.07 wt %), followed by erionite (3.09 wt %), then bentonite ( 2.36 wt %) and finally expanded bentonite ( 0.70 wt %). In Y zeolite an unusual fast soportion uptake of 4.51 % wt Co was observed followed by a desorption process to 4.07 %. This effect is due to the different hydration degree of zeolites during the contact time between the zeolite and the {sup 60}Co solution. In erionite the exchange is lower than in Y-zeolite, first because the Si/Al ratio is higher for erionite than for Y-zeolite and second because K ions in erionite cannot be exchanged during the stabilization of erionite in 5N NaCl solution. (Abstract Truncated)}
place = {Mexico}
year = {1991}
month = {Dec}
}
title = {Zeolites and clays behavior in presence of radioactive solutions.; Comportamiento de zeolitas y arcillas en presencia de soluciones radioactivas.}
author = {Carrera Garcia, L M}
abstractNote = {Natural aluminosilicates have found application as selective ion exchangers for radioactive cations in liquid wastes. Co is a common constituent of liquid radioactive wastes. Two types of zeolites (Y zeolite, and natural mexican erionite), and two types of clays (natural bentonite, and Al-expanded bentonite (Al-B)) were used. First, the zeolites and the natural bentonite were stabilized to their respective Na{sup +} form using 5N NaCl solution. 2Na{sup +}{yields} {sup 60}Co{sup 2+} ion exchange kinetics in zeolites and clays was followed by gamma spectrometry using a NaCl-Co(NO{sub 3}){sub 2} isonormal solution (0.1N) labeled with {sup 60}Co-Co(NO{sub 3}){sub 2} (100 {mu} Ci). Before and after experiments, the structural changes in the cristallinity of aluminosilicates were determined by X-ray diffraction. XRD analyzes show that the crystallinity of the aluminosilicates was not affected by ion exchange. After Co exchange the cell parameters were determined in all samples. The efficiency of zeolites, natual clays and expanded clays to remove cobalt ions from solutions depends on the ion exchange capacity of the material. Results for long contact time, 18 days, show that Co is more effectively removed by Y zeolite ( 4.07 wt %), followed by erionite (3.09 wt %), then bentonite ( 2.36 wt %) and finally expanded bentonite ( 0.70 wt %). In Y zeolite an unusual fast soportion uptake of 4.51 % wt Co was observed followed by a desorption process to 4.07 %. This effect is due to the different hydration degree of zeolites during the contact time between the zeolite and the {sup 60}Co solution. In erionite the exchange is lower than in Y-zeolite, first because the Si/Al ratio is higher for erionite than for Y-zeolite and second because K ions in erionite cannot be exchanged during the stabilization of erionite in 5N NaCl solution. (Abstract Truncated)}
place = {Mexico}
year = {1991}
month = {Dec}
}