期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 79, 期 1-3, 页码 171-175出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2004.10.040
关键词
ion exchange; perlite; analcime; heavy metals; selectivity; thermodynamic parameters
This work studied the ion exchange of Cu2+, Ni2+ Pb2+ and Zn2+ into an analcime (ANA) in the temperature range 298-333 K. The analcime was produced from an economically available Thai perlite. The selectivity sequence for ions entering analcime in its as-synthesized sodium form was Pb2+ > Cu2+ > Zn2+ > Ni2+, as indicated by values of Delta G(0). The results demonstrated that the enthalpy of cation hydration determined the selectivity of the zeolite. Delta S-0 values were related to changes in water content. A comparison of the selectivity series for Pb, Cu, Ni, and Zn cation uptake into analcime to those of other zeolites shows similar trends. (c) 2004 Elsevier Inc. All rights reserved.
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