Abstract
We have compared the microwave-hydrothermal (M-H) processing with conventional hydrothermal (C-H) processing in the preparation of two layered anion exchangers, i.e., Mg3Al(OH)8NO3 · nH2O and Ni1-xZn2x(OH)2(CH3COO)2x · nH2O. Both these phases can be crystallized more rapidly (an order of magnitude) under M-H processing compared to C-H processing. The above layered mixed basic salt of Ni and Zn was found to exhibit very high selectivity for PO4= (Kd = 15,000). Its order of selectivity for various anions in the presence of 0.1 N NaC1 (ratio of C1- to anion in question is 100) increases as follows: PO4= ≫ SO4 = > NO3-.
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Komarneni, S., Li, Q.H. & Roy, R. Microwave-hydrothermal processing of layered anion exchangers. Journal of Materials Research 11, 1866–1869 (1996). https://doi.org/10.1557/JMR.1996.0236
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DOI: https://doi.org/10.1557/JMR.1996.0236