Journal
APPLIED CLAY SCIENCE
Volume 38, Issue 3-4, Pages 179-186Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2007.03.004
Keywords
hydrotalcite; substitution; topotactic exchange; XRD
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In the context of producing industrial-grade hydrotalcite-like (HT) materials containing phosphate and sulfate for use as slow-release fertilizers, the ease with which nitrate-HT can be converted to phosphate-HT and sulfate-HT has been examined. Graded amounts of di-ammonium hydrogen phosphate and ammonium sulfate were added to nitrate-HT, while maintaining pH at 9.5, to produce substitutions ranging from approximately 50% to 100%. Chemical and X-ray diffraction analysis of the products confirmed that the substitution could be easily effected by simple topotactic exchange. (C) 2007 Elsevier B.V. All rights reserved.
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