Zn2+-exchange kinetics and antimicrobial properties of synthetic zirconium umbite (K2ZrSi3O9·H2O)
作者： Nichola J. Coleman , Samantha P. Lewis , Andrew P. Mendham , Vivek Trivedi
DOI: 10.1007/S10934-009-9346-8
关键词: Hydrolysis 、 Catalysis 、 Zinc 、 Microporous material 、 Zirconium 、 Ion exchange 、 Chemistry 、 Kinetics 、 Inorganic chemistry 、 Antimicrobial
摘要: Zirconium umbite, K2ZrSi3O9·H2O, is a microporous framework ion exchanger whose potential as carrier for Zn2+ ions in antimicrobial formulations has not yet been investigated. Accordingly, batch Zn2+-exchange kinetics of synthetic zirconium umbite (K-UM) and the subsequent action zinc-bearing phase (Zn-UM) against Staphylococcus aureus Escherichia coli are reported. Nonstoicheiometric over-exchange K+ was observed attributed to hydrolysis complexation reactions within framework. The exchange process, which described by simple pseudo-first-order model (k 1 = 2.69 × 10−4 min−1, R 2 = 0.992), did achieve equilibrium 120 h at 25 °C, time uptake zinc found be 1.04 mmol g−1. minimal bactericidal concentrations Zn-UM E. S. were >10 g cm3 <1.0 g cm3, respectively.
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