Anion exchange kinetics of nanodimensional layered metal hydroxides: use of isoconversional analysis. J Phys Chem A 2010 Dec 16;114(49):12858-69
Date
11/18/2010Pubmed ID
21080715DOI
10.1021/jp107429fScopus ID
2-s2.0-78650109883 (requires institutional sign-in at Scopus site) 13 CitationsAbstract
Anion exchange reactions of nanodimensional layered metal hydroxide compounds are utilized to create materials with targeted physical and chemical properties and also as a means for controlled release of intercalated anions. The kinetics of this important class of reaction are generally characterized by model-based approaches. In this work, a different approach based on isothermal, isoconversional analysis was utilized to determine effective activation energies with respect to extent of reaction. Two different layered metal hydroxide materials were chosen for reaction with chloride anions, using a temperature range of 30-60 °C. The concentrations of anions released into solution and the changes in polycrystalline solid phases were evaluated using model-based (Avrami-Erofe'ev nucleation-growth model) and model-free (integral isoconversional) methods. The results demonstrate the utility of the isoconversional approach for identifying when fitting to a single model is not appropriate, particularly for characterizing the temperature dependence of the reaction kinetics.
Author List
Majoni S, Hossenlopp JMAuthor
Jeanne M. Hossenlopp in the Chemistry department at Marquette UniversityMESH terms used to index this publication - Major topics in bold
AnionsCopper
Hydroxides
Kinetics
Metal Nanoparticles
Particle Size
Temperature
Zinc
