Effect of Aluminum Substitution on the Reactivity and Growth of Goethite and Hematite Nanoparticles

Academic Research Topics in Environmental Measurement and Monitoring
Oral Presentation

Prepared by C. Johnston, Z. Wiethorn, A. Hildebrandt, W. Arnold, L. Penn
University of Minnesota, 207 Pleasant Street SE, Smith 13, Minneapolis, MN, 55455, United States

Contact Information: joh12860@umn.edu; 612-625-3098


Fe(II) in the presence of iron oxide minerals, such as goethite or hematite, can affect the reductive degradation of highly oxidized environmental contaminants. Due to the ubiquitous presence of aluminum in soil, during weathering processes, up to one third and one sixth of the iron content of goethite and hematite, respectively, may be substituted by aluminum. However, the impact of aluminum substitution on the kinetics of reductive degradation has not been well characterized. Here, we quantitatively compare the influence of varying aluminum substitution on the rate of 4-chloronitrobenzene degradation. Concurrently, we focus on the oxidative mineral growth in order to elucidate how reactivity evolves as a function of extent of reaction.