Experimental and theoretical diffusivities of CD and SR in HFO

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:370475

Axe, L ^[1]; Anderson, P ^[2]

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1. New Jersey Institute of Technology, Newark, NJ (United States)
2. Illinois Institute of Technology, Chicago, IL (United States)

Oxides of manganese and especially iron, occurring as a discrete phase or as coatings on other minerals in the subsurface environment, are the most important sorbent surfaces for the majority of inorganic contaminants. The sorption of inorganics by oxide minerals is characterized as a two-step process. The first step is a rapid, reversible reaction between the bulk aqueous phase and external surface sites. The slow, second step is the rate limiting mechanism wherein the contaminant diffuses through small pores along surface sites. Hydrous ferric oxide sorbent properties were evaluated. Batch and semibatch experiments were conducted to evaluate the sorption process. Using site activation theory and assuming a sinusoidal potential field along the pore surface, theoretical surface diffusion coefficients were determined and found to be in good agreement with experimental results. Surface diffusivities ranged from 10{sup -14} to 6 x 10{sup -13} cm{sup 2}/sec.

• OSTI ID: 370475
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
CADMIUM
DIFFUSION
IRON OXIDES
MANGANESE OXIDES
SORPTION
SORPTIVE PROPERTIES
STRONTIUM
SURFACE PROPERTIES