Time-dependent iodate and iodide adsorption to Fe oxides
- BATTELLE (PACIFIC NW LAB)
Aqueous iodine removal via adsorption to Fe oxides could provide an efficient remedial pathway for vadose zone and groundwater contamination. We conducted a series of macroscopic batch experiments to determine the extent of the time-dependent iodate (IO3-) and iodide (I-) adsorption to four Fe oxides (i.e., ferrihydrite, goethite, magnetite and hematite) at different pH values and solution ionic strengths (IS). The results showed that IO3- adsorption extent [in terms of the average distribution coefficient (Kd) after 2 days of reacting time] followed the order: ferrihydrite (927.5 mL/g) > goethite (84.9 mL/g) > magnetite (23.8 mL/g) > hematite (9.5 mL/g). However, the range of specific surface area (SSA) normalized Kd values was narrow (2 - 4.6 mL/m2), suggesting SSA control over the adsorption extent. The adsorption extent correlated negatively with both pH and IS, implying IO3- outer-sphere adsorption. The adsorption extent increased with time (~27-48%) after 200 days, likely because of interparticle diffusion within aggregates. I- adsorption was insignificant for all Fe oxides. Because of its large SSA, ferrihydrite could be efficient at removing aqueous iodate, potentially decreasing the time of groundwater plume spreading.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1608798
- Report Number(s):
- PNNL-SA-142955
- Journal Information:
- ACS Earth and Space Chemistry, Journal Name: ACS Earth and Space Chemistry Journal Issue: 11 Vol. 3
- Country of Publication:
- United States
- Language:
- English
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