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Reduction of perchlorate using zero-valent titanium (ZVT) anode: kinetic models
Chunwoo Lee1, Bill Batchelor, Sung Hyuk Park
1Doosan Hydro Technology, Inc., 912 Chad Lane, Tampa, FL 33619, USA. clee@doosanhydro.com
Journal of Colloid and Interface Science
|August 11, 2012
Summary
This study models perchlorate reduction by zero-valent titanium (ZVT) during electrical pitting corrosion. Chloride adsorption influences kinetics, with removal rates directly proportional to applied current.
Area of Science:
- Environmental Science
- Materials Science
- Electrochemistry
Background:
- Perchlorate contamination poses environmental risks.
- Zero-valent titanium (ZVT) shows promise for perchlorate remediation.
- Electrical pitting corrosion influences ZVT reactivity.
Purpose of the Study:
- To model the kinetics of perchlorate reduction by ZVT under electrical pitting corrosion.
- To investigate the role of chloride inhibition mechanisms.
- To compare two distinct kinetic models for perchlorate removal.
Main Methods:
- Development of two kinetic models: competitive adsorption and Ti(II) consumption.
- Analysis of perchlorate and chloride concentrations in solution.
- Evaluation of model predictions against experimental data.
Main Results:
- Both models accurately predicted perchlorate concentration changes.
- Chloride exhibits higher adsorption affinity, inhibiting perchlorate reduction.
- Perchlorate removal and chloride oxidation rates are directly proportional to applied current.
Conclusions:
- The competitive adsorption model provides a robust framework for understanding perchlorate reduction kinetics.
- The Ti(II) consumption model requires further refinement for accurate chloride prediction.
- Applied current is a critical factor influencing the efficiency of ZVT-based perchlorate remediation.
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